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crypto: sha512_generic - add a sha512 0-length pre-computed hash 

This patch adds the sha512 pre-computed 0-length hash so that device
drivers can use it when an hardware engine does not support computing a
hash from a 0 length input.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Antoine Tenart 2018-05-29 14:13:45 +02:00 committed by Herbert Xu
parent 25bc955103
commit 30c217ef64
2 changed files with 14 additions and 0 deletions
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12
crypto/sha512_generic.c
View File

@ -23,6 +23,18 @@
#include <asm/byteorder.h> #include <asm/byteorder.h>
#include <asm/unaligned.h> #include <asm/unaligned.h>
const u8 sha512_zero_message_hash[SHA512_DIGEST_SIZE] = {
0xcf, 0x83, 0xe1, 0x35, 0x7e, 0xef, 0xb8, 0xbd,
0xf1, 0x54, 0x28, 0x50, 0xd6, 0x6d, 0x80, 0x07,
0xd6, 0x20, 0xe4, 0x05, 0x0b, 0x57, 0x15, 0xdc,
0x83, 0xf4, 0xa9, 0x21, 0xd3, 0x6c, 0xe9, 0xce,
0x47, 0xd0, 0xd1, 0x3c, 0x5d, 0x85, 0xf2, 0xb0,
0xff, 0x83, 0x18, 0xd2, 0x87, 0x7e, 0xec, 0x2f,
0x63, 0xb9, 0x31, 0xbd, 0x47, 0x41, 0x7a, 0x81,
0xa5, 0x38, 0x32, 0x7a, 0xf9, 0x27, 0xda, 0x3e
};
EXPORT_SYMBOL_GPL(sha512_zero_message_hash);
static inline u64 Ch(u64 x, u64 y, u64 z) static inline u64 Ch(u64 x, u64 y, u64 z)
{ {
return z ^ (x & (y ^ z)); return z ^ (x & (y ^ z));

2
include/crypto/sha.h
View File

@ -71,6 +71,8 @@ extern const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE];
extern const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE]; extern const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE];
extern const u8 sha512_zero_message_hash[SHA512_DIGEST_SIZE];
struct sha1_state { struct sha1_state {
u32 state[SHA1_DIGEST_SIZE / 4]; u32 state[SHA1_DIGEST_SIZE / 4];
u64 count; u64 count;