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Commit 0c4c78de authored by LABBE Corentin's avatar LABBE Corentin Committed by Herbert Xu
Browse files

crypto: hash - add zero length message hash for shax and md5 



Some crypto drivers cannot process empty data message and return a
precalculated hash for md5/sha1/sha224/sha256.

This patch add thoses precalculated hash in include/crypto.

Signed-off-by: default avatarLABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 51d77ddd

crypto/md5.c

+6 −0
Original line number Diff line number Diff line
@@ -24,6 +24,12 @@ 
#include <linux/cryptohash.h>

#include <asm/byteorder.h>



const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = {

	0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,

	0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e,

};

EXPORT_SYMBOL_GPL(md5_zero_message_hash);



/* XXX: this stuff can be optimized */

static inline void le32_to_cpu_array(u32 *buf, unsigned int words)

{

crypto/sha1_generic.c

+7 −0
Original line number Diff line number Diff line
@@ -26,6 +26,13 @@ 
#include <crypto/sha1_base.h>

#include <asm/byteorder.h>



const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {

	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,

	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,

	0xaf, 0xd8, 0x07, 0x09

};

EXPORT_SYMBOL_GPL(sha1_zero_message_hash);



static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,

				  int blocks)

{

crypto/sha256_generic.c

+16 −0
Original line number Diff line number Diff line
@@ -27,6 +27,22 @@ 
#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 inline u32 Ch(u32 x, u32 y, u32 z)

{

	return z ^ (x & (y ^ z));

include/crypto/md5.h

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ 
#define MD5_H2	0x98badcfeUL

#define MD5_H3	0x10325476UL



extern const u8 md5_zero_message_hash[MD5_DIGEST_SIZE];



struct md5_state {

	u32 hash[MD5_HASH_WORDS];

	u32 block[MD5_BLOCK_WORDS];

include/crypto/sha.h

+6 −0
Original line number Diff line number Diff line
@@ -64,6 +64,12 @@ 
#define SHA512_H6	0x1f83d9abfb41bd6bULL

#define SHA512_H7	0x5be0cd19137e2179ULL



extern const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE];



extern const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE];



extern const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE];



struct sha1_state {

	u32 state[SHA1_DIGEST_SIZE / 4];

	u64 count;