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Linux/include/crypto/blake2b.h

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  1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
  2 
  3 #ifndef _CRYPTO_BLAKE2B_H
  4 #define _CRYPTO_BLAKE2B_H
  5 
  6 #include <linux/bug.h>
  7 #include <linux/types.h>
  8 #include <linux/kernel.h>
  9 #include <linux/string.h>
 10 
 11 enum blake2b_lengths {
 12         BLAKE2B_BLOCK_SIZE = 128,
 13         BLAKE2B_HASH_SIZE = 64,
 14         BLAKE2B_KEY_SIZE = 64,
 15 
 16         BLAKE2B_160_HASH_SIZE = 20,
 17         BLAKE2B_256_HASH_SIZE = 32,
 18         BLAKE2B_384_HASH_SIZE = 48,
 19         BLAKE2B_512_HASH_SIZE = 64,
 20 };
 21 
 22 struct blake2b_state {
 23         /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
 24         u64 h[8];
 25         u64 t[2];
 26         u64 f[2];
 27         u8 buf[BLAKE2B_BLOCK_SIZE];
 28         unsigned int buflen;
 29         unsigned int outlen;
 30 };
 31 
 32 enum blake2b_iv {
 33         BLAKE2B_IV0 = 0x6A09E667F3BCC908ULL,
 34         BLAKE2B_IV1 = 0xBB67AE8584CAA73BULL,
 35         BLAKE2B_IV2 = 0x3C6EF372FE94F82BULL,
 36         BLAKE2B_IV3 = 0xA54FF53A5F1D36F1ULL,
 37         BLAKE2B_IV4 = 0x510E527FADE682D1ULL,
 38         BLAKE2B_IV5 = 0x9B05688C2B3E6C1FULL,
 39         BLAKE2B_IV6 = 0x1F83D9ABFB41BD6BULL,
 40         BLAKE2B_IV7 = 0x5BE0CD19137E2179ULL,
 41 };
 42 
 43 static inline void __blake2b_init(struct blake2b_state *state, size_t outlen,
 44                                   const void *key, size_t keylen)
 45 {
 46         state->h[0] = BLAKE2B_IV0 ^ (0x01010000 | keylen << 8 | outlen);
 47         state->h[1] = BLAKE2B_IV1;
 48         state->h[2] = BLAKE2B_IV2;
 49         state->h[3] = BLAKE2B_IV3;
 50         state->h[4] = BLAKE2B_IV4;
 51         state->h[5] = BLAKE2B_IV5;
 52         state->h[6] = BLAKE2B_IV6;
 53         state->h[7] = BLAKE2B_IV7;
 54         state->t[0] = 0;
 55         state->t[1] = 0;
 56         state->f[0] = 0;
 57         state->f[1] = 0;
 58         state->buflen = 0;
 59         state->outlen = outlen;
 60         if (keylen) {
 61                 memcpy(state->buf, key, keylen);
 62                 memset(&state->buf[keylen], 0, BLAKE2B_BLOCK_SIZE - keylen);
 63                 state->buflen = BLAKE2B_BLOCK_SIZE;
 64         }
 65 }
 66 
 67 #endif /* _CRYPTO_BLAKE2B_H */
 68 

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