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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Crypto API support for BLAKE2b
*
* Copyright 2025 Google LLC
*/
#include <crypto/blake2b.h>
#include <crypto/internal/hash.h>
#include <linux/kernel.h>
#include <linux/module.h>
struct blake2b_tfm_ctx {
unsigned int keylen;
u8 key[BLAKE2B_KEY_SIZE];
};
static int crypto_blake2b_setkey(struct crypto_shash *tfm,
const u8 *key, unsigned int keylen)
{
struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
if (keylen > BLAKE2B_KEY_SIZE)
return -EINVAL;
memcpy(tctx->key, key, keylen);
tctx->keylen = keylen;
return 0;
}
#define BLAKE2B_CTX(desc) ((struct blake2b_ctx *)shash_desc_ctx(desc))
static int crypto_blake2b_init(struct shash_desc *desc)
{
const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
unsigned int digestsize = crypto_shash_digestsize(desc->tfm);
blake2b_init_key(BLAKE2B_CTX(desc), digestsize,
tctx->key, tctx->keylen);
return 0;
}
static int crypto_blake2b_update(struct shash_desc *desc,
const u8 *data, unsigned int len)
{
blake2b_update(BLAKE2B_CTX(desc), data, len);
return 0;
}
static int crypto_blake2b_final(struct shash_desc *desc, u8 *out)
{
blake2b_final(BLAKE2B_CTX(desc), out);
return 0;
}
static int crypto_blake2b_digest(struct shash_desc *desc,
const u8 *data, unsigned int len, u8 *out)
{
const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
unsigned int digestsize = crypto_shash_digestsize(desc->tfm);
blake2b(tctx->key, tctx->keylen, data, len, out, digestsize);
return 0;
}
#define BLAKE2B_ALG(name, digest_size) \
{ \
.base.cra_name = name, \
.base.cra_driver_name = name "-lib", \
.base.cra_priority = 300, \
.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, \
.base.cra_blocksize = BLAKE2B_BLOCK_SIZE, \
.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \
.base.cra_module = THIS_MODULE, \
.digestsize = digest_size, \
.setkey = crypto_blake2b_setkey, \
.init = crypto_blake2b_init, \
.update = crypto_blake2b_update, \
.final = crypto_blake2b_final, \
.digest = crypto_blake2b_digest, \
.descsize = sizeof(struct blake2b_ctx), \
}
static struct shash_alg algs[] = {
BLAKE2B_ALG("blake2b-160", BLAKE2B_160_HASH_SIZE),
BLAKE2B_ALG("blake2b-256", BLAKE2B_256_HASH_SIZE),
BLAKE2B_ALG("blake2b-384", BLAKE2B_384_HASH_SIZE),
BLAKE2B_ALG("blake2b-512", BLAKE2B_512_HASH_SIZE),
};
static int __init crypto_blake2b_mod_init(void)
{
return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}
module_init(crypto_blake2b_mod_init);
static void __exit crypto_blake2b_mod_exit(void)
{
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
module_exit(crypto_blake2b_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crypto API support for BLAKE2b");
MODULE_ALIAS_CRYPTO("blake2b-160");
MODULE_ALIAS_CRYPTO("blake2b-160-lib");
MODULE_ALIAS_CRYPTO("blake2b-256");
MODULE_ALIAS_CRYPTO("blake2b-256-lib");
MODULE_ALIAS_CRYPTO("blake2b-384");
MODULE_ALIAS_CRYPTO("blake2b-384-lib");
MODULE_ALIAS_CRYPTO("blake2b-512");
MODULE_ALIAS_CRYPTO("blake2b-512-lib");
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