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/bug.h> 13 #include <linux/export.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/string.h> 18 #include <linux/types.h> 19 20 static inline void blake2s_set_lastblock(struct blake2s_state *state) 21 { 22 state->f[0] = -1; 23 } 24 25 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen) 26 { 27 const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen; 28 29 if (unlikely(!inlen)) 30 return; 31 if (inlen > fill) { 32 memcpy(state->buf + state->buflen, in, fill); 33 blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE); 34 state->buflen = 0; 35 in += fill; 36 inlen -= fill; 37 } 38 if (inlen > BLAKE2S_BLOCK_SIZE) { 39 const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE); 40 blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE); 41 in += BLAKE2S_BLOCK_SIZE * (nblocks - 1); 42 inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1); 43 } 44 memcpy(state->buf + state->buflen, in, inlen); 45 state->buflen += inlen; 46 } 47 EXPORT_SYMBOL(blake2s_update); 48 49 void blake2s_final(struct blake2s_state *state, u8 *out) 50 { 51 WARN_ON(IS_ENABLED(DEBUG) && !out); 52 blake2s_set_lastblock(state); 53 memset(state->buf + state->buflen, 0, 54 BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */ 55 blake2s_compress(state, state->buf, 1, state->buflen); 56 cpu_to_le32_array(state->h, ARRAY_SIZE(state->h)); 57 memcpy(out, state->h, state->outlen); 58 memzero_explicit(state, sizeof(*state)); 59 } 60 EXPORT_SYMBOL(blake2s_final); 61 62 static int __init blake2s_mod_init(void) 63 { 64 if (IS_ENABLED(CONFIG_CRYPTO_SELFTESTS) && 65 WARN_ON(!blake2s_selftest())) 66 return -ENODEV; 67 return 0; 68 } 69 70 module_init(blake2s_mod_init); 71 MODULE_DESCRIPTION("BLAKE2s hash function"); 72 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>"); 73