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crypto: serpent - export common functions for x86_64/i386-sse2 assembler implementations 

Serpent SSE2 assembler implementations only provide 4-way/8-way parallel
functions and need setkey and one-block encrypt/decrypt functions.

CC: Dag Arne Osvik <osvik@ii.uib.no>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jussi Kivilinna 2011-10-18 00:03:08 +03:00 committed by Herbert Xu
parent 7fb7fe4469
commit bc83b8299c
2 changed files with 47 additions and 19 deletions
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41
crypto/serpent.c
View File

@ -21,16 +21,12 @@
#include <asm/byteorder.h>
#include <linux/crypto.h>
#include <linux/types.h>
#include <crypto/serpent.h>
/* Key is padded to the maximum of 256 bits before round key generation.
* Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
*/
#define SERPENT_MIN_KEY_SIZE 0
#define SERPENT_MAX_KEY_SIZE 32
#define SERPENT_EXPKEY_WORDS 132
#define SERPENT_BLOCK_SIZE 16
#define PHI 0x9e3779b9UL
#define keyiter(a,b,c,d,i,j) \
@ -210,13 +206,7 @@
x1 ^= x4; x3 ^= x4; x4 &= x0; \
x4 ^= x2;
struct serpent_ctx {
u32 expkey[SERPENT_EXPKEY_WORDS];
};
static int serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
u32 *k = ctx->expkey;
@ -359,12 +349,11 @@ static int serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
return 0;
}
EXPORT_SYMBOL_GPL(serpent_setkey);
static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
{
struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
const u32
*k = ctx->expkey;
const u32 *k = ctx->expkey;
const __le32 *s = (const __le32 *)src;
__le32 *d = (__le32 *)dst;
u32 r0, r1, r2, r3, r4;
@ -418,12 +407,18 @@ static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
d[2] = cpu_to_le32(r2);
d[3] = cpu_to_le32(r3);
}
EXPORT_SYMBOL_GPL(__serpent_encrypt);
static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
const u32
*k = ((struct serpent_ctx *)ctx)->expkey;
__serpent_encrypt(ctx, dst, src);
}
void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
{
const u32 *k = ctx->expkey;
const __le32 *s = (const __le32 *)src;
__le32 *d = (__le32 *)dst;
u32 r0, r1, r2, r3, r4;
@ -472,6 +467,14 @@ static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
d[2] = cpu_to_le32(r1);
d[3] = cpu_to_le32(r4);
}
EXPORT_SYMBOL_GPL(__serpent_decrypt);
static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
__serpent_decrypt(ctx, dst, src);
}
static struct crypto_alg serpent_alg = {
.cra_name = "serpent",

25
include/crypto/serpent.h Normal file
View File

@ -0,0 +1,25 @@
/*
* Common values for serpent algorithms
*/
#ifndef _CRYPTO_SERPENT_H
#define _CRYPTO_SERPENT_H
#include <linux/types.h>
#include <linux/crypto.h>
#define SERPENT_MIN_KEY_SIZE 0
#define SERPENT_MAX_KEY_SIZE 32
#define SERPENT_EXPKEY_WORDS 132
#define SERPENT_BLOCK_SIZE 16
struct serpent_ctx {
u32 expkey[SERPENT_EXPKEY_WORDS];
};
int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen);
void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src);
void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src);
#endif