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109 lines
2.5 KiB
109 lines
2.5 KiB
/* 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 <[email protected]> |
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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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