mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2018 Merlok
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// asn.1 utils
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//-----------------------------------------------------------------------------
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#include "asn1utils.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include <mbedtls/asn1.h>
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#include "emv/tlv.h"
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#include "emv/dump.h"
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#include "asn1dump.h"
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#include "util.h"
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int ecdsa_asn1_get_signature(uint8_t *signature, size_t signaturelen, uint8_t *rval, uint8_t *sval) {
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if (!signature || !signaturelen || !rval || !sval)
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return 1;
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int res = 0;
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unsigned char *p = signature;
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const unsigned char *end = p + signaturelen;
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size_t len;
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mbedtls_mpi xmpi;
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if ((res = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) == 0) {
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mbedtls_mpi_init(&xmpi);
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res = mbedtls_asn1_get_mpi(&p, end, &xmpi);
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if (res) {
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mbedtls_mpi_free(&xmpi);
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goto exit;
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}
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res = mbedtls_mpi_write_binary(&xmpi, rval, 32);
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mbedtls_mpi_free(&xmpi);
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if (res)
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goto exit;
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mbedtls_mpi_init(&xmpi);
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res = mbedtls_asn1_get_mpi(&p, end, &xmpi);
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if (res) {
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mbedtls_mpi_free(&xmpi);
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goto exit;
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}
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res = mbedtls_mpi_write_binary(&xmpi, sval, 32);
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mbedtls_mpi_free(&xmpi);
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if (res)
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goto exit;
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// check size
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if (end != p)
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return 2;
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}
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exit:
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return res;
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}
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static bool print_cb(void *data, const struct tlv *tlv, int level, bool is_leaf) {
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bool candump = true;
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asn1_tag_dump(tlv, stdout, level, &candump);
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if (is_leaf && candump) {
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dump_buffer(tlv->value, tlv->len, stdout, level);
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}
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return true;
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}
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int asn1_print(uint8_t *asn1buf, size_t asn1buflen, const char *indent) {
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struct tlvdb *t = tlvdb_parse_multi(asn1buf, asn1buflen);
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if (t) {
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tlvdb_visit(t, print_cb, NULL, 0);
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tlvdb_free(t);
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} else {
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PrintAndLogEx(ERR, "Can't parse data as TLV tree.");
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return 1;
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}
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return 0;
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}
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