1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2 /* 3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. 4 */ 5 6 #ifndef _CRYPTO_BLAKE2S_H 7 #define _CRYPTO_BLAKE2S_H 8 9 #include <linux/bug.h> 10 #include <linux/types.h> 11 #include <linux/kernel.h> 12 #include <linux/string.h> 13 14 enum blake2s_lengths { 15 BLAKE2S_BLOCK_SIZE = 64, 16 BLAKE2S_HASH_SIZE = 32, 17 BLAKE2S_KEY_SIZE = 32, 18 19 BLAKE2S_128_HASH_SIZE = 16, 20 BLAKE2S_160_HASH_SIZE = 20, 21 BLAKE2S_224_HASH_SIZE = 28, 22 BLAKE2S_256_HASH_SIZE = 32, 23 }; 24 25 struct blake2s_state { 26 /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */ 27 u32 h[8]; 28 u32 t[2]; 29 u32 f[2]; 30 u8 buf[BLAKE2S_BLOCK_SIZE]; 31 unsigned int buflen; 32 unsigned int outlen; 33 }; 34 35 enum blake2s_iv { 36 BLAKE2S_IV0 = 0x6A09E667UL, 37 BLAKE2S_IV1 = 0xBB67AE85UL, 38 BLAKE2S_IV2 = 0x3C6EF372UL, 39 BLAKE2S_IV3 = 0xA54FF53AUL, 40 BLAKE2S_IV4 = 0x510E527FUL, 41 BLAKE2S_IV5 = 0x9B05688CUL, 42 BLAKE2S_IV6 = 0x1F83D9ABUL, 43 BLAKE2S_IV7 = 0x5BE0CD19UL, 44 }; 45 46 static inline void __blake2s_init(struct blake2s_state *state, size_t outlen, 47 const void *key, size_t keylen) 48 { 49 state->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen); 50 state->h[1] = BLAKE2S_IV1; 51 state->h[2] = BLAKE2S_IV2; 52 state->h[3] = BLAKE2S_IV3; 53 state->h[4] = BLAKE2S_IV4; 54 state->h[5] = BLAKE2S_IV5; 55 state->h[6] = BLAKE2S_IV6; 56 state->h[7] = BLAKE2S_IV7; 57 state->t[0] = 0; 58 state->t[1] = 0; 59 state->f[0] = 0; 60 state->f[1] = 0; 61 state->buflen = 0; 62 state->outlen = outlen; 63 if (keylen) { 64 memcpy(state->buf, key, keylen); 65 memset(&state->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen); 66 state->buflen = BLAKE2S_BLOCK_SIZE; 67 } 68 } 69 70 static inline void blake2s_init(struct blake2s_state *state, 71 const size_t outlen) 72 { 73 __blake2s_init(state, outlen, NULL, 0); 74 } 75 76 static inline void blake2s_init_key(struct blake2s_state *state, 77 const size_t outlen, const void *key, 78 const size_t keylen) 79 { 80 WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE || 81 !key || !keylen || keylen > BLAKE2S_KEY_SIZE)); 82 83 __blake2s_init(state, outlen, key, keylen); 84 } 85 86 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen); 87 void blake2s_final(struct blake2s_state *state, u8 *out); 88 89 static inline void blake2s(u8 *out, const u8 *in, const u8 *key, 90 const size_t outlen, const size_t inlen, 91 const size_t keylen) 92 { 93 struct blake2s_state state; 94 95 WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen || 96 outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE || 97 (!key && keylen))); 98 99 __blake2s_init(&state, outlen, key, keylen); 100 blake2s_update(&state, in, inlen); 101 blake2s_final(&state, out); 102 } 103 104 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen, 105 const size_t keylen); 106 107 #endif /* _CRYPTO_BLAKE2S_H */ 108