1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * sha1_base.h - core logic for SHA-1 implementations 4 * 5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <crypto/internal/hash.h> 9 #include <crypto/sha.h> 10 #include <linux/crypto.h> 11 #include <linux/module.h> 12 13 #include <asm/unaligned.h> 14 15 typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks); 16 17 static inline int sha1_base_init(struct shash_desc *desc) 18 { 19 struct sha1_state *sctx = shash_desc_ctx(desc); 20 21 sctx->state[0] = SHA1_H0; 22 sctx->state[1] = SHA1_H1; 23 sctx->state[2] = SHA1_H2; 24 sctx->state[3] = SHA1_H3; 25 sctx->state[4] = SHA1_H4; 26 sctx->count = 0; 27 28 return 0; 29 } 30 31 static inline int sha1_base_do_update(struct shash_desc *desc, 32 const u8 *data, 33 unsigned int len, 34 sha1_block_fn *block_fn) 35 { 36 struct sha1_state *sctx = shash_desc_ctx(desc); 37 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 38 39 sctx->count += len; 40 41 if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) { 42 int blocks; 43 44 if (partial) { 45 int p = SHA1_BLOCK_SIZE - partial; 46 47 memcpy(sctx->buffer + partial, data, p); 48 data += p; 49 len -= p; 50 51 block_fn(sctx, sctx->buffer, 1); 52 } 53 54 blocks = len / SHA1_BLOCK_SIZE; 55 len %= SHA1_BLOCK_SIZE; 56 57 if (blocks) { 58 block_fn(sctx, data, blocks); 59 data += blocks * SHA1_BLOCK_SIZE; 60 } 61 partial = 0; 62 } 63 if (len) 64 memcpy(sctx->buffer + partial, data, len); 65 66 return 0; 67 } 68 69 static inline int sha1_base_do_finalize(struct shash_desc *desc, 70 sha1_block_fn *block_fn) 71 { 72 const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64); 73 struct sha1_state *sctx = shash_desc_ctx(desc); 74 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); 75 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 76 77 sctx->buffer[partial++] = 0x80; 78 if (partial > bit_offset) { 79 memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial); 80 partial = 0; 81 82 block_fn(sctx, sctx->buffer, 1); 83 } 84 85 memset(sctx->buffer + partial, 0x0, bit_offset - partial); 86 *bits = cpu_to_be64(sctx->count << 3); 87 block_fn(sctx, sctx->buffer, 1); 88 89 return 0; 90 } 91 92 static inline int sha1_base_finish(struct shash_desc *desc, u8 *out) 93 { 94 struct sha1_state *sctx = shash_desc_ctx(desc); 95 __be32 *digest = (__be32 *)out; 96 int i; 97 98 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++) 99 put_unaligned_be32(sctx->state[i], digest++); 100 101 *sctx = (struct sha1_state){}; 102 return 0; 103 } 104