1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * sm3_base.h - core logic for SM3 implementations 4 * 5 * Copyright (C) 2017 ARM Limited or its affiliates. 6 * Written by Gilad Ben-Yossef <gilad@benyossef.com> 7 */ 8 9 #ifndef _CRYPTO_SM3_BASE_H 10 #define _CRYPTO_SM3_BASE_H 11 12 #include <crypto/internal/hash.h> 13 #include <crypto/sm3.h> 14 #include <linux/crypto.h> 15 #include <linux/module.h> 16 #include <linux/string.h> 17 #include <linux/unaligned.h> 18 19 typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks); 20 21 static inline int sm3_base_init(struct shash_desc *desc) 22 { 23 struct sm3_state *sctx = shash_desc_ctx(desc); 24 25 sctx->state[0] = SM3_IVA; 26 sctx->state[1] = SM3_IVB; 27 sctx->state[2] = SM3_IVC; 28 sctx->state[3] = SM3_IVD; 29 sctx->state[4] = SM3_IVE; 30 sctx->state[5] = SM3_IVF; 31 sctx->state[6] = SM3_IVG; 32 sctx->state[7] = SM3_IVH; 33 sctx->count = 0; 34 35 return 0; 36 } 37 38 static inline int sm3_base_do_update(struct shash_desc *desc, 39 const u8 *data, 40 unsigned int len, 41 sm3_block_fn *block_fn) 42 { 43 struct sm3_state *sctx = shash_desc_ctx(desc); 44 unsigned int partial = sctx->count % SM3_BLOCK_SIZE; 45 46 sctx->count += len; 47 48 if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) { 49 int blocks; 50 51 if (partial) { 52 int p = SM3_BLOCK_SIZE - partial; 53 54 memcpy(sctx->buffer + partial, data, p); 55 data += p; 56 len -= p; 57 58 block_fn(sctx, sctx->buffer, 1); 59 } 60 61 blocks = len / SM3_BLOCK_SIZE; 62 len %= SM3_BLOCK_SIZE; 63 64 if (blocks) { 65 block_fn(sctx, data, blocks); 66 data += blocks * SM3_BLOCK_SIZE; 67 } 68 partial = 0; 69 } 70 if (len) 71 memcpy(sctx->buffer + partial, data, len); 72 73 return 0; 74 } 75 76 static inline int sm3_base_do_finalize(struct shash_desc *desc, 77 sm3_block_fn *block_fn) 78 { 79 const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64); 80 struct sm3_state *sctx = shash_desc_ctx(desc); 81 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); 82 unsigned int partial = sctx->count % SM3_BLOCK_SIZE; 83 84 sctx->buffer[partial++] = 0x80; 85 if (partial > bit_offset) { 86 memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial); 87 partial = 0; 88 89 block_fn(sctx, sctx->buffer, 1); 90 } 91 92 memset(sctx->buffer + partial, 0x0, bit_offset - partial); 93 *bits = cpu_to_be64(sctx->count << 3); 94 block_fn(sctx, sctx->buffer, 1); 95 96 return 0; 97 } 98 99 static inline int sm3_base_finish(struct shash_desc *desc, u8 *out) 100 { 101 struct sm3_state *sctx = shash_desc_ctx(desc); 102 __be32 *digest = (__be32 *)out; 103 int i; 104 105 for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++) 106 put_unaligned_be32(sctx->state[i], digest++); 107 108 memzero_explicit(sctx, sizeof(*sctx)); 109 return 0; 110 } 111 112 #endif /* _CRYPTO_SM3_BASE_H */ 113