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Add aes_gmac() as a wrapper for AES GMAC operations using GCM

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This is otherwise identical to aes_gcm_ae() but does not use the
plain/crypt pointers since no data is encrypted.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-09-09 13:37:50 +03:00
parent d140db6adf
commit 77b2c81275
3 changed files with 25 additions and 0 deletions
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8
src/crypto/aes-gcm.c
View file

@ -311,3 +311,11 @@ int aes_gcm_ad(const u8 *key, size_t key_len, const u8 *iv, size_t iv_len,
return 0;
}
int aes_gmac(const u8 *key, size_t key_len, const u8 *iv, size_t iv_len,
const u8 *aad, size_t aad_len, u8 *tag)
{
return aes_gcm_ae(key, key_len, iv, iv_len, NULL, 0, aad, aad_len, NULL,
tag);
}

3
src/crypto/aes_wrap.h
View file

@ -49,5 +49,8 @@ int __must_check aes_gcm_ad(const u8 *key, size_t key_len,
const u8 *crypt, size_t crypt_len,
const u8 *aad, size_t aad_len, const u8 *tag,
u8 *plain);
int __must_check aes_gmac(const u8 *key, size_t key_len,
const u8 *iv, size_t iv_len,
const u8 *aad, size_t aad_len, u8 *tag);
#endif /* AES_WRAP_H */

14
tests/test-aes.c
View file

@ -407,6 +407,20 @@ static int test_gcm(void)
ret++;
}
if (p_len == 0) {
if (aes_gmac(k, k_len, iv, iv_len, aad, aad_len, tag) <
0) {
printf("GMAC failed (test case %d)\n", i);
ret++;
continue;
}
if (os_memcmp(tag, t, sizeof(tag)) != 0) {
printf("GMAC tag mismatch (test case %d)\n", i);
ret++;
}
}
if (aes_gcm_ad(k, k_len, iv, iv_len, c, p_len, aad, aad_len,
t, tmp) < 0) {
printf("GCM-AD failed (test case %d)\n", i);