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Linux/include/crypto/blake2s.h

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  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 BLAKE2S_H
  7 #define BLAKE2S_H
  8 
  9 #include <linux/types.h>
 10 #include <linux/kernel.h>
 11 #include <linux/string.h>
 12 
 13 #include <asm/bug.h>
 14 
 15 enum blake2s_lengths {
 16         BLAKE2S_BLOCK_SIZE = 64,
 17         BLAKE2S_HASH_SIZE = 32,
 18         BLAKE2S_KEY_SIZE = 32,
 19 
 20         BLAKE2S_128_HASH_SIZE = 16,
 21         BLAKE2S_160_HASH_SIZE = 20,
 22         BLAKE2S_224_HASH_SIZE = 28,
 23         BLAKE2S_256_HASH_SIZE = 32,
 24 };
 25 
 26 struct blake2s_state {
 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 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
 47 void blake2s_final(struct blake2s_state *state, u8 *out);
 48 
 49 static inline void blake2s_init_param(struct blake2s_state *state,
 50                                       const u32 param)
 51 {
 52         *state = (struct blake2s_state){{
 53                 BLAKE2S_IV0 ^ param,
 54                 BLAKE2S_IV1,
 55                 BLAKE2S_IV2,
 56                 BLAKE2S_IV3,
 57                 BLAKE2S_IV4,
 58                 BLAKE2S_IV5,
 59                 BLAKE2S_IV6,
 60                 BLAKE2S_IV7,
 61         }};
 62 }
 63 
 64 static inline void blake2s_init(struct blake2s_state *state,
 65                                 const size_t outlen)
 66 {
 67         blake2s_init_param(state, 0x01010000 | outlen);
 68         state->outlen = outlen;
 69 }
 70 
 71 static inline void blake2s_init_key(struct blake2s_state *state,
 72                                     const size_t outlen, const void *key,
 73                                     const size_t keylen)
 74 {
 75         WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
 76                 !key || !keylen || keylen > BLAKE2S_KEY_SIZE));
 77 
 78         blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen);
 79         memcpy(state->buf, key, keylen);
 80         state->buflen = BLAKE2S_BLOCK_SIZE;
 81         state->outlen = outlen;
 82 }
 83 
 84 static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
 85                            const size_t outlen, const size_t inlen,
 86                            const size_t keylen)
 87 {
 88         struct blake2s_state state;
 89 
 90         WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
 91                 outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
 92                 (!key && keylen)));
 93 
 94         if (keylen)
 95                 blake2s_init_key(&state, outlen, key, keylen);
 96         else
 97                 blake2s_init(&state, outlen);
 98 
 99         blake2s_update(&state, in, inlen);
100         blake2s_final(&state, out);
101 }
102 
103 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
104                      const size_t keylen);
105 
106 #endif /* BLAKE2S_H */
107 

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