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[92.90.20.129]) by mx.google.com with ESMTPSA id jt8sm15507705wid.4.2015.03.30.02.36.51 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 30 Mar 2015 02:36:54 -0700 (PDT) From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, samitolvanen@google.com, herbert@gondor.apana.org.au, jussi.kivilinna@iki.fi, stockhausen@collogia.de, x86@kernel.org Cc: Ard Biesheuvel Subject: [RFC PATCH 4/6] crypto: sha256-generic: move to generic glue implementation Date: Mon, 30 Mar 2015 11:36:16 +0200 Message-Id: <1427708184-2353-7-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1427708184-2353-1-git-send-email-ard.biesheuvel@linaro.org> References: <1427708184-2353-1-git-send-email-ard.biesheuvel@linaro.org> Sender: linux-crypto-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: ard.biesheuvel@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.192.46 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , This updates the generic SHA-256 implementation to use the new shared SHA-256 glue code. Signed-off-by: Ard Biesheuvel --- crypto/Kconfig | 1 + crypto/sha256_generic.c | 131 +++++++----------------------------------------- 2 files changed, 18 insertions(+), 114 deletions(-) diff --git a/crypto/Kconfig b/crypto/Kconfig index 551bbf2e2ab5..59243df4ea13 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -608,6 +608,7 @@ config CRYPTO_SHA256_BASE config CRYPTO_SHA256 tristate "SHA224 and SHA256 digest algorithm" + select CRYPTO_SHA256_BASE select CRYPTO_HASH help SHA256 secure hash standard (DFIPS 180-2). diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c index b001ff5c2efc..7119346c2f41 100644 --- a/crypto/sha256_generic.c +++ b/crypto/sha256_generic.c @@ -214,136 +214,39 @@ static void sha256_transform(u32 *state, const u8 *input) memzero_explicit(W, 64 * sizeof(u32)); } -static int sha224_init(struct shash_desc *desc) +static void sha256_generic_block_fn(int blocks, u8 const *src, u32 *state, + const u8 *head, void *p) { - struct sha256_state *sctx = shash_desc_ctx(desc); - sctx->state[0] = SHA224_H0; - sctx->state[1] = SHA224_H1; - sctx->state[2] = SHA224_H2; - sctx->state[3] = SHA224_H3; - sctx->state[4] = SHA224_H4; - sctx->state[5] = SHA224_H5; - sctx->state[6] = SHA224_H6; - sctx->state[7] = SHA224_H7; - sctx->count = 0; + if (head) + sha256_transform(state, head); - return 0; -} - -static int sha256_init(struct shash_desc *desc) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - sctx->state[0] = SHA256_H0; - sctx->state[1] = SHA256_H1; - sctx->state[2] = SHA256_H2; - sctx->state[3] = SHA256_H3; - sctx->state[4] = SHA256_H4; - sctx->state[5] = SHA256_H5; - sctx->state[6] = SHA256_H6; - sctx->state[7] = SHA256_H7; - sctx->count = 0; - - return 0; + while (blocks--) { + sha256_transform(state, src); + src += SHA256_BLOCK_SIZE; + } } int crypto_sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len) { - struct sha256_state *sctx = shash_desc_ctx(desc); - unsigned int partial, done; - const u8 *src; - - partial = sctx->count & 0x3f; - sctx->count += len; - done = 0; - src = data; - - if ((partial + len) > 63) { - if (partial) { - done = -partial; - memcpy(sctx->buf + partial, data, done + 64); - src = sctx->buf; - } - - do { - sha256_transform(sctx->state, src); - done += 64; - src = data + done; - } while (done + 63 < len); - - partial = 0; - } - memcpy(sctx->buf + partial, src, len - done); - - return 0; + return sha256_base_do_update(desc, data, len, sha256_generic_block_fn, + NULL); } EXPORT_SYMBOL(crypto_sha256_update); static int sha256_final(struct shash_desc *desc, u8 *out) { - struct sha256_state *sctx = shash_desc_ctx(desc); - __be32 *dst = (__be32 *)out; - __be64 bits; - unsigned int index, pad_len; - int i; - static const u8 padding[64] = { 0x80, }; - - /* Save number of bits */ - bits = cpu_to_be64(sctx->count << 3); - - /* Pad out to 56 mod 64. */ - index = sctx->count & 0x3f; - pad_len = (index < 56) ? (56 - index) : ((64+56) - index); - crypto_sha256_update(desc, padding, pad_len); - - /* Append length (before padding) */ - crypto_sha256_update(desc, (const u8 *)&bits, sizeof(bits)); - - /* Store state in digest */ - for (i = 0; i < 8; i++) - dst[i] = cpu_to_be32(sctx->state[i]); - - /* Zeroize sensitive information. */ - memset(sctx, 0, sizeof(*sctx)); - - return 0; -} - -static int sha224_final(struct shash_desc *desc, u8 *hash) -{ - u8 D[SHA256_DIGEST_SIZE]; - - sha256_final(desc, D); - - memcpy(hash, D, SHA224_DIGEST_SIZE); - memzero_explicit(D, SHA256_DIGEST_SIZE); - - return 0; -} - -static int sha256_export(struct shash_desc *desc, void *out) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - - memcpy(out, sctx, sizeof(*sctx)); - return 0; -} - -static int sha256_import(struct shash_desc *desc, const void *in) -{ - struct sha256_state *sctx = shash_desc_ctx(desc); - - memcpy(sctx, in, sizeof(*sctx)); - return 0; + sha256_base_do_finalize(desc, sha256_generic_block_fn, NULL); + return sha256_base_finish(desc, out); } static struct shash_alg sha256_algs[2] = { { .digestsize = SHA256_DIGEST_SIZE, - .init = sha256_init, + .init = sha256_base_init, .update = crypto_sha256_update, .final = sha256_final, - .export = sha256_export, - .import = sha256_import, + .export = sha256_base_export, + .import = sha256_base_import, .descsize = sizeof(struct sha256_state), .statesize = sizeof(struct sha256_state), .base = { @@ -355,9 +258,9 @@ static struct shash_alg sha256_algs[2] = { { } }, { .digestsize = SHA224_DIGEST_SIZE, - .init = sha224_init, + .init = sha224_base_init, .update = crypto_sha256_update, - .final = sha224_final, + .final = sha256_final, .descsize = sizeof(struct sha256_state), .base = { .cra_name = "sha224",