PKCS#12 mac key length should equal digest length.

crypto/pkcs12/p12_mutl.c

@@ -69,7 +69,7 @@ int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
 {
 	const EVP_MD *md_type;
 	HMAC_CTX hmac;
-	unsigned char key[PKCS12_MAC_KEY_LENGTH], *salt;
+	unsigned char key[EVP_MAX_MD_SIZE], *salt;
 	int saltlen, iter;
 
 	if (!PKCS7_type_is_data(p12->authsafes))
@@ -88,12 +88,12 @@ int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
 		return 0;
 	}
 	if(!PKCS12_key_gen (pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
-				 PKCS12_MAC_KEY_LENGTH, key, md_type)) {
+				 EVP_MD_size(md_type), key, md_type)) {
 		PKCS12err(PKCS12_F_PKCS12_GEN_MAC,PKCS12_R_KEY_GEN_ERROR);
 		return 0;
 	}
 	HMAC_CTX_init(&hmac);
-	HMAC_Init_ex(&hmac, key, PKCS12_MAC_KEY_LENGTH, md_type, NULL);
+	HMAC_Init_ex(&hmac, key, EVP_MD_size(md_type), md_type, NULL);
     	HMAC_Update(&hmac, p12->authsafes->d.data->data,
 					 p12->authsafes->d.data->length);
     	HMAC_Final(&hmac, mac, maclen);