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(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 /* Helper functions for BLAKE2s shared by the library and shash APIs */ 28 29 static __always_inline void 30 __blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen, 31 bool force_generic) 32 { 33 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen; 34 35 if (unlikely(!inlen)) 36 return; 37 if (inlen > fill) { 38 memcpy(state->buf + state->buflen, in, fill); 39 if (force_generic) 40 blake2s_compress_generic(state, state->buf, 1, 41 BLAKE2S_BLOCK_SIZE); 42 else 43 blake2s_compress(state, state->buf, 1, 44 BLAKE2S_BLOCK_SIZE); 45 state->buflen = 0; 46 in += fill; 47 inlen -= fill; 48 } 49 if (inlen > BLAKE2S_BLOCK_SIZE) { 50 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE); 51 /* Hash one less (full) block than strictly possible */ 52 if (force_generic) 53 blake2s_compress_generic(state, in, nblocks - 1, 54 BLAKE2S_BLOCK_SIZE); 55 else 56 blake2s_compress(state, in, nblocks - 1, 57 BLAKE2S_BLOCK_SIZE); 58 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1); 59 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1); 60 } 61 memcpy(state->buf + state->buflen, in, inlen); 62 state->buflen += inlen; 63 } 64 65 static __always_inline void 66 __blake2s_final(struct blake2s_state *state, u8 *out, bool force_generic) 67 { 68 blake2s_set_lastblock(state); 69 memset(state->buf + state->buflen, 0, 70 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */ 71 if (force_generic) 72 blake2s_compress_generic(state, state->buf, 1, state->buflen); 73 else 74 blake2s_compress(state, state->buf, 1, state->buflen); 75 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h)); 76 memcpy(out, state->h, state->outlen); 77 } 78 79 /* Helper functions for shash implementations of BLAKE2s */ 80 81 struct blake2s_tfm_ctx { 82 u8 key[BLAKE2S_KEY_SIZE]; 83 unsigned int keylen; 84 }; 85 86 static inline int crypto_blake2s_setkey(struct crypto_shash *tfm, 87 const u8 *key, unsigned int keylen) 88 { 89 struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm); 90 91 if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) 92 return -EINVAL; 93 94 memcpy(tctx->key, key, keylen); 95 tctx->keylen = keylen; 96 97 return 0; 98 } 99 100 static inline int crypto_blake2s_init(struct shash_desc *desc) 101 { 102 const struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 103 struct blake2s_state *state = shash_desc_ctx(desc); 104 unsigned int outlen = crypto_shash_digestsize(desc->tfm); 105 106 __blake2s_init(state, outlen, tctx->key, tctx->keylen); 107 return 0; 108 } 109 110 static inline int crypto_blake2s_update(struct shash_desc *desc, 111 const u8 *in, unsigned int inlen, 112 bool force_generic) 113 { 114 struct blake2s_state *state = shash_desc_ctx(desc); 115 116 __blake2s_update(state, in, inlen, force_generic); 117 return 0; 118 } 119 120 static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out, 121 bool force_generic) 122 { 123 struct blake2s_state *state = shash_desc_ctx(desc); 124 125 __blake2s_final(state, out, force_generic); 126 return 0; 127 } 128 129 #endif /* _CRYPTO_INTERNAL_BLAKE2S_H */ 130