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crypto/gcm.c
36.6 KB
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/* * GCM: Galois/Counter Mode. * * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ |
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#include <crypto/gf128mul.h> |
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#include <crypto/internal/aead.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/scatterwalk.h> |
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#include <crypto/hash.h> #include "internal.h" |
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#include <linux/completion.h> |
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#include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> |
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struct gcm_instance_ctx { |
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struct crypto_skcipher_spawn ctr; |
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struct crypto_ahash_spawn ghash; |
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}; struct crypto_gcm_ctx { struct crypto_ablkcipher *ctr; |
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struct crypto_ahash *ghash; |
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}; |
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struct crypto_rfc4106_ctx { struct crypto_aead *child; u8 nonce[4]; }; |
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struct crypto_rfc4543_instance_ctx { struct crypto_aead_spawn aead; struct crypto_skcipher_spawn null; }; |
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struct crypto_rfc4543_ctx { struct crypto_aead *child; |
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struct crypto_blkcipher *null; |
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u8 nonce[4]; }; struct crypto_rfc4543_req_ctx { u8 auth_tag[16]; |
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u8 assocbuf[32]; |
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struct scatterlist cipher[1]; struct scatterlist payload[2]; struct scatterlist assoc[2]; struct aead_request subreq; }; |
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struct crypto_gcm_ghash_ctx { |
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unsigned int cryptlen; struct scatterlist *src; |
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void (*complete)(struct aead_request *req, int err); |
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}; struct crypto_gcm_req_priv_ctx { u8 auth_tag[16]; |
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u8 iauth_tag[16]; |
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struct scatterlist src[2]; struct scatterlist dst[2]; |
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struct crypto_gcm_ghash_ctx ghash_ctx; union { struct ahash_request ahreq; struct ablkcipher_request abreq; } u; |
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}; |
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struct crypto_gcm_setkey_result { int err; struct completion completion; }; |
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static void *gcm_zeroes; |
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static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( struct aead_request *req) { unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); } |
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static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
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{ |
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struct crypto_gcm_setkey_result *result = req->data; |
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if (err == -EINPROGRESS) return; result->err = err; complete(&result->completion); |
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} static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, unsigned int keylen) { struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); |
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struct crypto_ahash *ghash = ctx->ghash; |
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struct crypto_ablkcipher *ctr = ctx->ctr; |
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struct { be128 hash; u8 iv[8]; struct crypto_gcm_setkey_result result; struct scatterlist sg[1]; struct ablkcipher_request req; } *data; int err; |
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crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & CRYPTO_TFM_REQ_MASK); err = crypto_ablkcipher_setkey(ctr, key, keylen); if (err) |
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return err; |
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crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & CRYPTO_TFM_RES_MASK); |
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data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), GFP_KERNEL); if (!data) return -ENOMEM; init_completion(&data->result.completion); sg_init_one(data->sg, &data->hash, sizeof(data->hash)); ablkcipher_request_set_tfm(&data->req, ctr); ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | CRYPTO_TFM_REQ_MAY_BACKLOG, crypto_gcm_setkey_done, &data->result); ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, sizeof(data->hash), data->iv); err = crypto_ablkcipher_encrypt(&data->req); if (err == -EINPROGRESS || err == -EBUSY) { err = wait_for_completion_interruptible( &data->result.completion); if (!err) err = data->result.err; } |
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if (err) goto out; |
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crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & CRYPTO_TFM_REQ_MASK); err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & CRYPTO_TFM_RES_MASK); |
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out: kfree(data); |
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return err; } |
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static int crypto_gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize) { switch (authsize) { case 4: case 8: case 12: case 13: case 14: case 15: case 16: break; default: return -EINVAL; } return 0; } |
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static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req, struct aead_request *req, unsigned int cryptlen) |
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{ struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
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struct scatterlist *dst; __be32 counter = cpu_to_be32(1); memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); memcpy(req->iv + 12, &counter, 4); sg_init_table(pctx->src, 2); sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); scatterwalk_sg_chain(pctx->src, 2, req->src); dst = pctx->src; if (req->src != req->dst) { sg_init_table(pctx->dst, 2); sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); scatterwalk_sg_chain(pctx->dst, 2, req->dst); dst = pctx->dst; } |
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ablkcipher_request_set_tfm(ablk_req, ctx->ctr); |
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ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, cryptlen + sizeof(pctx->auth_tag), req->iv); |
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} static inline unsigned int gcm_remain(unsigned int len) { len &= 0xfU; return len ? 16 - len : 0; } static void gcm_hash_len_done(struct crypto_async_request *areq, int err); static void gcm_hash_final_done(struct crypto_async_request *areq, int err); |
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static int gcm_hash_update(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx, |
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crypto_completion_t compl, |
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struct scatterlist *src, unsigned int len) { struct ahash_request *ahreq = &pctx->u.ahreq; |
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ahash_request_set_callback(ahreq, aead_request_flags(req), |
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compl, req); |
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ahash_request_set_crypt(ahreq, src, NULL, len); return crypto_ahash_update(ahreq); |
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} |
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static int gcm_hash_remain(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx, unsigned int remain, |
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crypto_completion_t compl) |
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{ |
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struct ahash_request *ahreq = &pctx->u.ahreq; ahash_request_set_callback(ahreq, aead_request_flags(req), |
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compl, req); |
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sg_init_one(pctx->src, gcm_zeroes, remain); ahash_request_set_crypt(ahreq, pctx->src, NULL, remain); return crypto_ahash_update(ahreq); } static int gcm_hash_len(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx) { struct ahash_request *ahreq = &pctx->u.ahreq; struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; u128 lengths; lengths.a = cpu_to_be64(req->assoclen * 8); lengths.b = cpu_to_be64(gctx->cryptlen * 8); memcpy(pctx->iauth_tag, &lengths, 16); sg_init_one(pctx->src, pctx->iauth_tag, 16); ahash_request_set_callback(ahreq, aead_request_flags(req), gcm_hash_len_done, req); ahash_request_set_crypt(ahreq, pctx->src, NULL, sizeof(lengths)); return crypto_ahash_update(ahreq); } static int gcm_hash_final(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx) { struct ahash_request *ahreq = &pctx->u.ahreq; ahash_request_set_callback(ahreq, aead_request_flags(req), gcm_hash_final_done, req); ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0); return crypto_ahash_final(ahreq); } |
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static void __gcm_hash_final_done(struct aead_request *req, int err) |
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{ |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; if (!err) crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); |
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gctx->complete(req, err); |
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} |
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static void gcm_hash_final_done(struct crypto_async_request *areq, int err) |
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{ struct aead_request *req = areq->data; |
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__gcm_hash_final_done(req, err); } static void __gcm_hash_len_done(struct aead_request *req, int err) { |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); if (!err) { err = gcm_hash_final(req, pctx); if (err == -EINPROGRESS || err == -EBUSY) return; } |
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__gcm_hash_final_done(req, err); |
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} |
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static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
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{ struct aead_request *req = areq->data; |
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__gcm_hash_len_done(req, err); } static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err) { |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); if (!err) { err = gcm_hash_len(req, pctx); if (err == -EINPROGRESS || err == -EBUSY) return; } |
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__gcm_hash_len_done(req, err); |
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} |
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static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, int err) |
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{ struct aead_request *req = areq->data; |
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__gcm_hash_crypt_remain_done(req, err); } static void __gcm_hash_crypt_done(struct aead_request *req, int err) { |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; unsigned int remain; if (!err) { remain = gcm_remain(gctx->cryptlen); BUG_ON(!remain); err = gcm_hash_remain(req, pctx, remain, gcm_hash_crypt_remain_done); if (err == -EINPROGRESS || err == -EBUSY) return; } |
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__gcm_hash_crypt_remain_done(req, err); |
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} |
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static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
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{ struct aead_request *req = areq->data; |
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__gcm_hash_crypt_done(req, err); } static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err) { |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
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crypto_completion_t compl; |
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unsigned int remain = 0; if (!err && gctx->cryptlen) { remain = gcm_remain(gctx->cryptlen); |
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compl = remain ? gcm_hash_crypt_done : |
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gcm_hash_crypt_remain_done; |
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err = gcm_hash_update(req, pctx, compl, |
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gctx->src, gctx->cryptlen); if (err == -EINPROGRESS || err == -EBUSY) return; } if (remain) |
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__gcm_hash_crypt_done(req, err); |
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else |
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__gcm_hash_crypt_remain_done(req, err); |
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} |
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static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, int err) |
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{ struct aead_request *req = areq->data; |
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__gcm_hash_assoc_remain_done(req, err); } static void __gcm_hash_assoc_done(struct aead_request *req, int err) { |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); unsigned int remain; if (!err) { remain = gcm_remain(req->assoclen); BUG_ON(!remain); err = gcm_hash_remain(req, pctx, remain, gcm_hash_assoc_remain_done); if (err == -EINPROGRESS || err == -EBUSY) return; } |
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__gcm_hash_assoc_remain_done(req, err); |
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} |
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static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
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{ struct aead_request *req = areq->data; |
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__gcm_hash_assoc_done(req, err); } static void __gcm_hash_init_done(struct aead_request *req, int err) { |
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
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crypto_completion_t compl; |
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unsigned int remain = 0; if (!err && req->assoclen) { remain = gcm_remain(req->assoclen); |
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compl = remain ? gcm_hash_assoc_done : |
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gcm_hash_assoc_remain_done; |
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err = gcm_hash_update(req, pctx, compl, |
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req->assoc, req->assoclen); if (err == -EINPROGRESS || err == -EBUSY) return; } if (remain) |
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__gcm_hash_assoc_done(req, err); |
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__gcm_hash_assoc_remain_done(req, err); } static void gcm_hash_init_done(struct crypto_async_request *areq, int err) { struct aead_request *req = areq->data; __gcm_hash_init_done(req, err); |
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} static int gcm_hash(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx) { struct ahash_request *ahreq = &pctx->u.ahreq; struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm); unsigned int remain; |
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crypto_completion_t compl; |
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int err; ahash_request_set_tfm(ahreq, ctx->ghash); ahash_request_set_callback(ahreq, aead_request_flags(req), gcm_hash_init_done, req); err = crypto_ahash_init(ahreq); if (err) return err; remain = gcm_remain(req->assoclen); |
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compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done; err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen); |
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if (err) return err; if (remain) { err = gcm_hash_remain(req, pctx, remain, gcm_hash_assoc_remain_done); if (err) return err; } remain = gcm_remain(gctx->cryptlen); |
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compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done; err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen); |
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if (err) return err; if (remain) { err = gcm_hash_remain(req, pctx, remain, gcm_hash_crypt_remain_done); if (err) return err; } err = gcm_hash_len(req, pctx); if (err) return err; err = gcm_hash_final(req, pctx); if (err) return err; return 0; } static void gcm_enc_copy_hash(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx) { struct crypto_aead *aead = crypto_aead_reqtfm(req); u8 *auth_tag = pctx->auth_tag; |
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scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen, crypto_aead_authsize(aead), 1); |
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} |
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static void gcm_enc_hash_done(struct aead_request *req, int err) |
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490 |
{ |
9382d97af crypto: gcm - Use... |
491 |
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
6160b2899 [CRYPTO] gcm: Fix... |
492 493 |
if (!err) |
9382d97af crypto: gcm - Use... |
494 |
gcm_enc_copy_hash(req, pctx); |
6160b2899 [CRYPTO] gcm: Fix... |
495 |
|
28db8e3e3 [CRYPTO] gcm: New... |
496 497 |
aead_request_complete(req, err); } |
62c5593ae crypto: gcm - fix... |
498 |
static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97af crypto: gcm - Use... |
499 500 501 502 503 504 505 506 |
{ struct aead_request *req = areq->data; struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); if (!err) { err = gcm_hash(req, pctx); if (err == -EINPROGRESS || err == -EBUSY) return; |
62c5593ae crypto: gcm - fix... |
507 508 509 510 |
else if (!err) { crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); gcm_enc_copy_hash(req, pctx); } |
9382d97af crypto: gcm - Use... |
511 |
} |
62c5593ae crypto: gcm - fix... |
512 |
aead_request_complete(req, err); |
9382d97af crypto: gcm - Use... |
513 |
} |
28db8e3e3 [CRYPTO] gcm: New... |
514 515 |
static int crypto_gcm_encrypt(struct aead_request *req) { |
2589469d7 [CRYPTO] gcm: Fix... |
516 |
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97af crypto: gcm - Use... |
517 518 |
struct ablkcipher_request *abreq = &pctx->u.abreq; struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
84c911523 [CRYPTO] gcm: Add... |
519 520 521 522 |
int err; crypto_gcm_init_crypt(abreq, req, req->cryptlen); ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
9382d97af crypto: gcm - Use... |
523 524 525 526 527 |
gcm_encrypt_done, req); gctx->src = req->dst; gctx->cryptlen = req->cryptlen; gctx->complete = gcm_enc_hash_done; |
28db8e3e3 [CRYPTO] gcm: New... |
528 |
|
84c911523 [CRYPTO] gcm: Add... |
529 |
err = crypto_ablkcipher_encrypt(abreq); |
28db8e3e3 [CRYPTO] gcm: New... |
530 531 |
if (err) return err; |
9382d97af crypto: gcm - Use... |
532 533 534 535 536 537 538 539 |
err = gcm_hash(req, pctx); if (err) return err; crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); gcm_enc_copy_hash(req, pctx); return 0; |
28db8e3e3 [CRYPTO] gcm: New... |
540 |
} |
9382d97af crypto: gcm - Use... |
541 542 |
static int crypto_gcm_verify(struct aead_request *req, struct crypto_gcm_req_priv_ctx *pctx) |
84c911523 [CRYPTO] gcm: Add... |
543 544 |
{ struct crypto_aead *aead = crypto_aead_reqtfm(req); |
84c911523 [CRYPTO] gcm: Add... |
545 546 547 548 |
u8 *auth_tag = pctx->auth_tag; u8 *iauth_tag = pctx->iauth_tag; unsigned int authsize = crypto_aead_authsize(aead); unsigned int cryptlen = req->cryptlen - authsize; |
9382d97af crypto: gcm - Use... |
549 |
crypto_xor(auth_tag, iauth_tag, 16); |
84c911523 [CRYPTO] gcm: Add... |
550 |
scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0); |
6bf37e5aa crypto: crypto_me... |
551 |
return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
84c911523 [CRYPTO] gcm: Add... |
552 |
} |
9382d97af crypto: gcm - Use... |
553 |
static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e3 [CRYPTO] gcm: New... |
554 |
{ |
84c911523 [CRYPTO] gcm: Add... |
555 |
struct aead_request *req = areq->data; |
9382d97af crypto: gcm - Use... |
556 |
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c911523 [CRYPTO] gcm: Add... |
557 558 |
if (!err) |
9382d97af crypto: gcm - Use... |
559 |
err = crypto_gcm_verify(req, pctx); |
84c911523 [CRYPTO] gcm: Add... |
560 561 |
aead_request_complete(req, err); |
28db8e3e3 [CRYPTO] gcm: New... |
562 |
} |
62c5593ae crypto: gcm - fix... |
563 |
static void gcm_dec_hash_done(struct aead_request *req, int err) |
9382d97af crypto: gcm - Use... |
564 |
{ |
9382d97af crypto: gcm - Use... |
565 566 567 568 569 570 571 572 573 574 575 |
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); struct ablkcipher_request *abreq = &pctx->u.abreq; struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; if (!err) { ablkcipher_request_set_callback(abreq, aead_request_flags(req), gcm_decrypt_done, req); crypto_gcm_init_crypt(abreq, req, gctx->cryptlen); err = crypto_ablkcipher_decrypt(abreq); if (err == -EINPROGRESS || err == -EBUSY) return; |
62c5593ae crypto: gcm - fix... |
576 577 |
else if (!err) err = crypto_gcm_verify(req, pctx); |
9382d97af crypto: gcm - Use... |
578 |
} |
62c5593ae crypto: gcm - fix... |
579 |
aead_request_complete(req, err); |
9382d97af crypto: gcm - Use... |
580 |
} |
28db8e3e3 [CRYPTO] gcm: New... |
581 582 |
static int crypto_gcm_decrypt(struct aead_request *req) { |
6160b2899 [CRYPTO] gcm: Fix... |
583 |
struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d7 [CRYPTO] gcm: Fix... |
584 |
struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97af crypto: gcm - Use... |
585 586 |
struct ablkcipher_request *abreq = &pctx->u.abreq; struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b2899 [CRYPTO] gcm: Fix... |
587 |
unsigned int authsize = crypto_aead_authsize(aead); |
9382d97af crypto: gcm - Use... |
588 |
unsigned int cryptlen = req->cryptlen; |
28db8e3e3 [CRYPTO] gcm: New... |
589 |
int err; |
6160b2899 [CRYPTO] gcm: Fix... |
590 |
if (cryptlen < authsize) |
28db8e3e3 [CRYPTO] gcm: New... |
591 |
return -EINVAL; |
6160b2899 [CRYPTO] gcm: Fix... |
592 |
cryptlen -= authsize; |
28db8e3e3 [CRYPTO] gcm: New... |
593 |
|
9382d97af crypto: gcm - Use... |
594 595 596 |
gctx->src = req->src; gctx->cryptlen = cryptlen; gctx->complete = gcm_dec_hash_done; |
28db8e3e3 [CRYPTO] gcm: New... |
597 |
|
9382d97af crypto: gcm - Use... |
598 599 600 |
err = gcm_hash(req, pctx); if (err) return err; |
28db8e3e3 [CRYPTO] gcm: New... |
601 |
|
9382d97af crypto: gcm - Use... |
602 603 604 |
ablkcipher_request_set_callback(abreq, aead_request_flags(req), gcm_decrypt_done, req); crypto_gcm_init_crypt(abreq, req, cryptlen); |
84c911523 [CRYPTO] gcm: Add... |
605 606 607 |
err = crypto_ablkcipher_decrypt(abreq); if (err) return err; |
28db8e3e3 [CRYPTO] gcm: New... |
608 |
|
9382d97af crypto: gcm - Use... |
609 |
return crypto_gcm_verify(req, pctx); |
28db8e3e3 [CRYPTO] gcm: New... |
610 611 612 613 614 615 616 617 |
} static int crypto_gcm_init_tfm(struct crypto_tfm *tfm) { struct crypto_instance *inst = (void *)tfm->__crt_alg; struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst); struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); struct crypto_ablkcipher *ctr; |
9382d97af crypto: gcm - Use... |
618 |
struct crypto_ahash *ghash; |
28db8e3e3 [CRYPTO] gcm: New... |
619 620 |
unsigned long align; int err; |
9382d97af crypto: gcm - Use... |
621 622 623 |
ghash = crypto_spawn_ahash(&ictx->ghash); if (IS_ERR(ghash)) return PTR_ERR(ghash); |
1472e5eba [CRYPTO] gcm: Use... |
624 |
ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e3 [CRYPTO] gcm: New... |
625 626 |
err = PTR_ERR(ctr); if (IS_ERR(ctr)) |
9382d97af crypto: gcm - Use... |
627 |
goto err_free_hash; |
28db8e3e3 [CRYPTO] gcm: New... |
628 629 |
ctx->ctr = ctr; |
9382d97af crypto: gcm - Use... |
630 |
ctx->ghash = ghash; |
28db8e3e3 [CRYPTO] gcm: New... |
631 |
|
2589469d7 [CRYPTO] gcm: Fix... |
632 |
align = crypto_tfm_alg_alignmask(tfm); |
28db8e3e3 [CRYPTO] gcm: New... |
633 |
align &= ~(crypto_tfm_ctx_alignment() - 1); |
7f6813786 [CRYPTO] gcm: Put... |
634 |
tfm->crt_aead.reqsize = align + |
9382d97af crypto: gcm - Use... |
635 636 637 638 639 |
offsetof(struct crypto_gcm_req_priv_ctx, u) + max(sizeof(struct ablkcipher_request) + crypto_ablkcipher_reqsize(ctr), sizeof(struct ahash_request) + crypto_ahash_reqsize(ghash)); |
28db8e3e3 [CRYPTO] gcm: New... |
640 641 |
return 0; |
9382d97af crypto: gcm - Use... |
642 643 644 645 |
err_free_hash: crypto_free_ahash(ghash); return err; |
28db8e3e3 [CRYPTO] gcm: New... |
646 647 648 649 650 |
} static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm) { struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); |
9382d97af crypto: gcm - Use... |
651 |
crypto_free_ahash(ctx->ghash); |
28db8e3e3 [CRYPTO] gcm: New... |
652 653 |
crypto_free_ablkcipher(ctx->ctr); } |
d00aa19b5 [CRYPTO] gcm: All... |
654 655 |
static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb, const char *full_name, |
9382d97af crypto: gcm - Use... |
656 657 |
const char *ctr_name, const char *ghash_name) |
28db8e3e3 [CRYPTO] gcm: New... |
658 |
{ |
d00aa19b5 [CRYPTO] gcm: All... |
659 |
struct crypto_attr_type *algt; |
28db8e3e3 [CRYPTO] gcm: New... |
660 661 |
struct crypto_instance *inst; struct crypto_alg *ctr; |
9382d97af crypto: gcm - Use... |
662 663 |
struct crypto_alg *ghash_alg; struct ahash_alg *ghash_ahash_alg; |
28db8e3e3 [CRYPTO] gcm: New... |
664 665 |
struct gcm_instance_ctx *ctx; int err; |
28db8e3e3 [CRYPTO] gcm: New... |
666 |
|
d00aa19b5 [CRYPTO] gcm: All... |
667 |
algt = crypto_get_attr_type(tb); |
d00aa19b5 [CRYPTO] gcm: All... |
668 |
if (IS_ERR(algt)) |
3e8afe35c crypto: use ERR_CAST |
669 |
return ERR_CAST(algt); |
28db8e3e3 [CRYPTO] gcm: New... |
670 |
|
d00aa19b5 [CRYPTO] gcm: All... |
671 672 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) return ERR_PTR(-EINVAL); |
28db8e3e3 [CRYPTO] gcm: New... |
673 |
|
9382d97af crypto: gcm - Use... |
674 675 676 |
ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, CRYPTO_ALG_TYPE_HASH, CRYPTO_ALG_TYPE_AHASH_MASK); |
9382d97af crypto: gcm - Use... |
677 |
if (IS_ERR(ghash_alg)) |
3e8afe35c crypto: use ERR_CAST |
678 |
return ERR_CAST(ghash_alg); |
9382d97af crypto: gcm - Use... |
679 680 |
err = -ENOMEM; |
1472e5eba [CRYPTO] gcm: Use... |
681 682 |
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) |
9382d97af crypto: gcm - Use... |
683 |
goto out_put_ghash; |
28db8e3e3 [CRYPTO] gcm: New... |
684 |
|
1472e5eba [CRYPTO] gcm: Use... |
685 |
ctx = crypto_instance_ctx(inst); |
9382d97af crypto: gcm - Use... |
686 687 688 689 690 |
ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base); err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg, inst); if (err) goto err_free_inst; |
1472e5eba [CRYPTO] gcm: Use... |
691 692 693 694 695 |
crypto_set_skcipher_spawn(&ctx->ctr, inst); err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, crypto_requires_sync(algt->type, algt->mask)); if (err) |
9382d97af crypto: gcm - Use... |
696 |
goto err_drop_ghash; |
1472e5eba [CRYPTO] gcm: Use... |
697 698 |
ctr = crypto_skcipher_spawn_alg(&ctx->ctr); |
28db8e3e3 [CRYPTO] gcm: New... |
699 |
|
d00aa19b5 [CRYPTO] gcm: All... |
700 |
/* We only support 16-byte blocks. */ |
1472e5eba [CRYPTO] gcm: Use... |
701 |
if (ctr->cra_ablkcipher.ivsize != 16) |
d00aa19b5 [CRYPTO] gcm: All... |
702 703 704 705 706 |
goto out_put_ctr; /* Not a stream cipher? */ err = -EINVAL; if (ctr->cra_blocksize != 1) |
28db8e3e3 [CRYPTO] gcm: New... |
707 |
goto out_put_ctr; |
28db8e3e3 [CRYPTO] gcm: New... |
708 |
err = -ENAMETOOLONG; |
d00aa19b5 [CRYPTO] gcm: All... |
709 |
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
9382d97af crypto: gcm - Use... |
710 711 |
"gcm_base(%s,%s)", ctr->cra_driver_name, ghash_alg->cra_driver_name) >= |
d00aa19b5 [CRYPTO] gcm: All... |
712 |
CRYPTO_MAX_ALG_NAME) |
1472e5eba [CRYPTO] gcm: Use... |
713 |
goto out_put_ctr; |
28db8e3e3 [CRYPTO] gcm: New... |
714 |
|
d00aa19b5 [CRYPTO] gcm: All... |
715 |
memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
1472e5eba [CRYPTO] gcm: Use... |
716 717 |
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; |
28db8e3e3 [CRYPTO] gcm: New... |
718 |
inst->alg.cra_priority = ctr->cra_priority; |
d00aa19b5 [CRYPTO] gcm: All... |
719 |
inst->alg.cra_blocksize = 1; |
2589469d7 [CRYPTO] gcm: Fix... |
720 |
inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1); |
28db8e3e3 [CRYPTO] gcm: New... |
721 |
inst->alg.cra_type = &crypto_aead_type; |
84c911523 [CRYPTO] gcm: Add... |
722 |
inst->alg.cra_aead.ivsize = 16; |
7ba683a6d [CRYPTO] aead: Ma... |
723 |
inst->alg.cra_aead.maxauthsize = 16; |
28db8e3e3 [CRYPTO] gcm: New... |
724 725 726 727 |
inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx); inst->alg.cra_init = crypto_gcm_init_tfm; inst->alg.cra_exit = crypto_gcm_exit_tfm; inst->alg.cra_aead.setkey = crypto_gcm_setkey; |
dadbc53d0 [CRYPTO] gcm: Int... |
728 |
inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize; |
28db8e3e3 [CRYPTO] gcm: New... |
729 730 731 732 |
inst->alg.cra_aead.encrypt = crypto_gcm_encrypt; inst->alg.cra_aead.decrypt = crypto_gcm_decrypt; out: |
9382d97af crypto: gcm - Use... |
733 |
crypto_mod_put(ghash_alg); |
28db8e3e3 [CRYPTO] gcm: New... |
734 |
return inst; |
1472e5eba [CRYPTO] gcm: Use... |
735 736 737 |
out_put_ctr: crypto_drop_skcipher(&ctx->ctr); |
9382d97af crypto: gcm - Use... |
738 739 |
err_drop_ghash: crypto_drop_ahash(&ctx->ghash); |
28db8e3e3 [CRYPTO] gcm: New... |
740 741 |
err_free_inst: kfree(inst); |
9382d97af crypto: gcm - Use... |
742 |
out_put_ghash: |
28db8e3e3 [CRYPTO] gcm: New... |
743 744 745 |
inst = ERR_PTR(err); goto out; } |
d00aa19b5 [CRYPTO] gcm: All... |
746 747 |
static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) { |
d00aa19b5 [CRYPTO] gcm: All... |
748 749 750 751 752 |
const char *cipher_name; char ctr_name[CRYPTO_MAX_ALG_NAME]; char full_name[CRYPTO_MAX_ALG_NAME]; cipher_name = crypto_attr_alg_name(tb[1]); |
d00aa19b5 [CRYPTO] gcm: All... |
753 |
if (IS_ERR(cipher_name)) |
3e8afe35c crypto: use ERR_CAST |
754 |
return ERR_CAST(cipher_name); |
d00aa19b5 [CRYPTO] gcm: All... |
755 756 757 758 759 760 761 762 |
if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) return ERR_PTR(-ENAMETOOLONG); if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) return ERR_PTR(-ENAMETOOLONG); |
9382d97af crypto: gcm - Use... |
763 |
return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash"); |
d00aa19b5 [CRYPTO] gcm: All... |
764 |
} |
28db8e3e3 [CRYPTO] gcm: New... |
765 766 767 |
static void crypto_gcm_free(struct crypto_instance *inst) { struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); |
1472e5eba [CRYPTO] gcm: Use... |
768 |
crypto_drop_skcipher(&ctx->ctr); |
9382d97af crypto: gcm - Use... |
769 |
crypto_drop_ahash(&ctx->ghash); |
28db8e3e3 [CRYPTO] gcm: New... |
770 771 772 773 774 775 776 777 778 |
kfree(inst); } static struct crypto_template crypto_gcm_tmpl = { .name = "gcm", .alloc = crypto_gcm_alloc, .free = crypto_gcm_free, .module = THIS_MODULE, }; |
d00aa19b5 [CRYPTO] gcm: All... |
779 780 |
static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb) { |
d00aa19b5 [CRYPTO] gcm: All... |
781 |
const char *ctr_name; |
9382d97af crypto: gcm - Use... |
782 |
const char *ghash_name; |
d00aa19b5 [CRYPTO] gcm: All... |
783 784 785 |
char full_name[CRYPTO_MAX_ALG_NAME]; ctr_name = crypto_attr_alg_name(tb[1]); |
d00aa19b5 [CRYPTO] gcm: All... |
786 |
if (IS_ERR(ctr_name)) |
3e8afe35c crypto: use ERR_CAST |
787 |
return ERR_CAST(ctr_name); |
d00aa19b5 [CRYPTO] gcm: All... |
788 |
|
9382d97af crypto: gcm - Use... |
789 |
ghash_name = crypto_attr_alg_name(tb[2]); |
9382d97af crypto: gcm - Use... |
790 |
if (IS_ERR(ghash_name)) |
3e8afe35c crypto: use ERR_CAST |
791 |
return ERR_CAST(ghash_name); |
9382d97af crypto: gcm - Use... |
792 793 794 |
if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) |
d00aa19b5 [CRYPTO] gcm: All... |
795 |
return ERR_PTR(-ENAMETOOLONG); |
9382d97af crypto: gcm - Use... |
796 |
return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name); |
d00aa19b5 [CRYPTO] gcm: All... |
797 798 799 800 801 802 803 804 |
} static struct crypto_template crypto_gcm_base_tmpl = { .name = "gcm_base", .alloc = crypto_gcm_base_alloc, .free = crypto_gcm_free, .module = THIS_MODULE, }; |
dadbc53d0 [CRYPTO] gcm: Int... |
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 |
static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, unsigned int keylen) { struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); struct crypto_aead *child = ctx->child; int err; if (keylen < 4) return -EINVAL; keylen -= 4; memcpy(ctx->nonce, key + keylen, 4); crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & CRYPTO_TFM_REQ_MASK); err = crypto_aead_setkey(child, key, keylen); crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & CRYPTO_TFM_RES_MASK); return err; } static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, unsigned int authsize) { struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); switch (authsize) { case 8: case 12: case 16: break; default: return -EINVAL; } return crypto_aead_setauthsize(ctx->child, authsize); } static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) { struct aead_request *subreq = aead_request_ctx(req); struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); struct crypto_aead *child = ctx->child; u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), crypto_aead_alignmask(child) + 1); memcpy(iv, ctx->nonce, 4); memcpy(iv + 4, req->iv, 8); aead_request_set_tfm(subreq, child); aead_request_set_callback(subreq, req->base.flags, req->base.complete, req->base.data); aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); aead_request_set_assoc(subreq, req->assoc, req->assoclen); return subreq; } static int crypto_rfc4106_encrypt(struct aead_request *req) { req = crypto_rfc4106_crypt(req); return crypto_aead_encrypt(req); } static int crypto_rfc4106_decrypt(struct aead_request *req) { req = crypto_rfc4106_crypt(req); return crypto_aead_decrypt(req); } static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm) { struct crypto_instance *inst = (void *)tfm->__crt_alg; struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); struct crypto_aead *aead; unsigned long align; aead = crypto_spawn_aead(spawn); if (IS_ERR(aead)) return PTR_ERR(aead); ctx->child = aead; align = crypto_aead_alignmask(aead); align &= ~(crypto_tfm_ctx_alignment() - 1); tfm->crt_aead.reqsize = sizeof(struct aead_request) + ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + align + 16; return 0; } static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm) { struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); crypto_free_aead(ctx->child); } static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb) { struct crypto_attr_type *algt; struct crypto_instance *inst; struct crypto_aead_spawn *spawn; struct crypto_alg *alg; const char *ccm_name; int err; algt = crypto_get_attr_type(tb); |
dadbc53d0 [CRYPTO] gcm: Int... |
921 |
if (IS_ERR(algt)) |
3e8afe35c crypto: use ERR_CAST |
922 |
return ERR_CAST(algt); |
dadbc53d0 [CRYPTO] gcm: Int... |
923 924 925 926 927 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) return ERR_PTR(-EINVAL); ccm_name = crypto_attr_alg_name(tb[1]); |
dadbc53d0 [CRYPTO] gcm: Int... |
928 |
if (IS_ERR(ccm_name)) |
3e8afe35c crypto: use ERR_CAST |
929 |
return ERR_CAST(ccm_name); |
dadbc53d0 [CRYPTO] gcm: Int... |
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 |
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return ERR_PTR(-ENOMEM); spawn = crypto_instance_ctx(inst); crypto_set_aead_spawn(spawn, inst); err = crypto_grab_aead(spawn, ccm_name, 0, crypto_requires_sync(algt->type, algt->mask)); if (err) goto out_free_inst; alg = crypto_aead_spawn_alg(spawn); err = -EINVAL; /* We only support 16-byte blocks. */ if (alg->cra_aead.ivsize != 16) goto out_drop_alg; /* Not a stream cipher? */ if (alg->cra_blocksize != 1) goto out_drop_alg; err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "rfc4106(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto out_drop_alg; inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; inst->alg.cra_priority = alg->cra_priority; inst->alg.cra_blocksize = 1; inst->alg.cra_alignmask = alg->cra_alignmask; inst->alg.cra_type = &crypto_nivaead_type; inst->alg.cra_aead.ivsize = 8; inst->alg.cra_aead.maxauthsize = 16; inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); inst->alg.cra_init = crypto_rfc4106_init_tfm; inst->alg.cra_exit = crypto_rfc4106_exit_tfm; inst->alg.cra_aead.setkey = crypto_rfc4106_setkey; inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize; inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt; inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt; inst->alg.cra_aead.geniv = "seqiv"; out: return inst; out_drop_alg: crypto_drop_aead(spawn); out_free_inst: kfree(inst); inst = ERR_PTR(err); goto out; } static void crypto_rfc4106_free(struct crypto_instance *inst) { crypto_drop_spawn(crypto_instance_ctx(inst)); kfree(inst); } static struct crypto_template crypto_rfc4106_tmpl = { .name = "rfc4106", .alloc = crypto_rfc4106_alloc, .free = crypto_rfc4106_free, .module = THIS_MODULE, }; |
73c89c15b crypto: gcm - Add... |
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 |
static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx( struct aead_request *req) { unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); } static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, unsigned int keylen) { struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); struct crypto_aead *child = ctx->child; int err; if (keylen < 4) return -EINVAL; keylen -= 4; memcpy(ctx->nonce, key + keylen, 4); crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & CRYPTO_TFM_REQ_MASK); err = crypto_aead_setkey(child, key, keylen); crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & CRYPTO_TFM_RES_MASK); return err; } static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, unsigned int authsize) { struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); if (authsize != 16) return -EINVAL; return crypto_aead_setauthsize(ctx->child, authsize); } |
d733ac90f crypto: gcm - fix... |
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 |
static void crypto_rfc4543_done(struct crypto_async_request *areq, int err) { struct aead_request *req = areq->data; struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req); if (!err) { scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen, crypto_aead_authsize(aead), 1); } aead_request_complete(req, err); } |
73c89c15b crypto: gcm - Add... |
1062 |
static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req, |
9489667d3 crypto: gcm - mak... |
1063 |
bool enc) |
73c89c15b crypto: gcm - Add... |
1064 1065 1066 1067 1068 |
{ struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req); struct aead_request *subreq = &rctx->subreq; |
9489667d3 crypto: gcm - mak... |
1069 |
struct scatterlist *src = req->src; |
73c89c15b crypto: gcm - Add... |
1070 1071 1072 1073 1074 |
struct scatterlist *cipher = rctx->cipher; struct scatterlist *payload = rctx->payload; struct scatterlist *assoc = rctx->assoc; unsigned int authsize = crypto_aead_authsize(aead); unsigned int assoclen = req->assoclen; |
9489667d3 crypto: gcm - mak... |
1075 1076 |
struct page *srcp; u8 *vsrc; |
73c89c15b crypto: gcm - Add... |
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), crypto_aead_alignmask(ctx->child) + 1); memcpy(iv, ctx->nonce, 4); memcpy(iv + 4, req->iv, 8); /* construct cipher/plaintext */ if (enc) memset(rctx->auth_tag, 0, authsize); else |
9489667d3 crypto: gcm - mak... |
1087 |
scatterwalk_map_and_copy(rctx->auth_tag, src, |
73c89c15b crypto: gcm - Add... |
1088 1089 1090 1091 1092 1093 |
req->cryptlen - authsize, authsize, 0); sg_init_one(cipher, rctx->auth_tag, authsize); /* construct the aad */ |
9489667d3 crypto: gcm - mak... |
1094 1095 |
srcp = sg_page(src); vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; |
73c89c15b crypto: gcm - Add... |
1096 1097 1098 |
sg_init_table(payload, 2); sg_set_buf(payload, req->iv, 8); |
9489667d3 crypto: gcm - mak... |
1099 |
scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2); |
73c89c15b crypto: gcm - Add... |
1100 |
assoclen += 8 + req->cryptlen - (enc ? 0 : authsize); |
d3dde5220 crypto: gcm - fix... |
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 |
if (req->assoc->length == req->assoclen) { sg_init_table(assoc, 2); sg_set_page(assoc, sg_page(req->assoc), req->assoc->length, req->assoc->offset); } else { BUG_ON(req->assoclen > sizeof(rctx->assocbuf)); scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0, req->assoclen, 0); sg_init_table(assoc, 2); sg_set_buf(assoc, rctx->assocbuf, req->assoclen); } |
c920fa605 crypto: Use scatt... |
1114 |
scatterwalk_crypto_chain(assoc, payload, 0, 2); |
73c89c15b crypto: gcm - Add... |
1115 1116 |
aead_request_set_tfm(subreq, ctx->child); |
d733ac90f crypto: gcm - fix... |
1117 1118 |
aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done, req); |
73c89c15b crypto: gcm - Add... |
1119 1120 1121 1122 1123 |
aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv); aead_request_set_assoc(subreq, assoc, assoclen); return subreq; } |
9489667d3 crypto: gcm - mak... |
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 |
static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) { struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); unsigned int authsize = crypto_aead_authsize(aead); unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize); struct blkcipher_desc desc = { .tfm = ctx->null, }; return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes); } |
73c89c15b crypto: gcm - Add... |
1136 1137 1138 1139 1140 1141 |
static int crypto_rfc4543_encrypt(struct aead_request *req) { struct crypto_aead *aead = crypto_aead_reqtfm(req); struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req); struct aead_request *subreq; int err; |
9489667d3 crypto: gcm - mak... |
1142 1143 1144 1145 1146 1147 1148 |
if (req->src != req->dst) { err = crypto_rfc4543_copy_src_to_dst(req, true); if (err) return err; } subreq = crypto_rfc4543_crypt(req, true); |
73c89c15b crypto: gcm - Add... |
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 |
err = crypto_aead_encrypt(subreq); if (err) return err; scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen, crypto_aead_authsize(aead), 1); return 0; } static int crypto_rfc4543_decrypt(struct aead_request *req) { |
9489667d3 crypto: gcm - mak... |
1161 1162 1163 1164 1165 1166 1167 1168 1169 |
int err; if (req->src != req->dst) { err = crypto_rfc4543_copy_src_to_dst(req, false); if (err) return err; } req = crypto_rfc4543_crypt(req, false); |
73c89c15b crypto: gcm - Add... |
1170 1171 1172 1173 1174 1175 1176 |
return crypto_aead_decrypt(req); } static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm) { struct crypto_instance *inst = (void *)tfm->__crt_alg; |
9489667d3 crypto: gcm - mak... |
1177 1178 |
struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst); struct crypto_aead_spawn *spawn = &ictx->aead; |
73c89c15b crypto: gcm - Add... |
1179 1180 |
struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm); struct crypto_aead *aead; |
9489667d3 crypto: gcm - mak... |
1181 |
struct crypto_blkcipher *null; |
73c89c15b crypto: gcm - Add... |
1182 |
unsigned long align; |
9489667d3 crypto: gcm - mak... |
1183 |
int err = 0; |
73c89c15b crypto: gcm - Add... |
1184 1185 1186 1187 |
aead = crypto_spawn_aead(spawn); if (IS_ERR(aead)) return PTR_ERR(aead); |
9489667d3 crypto: gcm - mak... |
1188 1189 1190 1191 |
null = crypto_spawn_blkcipher(&ictx->null.base); err = PTR_ERR(null); if (IS_ERR(null)) goto err_free_aead; |
73c89c15b crypto: gcm - Add... |
1192 |
ctx->child = aead; |
9489667d3 crypto: gcm - mak... |
1193 |
ctx->null = null; |
73c89c15b crypto: gcm - Add... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 |
align = crypto_aead_alignmask(aead); align &= ~(crypto_tfm_ctx_alignment() - 1); tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) + ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + align + 16; return 0; |
9489667d3 crypto: gcm - mak... |
1203 1204 1205 1206 |
err_free_aead: crypto_free_aead(aead); return err; |
73c89c15b crypto: gcm - Add... |
1207 1208 1209 1210 1211 1212 1213 |
} static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm) { struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm); crypto_free_aead(ctx->child); |
9489667d3 crypto: gcm - mak... |
1214 |
crypto_free_blkcipher(ctx->null); |
73c89c15b crypto: gcm - Add... |
1215 1216 1217 1218 1219 1220 1221 1222 |
} static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb) { struct crypto_attr_type *algt; struct crypto_instance *inst; struct crypto_aead_spawn *spawn; struct crypto_alg *alg; |
9489667d3 crypto: gcm - mak... |
1223 |
struct crypto_rfc4543_instance_ctx *ctx; |
73c89c15b crypto: gcm - Add... |
1224 1225 1226 1227 |
const char *ccm_name; int err; algt = crypto_get_attr_type(tb); |
73c89c15b crypto: gcm - Add... |
1228 |
if (IS_ERR(algt)) |
3e8afe35c crypto: use ERR_CAST |
1229 |
return ERR_CAST(algt); |
73c89c15b crypto: gcm - Add... |
1230 1231 1232 1233 1234 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) return ERR_PTR(-EINVAL); ccm_name = crypto_attr_alg_name(tb[1]); |
73c89c15b crypto: gcm - Add... |
1235 |
if (IS_ERR(ccm_name)) |
3e8afe35c crypto: use ERR_CAST |
1236 |
return ERR_CAST(ccm_name); |
73c89c15b crypto: gcm - Add... |
1237 |
|
9489667d3 crypto: gcm - mak... |
1238 |
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
73c89c15b crypto: gcm - Add... |
1239 1240 |
if (!inst) return ERR_PTR(-ENOMEM); |
9489667d3 crypto: gcm - mak... |
1241 1242 |
ctx = crypto_instance_ctx(inst); spawn = &ctx->aead; |
73c89c15b crypto: gcm - Add... |
1243 1244 1245 1246 1247 1248 1249 |
crypto_set_aead_spawn(spawn, inst); err = crypto_grab_aead(spawn, ccm_name, 0, crypto_requires_sync(algt->type, algt->mask)); if (err) goto out_free_inst; alg = crypto_aead_spawn_alg(spawn); |
9489667d3 crypto: gcm - mak... |
1250 1251 1252 1253 1254 1255 1256 |
crypto_set_skcipher_spawn(&ctx->null, inst); err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0, CRYPTO_ALG_ASYNC); if (err) goto out_drop_alg; crypto_skcipher_spawn_alg(&ctx->null); |
73c89c15b crypto: gcm - Add... |
1257 1258 1259 1260 |
err = -EINVAL; /* We only support 16-byte blocks. */ if (alg->cra_aead.ivsize != 16) |
9489667d3 crypto: gcm - mak... |
1261 |
goto out_drop_ecbnull; |
73c89c15b crypto: gcm - Add... |
1262 1263 1264 |
/* Not a stream cipher? */ if (alg->cra_blocksize != 1) |
9489667d3 crypto: gcm - mak... |
1265 |
goto out_drop_ecbnull; |
73c89c15b crypto: gcm - Add... |
1266 1267 1268 1269 1270 1271 1272 |
err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "rfc4543(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
9489667d3 crypto: gcm - mak... |
1273 |
goto out_drop_ecbnull; |
73c89c15b crypto: gcm - Add... |
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 |
inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; inst->alg.cra_priority = alg->cra_priority; inst->alg.cra_blocksize = 1; inst->alg.cra_alignmask = alg->cra_alignmask; inst->alg.cra_type = &crypto_nivaead_type; inst->alg.cra_aead.ivsize = 8; inst->alg.cra_aead.maxauthsize = 16; inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); inst->alg.cra_init = crypto_rfc4543_init_tfm; inst->alg.cra_exit = crypto_rfc4543_exit_tfm; inst->alg.cra_aead.setkey = crypto_rfc4543_setkey; inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize; inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt; inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt; inst->alg.cra_aead.geniv = "seqiv"; out: return inst; |
9489667d3 crypto: gcm - mak... |
1299 1300 |
out_drop_ecbnull: crypto_drop_skcipher(&ctx->null); |
73c89c15b crypto: gcm - Add... |
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 |
out_drop_alg: crypto_drop_aead(spawn); out_free_inst: kfree(inst); inst = ERR_PTR(err); goto out; } static void crypto_rfc4543_free(struct crypto_instance *inst) { |
9489667d3 crypto: gcm - mak... |
1311 1312 1313 1314 |
struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst); crypto_drop_aead(&ctx->aead); crypto_drop_skcipher(&ctx->null); |
73c89c15b crypto: gcm - Add... |
1315 1316 1317 1318 1319 1320 1321 1322 1323 |
kfree(inst); } static struct crypto_template crypto_rfc4543_tmpl = { .name = "rfc4543", .alloc = crypto_rfc4543_alloc, .free = crypto_rfc4543_free, .module = THIS_MODULE, }; |
28db8e3e3 [CRYPTO] gcm: New... |
1324 1325 |
static int __init crypto_gcm_module_init(void) { |
d00aa19b5 [CRYPTO] gcm: All... |
1326 |
int err; |
9382d97af crypto: gcm - Use... |
1327 1328 1329 |
gcm_zeroes = kzalloc(16, GFP_KERNEL); if (!gcm_zeroes) return -ENOMEM; |
d00aa19b5 [CRYPTO] gcm: All... |
1330 1331 1332 1333 1334 1335 1336 |
err = crypto_register_template(&crypto_gcm_base_tmpl); if (err) goto out; err = crypto_register_template(&crypto_gcm_tmpl); if (err) goto out_undo_base; |
dadbc53d0 [CRYPTO] gcm: Int... |
1337 1338 1339 |
err = crypto_register_template(&crypto_rfc4106_tmpl); if (err) goto out_undo_gcm; |
73c89c15b crypto: gcm - Add... |
1340 1341 1342 |
err = crypto_register_template(&crypto_rfc4543_tmpl); if (err) goto out_undo_rfc4106; |
9382d97af crypto: gcm - Use... |
1343 |
return 0; |
d00aa19b5 [CRYPTO] gcm: All... |
1344 |
|
73c89c15b crypto: gcm - Add... |
1345 1346 |
out_undo_rfc4106: crypto_unregister_template(&crypto_rfc4106_tmpl); |
dadbc53d0 [CRYPTO] gcm: Int... |
1347 1348 |
out_undo_gcm: crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b5 [CRYPTO] gcm: All... |
1349 1350 |
out_undo_base: crypto_unregister_template(&crypto_gcm_base_tmpl); |
9382d97af crypto: gcm - Use... |
1351 1352 1353 |
out: kfree(gcm_zeroes); return err; |
28db8e3e3 [CRYPTO] gcm: New... |
1354 1355 1356 1357 |
} static void __exit crypto_gcm_module_exit(void) { |
9382d97af crypto: gcm - Use... |
1358 |
kfree(gcm_zeroes); |
73c89c15b crypto: gcm - Add... |
1359 |
crypto_unregister_template(&crypto_rfc4543_tmpl); |
dadbc53d0 [CRYPTO] gcm: Int... |
1360 |
crypto_unregister_template(&crypto_rfc4106_tmpl); |
28db8e3e3 [CRYPTO] gcm: New... |
1361 |
crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b5 [CRYPTO] gcm: All... |
1362 |
crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e3 [CRYPTO] gcm: New... |
1363 1364 1365 1366 1367 1368 1369 1370 |
} module_init(crypto_gcm_module_init); module_exit(crypto_gcm_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Galois/Counter Mode"); MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); |
5d26a105b crypto: prefix mo... |
1371 1372 1373 |
MODULE_ALIAS_CRYPTO("gcm_base"); MODULE_ALIAS_CRYPTO("rfc4106"); MODULE_ALIAS_CRYPTO("rfc4543"); |
4943ba16b crypto: include c... |
1374 |
MODULE_ALIAS_CRYPTO("gcm"); |