413 lines
10 KiB
C
413 lines
10 KiB
C
// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#include <openssl/asn1.h>
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#include <limits.h>
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#include <string.h>
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/type_check.h>
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#include "../internal.h"
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ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x) {
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return ASN1_STRING_dup(x);
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}
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int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y) {
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// Compare signs.
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int neg = x->type & V_ASN1_NEG;
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if (neg != (y->type & V_ASN1_NEG)) {
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return neg ? -1 : 1;
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}
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int ret = ASN1_STRING_cmp(x, y);
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if (neg) {
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// This could be |-ret|, but |ASN1_STRING_cmp| is not forbidden from
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// returning |INT_MIN|.
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if (ret < 0) {
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return 1;
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} else if (ret > 0) {
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return -1;
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} else {
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return 0;
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}
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}
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return ret;
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}
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// negate_twos_complement negates |len| bytes from |buf| in-place, interpreted
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// as a signed, big-endian two's complement value.
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static void negate_twos_complement(uint8_t *buf, size_t len) {
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uint8_t borrow = 0;
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for (size_t i = len - 1; i < len; i--) {
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uint8_t t = buf[i];
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buf[i] = 0u - borrow - t;
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borrow |= t != 0;
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}
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}
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static int is_all_zeros(const uint8_t *in, size_t len) {
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for (size_t i = 0; i < len; i++) {
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if (in[i] != 0) {
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return 0;
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}
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}
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return 1;
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}
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int i2c_ASN1_INTEGER(const ASN1_INTEGER *in, unsigned char **outp) {
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if (in == NULL) {
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return 0;
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}
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// |ASN1_INTEGER|s should be represented minimally, but it is possible to
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// construct invalid ones. Skip leading zeros so this does not produce an
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// invalid encoding or break invariants.
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CBS cbs;
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CBS_init(&cbs, in->data, in->length);
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while (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0) {
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CBS_skip(&cbs, 1);
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}
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int is_negative = (in->type & V_ASN1_NEG) != 0;
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size_t pad;
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CBS copy = cbs;
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uint8_t msb;
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if (!CBS_get_u8(©, &msb)) {
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// Zero is represented as a single byte.
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is_negative = 0;
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pad = 1;
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} else if (is_negative) {
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// 0x80...01 through 0xff...ff have a two's complement of 0x7f...ff
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// through 0x00...01 and need an extra byte to be negative.
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// 0x01...00 through 0x80...00 have a two's complement of 0xfe...ff
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// through 0x80...00 and can be negated as-is.
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pad = msb > 0x80 ||
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(msb == 0x80 && !is_all_zeros(CBS_data(©), CBS_len(©)));
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} else {
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// If the high bit is set, the signed representation needs an extra
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// byte to be positive.
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pad = (msb & 0x80) != 0;
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}
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if (CBS_len(&cbs) > INT_MAX - pad) {
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OPENSSL_PUT_ERROR(ASN1, ERR_R_OVERFLOW);
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return 0;
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}
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int len = (int)(pad + CBS_len(&cbs));
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assert(len > 0);
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if (outp == NULL) {
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return len;
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}
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if (pad) {
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(*outp)[0] = 0;
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}
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OPENSSL_memcpy(*outp + pad, CBS_data(&cbs), CBS_len(&cbs));
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if (is_negative) {
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negate_twos_complement(*outp, len);
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assert((*outp)[0] >= 0x80);
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} else {
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assert((*outp)[0] < 0x80);
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}
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*outp += len;
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return len;
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}
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ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **out, const unsigned char **inp,
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long len) {
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// This function can handle lengths up to INT_MAX - 1, but the rest of the
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// legacy ASN.1 code mixes integer types, so avoid exposing it to
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// ASN1_INTEGERS with larger lengths.
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if (len < 0 || len > INT_MAX / 2) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
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return NULL;
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}
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CBS cbs;
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CBS_init(&cbs, *inp, (size_t)len);
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int is_negative;
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if (!CBS_is_valid_asn1_integer(&cbs, &is_negative)) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
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return NULL;
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}
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ASN1_INTEGER *ret = NULL;
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if (out == NULL || *out == NULL) {
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ret = ASN1_INTEGER_new();
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if (ret == NULL) {
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return NULL;
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}
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} else {
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ret = *out;
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}
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// Convert to |ASN1_INTEGER|'s sign-and-magnitude representation. First,
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// determine the size needed for a minimal result.
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if (is_negative) {
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// 0xff00...01 through 0xff7f..ff have a two's complement of 0x00ff...ff
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// through 0x000100...001 and need one leading zero removed. 0x8000...00
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// through 0xff00...00 have a two's complement of 0x8000...00 through
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// 0x0100...00 and will be minimally-encoded as-is.
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if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0xff &&
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!is_all_zeros(CBS_data(&cbs) + 1, CBS_len(&cbs) - 1)) {
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CBS_skip(&cbs, 1);
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}
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} else {
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// Remove the leading zero byte, if any.
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if (CBS_len(&cbs) > 0 && CBS_data(&cbs)[0] == 0x00) {
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CBS_skip(&cbs, 1);
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}
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}
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if (!ASN1_STRING_set(ret, CBS_data(&cbs), CBS_len(&cbs))) {
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goto err;
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}
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if (is_negative) {
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ret->type = V_ASN1_NEG_INTEGER;
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negate_twos_complement(ret->data, ret->length);
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} else {
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ret->type = V_ASN1_INTEGER;
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}
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// The value should be minimally-encoded.
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assert(ret->length == 0 || ret->data[0] != 0);
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// Zero is not negative.
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assert(!is_negative || ret->length > 0);
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*inp += len;
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if (out != NULL) {
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*out = ret;
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}
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return ret;
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err:
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if (ret != NULL && (out == NULL || *out != ret)) {
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ASN1_INTEGER_free(ret);
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}
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return NULL;
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}
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int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t v) {
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if (v >= 0) {
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return ASN1_INTEGER_set_uint64(a, (uint64_t)v);
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}
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if (!ASN1_INTEGER_set_uint64(a, 0 - (uint64_t)v)) {
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return 0;
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}
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a->type = V_ASN1_NEG_INTEGER;
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return 1;
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}
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int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t v) {
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if (v >= 0) {
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return ASN1_ENUMERATED_set_uint64(a, (uint64_t)v);
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}
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if (!ASN1_ENUMERATED_set_uint64(a, 0 - (uint64_t)v)) {
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return 0;
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}
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a->type = V_ASN1_NEG_ENUMERATED;
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return 1;
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}
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int ASN1_INTEGER_set(ASN1_INTEGER *a, long v) {
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OPENSSL_STATIC_ASSERT(sizeof(long) <= sizeof(int64_t), long_fits_in_int64_t);
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return ASN1_INTEGER_set_int64(a, v);
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}
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int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) {
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OPENSSL_STATIC_ASSERT(sizeof(long) <= sizeof(int64_t), long_fits_in_int64_t);
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return ASN1_ENUMERATED_set_int64(a, v);
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}
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static int asn1_string_set_uint64(ASN1_STRING *out, uint64_t v, int type) {
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uint8_t buf[sizeof(uint64_t)];
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CRYPTO_store_u64_be(buf, v);
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size_t leading_zeros;
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for (leading_zeros = 0; leading_zeros < sizeof(buf); leading_zeros++) {
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if (buf[leading_zeros] != 0) {
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break;
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}
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}
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if (!ASN1_STRING_set(out, buf + leading_zeros, sizeof(buf) - leading_zeros)) {
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return 0;
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}
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out->type = type;
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return 1;
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}
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int ASN1_INTEGER_set_uint64(ASN1_INTEGER *out, uint64_t v) {
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return asn1_string_set_uint64(out, v, V_ASN1_INTEGER);
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}
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int ASN1_ENUMERATED_set_uint64(ASN1_ENUMERATED *out, uint64_t v) {
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return asn1_string_set_uint64(out, v, V_ASN1_ENUMERATED);
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}
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static int asn1_string_get_abs_uint64(uint64_t *out, const ASN1_STRING *a,
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int type) {
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if ((a->type & ~V_ASN1_NEG) != type) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
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return 0;
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}
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uint8_t buf[sizeof(uint64_t)] = {0};
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if (a->length > (int)sizeof(buf)) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
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return 0;
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}
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OPENSSL_memcpy(buf + sizeof(buf) - a->length, a->data, a->length);
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*out = CRYPTO_load_u64_be(buf);
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return 1;
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}
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static int asn1_string_get_uint64(uint64_t *out, const ASN1_STRING *a,
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int type) {
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if (!asn1_string_get_abs_uint64(out, a, type)) {
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return 0;
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}
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if (a->type & V_ASN1_NEG) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
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return 0;
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}
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return 1;
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}
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int ASN1_INTEGER_get_uint64(uint64_t *out, const ASN1_INTEGER *a) {
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return asn1_string_get_uint64(out, a, V_ASN1_INTEGER);
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}
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int ASN1_ENUMERATED_get_uint64(uint64_t *out, const ASN1_ENUMERATED *a) {
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return asn1_string_get_uint64(out, a, V_ASN1_ENUMERATED);
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}
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static int asn1_string_get_int64(int64_t *out, const ASN1_STRING *a, int type) {
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uint64_t v;
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if (!asn1_string_get_abs_uint64(&v, a, type)) {
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return 0;
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}
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int64_t i64;
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int fits_in_i64;
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// Check |v != 0| to handle manually-constructed negative zeros.
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if ((a->type & V_ASN1_NEG) && v != 0) {
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i64 = (int64_t)(0u - v);
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fits_in_i64 = i64 < 0;
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} else {
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i64 = (int64_t)v;
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fits_in_i64 = i64 >= 0;
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}
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if (!fits_in_i64) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_INTEGER);
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return 0;
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}
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*out = i64;
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return 1;
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}
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int ASN1_INTEGER_get_int64(int64_t *out, const ASN1_INTEGER *a) {
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return asn1_string_get_int64(out, a, V_ASN1_INTEGER);
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}
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int ASN1_ENUMERATED_get_int64(int64_t *out, const ASN1_ENUMERATED *a) {
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return asn1_string_get_int64(out, a, V_ASN1_ENUMERATED);
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}
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static long asn1_string_get_long(const ASN1_STRING *a, int type) {
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if (a == NULL) {
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return 0;
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}
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int64_t v;
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if (!asn1_string_get_int64(&v, a, type) || //
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v < LONG_MIN || v > LONG_MAX) {
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// This function's return value does not distinguish overflow from -1.
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ERR_clear_error();
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return -1;
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}
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return (long)v;
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}
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long ASN1_INTEGER_get(const ASN1_INTEGER *a) {
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return asn1_string_get_long(a, V_ASN1_INTEGER);
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}
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long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a) {
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return asn1_string_get_long(a, V_ASN1_ENUMERATED);
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}
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static ASN1_STRING *bn_to_asn1_string(const BIGNUM *bn, ASN1_STRING *ai,
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int type) {
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ASN1_INTEGER *ret;
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if (ai == NULL) {
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ret = ASN1_STRING_type_new(type);
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} else {
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ret = ai;
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}
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if (ret == NULL) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
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goto err;
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}
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if (BN_is_negative(bn) && !BN_is_zero(bn)) {
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ret->type = type | V_ASN1_NEG;
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} else {
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ret->type = type;
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}
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int len = BN_num_bytes(bn);
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if (!ASN1_STRING_set(ret, NULL, len) ||
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!BN_bn2bin_padded(ret->data, len, bn)) {
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goto err;
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}
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return ret;
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err:
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if (ret != ai) {
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ASN1_STRING_free(ret);
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}
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return NULL;
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}
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ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai) {
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return bn_to_asn1_string(bn, ai, V_ASN1_INTEGER);
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}
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ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai) {
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return bn_to_asn1_string(bn, ai, V_ASN1_ENUMERATED);
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}
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static BIGNUM *asn1_string_to_bn(const ASN1_STRING *ai, BIGNUM *bn, int type) {
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if ((ai->type & ~V_ASN1_NEG) != type) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_INTEGER_TYPE);
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return NULL;
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}
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BIGNUM *ret;
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if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) {
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OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
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} else if (ai->type & V_ASN1_NEG) {
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BN_set_negative(ret, 1);
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}
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return ret;
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}
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BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn) {
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return asn1_string_to_bn(ai, bn, V_ASN1_INTEGER);
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}
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BIGNUM *ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn) {
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return asn1_string_to_bn(ai, bn, V_ASN1_ENUMERATED);
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}
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