/* 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_grpc/bn.h> #include <openssl_grpc/bytestring.h> #include <openssl_grpc/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; }