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crypto: salsa20 - Revert "crypto: salsa20 - export generic helpers"

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This reverts commit eb772f37ae, as now the
x86 Salsa20 implementation has been removed and the generic helpers are
no longer needed outside of salsa20_generic.c.

We could keep this just in case someone else wants to add a new
optimized Salsa20 implementation.  But given that we have ChaCha20 now
too, I think it's unlikely.  And this can always be reverted back.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2018-05-26 00:08:59 -07:00 committed by Herbert Xu
parent b7b73cd5d7
commit 015a03704d
2 changed files with 13 additions and 34 deletions
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20
crypto/salsa20_generic.c
View File

@ -21,9 +21,17 @@
#include <asm/unaligned.h>
#include <crypto/internal/skcipher.h>
#include <crypto/salsa20.h>
#include <linux/module.h>
#define SALSA20_IV_SIZE 8
#define SALSA20_MIN_KEY_SIZE 16
#define SALSA20_MAX_KEY_SIZE 32
#define SALSA20_BLOCK_SIZE 64
struct salsa20_ctx {
u32 initial_state[16];
};
static void salsa20_block(u32 *state, __le32 *stream)
{
u32 x[16];
@ -93,16 +101,15 @@ static void salsa20_docrypt(u32 *state, u8 *dst, const u8 *src,
}
}
void crypto_salsa20_init(u32 *state, const struct salsa20_ctx *ctx,
static void salsa20_init(u32 *state, const struct salsa20_ctx *ctx,
const u8 *iv)
{
memcpy(state, ctx->initial_state, sizeof(ctx->initial_state));
state[6] = get_unaligned_le32(iv + 0);
state[7] = get_unaligned_le32(iv + 4);
}
EXPORT_SYMBOL_GPL(crypto_salsa20_init);
int crypto_salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key,
static int salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keysize)
{
static const char sigma[16] = "expand 32-byte k";
@ -143,7 +150,6 @@ int crypto_salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key,
return 0;
}
EXPORT_SYMBOL_GPL(crypto_salsa20_setkey);
static int salsa20_crypt(struct skcipher_request *req)
{
@ -155,7 +161,7 @@ static int salsa20_crypt(struct skcipher_request *req)
err = skcipher_walk_virt(&walk, req, true);
crypto_salsa20_init(state, ctx, walk.iv);
salsa20_init(state, ctx, walk.iv);
while (walk.nbytes > 0) {
unsigned int nbytes = walk.nbytes;
@ -183,7 +189,7 @@ static struct skcipher_alg alg = {
.max_keysize = SALSA20_MAX_KEY_SIZE,
.ivsize = SALSA20_IV_SIZE,
.chunksize = SALSA20_BLOCK_SIZE,
.setkey = crypto_salsa20_setkey,
.setkey = salsa20_setkey,
.encrypt = salsa20_crypt,
.decrypt = salsa20_crypt,
};

27
include/crypto/salsa20.h
View File

@ -1,27 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Common values for the Salsa20 algorithm
*/
#ifndef _CRYPTO_SALSA20_H
#define _CRYPTO_SALSA20_H
#include <linux/types.h>
#define SALSA20_IV_SIZE 8
#define SALSA20_MIN_KEY_SIZE 16
#define SALSA20_MAX_KEY_SIZE 32
#define SALSA20_BLOCK_SIZE 64
struct crypto_skcipher;
struct salsa20_ctx {
u32 initial_state[16];
};
void crypto_salsa20_init(u32 *state, const struct salsa20_ctx *ctx,
const u8 *iv);
int crypto_salsa20_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keysize);
#endif /* _CRYPTO_SALSA20_H */