linux-stable/crypto/sha256_generic.c
Eric Biggers a24d22b225 crypto: sha - split sha.h into sha1.h and sha2.h
Currently <crypto/sha.h> contains declarations for both SHA-1 and SHA-2,
and <crypto/sha3.h> contains declarations for SHA-3.

This organization is inconsistent, but more importantly SHA-1 is no
longer considered to be cryptographically secure.  So to the extent
possible, SHA-1 shouldn't be grouped together with any of the other SHA
versions, and usage of it should be phased out.

Therefore, split <crypto/sha.h> into two headers <crypto/sha1.h> and
<crypto/sha2.h>, and make everyone explicitly specify whether they want
the declarations for SHA-1, SHA-2, or both.

This avoids making the SHA-1 declarations visible to files that don't
want anything to do with SHA-1.  It also prepares for potentially moving
sha1.h into a new insecure/ or dangerous/ directory.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-11-20 14:45:33 +11:00

122 lines
3.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Crypto API wrapper for the generic SHA256 code from lib/crypto/sha256.c
*
* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
*/
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/sha2.h>
#include <crypto/sha256_base.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
0x2f
};
EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
};
EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
static int crypto_sha256_init(struct shash_desc *desc)
{
sha256_init(shash_desc_ctx(desc));
return 0;
}
static int crypto_sha224_init(struct shash_desc *desc)
{
sha224_init(shash_desc_ctx(desc));
return 0;
}
int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
sha256_update(shash_desc_ctx(desc), data, len);
return 0;
}
EXPORT_SYMBOL(crypto_sha256_update);
static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
{
if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
sha224_final(shash_desc_ctx(desc), out);
else
sha256_final(shash_desc_ctx(desc), out);
return 0;
}
int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *hash)
{
sha256_update(shash_desc_ctx(desc), data, len);
return crypto_sha256_final(desc, hash);
}
EXPORT_SYMBOL(crypto_sha256_finup);
static struct shash_alg sha256_algs[2] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = crypto_sha256_init,
.update = crypto_sha256_update,
.final = crypto_sha256_final,
.finup = crypto_sha256_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name= "sha256-generic",
.cra_priority = 100,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = crypto_sha224_init,
.update = crypto_sha256_update,
.final = crypto_sha256_final,
.finup = crypto_sha256_finup,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name= "sha224-generic",
.cra_priority = 100,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int __init sha256_generic_mod_init(void)
{
return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
}
static void __exit sha256_generic_mod_fini(void)
{
crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
}
subsys_initcall(sha256_generic_mod_init);
module_exit(sha256_generic_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
MODULE_ALIAS_CRYPTO("sha224");
MODULE_ALIAS_CRYPTO("sha224-generic");
MODULE_ALIAS_CRYPTO("sha256");
MODULE_ALIAS_CRYPTO("sha256-generic");