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crypto/shash.c
14.5 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Synchronous Cryptographic Hash operations. * * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> |
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*/ |
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#include <crypto/scatterwalk.h> |
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#include <crypto/internal/hash.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/seq_file.h> |
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#include <linux/cryptouser.h> #include <net/netlink.h> |
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#include <linux/compiler.h> |
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#include "internal.h" |
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static const struct crypto_type crypto_shash_type; |
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int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) |
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{ return -ENOSYS; } |
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EXPORT_SYMBOL_GPL(shash_no_setkey); |
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static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); unsigned long absize; u8 *buffer, *alignbuffer; int err; |
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absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
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buffer = kmalloc(absize, GFP_ATOMIC); |
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if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); err = shash->setkey(tfm, alignbuffer, keylen); |
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kzfree(buffer); |
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return err; } |
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static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg) { if (crypto_shash_alg_has_setkey(alg) && !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY)) crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY); } |
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int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); |
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int err; |
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if ((unsigned long)key & alignmask) |
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err = shash_setkey_unaligned(tfm, key, keylen); else err = shash->setkey(tfm, key, keylen); |
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if (unlikely(err)) { shash_set_needkey(tfm, shash); |
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return err; |
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} |
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crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); return 0; |
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} EXPORT_SYMBOL_GPL(crypto_shash_setkey); |
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static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, unsigned int len) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); unsigned int unaligned_len = alignmask + 1 - ((unsigned long)data & alignmask); |
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/* * We cannot count on __aligned() working for large values: * https://patchwork.kernel.org/patch/9507697/ */ u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2]; |
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u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
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int err; |
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if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf))) return -EINVAL; |
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if (unaligned_len > len) unaligned_len = len; |
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memcpy(buf, data, unaligned_len); |
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err = shash->update(desc, buf, unaligned_len); memset(buf, 0, unaligned_len); |
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return err ?: |
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shash->update(desc, data + unaligned_len, len - unaligned_len); } int crypto_shash_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); if ((unsigned long)data & alignmask) return shash_update_unaligned(desc, data, len); return shash->update(desc, data, len); } EXPORT_SYMBOL_GPL(crypto_shash_update); static int shash_final_unaligned(struct shash_desc *desc, u8 *out) { struct crypto_shash *tfm = desc->tfm; unsigned long alignmask = crypto_shash_alignmask(tfm); struct shash_alg *shash = crypto_shash_alg(tfm); unsigned int ds = crypto_shash_digestsize(tfm); |
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/* * We cannot count on __aligned() working for large values: * https://patchwork.kernel.org/patch/9507697/ */ u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE]; |
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u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
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int err; |
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if (WARN_ON(buf + ds > ubuf + sizeof(ubuf))) return -EINVAL; |
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err = shash->final(desc, buf); |
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if (err) goto out; |
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memcpy(out, buf, ds); |
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out: memset(buf, 0, ds); |
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return err; } int crypto_shash_final(struct shash_desc *desc, u8 *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); if ((unsigned long)out & alignmask) return shash_final_unaligned(desc, out); return shash->final(desc, out); } EXPORT_SYMBOL_GPL(crypto_shash_final); static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return crypto_shash_update(desc, data, len) ?: crypto_shash_final(desc, out); } int crypto_shash_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); |
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if (((unsigned long)data | (unsigned long)out) & alignmask) |
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return shash_finup_unaligned(desc, data, len, out); return shash->finup(desc, data, len, out); } EXPORT_SYMBOL_GPL(crypto_shash_finup); static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return crypto_shash_init(desc) ?: |
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crypto_shash_finup(desc, data, len, out); |
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} int crypto_shash_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); |
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if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) return -ENOKEY; |
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if (((unsigned long)data | (unsigned long)out) & alignmask) |
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return shash_digest_unaligned(desc, data, len, out); return shash->digest(desc, data, len, out); } EXPORT_SYMBOL_GPL(crypto_shash_digest); |
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static int shash_default_export(struct shash_desc *desc, void *out) |
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{ |
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memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm)); return 0; |
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} |
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static int shash_default_import(struct shash_desc *desc, const void *in) |
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{ |
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memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm)); return 0; |
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} |
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static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen) { struct crypto_shash **ctx = crypto_ahash_ctx(tfm); return crypto_shash_setkey(*ctx, key, keylen); } static int shash_async_init(struct ahash_request *req) { struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; |
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return crypto_shash_init(desc); } |
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int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) |
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{ |
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struct crypto_hash_walk walk; int nbytes; for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes)) nbytes = crypto_shash_update(desc, walk.data, nbytes); return nbytes; } |
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EXPORT_SYMBOL_GPL(shash_ahash_update); static int shash_async_update(struct ahash_request *req) { return shash_ahash_update(req, ahash_request_ctx(req)); } |
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static int shash_async_final(struct ahash_request *req) { return crypto_shash_final(ahash_request_ctx(req), req->result); } |
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int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) { struct crypto_hash_walk walk; int nbytes; |
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nbytes = crypto_hash_walk_first(req, &walk); if (!nbytes) return crypto_shash_final(desc, req->result); do { |
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nbytes = crypto_hash_walk_last(&walk) ? crypto_shash_finup(desc, walk.data, nbytes, req->result) : crypto_shash_update(desc, walk.data, nbytes); |
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nbytes = crypto_hash_walk_done(&walk, nbytes); } while (nbytes > 0); |
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return nbytes; } EXPORT_SYMBOL_GPL(shash_ahash_finup); static int shash_async_finup(struct ahash_request *req) { struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; |
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return shash_ahash_finup(req, desc); } |
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int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) |
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{ |
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unsigned int nbytes = req->nbytes; |
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struct scatterlist *sg; unsigned int offset; |
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int err; |
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if (nbytes && (sg = req->src, offset = sg->offset, |
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nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) { |
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void *data; |
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data = kmap_atomic(sg_page(sg)); |
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err = crypto_shash_digest(desc, data + offset, nbytes, req->result); |
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kunmap_atomic(data); |
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} else err = crypto_shash_init(desc) ?: |
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shash_ahash_finup(req, desc); |
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return err; } EXPORT_SYMBOL_GPL(shash_ahash_digest); |
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static int shash_async_digest(struct ahash_request *req) { struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); |
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desc->tfm = *ctx; |
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return shash_ahash_digest(req, desc); |
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} |
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static int shash_async_export(struct ahash_request *req, void *out) { return crypto_shash_export(ahash_request_ctx(req), out); } static int shash_async_import(struct ahash_request *req, const void *in) { |
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struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; |
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return crypto_shash_import(desc, in); |
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} |
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static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) { struct crypto_shash **ctx = crypto_tfm_ctx(tfm); crypto_free_shash(*ctx); } |
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int crypto_init_shash_ops_async(struct crypto_tfm *tfm) |
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{ struct crypto_alg *calg = tfm->__crt_alg; |
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struct shash_alg *alg = __crypto_shash_alg(calg); |
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struct crypto_ahash *crt = __crypto_ahash_cast(tfm); |
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm); struct crypto_shash *shash; if (!crypto_mod_get(calg)) return -EAGAIN; |
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shash = crypto_create_tfm(calg, &crypto_shash_type); |
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if (IS_ERR(shash)) { crypto_mod_put(calg); return PTR_ERR(shash); } *ctx = shash; tfm->exit = crypto_exit_shash_ops_async; crt->init = shash_async_init; crt->update = shash_async_update; |
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crt->final = shash_async_final; crt->finup = shash_async_finup; |
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crt->digest = shash_async_digest; |
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if (crypto_shash_alg_has_setkey(alg)) crt->setkey = shash_async_setkey; |
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crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) & CRYPTO_TFM_NEED_KEY); |
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crt->export = shash_async_export; crt->import = shash_async_import; |
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crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); return 0; } |
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static int crypto_shash_init_tfm(struct crypto_tfm *tfm) |
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{ |
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struct crypto_shash *hash = __crypto_shash_cast(tfm); |
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struct shash_alg *alg = crypto_shash_alg(hash); hash->descsize = alg->descsize; |
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shash_set_needkey(hash, alg); |
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return 0; } |
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#ifdef CONFIG_NET |
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static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_hash rhash; struct shash_alg *salg = __crypto_shash_alg(alg); |
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memset(&rhash, 0, sizeof(rhash)); strscpy(rhash.type, "shash", sizeof(rhash.type)); |
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rhash.blocksize = alg->cra_blocksize; rhash.digestsize = salg->digestsize; |
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return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash); |
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} |
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#else static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; } #endif |
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static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
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__maybe_unused; |
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static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) { struct shash_alg *salg = __crypto_shash_alg(alg); seq_printf(m, "type : shash "); seq_printf(m, "blocksize : %u ", alg->cra_blocksize); seq_printf(m, "digestsize : %u ", salg->digestsize); |
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} static const struct crypto_type crypto_shash_type = { |
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.extsize = crypto_alg_extsize, |
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.init_tfm = crypto_shash_init_tfm, #ifdef CONFIG_PROC_FS .show = crypto_shash_show, #endif |
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.report = crypto_shash_report, |
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.maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_MASK, .type = CRYPTO_ALG_TYPE_SHASH, .tfmsize = offsetof(struct crypto_shash, base), }; struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, u32 mask) { |
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return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
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} EXPORT_SYMBOL_GPL(crypto_alloc_shash); |
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static int shash_prepare_alg(struct shash_alg *alg) |
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{ struct crypto_alg *base = &alg->base; |
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if (alg->digestsize > HASH_MAX_DIGESTSIZE || alg->descsize > HASH_MAX_DESCSIZE || alg->statesize > HASH_MAX_STATESIZE) |
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return -EINVAL; |
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if ((alg->export && !alg->import) || (alg->import && !alg->export)) return -EINVAL; |
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base->cra_type = &crypto_shash_type; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; |
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if (!alg->finup) alg->finup = shash_finup_unaligned; if (!alg->digest) alg->digest = shash_digest_unaligned; |
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if (!alg->export) { alg->export = shash_default_export; alg->import = shash_default_import; alg->statesize = alg->descsize; } |
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if (!alg->setkey) alg->setkey = shash_no_setkey; |
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return 0; } int crypto_register_shash(struct shash_alg *alg) { struct crypto_alg *base = &alg->base; int err; err = shash_prepare_alg(alg); if (err) return err; |
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return crypto_register_alg(base); } EXPORT_SYMBOL_GPL(crypto_register_shash); int crypto_unregister_shash(struct shash_alg *alg) { return crypto_unregister_alg(&alg->base); } EXPORT_SYMBOL_GPL(crypto_unregister_shash); |
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int crypto_register_shashes(struct shash_alg *algs, int count) { int i, ret; for (i = 0; i < count; i++) { ret = crypto_register_shash(&algs[i]); if (ret) goto err; } return 0; err: for (--i; i >= 0; --i) crypto_unregister_shash(&algs[i]); return ret; } EXPORT_SYMBOL_GPL(crypto_register_shashes); int crypto_unregister_shashes(struct shash_alg *algs, int count) { int i, ret; for (i = count - 1; i >= 0; --i) { ret = crypto_unregister_shash(&algs[i]); if (ret) pr_err("Failed to unregister %s %s: %d ", algs[i].base.cra_driver_name, algs[i].base.cra_name, ret); } return 0; } EXPORT_SYMBOL_GPL(crypto_unregister_shashes); |
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int shash_register_instance(struct crypto_template *tmpl, struct shash_instance *inst) { int err; err = shash_prepare_alg(&inst->alg); if (err) return err; return crypto_register_instance(tmpl, shash_crypto_instance(inst)); } EXPORT_SYMBOL_GPL(shash_register_instance); |
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void shash_free_instance(struct crypto_instance *inst) { crypto_drop_spawn(crypto_instance_ctx(inst)); kfree(shash_instance(inst)); } EXPORT_SYMBOL_GPL(shash_free_instance); |
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int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, struct shash_alg *alg, struct crypto_instance *inst) { return crypto_init_spawn2(&spawn->base, &alg->base, inst, &crypto_shash_type); } EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); |
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struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) { struct crypto_alg *alg; alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); return IS_ERR(alg) ? ERR_CAST(alg) : container_of(alg, struct shash_alg, base); } EXPORT_SYMBOL_GPL(shash_attr_alg); |
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MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |