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

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 <>
Signed-off-by: default avatarHerbert Xu <>
parent 51d77ddd
......@@ -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,
/* XXX: this stuff can be optimized */
static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
......@@ -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
static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
int blocks)
......@@ -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,
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
static inline u32 Ch(u32 x, u32 y, u32 z)
return z ^ (x & (y ^ z));
......@@ -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];
......@@ -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;
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