[linux.git] / crypto / blake2s_generic.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
 * Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
 */

#include <crypto/internal/blake2s.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/hash.h>

#include <linux/types.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>

static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
				 unsigned int keylen)
{
	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);

	if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
		return -EINVAL;

	memcpy(tctx->key, key, keylen);
	tctx->keylen = keylen;

	return 0;
}

static int crypto_blake2s_init(struct shash_desc *desc)
{
	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	struct blake2s_state *state = shash_desc_ctx(desc);
	const int outlen = crypto_shash_digestsize(desc->tfm);

	if (tctx->keylen)
		blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
	else
		blake2s_init(state, outlen);

	return 0;
}

static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
				 unsigned int inlen)
{
	struct blake2s_state *state = shash_desc_ctx(desc);
	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;

	if (unlikely(!inlen))
		return 0;
	if (inlen > fill) {
		memcpy(state->buf + state->buflen, in, fill);
		blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
		state->buflen = 0;
		in += fill;
		inlen -= fill;
	}
	if (inlen > BLAKE2S_BLOCK_SIZE) {
		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
		/* Hash one less (full) block than strictly possible */
		blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
		in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
		inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
	}
	memcpy(state->buf + state->buflen, in, inlen);
	state->buflen += inlen;

	return 0;
}

static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
{
	struct blake2s_state *state = shash_desc_ctx(desc);

	blake2s_set_lastblock(state);
	memset(state->buf + state->buflen, 0,
	       BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
	blake2s_compress_generic(state, state->buf, 1, state->buflen);
	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
	memcpy(out, state->h, state->outlen);
	memzero_explicit(state, sizeof(*state));

	return 0;
}

static struct shash_alg blake2s_algs[] = {{
	.base.cra_name		= "blake2s-128",
	.base.cra_driver_name	= "blake2s-128-generic",
	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),
	.base.cra_priority	= 200,
	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,

	.digestsize		= BLAKE2S_128_HASH_SIZE,
	.setkey			= crypto_blake2s_setkey,
	.init			= crypto_blake2s_init,
	.update			= crypto_blake2s_update,
	.final			= crypto_blake2s_final,
	.descsize		= sizeof(struct blake2s_state),
}, {
	.base.cra_name		= "blake2s-160",
	.base.cra_driver_name	= "blake2s-160-generic",
	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),
	.base.cra_priority	= 200,
	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,

	.digestsize		= BLAKE2S_160_HASH_SIZE,
	.setkey			= crypto_blake2s_setkey,
	.init			= crypto_blake2s_init,
	.update			= crypto_blake2s_update,
	.final			= crypto_blake2s_final,
	.descsize		= sizeof(struct blake2s_state),
}, {
	.base.cra_name		= "blake2s-224",
	.base.cra_driver_name	= "blake2s-224-generic",
	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),
	.base.cra_priority	= 200,
	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,

	.digestsize		= BLAKE2S_224_HASH_SIZE,
	.setkey			= crypto_blake2s_setkey,
	.init			= crypto_blake2s_init,
	.update			= crypto_blake2s_update,
	.final			= crypto_blake2s_final,
	.descsize		= sizeof(struct blake2s_state),
}, {
	.base.cra_name		= "blake2s-256",
	.base.cra_driver_name	= "blake2s-256-generic",
	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),
	.base.cra_priority	= 200,
	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,

	.digestsize		= BLAKE2S_256_HASH_SIZE,
	.setkey			= crypto_blake2s_setkey,
	.init			= crypto_blake2s_init,
	.update			= crypto_blake2s_update,
	.final			= crypto_blake2s_final,
	.descsize		= sizeof(struct blake2s_state),
}};

static int __init blake2s_mod_init(void)
{
	return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
}

static void __exit blake2s_mod_exit(void)
{
	crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
}

subsys_initcall(blake2s_mod_init);
module_exit(blake2s_mod_exit);

MODULE_ALIAS_CRYPTO("blake2s-128");
MODULE_ALIAS_CRYPTO("blake2s-128-generic");
MODULE_ALIAS_CRYPTO("blake2s-160");
MODULE_ALIAS_CRYPTO("blake2s-160-generic");
MODULE_ALIAS_CRYPTO("blake2s-224");
MODULE_ALIAS_CRYPTO("blake2s-224-generic");
MODULE_ALIAS_CRYPTO("blake2s-256");
MODULE_ALIAS_CRYPTO("blake2s-256-generic");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
7f9b0880 AB	1	// SPDX-License-Identifier: GPL-2.0 OR MIT
	2	/*
	3	* Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
	4	*/
	5
	6	#include <crypto/internal/blake2s.h>
	7	#include <crypto/internal/simd.h>
	8	#include <crypto/internal/hash.h>
	9
	10	#include <linux/types.h>
	11	#include <linux/jump_label.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14
	15	static int crypto_blake2s_setkey(struct crypto_shash tfm, const u8 key,
	16	unsigned int keylen)
	17	{
	18	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
	19
674f368a	20	if (keylen == 0 \|\| keylen > BLAKE2S_KEY_SIZE)
7f9b0880	21	return -EINVAL;
7f9b0880 AB	22
	23	memcpy(tctx->key, key, keylen);
	24	tctx->keylen = keylen;
	25
	26	return 0;
	27	}
	28
	29	static int crypto_blake2s_init(struct shash_desc *desc)
	30	{
	31	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	32	struct blake2s_state *state = shash_desc_ctx(desc);
	33	const int outlen = crypto_shash_digestsize(desc->tfm);
	34
	35	if (tctx->keylen)
	36	blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
	37	else
	38	blake2s_init(state, outlen);
	39
	40	return 0;
	41	}
	42
	43	static int crypto_blake2s_update(struct shash_desc desc, const u8 in,
	44	unsigned int inlen)
	45	{
	46	struct blake2s_state *state = shash_desc_ctx(desc);
	47	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
	48
	49	if (unlikely(!inlen))
	50	return 0;
	51	if (inlen > fill) {
	52	memcpy(state->buf + state->buflen, in, fill);
	53	blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
	54	state->buflen = 0;
	55	in += fill;
	56	inlen -= fill;
	57	}
	58	if (inlen > BLAKE2S_BLOCK_SIZE) {
	59	const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
	60	/* Hash one less (full) block than strictly possible */
	61	blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
	62	in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
	63	inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
	64	}
	65	memcpy(state->buf + state->buflen, in, inlen);
	66	state->buflen += inlen;
	67
	68	return 0;
	69	}
	70
	71	static int crypto_blake2s_final(struct shash_desc desc, u8 out)
	72	{
	73	struct blake2s_state *state = shash_desc_ctx(desc);
	74
	75	blake2s_set_lastblock(state);
	76	memset(state->buf + state->buflen, 0,
	77	BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
	78	blake2s_compress_generic(state, state->buf, 1, state->buflen);
	79	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
	80	memcpy(out, state->h, state->outlen);
	81	memzero_explicit(state, sizeof(*state));
	82
	83	return 0;
	84	}
	85
86	static struct shash_alg blake2s_algs[] = {{
87	.base.cra_name = "blake2s-128",
88	.base.cra_driver_name = "blake2s-128-generic",
89	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
90	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
91	.base.cra_priority = 200,
92	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
93	.base.cra_module = THIS_MODULE,
94
95	.digestsize = BLAKE2S_128_HASH_SIZE,
96	.setkey = crypto_blake2s_setkey,
97	.init = crypto_blake2s_init,
98	.update = crypto_blake2s_update,
99	.final = crypto_blake2s_final,
100	.descsize = sizeof(struct blake2s_state),
101	}, {
102	.base.cra_name = "blake2s-160",
103	.base.cra_driver_name = "blake2s-160-generic",
104	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
105	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
106	.base.cra_priority = 200,
107	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
108	.base.cra_module = THIS_MODULE,
109
110	.digestsize = BLAKE2S_160_HASH_SIZE,
111	.setkey = crypto_blake2s_setkey,
112	.init = crypto_blake2s_init,
113	.update = crypto_blake2s_update,
114	.final = crypto_blake2s_final,
115	.descsize = sizeof(struct blake2s_state),
116	}, {
117	.base.cra_name = "blake2s-224",
118	.base.cra_driver_name = "blake2s-224-generic",
119	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
120	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
121	.base.cra_priority = 200,
122	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
123	.base.cra_module = THIS_MODULE,
124
125	.digestsize = BLAKE2S_224_HASH_SIZE,
126	.setkey = crypto_blake2s_setkey,
127	.init = crypto_blake2s_init,
128	.update = crypto_blake2s_update,
129	.final = crypto_blake2s_final,
130	.descsize = sizeof(struct blake2s_state),
131	}, {
132	.base.cra_name = "blake2s-256",
133	.base.cra_driver_name = "blake2s-256-generic",
134	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
135	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
136	.base.cra_priority = 200,
137	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
138	.base.cra_module = THIS_MODULE,
139
140	.digestsize = BLAKE2S_256_HASH_SIZE,
141	.setkey = crypto_blake2s_setkey,
142	.init = crypto_blake2s_init,
143	.update = crypto_blake2s_update,
144	.final = crypto_blake2s_final,
145	.descsize = sizeof(struct blake2s_state),
146	}};
147
148	static int __init blake2s_mod_init(void)
149	{
150	return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
151	}
152
153	static void __exit blake2s_mod_exit(void)
154	{
155	crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
156	}
157
158	subsys_initcall(blake2s_mod_init);
159	module_exit(blake2s_mod_exit);
160
161	MODULE_ALIAS_CRYPTO("blake2s-128");
162	MODULE_ALIAS_CRYPTO("blake2s-128-generic");
163	MODULE_ALIAS_CRYPTO("blake2s-160");
164	MODULE_ALIAS_CRYPTO("blake2s-160-generic");
165	MODULE_ALIAS_CRYPTO("blake2s-224");
166	MODULE_ALIAS_CRYPTO("blake2s-224-generic");
167	MODULE_ALIAS_CRYPTO("blake2s-256");
168	MODULE_ALIAS_CRYPTO("blake2s-256-generic");
169	MODULE_LICENSE("GPL v2");