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 static inline void blake2s_set_lastblock(struct blake2s_state *state) 20 { 21 state->f[0] = -1; 22 } 23 24 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen) 25 { 26 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen; 27 28 if (unlikely(!inlen)) 29 return; 30 if (inlen > fill) { 31 memcpy(state->buf + state->buflen, in, fill); 32 blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE); 33 state->buflen = 0; 34 in += fill; 35 inlen -= fill; 36 } 37 if (inlen > BLAKE2S_BLOCK_SIZE) { 38 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE); 39 blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE); 40 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1); 41 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1); 42 } 43 memcpy(state->buf + state->buflen, in, inlen); 44 state->buflen += inlen; 45 } 46 EXPORT_SYMBOL(blake2s_update); 47 48 void blake2s_final(struct blake2s_state *state, u8 *out) 49 { 50 WARN_ON(IS_ENABLED(DEBUG) && !out); 51 blake2s_set_lastblock(state); 52 memset(state->buf + state->buflen, 0, 53 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */ 54 blake2s_compress(state, state->buf, 1, state->buflen); 55 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h)); 56 memcpy(out, state->h, state->outlen); 57 memzero_explicit(state, sizeof(*state)); 58 } 59 EXPORT_SYMBOL(blake2s_final); 60 61 static int __init blake2s_mod_init(void) 62 { 63 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) && 64 WARN_ON(!blake2s_selftest())) 65 return -ENODEV; 66 return 0; 67 } 68 69 module_init(blake2s_mod_init); 70 MODULE_DESCRIPTION("BLAKE2s hash function"); 71 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>"); 72