blob: a8333d419b770fee1bf0fa11ec10ab6d17796658 [file] [log] [blame]
/* Copyright (c) 2015, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/bn.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
int BN_parse_asn1_unsigned(CBS *cbs, BIGNUM *ret) {
CBS child;
int is_negative;
if (!CBS_get_asn1(cbs, &child, CBS_ASN1_INTEGER) ||
!CBS_is_valid_asn1_integer(&child, &is_negative)) {
OPENSSL_PUT_ERROR(BN, BN_R_BAD_ENCODING);
return 0;
}
if (is_negative) {
OPENSSL_PUT_ERROR(BN, BN_R_NEGATIVE_NUMBER);
return 0;
}
return BN_bin2bn(CBS_data(&child), CBS_len(&child), ret) != NULL;
}
int BN_marshal_asn1(CBB *cbb, const BIGNUM *bn) {
// Negative numbers are unsupported.
if (BN_is_negative(bn)) {
OPENSSL_PUT_ERROR(BN, BN_R_NEGATIVE_NUMBER);
return 0;
}
CBB child;
if (!CBB_add_asn1(cbb, &child, CBS_ASN1_INTEGER) ||
// The number must be padded with a leading zero if the high bit would
// otherwise be set or if |bn| is zero.
(BN_num_bits(bn) % 8 == 0 && !CBB_add_u8(&child, 0x00)) ||
!BN_bn2cbb_padded(&child, BN_num_bytes(bn), bn) ||
!CBB_flush(cbb)) {
OPENSSL_PUT_ERROR(BN, BN_R_ENCODE_ERROR);
return 0;
}
return 1;
}