[linux-2.6-block.git] / crypto / blake2s_generic.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. 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) {
		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		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 <Jason@zx2c4.com>. 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
	20	if (keylen == 0 \|\| keylen > BLAKE2S_KEY_SIZE) {
	21	crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	22	return -EINVAL;
	23	}
	24
	25	memcpy(tctx->key, key, keylen);
	26	tctx->keylen = keylen;
	27
	28	return 0;
	29	}
	30
	31	static int crypto_blake2s_init(struct shash_desc *desc)
	32	{
	33	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	34	struct blake2s_state *state = shash_desc_ctx(desc);
	35	const int outlen = crypto_shash_digestsize(desc->tfm);
	36
	37	if (tctx->keylen)
	38	blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
	39	else
	40	blake2s_init(state, outlen);
	41
	42	return 0;
	43	}
	44
	45	static int crypto_blake2s_update(struct shash_desc desc, const u8 in,
	46	unsigned int inlen)
	47	{
	48	struct blake2s_state *state = shash_desc_ctx(desc);
	49	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
	50
	51	if (unlikely(!inlen))
	52	return 0;
	53	if (inlen > fill) {
	54	memcpy(state->buf + state->buflen, in, fill);
	55	blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
	56	state->buflen = 0;
	57	in += fill;
	58	inlen -= fill;
	59	}
	60	if (inlen > BLAKE2S_BLOCK_SIZE) {
	61	const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
	62	/* Hash one less (full) block than strictly possible */
	63	blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
	64	in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
65	inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
66	}
67	memcpy(state->buf + state->buflen, in, inlen);
68	state->buflen += inlen;
69
70	return 0;
71	}
72
73	static int crypto_blake2s_final(struct shash_desc desc, u8 out)
74	{
75	struct blake2s_state *state = shash_desc_ctx(desc);
76
77	blake2s_set_lastblock(state);
78	memset(state->buf + state->buflen, 0,
79	BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
80	blake2s_compress_generic(state, state->buf, 1, state->buflen);
81	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
82	memcpy(out, state->h, state->outlen);
83	memzero_explicit(state, sizeof(*state));
84
85	return 0;
86	}
87
88	static struct shash_alg blake2s_algs[] = {{
89	.base.cra_name = "blake2s-128",
90	.base.cra_driver_name = "blake2s-128-generic",
91	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
92	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
93	.base.cra_priority = 200,
94	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
95	.base.cra_module = THIS_MODULE,
96
97	.digestsize = BLAKE2S_128_HASH_SIZE,
98	.setkey = crypto_blake2s_setkey,
99	.init = crypto_blake2s_init,
100	.update = crypto_blake2s_update,
101	.final = crypto_blake2s_final,
102	.descsize = sizeof(struct blake2s_state),
103	}, {
104	.base.cra_name = "blake2s-160",
105	.base.cra_driver_name = "blake2s-160-generic",
106	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
107	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
108	.base.cra_priority = 200,
109	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
110	.base.cra_module = THIS_MODULE,
111
112	.digestsize = BLAKE2S_160_HASH_SIZE,
113	.setkey = crypto_blake2s_setkey,
114	.init = crypto_blake2s_init,
115	.update = crypto_blake2s_update,
116	.final = crypto_blake2s_final,
117	.descsize = sizeof(struct blake2s_state),
118	}, {
119	.base.cra_name = "blake2s-224",
120	.base.cra_driver_name = "blake2s-224-generic",
121	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
122	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
123	.base.cra_priority = 200,
124	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
125	.base.cra_module = THIS_MODULE,
126
127	.digestsize = BLAKE2S_224_HASH_SIZE,
128	.setkey = crypto_blake2s_setkey,
129	.init = crypto_blake2s_init,
130	.update = crypto_blake2s_update,
131	.final = crypto_blake2s_final,
132	.descsize = sizeof(struct blake2s_state),
133	}, {
134	.base.cra_name = "blake2s-256",
135	.base.cra_driver_name = "blake2s-256-generic",
136	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
137	.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx),
138	.base.cra_priority = 200,
139	.base.cra_blocksize = BLAKE2S_BLOCK_SIZE,
140	.base.cra_module = THIS_MODULE,
141
142	.digestsize = BLAKE2S_256_HASH_SIZE,
143	.setkey = crypto_blake2s_setkey,
144	.init = crypto_blake2s_init,
145	.update = crypto_blake2s_update,
146	.final = crypto_blake2s_final,
147	.descsize = sizeof(struct blake2s_state),
148	}};
149
150	static int __init blake2s_mod_init(void)
151	{
152	return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
153	}
154
155	static void __exit blake2s_mod_exit(void)
156	{
157	crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
158	}
159
160	subsys_initcall(blake2s_mod_init);
161	module_exit(blake2s_mod_exit);
162
163	MODULE_ALIAS_CRYPTO("blake2s-128");
164	MODULE_ALIAS_CRYPTO("blake2s-128-generic");
165	MODULE_ALIAS_CRYPTO("blake2s-160");
166	MODULE_ALIAS_CRYPTO("blake2s-160-generic");
167	MODULE_ALIAS_CRYPTO("blake2s-224");
168	MODULE_ALIAS_CRYPTO("blake2s-224-generic");
169	MODULE_ALIAS_CRYPTO("blake2s-256");
170	MODULE_ALIAS_CRYPTO("blake2s-256-generic");
171	MODULE_LICENSE("GPL v2");