#ifndef NO_HMAC
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/pkcs12.h>
int PKCS12_gen_mac (PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen)
{
const EVP_MD *md_type;
HMAC_CTX hmac;
unsigned char key[PKCS12_MAC_KEY_LENGTH], *salt;
int saltlen, iter;
salt = p12->mac->salt->data;
saltlen = p12->mac->salt->length;
if (!p12->mac->iter) iter = 1;
else iter = ASN1_INTEGER_get (p12->mac->iter);
if(!(md_type =
EVP_get_digestbyobj (p12->mac->dinfo->algor->algorithm))) {
PKCS12err(PKCS12_F_PKCS12_GEN_MAC,PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
return 0;
}
if(!PKCS12_key_gen (pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
PKCS12_MAC_KEY_LENGTH, key, md_type)) {
PKCS12err(PKCS12_F_PKCS12_GEN_MAC,PKCS12_R_KEY_GEN_ERROR);
return 0;
}
HMAC_Init (&hmac, key, PKCS12_MAC_KEY_LENGTH, md_type);
HMAC_Update (&hmac, p12->authsafes->d.data->data,
p12->authsafes->d.data->length);
HMAC_Final (&hmac, mac, maclen);
return 1;
}
int PKCS12_verify_mac (PKCS12 *p12, const char *pass, int passlen)
{
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
if(p12->mac == NULL) {
PKCS12err(PKCS12_F_VERIFY_MAC,PKCS12_R_MAC_ABSENT);
return 0;
}
if (!PKCS12_gen_mac (p12, pass, passlen, mac, &maclen)) {
PKCS12err(PKCS12_F_VERIFY_MAC,PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
if ((maclen != (unsigned int)p12->mac->dinfo->digest->length)
|| memcmp (mac, p12->mac->dinfo->digest->data, maclen)) return 0;
return 1;
}
int PKCS12_set_mac (PKCS12 *p12, const char *pass, int passlen,
unsigned char *salt, int saltlen, int iter, EVP_MD *md_type)
{
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
if (!md_type) md_type = EVP_sha1();
if (PKCS12_setup_mac (p12, iter, salt, saltlen, md_type) ==
PKCS12_ERROR) {
PKCS12err(PKCS12_F_PKCS12_SET_MAC,PKCS12_R_MAC_SETUP_ERROR);
return 0;
}
if (!PKCS12_gen_mac (p12, pass, passlen, mac, &maclen)) {
PKCS12err(PKCS12_F_PKCS12_SET_MAC,PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
if (!(M_ASN1_OCTET_STRING_set (p12->mac->dinfo->digest, mac, maclen))) {
PKCS12err(PKCS12_F_PKCS12_SET_MAC,PKCS12_R_MAC_STRING_SET_ERROR);
return 0;
}
return 1;
}
int PKCS12_setup_mac (PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
EVP_MD *md_type)
{
if (!(p12->mac = PKCS12_MAC_DATA_new())) return PKCS12_ERROR;
if (iter > 1) {
if(!(p12->mac->iter = M_ASN1_INTEGER_new())) {
PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
return 0;
}
ASN1_INTEGER_set(p12->mac->iter, iter);
}
if (!saltlen) saltlen = PKCS12_SALT_LEN;
p12->mac->salt->length = saltlen;
if (!(p12->mac->salt->data = OPENSSL_malloc (saltlen))) {
PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!salt) {
if (RAND_pseudo_bytes (p12->mac->salt->data, saltlen) < 0)
return 0;
}
else memcpy (p12->mac->salt->data, salt, saltlen);
p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type));
if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) {
PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
return 0;
}
p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL;
return 1;
}
#endif