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crypto/xts.c
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/* XTS: as defined in IEEE1619/D16 * http://grouper.ieee.org/groups/1619/email/pdf00086.pdf * (sector sizes which are not a multiple of 16 bytes are, * however currently unsupported) * * Copyright (c) 2007 Rik Snel <rsnel@cube.dyndns.org> * |
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* Based on ecb.c |
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. */ |
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#include <crypto/internal/skcipher.h> #include <crypto/scatterwalk.h> |
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#include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/scatterlist.h> #include <linux/slab.h> |
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#include <crypto/xts.h> |
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#include <crypto/b128ops.h> #include <crypto/gf128mul.h> |
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#define XTS_BUFFER_SIZE 128u |
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struct priv { |
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struct crypto_skcipher *child; |
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struct crypto_cipher *tweak; }; |
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struct xts_instance_ctx { struct crypto_skcipher_spawn spawn; char name[CRYPTO_MAX_ALG_NAME]; }; struct rctx { |
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le128 buf[XTS_BUFFER_SIZE / sizeof(le128)]; |
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le128 t; |
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le128 *ext; |
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struct scatterlist srcbuf[2]; struct scatterlist dstbuf[2]; struct scatterlist *src; struct scatterlist *dst; unsigned int left; struct skcipher_request subreq; }; static int setkey(struct crypto_skcipher *parent, const u8 *key, |
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unsigned int keylen) { |
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struct priv *ctx = crypto_skcipher_ctx(parent); struct crypto_skcipher *child; struct crypto_cipher *tweak; |
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int err; |
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err = xts_verify_key(parent, key, keylen); |
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if (err) return err; |
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|
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keylen /= 2; |
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/* we need two cipher instances: one to compute the initial 'tweak' |
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* by encrypting the IV (usually the 'plain' iv) and the other * one to encrypt and decrypt the data */ /* tweak cipher, uses Key2 i.e. the second half of *key */ |
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tweak = ctx->tweak; crypto_cipher_clear_flags(tweak, CRYPTO_TFM_REQ_MASK); crypto_cipher_set_flags(tweak, crypto_skcipher_get_flags(parent) & |
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CRYPTO_TFM_REQ_MASK); |
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err = crypto_cipher_setkey(tweak, key + keylen, keylen); crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(tweak) & CRYPTO_TFM_RES_MASK); |
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if (err) return err; |
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/* data cipher, uses Key1 i.e. the first half of *key */ |
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child = ctx->child; |
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crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) & CRYPTO_TFM_REQ_MASK); err = crypto_skcipher_setkey(child, key, keylen); crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) & CRYPTO_TFM_RES_MASK); |
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return err; } |
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static int post_crypt(struct skcipher_request *req) { struct rctx *rctx = skcipher_request_ctx(req); |
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le128 *buf = rctx->ext ?: rctx->buf; |
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struct skcipher_request *subreq; const int bs = XTS_BLOCK_SIZE; struct skcipher_walk w; struct scatterlist *sg; unsigned offset; int err; |
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subreq = &rctx->subreq; err = skcipher_walk_virt(&w, subreq, false); |
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while (w.nbytes) { unsigned int avail = w.nbytes; |
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le128 *wdst; |
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wdst = w.dst.virt.addr; do { |
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le128_xor(wdst, buf++, wdst); |
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wdst++; } while ((avail -= bs) >= bs); err = skcipher_walk_done(&w, avail); } rctx->left -= subreq->cryptlen; if (err || !rctx->left) goto out; rctx->dst = rctx->dstbuf; scatterwalk_done(&w.out, 0, 1); sg = w.out.sg; offset = w.out.offset; if (rctx->dst != sg) { rctx->dst[0] = *sg; sg_unmark_end(rctx->dst); scatterwalk_crypto_chain(rctx->dst, sg_next(sg), 0, 2); } rctx->dst[0].length -= offset - sg->offset; rctx->dst[0].offset = offset; out: return err; |
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} |
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static int pre_crypt(struct skcipher_request *req) |
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{ |
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struct rctx *rctx = skcipher_request_ctx(req); |
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le128 *buf = rctx->ext ?: rctx->buf; |
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struct skcipher_request *subreq; |
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const int bs = XTS_BLOCK_SIZE; |
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struct skcipher_walk w; struct scatterlist *sg; unsigned cryptlen; unsigned offset; bool more; int err; |
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subreq = &rctx->subreq; cryptlen = subreq->cryptlen; |
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more = rctx->left > cryptlen; if (!more) cryptlen = rctx->left; |
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skcipher_request_set_crypt(subreq, rctx->src, rctx->dst, cryptlen, NULL); |
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err = skcipher_walk_virt(&w, subreq, false); |
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while (w.nbytes) { unsigned int avail = w.nbytes; |
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le128 *wsrc; le128 *wdst; |
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wsrc = w.src.virt.addr; wdst = w.dst.virt.addr; |
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do { *buf++ = rctx->t; |
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le128_xor(wdst++, &rctx->t, wsrc++); |
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gf128mul_x_ble(&rctx->t, &rctx->t); |
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} while ((avail -= bs) >= bs); |
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err = skcipher_walk_done(&w, avail); } skcipher_request_set_crypt(subreq, rctx->dst, rctx->dst, cryptlen, NULL); |
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if (err || !more) goto out; |
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rctx->src = rctx->srcbuf; scatterwalk_done(&w.in, 0, 1); sg = w.in.sg; offset = w.in.offset; if (rctx->src != sg) { rctx->src[0] = *sg; sg_unmark_end(rctx->src); scatterwalk_crypto_chain(rctx->src, sg_next(sg), 0, 2); |
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} |
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rctx->src[0].length -= offset - sg->offset; rctx->src[0].offset = offset; |
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out: |
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return err; } |
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static int init_crypt(struct skcipher_request *req, crypto_completion_t done) |
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{ |
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struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); struct rctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq; gfp_t gfp; subreq = &rctx->subreq; skcipher_request_set_tfm(subreq, ctx->child); skcipher_request_set_callback(subreq, req->base.flags, done, req); gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL : GFP_ATOMIC; rctx->ext = NULL; subreq->cryptlen = XTS_BUFFER_SIZE; if (req->cryptlen > XTS_BUFFER_SIZE) { |
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unsigned int n = min(req->cryptlen, (unsigned int)PAGE_SIZE); rctx->ext = kmalloc(n, gfp); if (rctx->ext) subreq->cryptlen = n; |
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} rctx->src = req->src; rctx->dst = req->dst; rctx->left = req->cryptlen; |
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/* calculate first value of T */ crypto_cipher_encrypt_one(ctx->tweak, (u8 *)&rctx->t, req->iv); return 0; |
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} |
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static void exit_crypt(struct skcipher_request *req) |
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{ |
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struct rctx *rctx = skcipher_request_ctx(req); rctx->left = 0; |
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if (rctx->ext) kzfree(rctx->ext); } static int do_encrypt(struct skcipher_request *req, int err) { struct rctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq; subreq = &rctx->subreq; while (!err && rctx->left) { err = pre_crypt(req) ?: crypto_skcipher_encrypt(subreq) ?: post_crypt(req); if (err == -EINPROGRESS || (err == -EBUSY && req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) return err; } exit_crypt(req); return err; } static void encrypt_done(struct crypto_async_request *areq, int err) { struct skcipher_request *req = areq->data; struct skcipher_request *subreq; struct rctx *rctx; rctx = skcipher_request_ctx(req); |
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if (err == -EINPROGRESS) { if (rctx->left != req->cryptlen) return; goto out; } |
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subreq = &rctx->subreq; subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG; err = do_encrypt(req, err ?: post_crypt(req)); if (rctx->left) return; |
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skcipher_request_complete(req, err); } static int encrypt(struct skcipher_request *req) { return do_encrypt(req, init_crypt(req, encrypt_done)); } static int do_decrypt(struct skcipher_request *req, int err) { struct rctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq; subreq = &rctx->subreq; while (!err && rctx->left) { err = pre_crypt(req) ?: crypto_skcipher_decrypt(subreq) ?: post_crypt(req); if (err == -EINPROGRESS || (err == -EBUSY && req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) return err; } exit_crypt(req); return err; } static void decrypt_done(struct crypto_async_request *areq, int err) { struct skcipher_request *req = areq->data; struct skcipher_request *subreq; struct rctx *rctx; rctx = skcipher_request_ctx(req); |
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if (err == -EINPROGRESS) { if (rctx->left != req->cryptlen) return; goto out; } |
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subreq = &rctx->subreq; subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG; err = do_decrypt(req, err ?: post_crypt(req)); if (rctx->left) return; |
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out: |
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skcipher_request_complete(req, err); } static int decrypt(struct skcipher_request *req) { return do_decrypt(req, init_crypt(req, decrypt_done)); |
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} |
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int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst, struct scatterlist *ssrc, unsigned int nbytes, struct xts_crypt_req *req) { const unsigned int bsize = XTS_BLOCK_SIZE; const unsigned int max_blks = req->tbuflen / bsize; struct blkcipher_walk walk; unsigned int nblocks; |
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le128 *src, *dst, *t; le128 *t_buf = req->tbuf; |
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int err, i; BUG_ON(max_blks < 1); blkcipher_walk_init(&walk, sdst, ssrc, nbytes); err = blkcipher_walk_virt(desc, &walk); nbytes = walk.nbytes; if (!nbytes) return err; nblocks = min(nbytes / bsize, max_blks); |
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src = (le128 *)walk.src.virt.addr; dst = (le128 *)walk.dst.virt.addr; |
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/* calculate first value of T */ req->tweak_fn(req->tweak_ctx, (u8 *)&t_buf[0], walk.iv); i = 0; goto first; for (;;) { do { for (i = 0; i < nblocks; i++) { gf128mul_x_ble(&t_buf[i], t); first: t = &t_buf[i]; /* PP <- T xor P */ |
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le128_xor(dst + i, t, src + i); |
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} /* CC <- E(Key2,PP) */ req->crypt_fn(req->crypt_ctx, (u8 *)dst, nblocks * bsize); /* C <- T xor CC */ for (i = 0; i < nblocks; i++) |
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le128_xor(dst + i, dst + i, &t_buf[i]); |
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src += nblocks; dst += nblocks; nbytes -= nblocks * bsize; nblocks = min(nbytes / bsize, max_blks); } while (nblocks > 0); |
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*(le128 *)walk.iv = *t; |
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err = blkcipher_walk_done(desc, &walk, nbytes); nbytes = walk.nbytes; if (!nbytes) break; nblocks = min(nbytes / bsize, max_blks); |
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src = (le128 *)walk.src.virt.addr; dst = (le128 *)walk.dst.virt.addr; |
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} return err; } EXPORT_SYMBOL_GPL(xts_crypt); |
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static int init_tfm(struct crypto_skcipher *tfm) |
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{ |
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struct skcipher_instance *inst = skcipher_alg_instance(tfm); struct xts_instance_ctx *ictx = skcipher_instance_ctx(inst); struct priv *ctx = crypto_skcipher_ctx(tfm); struct crypto_skcipher *child; struct crypto_cipher *tweak; |
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child = crypto_spawn_skcipher(&ictx->spawn); if (IS_ERR(child)) return PTR_ERR(child); |
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ctx->child = child; |
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tweak = crypto_alloc_cipher(ictx->name, 0, 0); if (IS_ERR(tweak)) { crypto_free_skcipher(ctx->child); return PTR_ERR(tweak); |
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} |
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ctx->tweak = tweak; crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(child) + sizeof(struct rctx)); |
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return 0; } |
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static void exit_tfm(struct crypto_skcipher *tfm) |
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{ |
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struct priv *ctx = crypto_skcipher_ctx(tfm); crypto_free_skcipher(ctx->child); |
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crypto_free_cipher(ctx->tweak); } |
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static void free(struct skcipher_instance *inst) { crypto_drop_skcipher(skcipher_instance_ctx(inst)); kfree(inst); } static int create(struct crypto_template *tmpl, struct rtattr **tb) |
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{ |
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struct skcipher_instance *inst; struct crypto_attr_type *algt; struct xts_instance_ctx *ctx; struct skcipher_alg *alg; const char *cipher_name; |
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u32 mask; |
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int err; |
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algt = crypto_get_attr_type(tb); if (IS_ERR(algt)) return PTR_ERR(algt); if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) return -EINVAL; cipher_name = crypto_attr_alg_name(tb[1]); if (IS_ERR(cipher_name)) return PTR_ERR(cipher_name); inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) return -ENOMEM; ctx = skcipher_instance_ctx(inst); crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst)); |
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mask = crypto_requires_off(algt->type, algt->mask, CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC); err = crypto_grab_skcipher(&ctx->spawn, cipher_name, 0, mask); |
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if (err == -ENOENT) { err = -ENAMETOOLONG; if (snprintf(ctx->name, CRYPTO_MAX_ALG_NAME, "ecb(%s)", cipher_name) >= CRYPTO_MAX_ALG_NAME) goto err_free_inst; |
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err = crypto_grab_skcipher(&ctx->spawn, ctx->name, 0, mask); |
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} |
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if (err) |
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goto err_free_inst; |
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alg = crypto_skcipher_spawn_alg(&ctx->spawn); |
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err = -EINVAL; if (alg->base.cra_blocksize != XTS_BLOCK_SIZE) goto err_drop_spawn; |
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506 507 |
if (crypto_skcipher_alg_ivsize(alg)) goto err_drop_spawn; |
f19f5111c [CRYPTO] xts: XTS... |
508 |
|
f1c131b45 crypto: xts - Con... |
509 510 511 512 |
err = crypto_inst_setname(skcipher_crypto_instance(inst), "xts", &alg->base); if (err) goto err_drop_spawn; |
f19f5111c [CRYPTO] xts: XTS... |
513 |
|
f1c131b45 crypto: xts - Con... |
514 515 |
err = -EINVAL; cipher_name = alg->base.cra_name; |
f19f5111c [CRYPTO] xts: XTS... |
516 |
|
f1c131b45 crypto: xts - Con... |
517 518 519 520 521 |
/* Alas we screwed up the naming so we have to mangle the * cipher name. */ if (!strncmp(cipher_name, "ecb(", 4)) { unsigned len; |
f19f5111c [CRYPTO] xts: XTS... |
522 |
|
f1c131b45 crypto: xts - Con... |
523 524 525 |
len = strlcpy(ctx->name, cipher_name + 4, sizeof(ctx->name)); if (len < 2 || len >= sizeof(ctx->name)) goto err_drop_spawn; |
f19f5111c [CRYPTO] xts: XTS... |
526 |
|
f1c131b45 crypto: xts - Con... |
527 528 |
if (ctx->name[len - 1] != ')') goto err_drop_spawn; |
f19f5111c [CRYPTO] xts: XTS... |
529 |
|
f1c131b45 crypto: xts - Con... |
530 |
ctx->name[len - 1] = 0; |
f19f5111c [CRYPTO] xts: XTS... |
531 |
|
f1c131b45 crypto: xts - Con... |
532 |
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
5125e4e86 crypto: xts - Fix... |
533 534 535 536 |
"xts(%s)", ctx->name) >= CRYPTO_MAX_ALG_NAME) { err = -ENAMETOOLONG; goto err_drop_spawn; } |
f1c131b45 crypto: xts - Con... |
537 538 |
} else goto err_drop_spawn; |
f19f5111c [CRYPTO] xts: XTS... |
539 |
|
f1c131b45 crypto: xts - Con... |
540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 |
inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = alg->base.cra_priority; inst->alg.base.cra_blocksize = XTS_BLOCK_SIZE; inst->alg.base.cra_alignmask = alg->base.cra_alignmask | (__alignof__(u64) - 1); inst->alg.ivsize = XTS_BLOCK_SIZE; inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) * 2; inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) * 2; inst->alg.base.cra_ctxsize = sizeof(struct priv); inst->alg.init = init_tfm; inst->alg.exit = exit_tfm; inst->alg.setkey = setkey; inst->alg.encrypt = encrypt; inst->alg.decrypt = decrypt; inst->free = free; err = skcipher_register_instance(tmpl, inst); if (err) goto err_drop_spawn; out: return err; err_drop_spawn: crypto_drop_skcipher(&ctx->spawn); err_free_inst: |
f19f5111c [CRYPTO] xts: XTS... |
571 |
kfree(inst); |
f1c131b45 crypto: xts - Con... |
572 |
goto out; |
f19f5111c [CRYPTO] xts: XTS... |
573 574 575 576 |
} static struct crypto_template crypto_tmpl = { .name = "xts", |
f1c131b45 crypto: xts - Con... |
577 |
.create = create, |
f19f5111c [CRYPTO] xts: XTS... |
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 |
.module = THIS_MODULE, }; static int __init crypto_module_init(void) { return crypto_register_template(&crypto_tmpl); } static void __exit crypto_module_exit(void) { crypto_unregister_template(&crypto_tmpl); } module_init(crypto_module_init); module_exit(crypto_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("XTS block cipher mode"); |
4943ba16b crypto: include c... |
596 |
MODULE_ALIAS_CRYPTO("xts"); |