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 #if IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_BLAKE2S) 20 # define blake2s_compress blake2s_compress_arch 21 #else 22 # define blake2s_compress blake2s_compress_generic 23 #endif 24 25 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen) 26 { 27 __blake2s_update(state, in, inlen, blake2s_compress); 28 } 29 EXPORT_SYMBOL(blake2s_update); 30 31 void blake2s_final(struct blake2s_state *state, u8 *out) 32 { 33 WARN_ON(IS_ENABLED(DEBUG) && !out); 34 __blake2s_final(state, out, blake2s_compress); 35 memzero_explicit(state, sizeof(*state)); 36 } 37 EXPORT_SYMBOL(blake2s_final); 38 39 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen, 40 const size_t keylen) 41 { 42 struct blake2s_state state; 43 u8 x_key[BLAKE2S_BLOCK_SIZE] __aligned(__alignof__(u32)) = { 0 }; 44 u8 i_hash[BLAKE2S_HASH_SIZE] __aligned(__alignof__(u32)); 45 int i; 46 47 if (keylen > BLAKE2S_BLOCK_SIZE) { 48 blake2s_init(&state, BLAKE2S_HASH_SIZE); 49 blake2s_update(&state, key, keylen); 50 blake2s_final(&state, x_key); 51 } else 52 memcpy(x_key, key, keylen); 53 54 for (i = 0; i < BLAKE2S_BLOCK_SIZE; ++i) 55 x_key[i] ^= 0x36; 56 57 blake2s_init(&state, BLAKE2S_HASH_SIZE); 58 blake2s_update(&state, x_key, BLAKE2S_BLOCK_SIZE); 59 blake2s_update(&state, in, inlen); 60 blake2s_final(&state, i_hash); 61 62 for (i = 0; i < BLAKE2S_BLOCK_SIZE; ++i) 63 x_key[i] ^= 0x5c ^ 0x36; 64 65 blake2s_init(&state, BLAKE2S_HASH_SIZE); 66 blake2s_update(&state, x_key, BLAKE2S_BLOCK_SIZE); 67 blake2s_update(&state, i_hash, BLAKE2S_HASH_SIZE); 68 blake2s_final(&state, i_hash); 69 70 memcpy(out, i_hash, BLAKE2S_HASH_SIZE); 71 memzero_explicit(x_key, BLAKE2S_BLOCK_SIZE); 72 memzero_explicit(i_hash, BLAKE2S_HASH_SIZE); 73 } 74 EXPORT_SYMBOL(blake2s256_hmac); 75 76 static int __init mod_init(void) 77 { 78 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) && 79 WARN_ON(!blake2s_selftest())) 80 return -ENODEV; 81 return 0; 82 } 83 84 static void __exit mod_exit(void) 85 { 86 } 87 88 module_init(mod_init); 89 module_exit(mod_exit); 90 MODULE_LICENSE("GPL v2"); 91 MODULE_DESCRIPTION("BLAKE2s hash function"); 92 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>"); 93