135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* sha512_base.h - core logic for SHA-512 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_SHA512_BASE_H
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#define _CRYPTO_SHA512_BASE_H
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#include <crypto/internal/hash.h>
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#include <crypto/sha2.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 (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
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int blocks);
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static inline int sha384_base_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA384_H0;
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sctx->state[1] = SHA384_H1;
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sctx->state[2] = SHA384_H2;
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sctx->state[3] = SHA384_H3;
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sctx->state[4] = SHA384_H4;
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sctx->state[5] = SHA384_H5;
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sctx->state[6] = SHA384_H6;
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sctx->state[7] = SHA384_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static inline int sha512_base_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA512_H0;
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sctx->state[1] = SHA512_H1;
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sctx->state[2] = SHA512_H2;
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sctx->state[3] = SHA512_H3;
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sctx->state[4] = SHA512_H4;
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sctx->state[5] = SHA512_H5;
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sctx->state[6] = SHA512_H6;
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sctx->state[7] = SHA512_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static inline int sha512_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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sha512_block_fn *block_fn)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
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sctx->count[0] += len;
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if (sctx->count[0] < len)
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sctx->count[1]++;
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if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
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int blocks;
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if (partial) {
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int p = SHA512_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, p);
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data += p;
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len -= p;
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block_fn(sctx, sctx->buf, 1);
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}
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blocks = len / SHA512_BLOCK_SIZE;
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len %= SHA512_BLOCK_SIZE;
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if (blocks) {
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block_fn(sctx, data, blocks);
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data += blocks * SHA512_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->buf + partial, data, len);
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return 0;
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}
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static inline int sha512_base_do_finalize(struct shash_desc *desc,
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sha512_block_fn *block_fn)
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{
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const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
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struct sha512_state *sctx = shash_desc_ctx(desc);
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__be64 *bits = (__be64 *)(sctx->buf + bit_offset);
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unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
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sctx->buf[partial++] = 0x80;
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if (partial > bit_offset) {
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memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
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partial = 0;
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block_fn(sctx, sctx->buf, 1);
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}
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memset(sctx->buf + partial, 0x0, bit_offset - partial);
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bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
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bits[1] = cpu_to_be64(sctx->count[0] << 3);
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block_fn(sctx, sctx->buf, 1);
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return 0;
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}
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static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
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{
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unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
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struct sha512_state *sctx = shash_desc_ctx(desc);
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__be64 *digest = (__be64 *)out;
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int i;
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for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
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put_unaligned_be64(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_SHA512_BASE_H */
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