--- /dev/null
+/*
+ * 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;
+}
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