mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-29 20:30:35 +00:00
![Eric Biggers](/assets/img/avatar_default.png)
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>
149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Cryptographic API.
|
|
*
|
|
* powerpc implementation of the SHA1 Secure Hash Algorithm.
|
|
*
|
|
* Derived from cryptoapi implementation, adapted for in-place
|
|
* scatterlist interface.
|
|
*
|
|
* Derived from "crypto/sha1.c"
|
|
* Copyright (c) Alan Smithee.
|
|
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
|
|
* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
|
|
*/
|
|
#include <crypto/internal/hash.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/types.h>
|
|
#include <crypto/sha1.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
void powerpc_sha_transform(u32 *state, const u8 *src);
|
|
|
|
static int powerpc_sha1_init(struct shash_desc *desc)
|
|
{
|
|
struct sha1_state *sctx = shash_desc_ctx(desc);
|
|
|
|
*sctx = (struct sha1_state){
|
|
.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len)
|
|
{
|
|
struct sha1_state *sctx = shash_desc_ctx(desc);
|
|
unsigned int partial, done;
|
|
const u8 *src;
|
|
|
|
partial = sctx->count & 0x3f;
|
|
sctx->count += len;
|
|
done = 0;
|
|
src = data;
|
|
|
|
if ((partial + len) > 63) {
|
|
|
|
if (partial) {
|
|
done = -partial;
|
|
memcpy(sctx->buffer + partial, data, done + 64);
|
|
src = sctx->buffer;
|
|
}
|
|
|
|
do {
|
|
powerpc_sha_transform(sctx->state, src);
|
|
done += 64;
|
|
src = data + done;
|
|
} while (done + 63 < len);
|
|
|
|
partial = 0;
|
|
}
|
|
memcpy(sctx->buffer + partial, src, len - done);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Add padding and return the message digest. */
|
|
static int powerpc_sha1_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct sha1_state *sctx = shash_desc_ctx(desc);
|
|
__be32 *dst = (__be32 *)out;
|
|
u32 i, index, padlen;
|
|
__be64 bits;
|
|
static const u8 padding[64] = { 0x80, };
|
|
|
|
bits = cpu_to_be64(sctx->count << 3);
|
|
|
|
/* Pad out to 56 mod 64 */
|
|
index = sctx->count & 0x3f;
|
|
padlen = (index < 56) ? (56 - index) : ((64+56) - index);
|
|
powerpc_sha1_update(desc, padding, padlen);
|
|
|
|
/* Append length */
|
|
powerpc_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
|
|
|
|
/* Store state in digest */
|
|
for (i = 0; i < 5; i++)
|
|
dst[i] = cpu_to_be32(sctx->state[i]);
|
|
|
|
/* Wipe context */
|
|
memset(sctx, 0, sizeof *sctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int powerpc_sha1_export(struct shash_desc *desc, void *out)
|
|
{
|
|
struct sha1_state *sctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(out, sctx, sizeof(*sctx));
|
|
return 0;
|
|
}
|
|
|
|
static int powerpc_sha1_import(struct shash_desc *desc, const void *in)
|
|
{
|
|
struct sha1_state *sctx = shash_desc_ctx(desc);
|
|
|
|
memcpy(sctx, in, sizeof(*sctx));
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg alg = {
|
|
.digestsize = SHA1_DIGEST_SIZE,
|
|
.init = powerpc_sha1_init,
|
|
.update = powerpc_sha1_update,
|
|
.final = powerpc_sha1_final,
|
|
.export = powerpc_sha1_export,
|
|
.import = powerpc_sha1_import,
|
|
.descsize = sizeof(struct sha1_state),
|
|
.statesize = sizeof(struct sha1_state),
|
|
.base = {
|
|
.cra_name = "sha1",
|
|
.cra_driver_name= "sha1-powerpc",
|
|
.cra_blocksize = SHA1_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init sha1_powerpc_mod_init(void)
|
|
{
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
|
|
static void __exit sha1_powerpc_mod_fini(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(sha1_powerpc_mod_init);
|
|
module_exit(sha1_powerpc_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
|
|
|
|
MODULE_ALIAS_CRYPTO("sha1");
|
|
MODULE_ALIAS_CRYPTO("sha1-powerpc");
|