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a24d22b225
Currently <crypto/sha.h> contains declarations for both SHA-1 and SHA-2, and <crypto/sha3.h> contains declarations for SHA-3. This organization is inconsistent, but more importantly SHA-1 is no longer considered to be cryptographically secure. So to the extent possible, SHA-1 shouldn't be grouped together with any of the other SHA versions, and usage of it should be phased out. Therefore, split <crypto/sha.h> into two headers <crypto/sha1.h> and <crypto/sha2.h>, and make everyone explicitly specify whether they want the declarations for SHA-1, SHA-2, or both. This avoids making the SHA-1 declarations visible to files that don't want anything to do with SHA-1. It also prepares for potentially moving sha1.h into a new insecure/ or dangerous/ directory. Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* sha1_base.h - core logic for SHA-1 implementations
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*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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*/
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#ifndef _CRYPTO_SHA1_BASE_H
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#define _CRYPTO_SHA1_BASE_H
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#include <crypto/internal/hash.h>
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#include <crypto/sha1.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/unaligned.h>
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typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);
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static inline int sha1_base_init(struct shash_desc *desc)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA1_H0;
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sctx->state[1] = SHA1_H1;
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sctx->state[2] = SHA1_H2;
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sctx->state[3] = SHA1_H3;
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sctx->state[4] = SHA1_H4;
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sctx->count = 0;
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return 0;
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}
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static inline int sha1_base_do_update(struct shash_desc *desc,
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const u8 *data,
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unsigned int len,
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sha1_block_fn *block_fn)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
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sctx->count += len;
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if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) {
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int blocks;
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if (partial) {
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int p = SHA1_BLOCK_SIZE - partial;
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memcpy(sctx->buffer + partial, data, p);
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data += p;
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len -= p;
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block_fn(sctx, sctx->buffer, 1);
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}
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blocks = len / SHA1_BLOCK_SIZE;
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len %= SHA1_BLOCK_SIZE;
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if (blocks) {
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block_fn(sctx, data, blocks);
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data += blocks * SHA1_BLOCK_SIZE;
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}
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partial = 0;
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}
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if (len)
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memcpy(sctx->buffer + partial, data, len);
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return 0;
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}
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static inline int sha1_base_do_finalize(struct shash_desc *desc,
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sha1_block_fn *block_fn)
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{
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const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
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unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
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sctx->buffer[partial++] = 0x80;
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if (partial > bit_offset) {
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memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial);
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partial = 0;
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block_fn(sctx, sctx->buffer, 1);
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}
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memset(sctx->buffer + partial, 0x0, bit_offset - partial);
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*bits = cpu_to_be64(sctx->count << 3);
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block_fn(sctx, sctx->buffer, 1);
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return 0;
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}
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static inline int sha1_base_finish(struct shash_desc *desc, u8 *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be32 *digest = (__be32 *)out;
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int i;
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for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], digest++);
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memzero_explicit(sctx, sizeof(*sctx));
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return 0;
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}
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#endif /* _CRYPTO_SHA1_BASE_H */
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