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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * sha256_base.h - core logic for SHA-256 implementations4 *5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>6 */7 8#ifndef _CRYPTO_SHA256_BASE_H9#define _CRYPTO_SHA256_BASE_H10 11#include <asm/byteorder.h>12#include <linux/unaligned.h>13#include <crypto/internal/hash.h>14#include <crypto/sha2.h>15#include <linux/string.h>16#include <linux/types.h>17 18typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,19 int blocks);20 21static inline int sha224_base_init(struct shash_desc *desc)22{23 struct sha256_state *sctx = shash_desc_ctx(desc);24 25 sha224_init(sctx);26 return 0;27}28 29static inline int sha256_base_init(struct shash_desc *desc)30{31 struct sha256_state *sctx = shash_desc_ctx(desc);32 33 sha256_init(sctx);34 return 0;35}36 37static inline int lib_sha256_base_do_update(struct sha256_state *sctx,38 const u8 *data,39 unsigned int len,40 sha256_block_fn *block_fn)41{42 unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;43 44 sctx->count += len;45 46 if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {47 int blocks;48 49 if (partial) {50 int p = SHA256_BLOCK_SIZE - partial;51 52 memcpy(sctx->buf + partial, data, p);53 data += p;54 len -= p;55 56 block_fn(sctx, sctx->buf, 1);57 }58 59 blocks = len / SHA256_BLOCK_SIZE;60 len %= SHA256_BLOCK_SIZE;61 62 if (blocks) {63 block_fn(sctx, data, blocks);64 data += blocks * SHA256_BLOCK_SIZE;65 }66 partial = 0;67 }68 if (len)69 memcpy(sctx->buf + partial, data, len);70 71 return 0;72}73 74static inline int sha256_base_do_update(struct shash_desc *desc,75 const u8 *data,76 unsigned int len,77 sha256_block_fn *block_fn)78{79 struct sha256_state *sctx = shash_desc_ctx(desc);80 81 return lib_sha256_base_do_update(sctx, data, len, block_fn);82}83 84static inline int lib_sha256_base_do_finalize(struct sha256_state *sctx,85 sha256_block_fn *block_fn)86{87 const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);88 __be64 *bits = (__be64 *)(sctx->buf + bit_offset);89 unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;90 91 sctx->buf[partial++] = 0x80;92 if (partial > bit_offset) {93 memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);94 partial = 0;95 96 block_fn(sctx, sctx->buf, 1);97 }98 99 memset(sctx->buf + partial, 0x0, bit_offset - partial);100 *bits = cpu_to_be64(sctx->count << 3);101 block_fn(sctx, sctx->buf, 1);102 103 return 0;104}105 106static inline int sha256_base_do_finalize(struct shash_desc *desc,107 sha256_block_fn *block_fn)108{109 struct sha256_state *sctx = shash_desc_ctx(desc);110 111 return lib_sha256_base_do_finalize(sctx, block_fn);112}113 114static inline int lib_sha256_base_finish(struct sha256_state *sctx, u8 *out,115 unsigned int digest_size)116{117 __be32 *digest = (__be32 *)out;118 int i;119 120 for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))121 put_unaligned_be32(sctx->state[i], digest++);122 123 memzero_explicit(sctx, sizeof(*sctx));124 return 0;125}126 127static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)128{129 unsigned int digest_size = crypto_shash_digestsize(desc->tfm);130 struct sha256_state *sctx = shash_desc_ctx(desc);131 132 return lib_sha256_base_finish(sctx, out, digest_size);133}134 135#endif /* _CRYPTO_SHA256_BASE_H */136