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Commit e2a7ce4e authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: sha1_generic - Add export/import support 



This patch adds export/import support to sha1_generic.  The exported
type is defined by struct sha1_state, which is basically the entire
descriptor state of sha1_generic.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 8267adab

crypto/sha1_generic.c

+25 −16
Original line number Diff line number Diff line
@@ -25,31 +25,21 @@ 
#include <crypto/sha.h>

#include <asm/byteorder.h>



struct sha1_ctx {

        u64 count;

        u32 state[5];

        u8 buffer[64];

};



static int sha1_init(struct shash_desc *desc)

{

	struct sha1_ctx *sctx = shash_desc_ctx(desc);

	struct sha1_state *sctx = shash_desc_ctx(desc);



	static const struct sha1_ctx initstate = {

	  0,

	  { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },

	  { 0, }

	*sctx = (struct sha1_state){

		.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },

	};



	*sctx = initstate;



	return 0;

}



static int sha1_update(struct shash_desc *desc, const u8 *data,

			unsigned int len)

{

	struct sha1_ctx *sctx = shash_desc_ctx(desc);

	struct sha1_state *sctx = shash_desc_ctx(desc);

	unsigned int partial, done;

	const u8 *src;
@@ -85,7 +75,7 @@ static int sha1_update(struct shash_desc *desc, const u8 *data, 
/* Add padding and return the message digest. */

static int sha1_final(struct shash_desc *desc, u8 *out)

{

	struct sha1_ctx *sctx = shash_desc_ctx(desc);

	struct sha1_state *sctx = shash_desc_ctx(desc);

	__be32 *dst = (__be32 *)out;

	u32 i, index, padlen;

	__be64 bits;
@@ -111,12 +101,31 @@ static int sha1_final(struct shash_desc *desc, u8 *out) 
	return 0;

}



static int 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 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		=	sha1_init,

	.update		=	sha1_update,

	.final		=	sha1_final,

	.descsize	=	sizeof(struct sha1_ctx),

	.export		=	sha1_export,

	.import		=	sha1_import,

	.descsize	=	sizeof(struct sha1_state),

	.statesize	=	sizeof(struct sha1_state),

	.base		=	{

		.cra_name	=	"sha1",

		.cra_driver_name=	"sha1-generic",

include/crypto/sha.h

+8 −0
Original line number Diff line number Diff line
@@ -5,6 +5,8 @@ 
#ifndef _CRYPTO_SHA_H

#define _CRYPTO_SHA_H



#include <linux/types.h>



#define SHA1_DIGEST_SIZE        20

#define SHA1_BLOCK_SIZE         64
@@ -62,4 +64,10 @@ 
#define SHA512_H6	0x1f83d9abfb41bd6bULL

#define SHA512_H7	0x5be0cd19137e2179ULL



struct sha1_state {

	u64 count;

	u32 state[SHA1_DIGEST_SIZE / 4];

	u8 buffer[SHA1_BLOCK_SIZE];

};



#endif