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Linux/include/crypto/sha256_base.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * sha256_base.h - core logic for SHA-256 implementations
  4  *
  5  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
  6  */
  7 
  8 #ifndef _CRYPTO_SHA256_BASE_H
  9 #define _CRYPTO_SHA256_BASE_H
 10 
 11 #include <crypto/internal/hash.h>
 12 #include <crypto/sha2.h>
 13 #include <linux/crypto.h>
 14 #include <linux/module.h>
 15 #include <linux/string.h>
 16 
 17 #include <asm/unaligned.h>
 18 
 19 typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
 20                                int blocks);
 21 
 22 static inline int sha224_base_init(struct shash_desc *desc)
 23 {
 24         struct sha256_state *sctx = shash_desc_ctx(desc);
 25 
 26         sha224_init(sctx);
 27         return 0;
 28 }
 29 
 30 static inline int sha256_base_init(struct shash_desc *desc)
 31 {
 32         struct sha256_state *sctx = shash_desc_ctx(desc);
 33 
 34         sha256_init(sctx);
 35         return 0;
 36 }
 37 
 38 static inline int sha256_base_do_update(struct shash_desc *desc,
 39                                         const u8 *data,
 40                                         unsigned int len,
 41                                         sha256_block_fn *block_fn)
 42 {
 43         struct sha256_state *sctx = shash_desc_ctx(desc);
 44         unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
 45 
 46         sctx->count += len;
 47 
 48         if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
 49                 int blocks;
 50 
 51                 if (partial) {
 52                         int p = SHA256_BLOCK_SIZE - partial;
 53 
 54                         memcpy(sctx->buf + partial, data, p);
 55                         data += p;
 56                         len -= p;
 57 
 58                         block_fn(sctx, sctx->buf, 1);
 59                 }
 60 
 61                 blocks = len / SHA256_BLOCK_SIZE;
 62                 len %= SHA256_BLOCK_SIZE;
 63 
 64                 if (blocks) {
 65                         block_fn(sctx, data, blocks);
 66                         data += blocks * SHA256_BLOCK_SIZE;
 67                 }
 68                 partial = 0;
 69         }
 70         if (len)
 71                 memcpy(sctx->buf + partial, data, len);
 72 
 73         return 0;
 74 }
 75 
 76 static inline int sha256_base_do_finalize(struct shash_desc *desc,
 77                                           sha256_block_fn *block_fn)
 78 {
 79         const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
 80         struct sha256_state *sctx = shash_desc_ctx(desc);
 81         __be64 *bits = (__be64 *)(sctx->buf + bit_offset);
 82         unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
 83 
 84         sctx->buf[partial++] = 0x80;
 85         if (partial > bit_offset) {
 86                 memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);
 87                 partial = 0;
 88 
 89                 block_fn(sctx, sctx->buf, 1);
 90         }
 91 
 92         memset(sctx->buf + partial, 0x0, bit_offset - partial);
 93         *bits = cpu_to_be64(sctx->count << 3);
 94         block_fn(sctx, sctx->buf, 1);
 95 
 96         return 0;
 97 }
 98 
 99 static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
100 {
101         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
102         struct sha256_state *sctx = shash_desc_ctx(desc);
103         __be32 *digest = (__be32 *)out;
104         int i;
105 
106         for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
107                 put_unaligned_be32(sctx->state[i], digest++);
108 
109         memzero_explicit(sctx, sizeof(*sctx));
110         return 0;
111 }
112 
113 #endif /* _CRYPTO_SHA256_BASE_H */
114 

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