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[92.90.20.129]) by mx.google.com with ESMTPSA id jt8sm15507705wid.4.2015.03.30.02.36.55 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 30 Mar 2015 02:36:57 -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: [PATCH v2 04/14] crypto: sha512-generic: move to generic glue implementation Date: Mon, 30 Mar 2015 11:36:17 +0200 Message-Id: <1427708184-2353-8-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 209.85.192.48 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 updated the generic SHA-512 implementation to use the generic shared SHA-512 glue code. It also implements a .finup hook crypto_sha512_finup() and exports it to other modules. Signed-off-by: Ard Biesheuvel --- crypto/Kconfig | 1 + crypto/sha512_generic.c | 126 ++++++++++-------------------------------------- include/crypto/sha.h | 2 + 3 files changed, 28 insertions(+), 101 deletions(-) diff --git a/crypto/Kconfig b/crypto/Kconfig index 155cc15c2719..83bc1680391a 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -653,6 +653,7 @@ config CRYPTO_SHA512_BASE config CRYPTO_SHA512 tristate "SHA384 and SHA512 digest algorithms" + select CRYPTO_SHA512_BASE select CRYPTO_HASH help SHA512 secure hash standard (DFIPS 180-2). diff --git a/crypto/sha512_generic.c b/crypto/sha512_generic.c index 1c3c3767e079..88f36a6920ef 100644 --- a/crypto/sha512_generic.c +++ b/crypto/sha512_generic.c @@ -130,125 +130,48 @@ sha512_transform(u64 *state, const u8 *input) a = b = c = d = e = f = g = h = t1 = t2 = 0; } -static int -sha512_init(struct shash_desc *desc) +static void sha512_generic_block_fn(int blocks, u8 const *src, u64 *state, + const u8 *head, void *p) { - struct sha512_state *sctx = shash_desc_ctx(desc); - sctx->state[0] = SHA512_H0; - sctx->state[1] = SHA512_H1; - sctx->state[2] = SHA512_H2; - sctx->state[3] = SHA512_H3; - sctx->state[4] = SHA512_H4; - sctx->state[5] = SHA512_H5; - sctx->state[6] = SHA512_H6; - sctx->state[7] = SHA512_H7; - sctx->count[0] = sctx->count[1] = 0; + if (head) + sha512_transform(state, head); - return 0; -} - -static int -sha384_init(struct shash_desc *desc) -{ - struct sha512_state *sctx = shash_desc_ctx(desc); - sctx->state[0] = SHA384_H0; - sctx->state[1] = SHA384_H1; - sctx->state[2] = SHA384_H2; - sctx->state[3] = SHA384_H3; - sctx->state[4] = SHA384_H4; - sctx->state[5] = SHA384_H5; - sctx->state[6] = SHA384_H6; - sctx->state[7] = SHA384_H7; - sctx->count[0] = sctx->count[1] = 0; - - return 0; + while (blocks--) { + sha512_transform(state, src); + src += SHA512_BLOCK_SIZE; + } } int crypto_sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len) { - struct sha512_state *sctx = shash_desc_ctx(desc); - - unsigned int i, index, part_len; - - /* Compute number of bytes mod 128 */ - index = sctx->count[0] & 0x7f; - - /* Update number of bytes */ - if ((sctx->count[0] += len) < len) - sctx->count[1]++; - - part_len = 128 - index; - - /* Transform as many times as possible. */ - if (len >= part_len) { - memcpy(&sctx->buf[index], data, part_len); - sha512_transform(sctx->state, sctx->buf); - - for (i = part_len; i + 127 < len; i+=128) - sha512_transform(sctx->state, &data[i]); - - index = 0; - } else { - i = 0; - } - - /* Buffer remaining input */ - memcpy(&sctx->buf[index], &data[i], len - i); - - return 0; + return crypto_sha512_base_do_update(desc, data, len, + sha512_generic_block_fn, NULL); } EXPORT_SYMBOL(crypto_sha512_update); -static int -sha512_final(struct shash_desc *desc, u8 *hash) +int crypto_sha512_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *hash) { - struct sha512_state *sctx = shash_desc_ctx(desc); - static u8 padding[128] = { 0x80, }; - __be64 *dst = (__be64 *)hash; - __be64 bits[2]; - unsigned int index, pad_len; - int i; - - /* Save number of bits */ - bits[1] = cpu_to_be64(sctx->count[0] << 3); - bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61); - - /* Pad out to 112 mod 128. */ - index = sctx->count[0] & 0x7f; - pad_len = (index < 112) ? (112 - index) : ((128+112) - index); - crypto_sha512_update(desc, padding, pad_len); - - /* Append length (before padding) */ - crypto_sha512_update(desc, (const u8 *)bits, sizeof(bits)); - - /* Store state in digest */ - for (i = 0; i < 8; i++) - dst[i] = cpu_to_be64(sctx->state[i]); - - /* Zeroize sensitive information. */ - memset(sctx, 0, sizeof(struct sha512_state)); - - return 0; + if (len) + crypto_sha512_base_do_update(desc, data, len, + sha512_generic_block_fn, NULL); + crypto_sha512_base_do_finalize(desc, sha512_generic_block_fn, NULL); + return crypto_sha512_base_finish(desc, hash); } +EXPORT_SYMBOL(crypto_sha512_finup); -static int sha384_final(struct shash_desc *desc, u8 *hash) +int sha512_final(struct shash_desc *desc, u8 *hash) { - u8 D[64]; - - sha512_final(desc, D); - - memcpy(hash, D, 48); - memzero_explicit(D, 64); - - return 0; + return crypto_sha512_finup(desc, NULL, 0, hash); } static struct shash_alg sha512_algs[2] = { { .digestsize = SHA512_DIGEST_SIZE, - .init = sha512_init, + .init = crypto_sha512_base_init, .update = crypto_sha512_update, .final = sha512_final, + .finup = crypto_sha512_finup, .descsize = sizeof(struct sha512_state), .base = { .cra_name = "sha512", @@ -259,9 +182,10 @@ static struct shash_alg sha512_algs[2] = { { } }, { .digestsize = SHA384_DIGEST_SIZE, - .init = sha384_init, + .init = crypto_sha384_base_init, .update = crypto_sha512_update, - .final = sha384_final, + .final = sha512_final, + .finup = crypto_sha512_finup, .descsize = sizeof(struct sha512_state), .base = { .cra_name = "sha384", diff --git a/include/crypto/sha.h b/include/crypto/sha.h index 63cba0bbf3bc..17a1c43b2a01 100644 --- a/include/crypto/sha.h +++ b/include/crypto/sha.h @@ -100,6 +100,8 @@ extern int crypto_sha256_update(struct shash_desc *desc, const u8 *data, extern int crypto_sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len); +extern int crypto_sha512_finup(struct shash_desc *desc, const u8 *data, + unsigned int len, u8 *hash); extern int crypto_sha384_base_init(struct shash_desc *desc); extern int crypto_sha512_base_init(struct shash_desc *desc);