5c38c05b26
Change-Id: I68aa4a740ee1c7f2a308a6536f408929f15b694c Reviewed-on: https://boringssl-review.googlesource.com/15647 Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: Adam Langley <agl@google.com> CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/* Copyright (c) 2015, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/bn.h>
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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int BN_parse_asn1_unsigned(CBS *cbs, BIGNUM *ret) {
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CBS child;
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if (!CBS_get_asn1(cbs, &child, CBS_ASN1_INTEGER) ||
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CBS_len(&child) == 0) {
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OPENSSL_PUT_ERROR(BN, BN_R_BAD_ENCODING);
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return 0;
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}
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if (CBS_data(&child)[0] & 0x80) {
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OPENSSL_PUT_ERROR(BN, BN_R_NEGATIVE_NUMBER);
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return 0;
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}
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/* INTEGERs must be minimal. */
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if (CBS_data(&child)[0] == 0x00 &&
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CBS_len(&child) > 1 &&
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!(CBS_data(&child)[1] & 0x80)) {
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OPENSSL_PUT_ERROR(BN, BN_R_BAD_ENCODING);
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return 0;
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}
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return BN_bin2bn(CBS_data(&child), CBS_len(&child), ret) != NULL;
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}
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int BN_parse_asn1_unsigned_buggy(CBS *cbs, BIGNUM *ret) {
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CBS child;
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if (!CBS_get_asn1(cbs, &child, CBS_ASN1_INTEGER) ||
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CBS_len(&child) == 0) {
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OPENSSL_PUT_ERROR(BN, BN_R_BAD_ENCODING);
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return 0;
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}
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/* This function intentionally does not reject negative numbers or non-minimal
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* encodings. Estonian IDs issued between September 2014 to September 2015 are
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* broken. See https://crbug.com/532048 and https://crbug.com/534766.
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*
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* TODO(davidben): Remove this code and callers in March 2016. */
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return BN_bin2bn(CBS_data(&child), CBS_len(&child), ret) != NULL;
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}
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int BN_marshal_asn1(CBB *cbb, const BIGNUM *bn) {
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/* Negative numbers are unsupported. */
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if (BN_is_negative(bn)) {
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OPENSSL_PUT_ERROR(BN, BN_R_NEGATIVE_NUMBER);
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return 0;
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}
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CBB child;
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if (!CBB_add_asn1(cbb, &child, CBS_ASN1_INTEGER) ||
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/* The number must be padded with a leading zero if the high bit would
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* otherwise be set or if |bn| is zero. */
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(BN_num_bits(bn) % 8 == 0 && !CBB_add_u8(&child, 0x00)) ||
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!BN_bn2cbb_padded(&child, BN_num_bytes(bn), bn) ||
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!CBB_flush(cbb)) {
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OPENSSL_PUT_ERROR(BN, BN_R_ENCODE_ERROR);
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return 0;
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}
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return 1;
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}
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