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 * This is an implementation of the BLAKE2s hash and PRF functions. 6 * 7 * Information: https://blake2.net/ 8 * 9 */ 10 11 #include <crypto/internal/blake2s.h> 12 #include <linux/types.h> 13 #include <linux/string.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/bug.h> 18 19 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen) 20 { 21 __blake2s_update(state, in, inlen, blake2s_compress); 22 } 23 EXPORT_SYMBOL(blake2s_update); 24 25 void blake2s_final(struct blake2s_state *state, u8 *out) 26 { 27 WARN_ON(IS_ENABLED(DEBUG) && !out); 28 __blake2s_final(state, out, blake2s_compress); 29 memzero_explicit(state, sizeof(*state)); 30 } 31 EXPORT_SYMBOL(blake2s_final); 32 33 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen, 34 const size_t keylen) 35 { 36 struct blake2s_state state; 37 u8 x_key[BLAKE2S_BLOCK_SIZE] __aligned(__alignof__(u32)) = { 0 }; 38 u8 i_hash[BLAKE2S_HASH_SIZE] __aligned(__alignof__(u32)); 39 int i; 40 41 if (keylen > BLAKE2S_BLOCK_SIZE) { 42 blake2s_init(&state, BLAKE2S_HASH_SIZE); 43 blake2s_update(&state, key, keylen); 44 blake2s_final(&state, x_key); 45 } else 46 memcpy(x_key, key, keylen); 47 48 for (i = 0; i < BLAKE2S_BLOCK_SIZE; ++i) 49 x_key[i] ^= 0x36; 50 51 blake2s_init(&state, BLAKE2S_HASH_SIZE); 52 blake2s_update(&state, x_key, BLAKE2S_BLOCK_SIZE); 53 blake2s_update(&state, in, inlen); 54 blake2s_final(&state, i_hash); 55 56 for (i = 0; i < BLAKE2S_BLOCK_SIZE; ++i) 57 x_key[i] ^= 0x5c ^ 0x36; 58 59 blake2s_init(&state, BLAKE2S_HASH_SIZE); 60 blake2s_update(&state, x_key, BLAKE2S_BLOCK_SIZE); 61 blake2s_update(&state, i_hash, BLAKE2S_HASH_SIZE); 62 blake2s_final(&state, i_hash); 63 64 memcpy(out, i_hash, BLAKE2S_HASH_SIZE); 65 memzero_explicit(x_key, BLAKE2S_BLOCK_SIZE); 66 memzero_explicit(i_hash, BLAKE2S_HASH_SIZE); 67 } 68 EXPORT_SYMBOL(blake2s256_hmac); 69 70 static int __init blake2s_mod_init(void) 71 { 72 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) && 73 WARN_ON(!blake2s_selftest())) 74 return -ENODEV; 75 return 0; 76 } 77 78 static void __exit blake2s_mod_exit(void) 79 { 80 } 81 82 module_init(blake2s_mod_init); 83 module_exit(blake2s_mod_exit); 84 MODULE_LICENSE("GPL v2"); 85 MODULE_DESCRIPTION("BLAKE2s hash function"); 86 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>"); 87