proxmark3/client/emv/emv_pki_priv.c

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/*
* libopenemv - a library to work with EMV family of smart cards
* Copyright (C) 2015 Dmitry Eremin-Solenikov
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "emv_pki_priv.h"
#include "crypto.h"
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
struct emv_pk *emv_pki_make_ca(const struct crypto_pk *cp,
const unsigned char *rid, unsigned char index,
unsigned int expire, enum crypto_algo_hash hash_algo)
{
size_t modlen, explen;
unsigned char *mod, *exp;
if (!rid)
return NULL;
mod = crypto_pk_get_parameter(cp, 0, &modlen);
exp = crypto_pk_get_parameter(cp, 1, &explen);
if (!mod || !modlen || !exp || !explen) {
free(mod);
free(exp);
return NULL;
}
struct emv_pk *pk = emv_pk_new(modlen, explen);
memcpy(pk->rid, rid, 5);
pk->index = index;
pk->expire = expire;
pk->pk_algo = crypto_pk_get_algo(cp);
pk->hash_algo = hash_algo;
memcpy(pk->modulus, mod, modlen);
memcpy(pk->exp, exp, explen);
free(mod);
free(exp);
struct crypto_hash *ch = crypto_hash_open(pk->hash_algo);
if (!ch) {
emv_pk_free(pk);
return false;
}
crypto_hash_write(ch, pk->rid, sizeof(pk->rid));
crypto_hash_write(ch, &pk->index, 1);
crypto_hash_write(ch, pk->modulus, pk->mlen);
crypto_hash_write(ch, pk->exp, pk->elen);
unsigned char *h = crypto_hash_read(ch);
if (!h) {
crypto_hash_close(ch);
emv_pk_free(pk);
return NULL;
}
memcpy(pk->hash, h, crypto_hash_get_size(ch));
crypto_hash_close(ch);
return pk;
}
static struct tlvdb *emv_pki_sign_message(const struct crypto_pk *cp,
tlv_tag_t cert_tag, tlv_tag_t rem_tag,
const unsigned char *msg, size_t msg_len,
... /* A list of tlv pointers, end with NULL */
)
{
size_t tmp_len = (crypto_pk_get_nbits(cp) + 7) / 8;
unsigned char *tmp = malloc(tmp_len);
if (!tmp)
return NULL;
// XXX
struct crypto_hash *ch = crypto_hash_open(HASH_SHA_1);
if (!ch) {
free(tmp);
return NULL;
}
tmp[0] = 0x6a;
tmp[tmp_len - 1] = 0xbc;
const unsigned char *rem;
size_t rem_len;
size_t hash_len = crypto_hash_get_size(ch);
size_t part_len = tmp_len - 2 - hash_len;
if (part_len < msg_len) {
memcpy(tmp + 1, msg, part_len);
rem = msg + part_len;
rem_len = msg_len - part_len;
} else {
memcpy(tmp + 1, msg, msg_len);
memset(tmp + 1 + msg_len, 0xbb, part_len - msg_len);
rem = NULL;
rem_len = 0;
}
crypto_hash_write(ch, tmp + 1, part_len);
crypto_hash_write(ch, rem, rem_len);
va_list vl;
va_start(vl, msg_len);
while (true) {
const struct tlv *add_tlv = va_arg(vl, const struct tlv *);
if (!add_tlv)
break;
crypto_hash_write(ch, add_tlv->value, add_tlv->len);
}
va_end(vl);
unsigned char *h = crypto_hash_read(ch);
if (!h) {
crypto_hash_close(ch);
free(tmp);
return NULL;
}
memcpy(tmp + 1 + part_len, h, hash_len);
crypto_hash_close(ch);
size_t cert_len;
unsigned char *cert = crypto_pk_decrypt(cp, tmp, tmp_len, &cert_len);
free(tmp);
if (!cert)
return NULL;
struct tlvdb *db = tlvdb_fixed(cert_tag, cert_len, cert);
free(cert);
if (!db)
return NULL;
if (rem) {
struct tlvdb *rdb = tlvdb_fixed(rem_tag, rem_len, rem);
if (!rdb) {
tlvdb_free(db);
return NULL;
}
tlvdb_add(db, rdb);
}
return db;
}
static struct tlvdb *emv_pki_sign_key(const struct crypto_pk *cp,
struct emv_pk *ipk,
unsigned char msgtype,
size_t pan_len,
tlv_tag_t cert_tag,
tlv_tag_t exp_tag,
tlv_tag_t rem_tag,
const struct tlv *add_tlv
)
{
unsigned pos = 0;
unsigned char *msg = malloc(1 + pan_len + 2 + 3 + 1 + 1 + 1 + 1 + ipk->mlen);
if (!msg)
return NULL;
msg[pos++] = msgtype;
memcpy(msg + pos, ipk->pan, pan_len); pos += pan_len;
msg[pos++] = (ipk->expire >> 8) & 0xff;
msg[pos++] = (ipk->expire >> 16) & 0xff;
memcpy(msg + pos, ipk->serial, 3); pos += 3;
msg[pos++] = ipk->hash_algo;
msg[pos++] = ipk->pk_algo;
msg[pos++] = ipk->mlen;
msg[pos++] = ipk->elen;
memcpy(msg + pos, ipk->modulus, ipk->mlen);
pos += ipk->mlen;
struct tlvdb *exp_db = tlvdb_fixed(exp_tag, ipk->elen, ipk->exp);
if (!exp_db) {
free(msg);
return NULL;
}
struct tlvdb *db = emv_pki_sign_message(cp,
cert_tag, rem_tag,
msg, pos,
tlvdb_get(exp_db, exp_tag, NULL),
add_tlv,
NULL);
free(msg);
if (!db)
return NULL;
tlvdb_add(db, exp_db);
return db;
}
struct tlvdb *emv_pki_sign_issuer_cert(const struct crypto_pk *cp, struct emv_pk *issuer_pk)
{
return emv_pki_sign_key(cp, issuer_pk, 2, 4, 0x90, 0x9f32, 0x92, NULL);
}
struct tlvdb *emv_pki_sign_icc_cert(const struct crypto_pk *cp, struct emv_pk *icc_pk, const struct tlv *sda_tlv)
{
return emv_pki_sign_key(cp, icc_pk, 4, 10, 0x9f46, 0x9f47, 0x9f48, sda_tlv);
}
struct tlvdb *emv_pki_sign_icc_pe_cert(const struct crypto_pk *cp, struct emv_pk *icc_pe_pk)
{
return emv_pki_sign_key(cp, icc_pe_pk, 4, 10, 0x9f2d, 0x9f2e, 0x9f2f, NULL);
}
struct tlvdb *emv_pki_sign_dac(const struct crypto_pk *cp, const struct tlv *dac_tlv, const struct tlv *sda_tlv)
{
unsigned pos = 0;
unsigned char *msg = malloc(1+1+dac_tlv->len);
if (!msg)
return NULL;
msg[pos++] = 3;
msg[pos++] = HASH_SHA_1;
memcpy(msg+pos, dac_tlv->value, dac_tlv->len);
pos += dac_tlv->len;
struct tlvdb *db = emv_pki_sign_message(cp,
0x93, 0,
msg, pos,
sda_tlv,
NULL);
free(msg);
return db;
}
struct tlvdb *emv_pki_sign_idn(const struct crypto_pk *cp, const struct tlv *idn_tlv, const struct tlv *dyn_tlv)
{
unsigned pos = 0;
unsigned char *msg = malloc(1+1+1+1+idn_tlv->len);
if (!msg)
return NULL;
msg[pos++] = 5;
msg[pos++] = HASH_SHA_1;
msg[pos++] = idn_tlv->len + 1;
msg[pos++] = idn_tlv->len;
memcpy(msg+pos, idn_tlv->value, idn_tlv->len);
pos += idn_tlv->len;
struct tlvdb *db = emv_pki_sign_message(cp,
0x9f4b, 0,
msg, pos,
dyn_tlv,
NULL);
free(msg);
return db;
}