diff options
| -rw-r--r-- | crypto/crc32c.c | 185 |
1 files changed, 53 insertions, 132 deletions
diff --git a/crypto/crc32c.c b/crypto/crc32c.c index a882d9e..b21b93f 100644 --- a/crypto/crc32c.c +++ b/crypto/crc32c.c @@ -25,20 +25,26 @@ #define CHKSUM_DIGEST_SIZE 4 struct chksum_ctx { - u32 crc; u32 key; }; +struct chksum_desc_ctx { + u32 crc; +}; + /* * Steps through buffer one byte at at time, calculates reflected * crc using table. */ -static void chksum_init(struct crypto_tfm *tfm) +static int chksum_init(struct shash_desc *desc) { - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); + struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); + struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); + + ctx->crc = mctx->key; - mctx->crc = mctx->key; + return 0; } /* @@ -46,180 +52,95 @@ static void chksum_init(struct crypto_tfm *tfm) * If your algorithm starts with ~0, then XOR with ~0 before you set * the seed. */ -static int chksum_setkey(struct crypto_tfm *tfm, const u8 *key, +static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); + struct chksum_ctx *mctx = crypto_shash_ctx(tfm); - if (keylen != sizeof(mctx->crc)) { - tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; + if (keylen != sizeof(mctx->key)) { + crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); return -EINVAL; } mctx->key = le32_to_cpu(*(__le32 *)key); return 0; } -static void chksum_update(struct crypto_tfm *tfm, const u8 *data, - unsigned int length) +static int chksum_update(struct shash_desc *desc, const u8 *data, + unsigned int length) { - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); + struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - mctx->crc = crc32c(mctx->crc, data, length); -} - -static void chksum_final(struct crypto_tfm *tfm, u8 *out) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - *(__le32 *)out = ~cpu_to_le32(mctx->crc); -} - -static int crc32c_cra_init_old(struct crypto_tfm *tfm) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - mctx->key = ~0; + ctx->crc = crc32c(ctx->crc, data, length); return 0; } -static struct crypto_alg old_alg = { - .cra_name = "crc32c", - .cra_flags = CRYPTO_ALG_TYPE_DIGEST, - .cra_blocksize = CHKSUM_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct chksum_ctx), - .cra_module = THIS_MODULE, - .cra_list = LIST_HEAD_INIT(old_alg.cra_list), - .cra_init = crc32c_cra_init_old, - .cra_u = { - .digest = { - .dia_digestsize= CHKSUM_DIGEST_SIZE, - .dia_setkey = chksum_setkey, - .dia_init = chksum_init, - .dia_update = chksum_update, - .dia_final = chksum_final - } - } -}; - -/* - * Setting the seed allows arbitrary accumulators and flexible XOR policy - * If your algorithm starts with ~0, then XOR with ~0 before you set - * the seed. - */ -static int crc32c_setkey(struct crypto_ahash *hash, const u8 *key, - unsigned int keylen) +static int chksum_final(struct shash_desc *desc, u8 *out) { - u32 *mctx = crypto_ahash_ctx(hash); + struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - if (keylen != sizeof(u32)) { - crypto_ahash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN); - return -EINVAL; - } - *mctx = le32_to_cpup((__le32 *)key); + *(__le32 *)out = ~cpu_to_le32p(&ctx->crc); return 0; } -static int crc32c_init(struct ahash_request *req) +static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out) { - u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); - u32 *crcp = ahash_request_ctx(req); - - *crcp = *mctx; + *(__le32 *)out = ~cpu_to_le32(crc32c(*crcp, data, len)); return 0; } -static int crc32c_update(struct ahash_request *req) +static int chksum_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *out) { - struct crypto_hash_walk walk; - u32 *crcp = ahash_request_ctx(req); - u32 crc = *crcp; - int nbytes; - - for (nbytes = crypto_hash_walk_first(req, &walk); nbytes; - nbytes = crypto_hash_walk_done(&walk, 0)) - crc = crc32c(crc, walk.data, nbytes); + struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - *crcp = crc; - return 0; + return __chksum_finup(&ctx->crc, data, len, out); } -static int crc32c_final(struct ahash_request *req) +static int chksum_digest(struct shash_desc *desc, const u8 *data, + unsigned int length, u8 *out) { - u32 *crcp = ahash_request_ctx(req); - - *(__le32 *)req->result = ~cpu_to_le32p(crcp); - return 0; -} + struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); -static int crc32c_digest(struct ahash_request *req) -{ - struct crypto_hash_walk walk; - u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); - u32 crc = *mctx; - int nbytes; - - for (nbytes = crypto_hash_walk_first(req, &walk); nbytes; - nbytes = crypto_hash_walk_done(&walk, 0)) - crc = crc32c(crc, walk.data, nbytes); - - *(__le32 *)req->result = ~cpu_to_le32(crc); - return 0; + return __chksum_finup(&mctx->key, data, length, out); } static int crc32c_cra_init(struct crypto_tfm *tfm) { - u32 *key = crypto_tfm_ctx(tfm); - - *key = ~0; - - tfm->crt_ahash.reqsize = sizeof(u32); + struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); + mctx->key = ~0; return 0; } -static struct crypto_alg alg = { - .cra_name = "crc32c", - .cra_driver_name = "crc32c-generic", - .cra_priority = 100, - .cra_flags = CRYPTO_ALG_TYPE_AHASH, - .cra_blocksize = CHKSUM_BLOCK_SIZE, - .cra_alignmask = 3, - .cra_ctxsize = sizeof(u32), - .cra_module = THIS_MODULE, - .cra_list = LIST_HEAD_INIT(alg.cra_list), - .cra_init = crc32c_cra_init, - .cra_type = &crypto_ahash_type, - .cra_u = { - .ahash = { - .digestsize = CHKSUM_DIGEST_SIZE, - .setkey = crc32c_setkey, - .init = crc32c_init, - .update = crc32c_update, - .final = crc32c_final, - .digest = crc32c_digest, - } +static struct shash_alg alg = { + .digestsize = CHKSUM_DIGEST_SIZE, + .setkey = chksum_setkey, + .init = chksum_init, + .update = chksum_update, + .final = chksum_final, + .finup = chksum_finup, + .digest = chksum_digest, + .descsize = sizeof(struct chksum_desc_ctx), + .base = { + .cra_name = "crc32c", + .cra_driver_name = "crc32c-generic", + .cra_priority = 100, + .cra_blocksize = CHKSUM_BLOCK_SIZE, + .cra_alignmask = 3, + .cra_ctxsize = sizeof(struct chksum_ctx), + .cra_module = THIS_MODULE, + .cra_init = crc32c_cra_init, } }; static int __init crc32c_mod_init(void) { - int err; - - err = crypto_register_alg(&old_alg); - if (err) - return err; - - err = crypto_register_alg(&alg); - if (err) - crypto_unregister_alg(&old_alg); - - return err; + return crypto_register_shash(&alg); } static void __exit crc32c_mod_fini(void) { - crypto_unregister_alg(&alg); - crypto_unregister_alg(&old_alg); + crypto_unregister_shash(&alg); } module_init(crc32c_mod_init); |
