projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 11b8d5ef AB |
1 | /* |
| 2 | * sha256_base.h - core logic for SHA-256 implementations | |
| 3 | * | |
| 4 | * Copyright (C) 2015 Linaro Ltd <[email protected]> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <crypto/internal/hash.h> | |
| 12 | #include <crypto/sha.h> | |
| 13 | #include <linux/crypto.h> | |
| 14 | #include <linux/module.h> | |
| 15 | ||
| 16 | #include <asm/unaligned.h> | |
| 17 | ||
| 18 | typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src, | |
| 19 | int blocks); | |
| 20 | ||
| 21 | static inline int sha224_base_init(struct shash_desc *desc) | |
| 22 | { | |
| 23 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
| 24 | ||
| 25 | sctx->state[0] = SHA224_H0; | |
| 26 | sctx->state[1] = SHA224_H1; | |
| 27 | sctx->state[2] = SHA224_H2; | |
| 28 | sctx->state[3] = SHA224_H3; | |
| 29 | sctx->state[4] = SHA224_H4; | |
| 30 | sctx->state[5] = SHA224_H5; | |
| 31 | sctx->state[6] = SHA224_H6; | |
| 32 | sctx->state[7] = SHA224_H7; | |
| 33 | sctx->count = 0; | |
| 34 | ||
| 35 | return 0; | |
| 36 | } | |
| 37 | ||
| 38 | static inline int sha256_base_init(struct shash_desc *desc) | |
| 39 | { | |
| 40 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
| 41 | ||
| 42 | sctx->state[0] = SHA256_H0; | |
| 43 | sctx->state[1] = SHA256_H1; | |
| 44 | sctx->state[2] = SHA256_H2; | |
| 45 | sctx->state[3] = SHA256_H3; | |
| 46 | sctx->state[4] = SHA256_H4; | |
| 47 | sctx->state[5] = SHA256_H5; | |
| 48 | sctx->state[6] = SHA256_H6; | |
| 49 | sctx->state[7] = SHA256_H7; | |
| 50 | sctx->count = 0; | |
| 51 | ||
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static inline int sha256_base_do_update(struct shash_desc *desc, | |
| 56 | const u8 *data, | |
| 57 | unsigned int len, | |
| 58 | sha256_block_fn *block_fn) | |
| 59 | { | |
| 60 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
| 61 | unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; | |
| 62 | ||
| 63 | sctx->count += len; | |
| 64 | ||
| 65 | if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) { | |
| 66 | int blocks; | |
| 67 | ||
| 68 | if (partial) { | |
| 69 | int p = SHA256_BLOCK_SIZE - partial; | |
| 70 | ||
| 71 | memcpy(sctx->buf + partial, data, p); | |
| 72 | data += p; | |
| 73 | len -= p; | |
| 74 | ||
| 75 | block_fn(sctx, sctx->buf, 1); | |
| 76 | } | |
| 77 | ||
| 78 | blocks = len / SHA256_BLOCK_SIZE; | |
| 79 | len %= SHA256_BLOCK_SIZE; | |
| 80 | ||
| 81 | if (blocks) { | |
| 82 | block_fn(sctx, data, blocks); | |
| 83 | data += blocks * SHA256_BLOCK_SIZE; | |
| 84 | } | |
| 85 | partial = 0; | |
| 86 | } | |
| 87 | if (len) | |
| 88 | memcpy(sctx->buf + partial, data, len); | |
| 89 | ||
| 90 | return 0; | |
| 91 | } | |
| 92 | ||
| 93 | static inline int sha256_base_do_finalize(struct shash_desc *desc, | |
| 94 | sha256_block_fn *block_fn) | |
| 95 | { | |
| 96 | const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64); | |
| 97 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
| 98 | __be64 *bits = (__be64 *)(sctx->buf + bit_offset); | |
| 99 | unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; | |
| 100 | ||
| 101 | sctx->buf[partial++] = 0x80; | |
| 102 | if (partial > bit_offset) { | |
| 103 | memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial); | |
| 104 | partial = 0; | |
| 105 | ||
| 106 | block_fn(sctx, sctx->buf, 1); | |
| 107 | } | |
| 108 | ||
| 109 | memset(sctx->buf + partial, 0x0, bit_offset - partial); | |
| 110 | *bits = cpu_to_be64(sctx->count << 3); | |
| 111 | block_fn(sctx, sctx->buf, 1); | |
| 112 | ||
| 113 | return 0; | |
| 114 | } | |
| 115 | ||
| 116 | static inline int sha256_base_finish(struct shash_desc *desc, u8 *out) | |
| 117 | { | |
| 118 | unsigned int digest_size = crypto_shash_digestsize(desc->tfm); | |
| 119 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
| 120 | __be32 *digest = (__be32 *)out; | |
| 121 | int i; | |
| 122 | ||
| 123 | for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32)) | |
| 124 | put_unaligned_be32(sctx->state[i], digest++); | |
| 125 | ||
| 126 | *sctx = (struct sha256_state){}; | |
| 127 | return 0; | |
| 128 | } |