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 <asm/unaligned.h> 17 18 typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks); 19 20 static inline int sm3_base_init(struct shash_desc *desc) 21 { 22 struct sm3_state *sctx = shash_desc_ctx(desc); 23 24 sctx->state[0] = SM3_IVA; 25 sctx->state[1] = SM3_IVB; 26 sctx->state[2] = SM3_IVC; 27 sctx->state[3] = SM3_IVD; 28 sctx->state[4] = SM3_IVE; 29 sctx->state[5] = SM3_IVF; 30 sctx->state[6] = SM3_IVG; 31 sctx->state[7] = SM3_IVH; 32 sctx->count = 0; 33 34 return 0; 35 } 36 37 static inline int sm3_base_do_update(struct shash_desc *desc, 38 const u8 *data, 39 unsigned int len, 40 sm3_block_fn *block_fn) 41 { 42 struct sm3_state *sctx = shash_desc_ctx(desc); 43 unsigned int partial = sctx->count % SM3_BLOCK_SIZE; 44 45 sctx->count += len; 46 47 if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) { 48 int blocks; 49 50 if (partial) { 51 int p = SM3_BLOCK_SIZE - partial; 52 53 memcpy(sctx->buffer + partial, data, p); 54 data += p; 55 len -= p; 56 57 block_fn(sctx, sctx->buffer, 1); 58 } 59 60 blocks = len / SM3_BLOCK_SIZE; 61 len %= SM3_BLOCK_SIZE; 62 63 if (blocks) { 64 block_fn(sctx, data, blocks); 65 data += blocks * SM3_BLOCK_SIZE; 66 } 67 partial = 0; 68 } 69 if (len) 70 memcpy(sctx->buffer + partial, data, len); 71 72 return 0; 73 } 74 75 static inline int sm3_base_do_finalize(struct shash_desc *desc, 76 sm3_block_fn *block_fn) 77 { 78 const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64); 79 struct sm3_state *sctx = shash_desc_ctx(desc); 80 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); 81 unsigned int partial = sctx->count % SM3_BLOCK_SIZE; 82 83 sctx->buffer[partial++] = 0x80; 84 if (partial > bit_offset) { 85 memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial); 86 partial = 0; 87 88 block_fn(sctx, sctx->buffer, 1); 89 } 90 91 memset(sctx->buffer + partial, 0x0, bit_offset - partial); 92 *bits = cpu_to_be64(sctx->count << 3); 93 block_fn(sctx, sctx->buffer, 1); 94 95 return 0; 96 } 97 98 static inline int sm3_base_finish(struct shash_desc *desc, u8 *out) 99 { 100 struct sm3_state *sctx = shash_desc_ctx(desc); 101 __be32 *digest = (__be32 *)out; 102 int i; 103 104 for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++) 105 put_unaligned_be32(sctx->state[i], digest++); 106 107 *sctx = (struct sm3_state){}; 108 return 0; 109 } 110 111 #endif /* _CRYPTO_SM3_BASE_H */ 112