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crypto: hmac - add hmac IPAD/OPAD constant 

Many HMAC users directly use directly 0x36/0x5c values.
It's better with crypto to use a name instead of directly some crypto
constant.

This patch simply add HMAC_IPAD_VALUE/HMAC_OPAD_VALUE defines in a new
include file "crypto/hmac.h" and use them in crypto/hmac.c

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Corentin LABBE 2017-05-19 08:53:23 +02:00 committed by Herbert Xu
parent 9417cd1c51
commit 03d7db5654
2 changed files with 10 additions and 2 deletions
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5
crypto/hmac.c
View File

@ -16,6 +16,7 @@
*
*/
#include <crypto/hmac.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
@ -74,8 +75,8 @@ static int hmac_setkey(struct crypto_shash *parent,
memcpy(opad, ipad, bs);
for (i = 0; i < bs; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
ipad[i] ^= HMAC_IPAD_VALUE;
opad[i] ^= HMAC_OPAD_VALUE;
}
return crypto_shash_init(shash) ?:

7
include/crypto/hmac.h Normal file
View File

@ -0,0 +1,7 @@
#ifndef _CRYPTO_HMAC_H
#define _CRYPTO_HMAC_H
#define HMAC_IPAD_VALUE 0x36
#define HMAC_OPAD_VALUE 0x5c
#endif /* _CRYPTO_HMAC_H */