Commit 30c217ef authored by Antoine Tenart's avatar Antoine Tenart Committed by Herbert Xu
Browse files

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: default avatarAntoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 25bc9551

crypto/sha512_generic.c

+12 −0
Original line number Diff line number Diff line
@@ -23,6 +23,18 @@ 
#include <asm/byteorder.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)

{

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

include/crypto/sha.h

+2 −0
Original line number Diff line number Diff line
@@ -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 sha512_zero_message_hash[SHA512_DIGEST_SIZE];



struct sha1_state {

	u32 state[SHA1_DIGEST_SIZE / 4];

	u64 count;

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