1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2 /* 3 * Helper functions for BLAKE2s implementations. 4 * Keep this in sync with the corresponding BLAKE2b header. 5 */ 6 7 #ifndef _CRYPTO_INTERNAL_BLAKE2S_H 8 #define _CRYPTO_INTERNAL_BLAKE2S_H 9 10 #include <crypto/blake2s.h> 11 #include <crypto/internal/hash.h> 12 #include <linux/string.h> 13 14 void blake2s_compress_generic(struct blake2s_state *state,const u8 *block, 15 size_t nblocks, const u32 inc); 16 17 void blake2s_compress_arch(struct blake2s_state *state,const u8 *block, 18 size_t nblocks, const u32 inc); 19 20 bool blake2s_selftest(void); 21 22 static inline void blake2s_set_lastblock(struct blake2s_state *state) 23 { 24 state->f[0] = -1; 25 } 26 27 typedef void (*blake2s_compress_t)(struct blake2s_state *state, 28 const u8 *block, size_t nblocks, u32 inc); 29 30 /* Helper functions for BLAKE2s shared by the library and shash APIs */ 31 32 static inline void __blake2s_update(struct blake2s_state *state, 33 const u8 *in, size_t inlen, 34 blake2s_compress_t compress) 35 { 36 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen; 37 38 if (unlikely(!inlen)) 39 return; 40 if (inlen > fill) { 41 memcpy(state->buf + state->buflen, in, fill); 42 (*compress)(state, state->buf, 1, BLAKE2S_BLOCK_SIZE); 43 state->buflen = 0; 44 in += fill; 45 inlen -= fill; 46 } 47 if (inlen > BLAKE2S_BLOCK_SIZE) { 48 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE); 49 /* Hash one less (full) block than strictly possible */ 50 (*compress)(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE); 51 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1); 52 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1); 53 } 54 memcpy(state->buf + state->buflen, in, inlen); 55 state->buflen += inlen; 56 } 57 58 static inline void __blake2s_final(struct blake2s_state *state, u8 *out, 59 blake2s_compress_t compress) 60 { 61 blake2s_set_lastblock(state); 62 memset(state->buf + state->buflen, 0, 63 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */ 64 (*compress)(state, state->buf, 1, state->buflen); 65 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h)); 66 memcpy(out, state->h, state->outlen); 67 } 68 69 /* Helper functions for shash implementations of BLAKE2s */ 70 71 struct blake2s_tfm_ctx { 72 u8 key[BLAKE2S_KEY_SIZE]; 73 unsigned int keylen; 74 }; 75 76 static inline int crypto_blake2s_setkey(struct crypto_shash *tfm, 77 const u8 *key, unsigned int keylen) 78 { 79 struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm); 80 81 if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) 82 return -EINVAL; 83 84 memcpy(tctx->key, key, keylen); 85 tctx->keylen = keylen; 86 87 return 0; 88 } 89 90 static inline int crypto_blake2s_init(struct shash_desc *desc) 91 { 92 const struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 93 struct blake2s_state *state = shash_desc_ctx(desc); 94 unsigned int outlen = crypto_shash_digestsize(desc->tfm); 95 96 __blake2s_init(state, outlen, tctx->key, tctx->keylen); 97 return 0; 98 } 99 100 static inline int crypto_blake2s_update(struct shash_desc *desc, 101 const u8 *in, unsigned int inlen, 102 blake2s_compress_t compress) 103 { 104 struct blake2s_state *state = shash_desc_ctx(desc); 105 106 __blake2s_update(state, in, inlen, compress); 107 return 0; 108 } 109 110 static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out, 111 blake2s_compress_t compress) 112 { 113 struct blake2s_state *state = shash_desc_ctx(desc); 114 115 __blake2s_final(state, out, compress); 116 return 0; 117 } 118 119 #endif /* _CRYPTO_INTERNAL_BLAKE2S_H */ 120