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[209.132.180.67]) by mx.google.com with ESMTP id h4si2547968pdj.248.2015.04.07.01.52.30 for ; Tue, 07 Apr 2015 01:52:30 -0700 (PDT) Received-SPF: none (google.com: linux-crypto-owner@vger.kernel.org does not designate permitted sender hosts) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752620AbbDGIw3 (ORCPT ); Tue, 7 Apr 2015 04:52:29 -0400 Received: from mail-wi0-f181.google.com ([209.85.212.181]:34172 "EHLO mail-wi0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751242AbbDGIw2 (ORCPT ); Tue, 7 Apr 2015 04:52:28 -0400 Received: by widjs5 with SMTP id js5so5687394wid.1 for ; Tue, 07 Apr 2015 01:52:27 -0700 (PDT) X-Received: by 10.180.76.230 with SMTP id n6mr2590628wiw.15.1428396747467; Tue, 07 Apr 2015 01:52:27 -0700 (PDT) Received: from ards-macbook-pro.local ([90.174.4.191]) by mx.google.com with ESMTPSA id q10sm9935641wjr.41.2015.04.07.01.52.24 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 07 Apr 2015 01:52:26 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, herbert@gondor.apana.org.au, samitolvanen@google.com, jussi.kivilinna@iki.fi Cc: stockhausen@collogia.de, Ard Biesheuvel Subject: [PATCH v3 02/16] crypto: sha256: implement base layer for SHA-256 Date: Tue, 7 Apr 2015 10:51:50 +0200 Message-Id: <1428396724-19962-3-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1428396724-19962-1-git-send-email-ard.biesheuvel@linaro.org> References: <1428396724-19962-1-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 209.85.215.42 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: , To reduce the number of copies of boilerplate code throughout the tree, this patch implements generic glue for the SHA-256 algorithm. This allows a specific arch or hardware implementation to only implement the special handling that it needs. Signed-off-by: Ard Biesheuvel --- include/crypto/sha256_base.h | 144 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 include/crypto/sha256_base.h diff --git a/include/crypto/sha256_base.h b/include/crypto/sha256_base.h new file mode 100644 index 000000000000..237d549b4093 --- /dev/null +++ b/include/crypto/sha256_base.h @@ -0,0 +1,144 @@ +/* + * sha256_base.h - core logic for SHA-256 implementations + * + * Copyright (C) 2015 Linaro Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +#include + +typedef void (sha256_block_fn)(int blocks, u8 const *src, u32 *state, + const u8 *head, void *p); + +static inline int sha224_base_init(struct shash_desc *desc) +{ + 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; + + return 0; +} + +static inline int sha256_base_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; +} + +static inline int sha256_base_export(struct shash_desc *desc, void *out) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + struct sha256_state *dst = out; + + *dst = *sctx; + + return 0; +} + +static inline int sha256_base_import(struct shash_desc *desc, const void *in) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + struct sha256_state const *src = in; + + *sctx = *src; + + return 0; +} + +static inline int sha256_base_do_update(struct shash_desc *desc, const u8 *data, + unsigned int len, + sha256_block_fn *block_fn, void *p) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; + + sctx->count += len; + + if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) { + int blocks; + + if (partial) { + int p = SHA256_BLOCK_SIZE - partial; + + memcpy(sctx->buf + partial, data, p); + data += p; + len -= p; + } + + blocks = len / SHA256_BLOCK_SIZE; + len %= SHA256_BLOCK_SIZE; + + block_fn(blocks, data, sctx->state, + partial ? sctx->buf : NULL, p); + data += blocks * SHA256_BLOCK_SIZE; + partial = 0; + } + if (len) + memcpy(sctx->buf + partial, data, len); + + return 0; +} + +static inline int sha256_base_do_finalize(struct shash_desc *desc, + sha256_block_fn *block_fn, void *p) +{ + const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64); + struct sha256_state *sctx = shash_desc_ctx(desc); + __be64 *bits = (__be64 *)(sctx->buf + bit_offset); + unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; + + sctx->buf[partial++] = 0x80; + if (partial > bit_offset) { + memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial); + partial = 0; + + block_fn(1, sctx->buf, sctx->state, NULL, p); + } + + memset(sctx->buf + partial, 0x0, bit_offset - partial); + *bits = cpu_to_be64(sctx->count << 3); + block_fn(1, sctx->buf, sctx->state, NULL, p); + + return 0; +} + +static inline int sha256_base_finish(struct shash_desc *desc, u8 *out) +{ + unsigned int digest_size = crypto_shash_digestsize(desc->tfm); + struct sha256_state *sctx = shash_desc_ctx(desc); + __be32 *digest = (__be32 *)out; + int i; + + for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32)) + put_unaligned_be32(sctx->state[i], digest++); + + *sctx = (struct sha256_state){}; + return 0; +}