26a7d938c9
Since return is inconsistent, I removed unnecessary parentheses and unified them. Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4541)
630 lines
17 KiB
C
630 lines
17 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include "internal/numbers.h"
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#include <limits.h>
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#include <openssl/asn1.h>
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#include <openssl/bn.h>
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#include "asn1_locl.h"
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ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x)
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{
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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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{
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int neg, ret;
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/* Compare signs */
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neg = x->type & V_ASN1_NEG;
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if (neg != (y->type & V_ASN1_NEG)) {
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if (neg)
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return -1;
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else
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return 1;
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}
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ret = ASN1_STRING_cmp(x, y);
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if (neg)
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return -ret;
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else
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return ret;
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}
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/*-
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* This converts a big endian buffer and sign into its content encoding.
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* This is used for INTEGER and ENUMERATED types.
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* The internal representation is an ASN1_STRING whose data is a big endian
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* representation of the value, ignoring the sign. The sign is determined by
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* the type: if type & V_ASN1_NEG is true it is negative, otherwise positive.
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*
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* Positive integers are no problem: they are almost the same as the DER
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* encoding, except if the first byte is >= 0x80 we need to add a zero pad.
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*
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* Negative integers are a bit trickier...
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* The DER representation of negative integers is in 2s complement form.
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* The internal form is converted by complementing each octet and finally
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* adding one to the result. This can be done less messily with a little trick.
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* If the internal form has trailing zeroes then they will become FF by the
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* complement and 0 by the add one (due to carry) so just copy as many trailing
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* zeros to the destination as there are in the source. The carry will add one
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* to the last none zero octet: so complement this octet and add one and finally
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* complement any left over until you get to the start of the string.
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*
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* Padding is a little trickier too. If the first bytes is > 0x80 then we pad
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* with 0xff. However if the first byte is 0x80 and one of the following bytes
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* is non-zero we pad with 0xff. The reason for this distinction is that 0x80
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* followed by optional zeros isn't padded.
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*/
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/*
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* If |pad| is zero, the operation is effectively reduced to memcpy,
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* and if |pad| is 0xff, then it performs two's complement, ~dst + 1.
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* Note that in latter case sequence of zeros yields itself, and so
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* does 0x80 followed by any number of zeros. These properties are
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* used elsewhere below...
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*/
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static void twos_complement(unsigned char *dst, const unsigned char *src,
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size_t len, unsigned char pad)
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{
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unsigned int carry = pad & 1;
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/* Begin at the end of the encoding */
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dst += len;
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src += len;
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/* two's complement value: ~value + 1 */
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while (len-- != 0) {
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*(--dst) = (unsigned char)(carry += *(--src) ^ pad);
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carry >>= 8;
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}
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}
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static size_t i2c_ibuf(const unsigned char *b, size_t blen, int neg,
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unsigned char **pp)
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{
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unsigned int pad = 0;
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size_t ret, i;
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unsigned char *p, pb = 0;
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if (b != NULL && blen) {
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ret = blen;
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i = b[0];
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if (!neg && (i > 127)) {
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pad = 1;
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pb = 0;
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} else if (neg) {
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pb = 0xFF;
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if (i > 128) {
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pad = 1;
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} else if (i == 128) {
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/*
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* Special case [of minimal negative for given length]:
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* if any other bytes non zero we pad, otherwise we don't.
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*/
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for (pad = 0, i = 1; i < blen; i++)
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pad |= b[i];
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pb = pad != 0 ? 0xffU : 0;
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pad = pb & 1;
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}
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}
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ret += pad;
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} else {
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ret = 1;
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blen = 0; /* reduce '(b == NULL || blen == 0)' to '(blen == 0)' */
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}
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if (pp == NULL || (p = *pp) == NULL)
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return ret;
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/*
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* This magically handles all corner cases, such as '(b == NULL ||
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* blen == 0)', non-negative value, "negative" zero, 0x80 followed
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* by any number of zeros...
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*/
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*p = pb;
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p += pad; /* yes, p[0] can be written twice, but it's little
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* price to pay for eliminated branches */
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twos_complement(p, b, blen, pb);
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*pp += ret;
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return ret;
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}
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/*
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* convert content octets into a big endian buffer. Returns the length
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* of buffer or 0 on error: for malformed INTEGER. If output buffer is
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* NULL just return length.
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*/
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static size_t c2i_ibuf(unsigned char *b, int *pneg,
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const unsigned char *p, size_t plen)
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{
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int neg, pad;
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/* Zero content length is illegal */
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if (plen == 0) {
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ASN1err(ASN1_F_C2I_IBUF, ASN1_R_ILLEGAL_ZERO_CONTENT);
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return 0;
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}
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neg = p[0] & 0x80;
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if (pneg)
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*pneg = neg;
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/* Handle common case where length is 1 octet separately */
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if (plen == 1) {
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if (b != NULL) {
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if (neg)
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b[0] = (p[0] ^ 0xFF) + 1;
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else
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b[0] = p[0];
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}
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return 1;
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}
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pad = 0;
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if (p[0] == 0) {
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pad = 1;
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} else if (p[0] == 0xFF) {
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size_t i;
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/*
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* Special case [of "one less minimal negative" for given length]:
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* if any other bytes non zero it was padded, otherwise not.
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*/
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for (pad = 0, i = 1; i < plen; i++)
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pad |= p[i];
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pad = pad != 0 ? 1 : 0;
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}
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/* reject illegal padding: first two octets MSB can't match */
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if (pad && (neg == (p[1] & 0x80))) {
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ASN1err(ASN1_F_C2I_IBUF, ASN1_R_ILLEGAL_PADDING);
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return 0;
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}
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/* skip over pad */
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p += pad;
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plen -= pad;
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if (b != NULL)
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twos_complement(b, p, plen, neg ? 0xffU : 0);
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return plen;
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}
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int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
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{
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return i2c_ibuf(a->data, a->length, a->type & V_ASN1_NEG, pp);
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}
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/* Convert big endian buffer into uint64_t, return 0 on error */
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static int asn1_get_uint64(uint64_t *pr, const unsigned char *b, size_t blen)
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{
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size_t i;
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uint64_t r;
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if (blen > sizeof(*pr)) {
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ASN1err(ASN1_F_ASN1_GET_UINT64, ASN1_R_TOO_LARGE);
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return 0;
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}
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if (b == NULL)
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return 0;
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for (r = 0, i = 0; i < blen; i++) {
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r <<= 8;
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r |= b[i];
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}
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*pr = r;
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return 1;
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}
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/*
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* Write uint64_t to big endian buffer and return offset to first
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* written octet. In other words it returns offset in range from 0
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* to 7, with 0 denoting 8 written octets and 7 - one.
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*/
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static size_t asn1_put_uint64(unsigned char b[sizeof(uint64_t)], uint64_t r)
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{
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size_t off = sizeof(uint64_t);
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do {
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b[--off] = (unsigned char)r;
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} while (r >>= 8);
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return off;
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}
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/*
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* Absolute value of INT64_MIN: we can't just use -INT64_MIN as gcc produces
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* overflow warnings.
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*/
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#define ABS_INT64_MIN ((uint64_t)INT64_MAX + (-(INT64_MIN + INT64_MAX)))
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/* signed version of asn1_get_uint64 */
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static int asn1_get_int64(int64_t *pr, const unsigned char *b, size_t blen,
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int neg)
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{
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uint64_t r;
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if (asn1_get_uint64(&r, b, blen) == 0)
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return 0;
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if (neg) {
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if (r <= INT64_MAX) {
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/* Most significant bit is guaranteed to be clear, negation
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* is guaranteed to be meaningful in platform-neutral sense. */
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*pr = -(int64_t)r;
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} else if (r == ABS_INT64_MIN) {
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/* This never happens if INT64_MAX == ABS_INT64_MIN, e.g.
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* on ones'-complement system. */
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*pr = (int64_t)(0 - r);
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} else {
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ASN1err(ASN1_F_ASN1_GET_INT64, ASN1_R_TOO_SMALL);
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return 0;
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}
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} else {
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if (r <= INT64_MAX) {
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*pr = (int64_t)r;
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} else {
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ASN1err(ASN1_F_ASN1_GET_INT64, ASN1_R_TOO_LARGE);
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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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/* Convert ASN1 INTEGER content octets to ASN1_INTEGER structure */
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ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp,
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long len)
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{
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ASN1_INTEGER *ret = NULL;
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size_t r;
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int neg;
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r = c2i_ibuf(NULL, NULL, *pp, len);
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if (r == 0)
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return NULL;
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if ((a == NULL) || ((*a) == 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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ret->type = V_ASN1_INTEGER;
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} else
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ret = *a;
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if (ASN1_STRING_set(ret, NULL, r) == 0)
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goto err;
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c2i_ibuf(ret->data, &neg, *pp, len);
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if (neg)
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ret->type |= V_ASN1_NEG;
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*pp += len;
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if (a != NULL)
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(*a) = ret;
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return ret;
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err:
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ASN1err(ASN1_F_C2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
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if ((a == NULL) || (*a != ret))
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ASN1_INTEGER_free(ret);
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return NULL;
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}
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static int asn1_string_get_int64(int64_t *pr, const ASN1_STRING *a, int itype)
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{
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if (a == NULL) {
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ASN1err(ASN1_F_ASN1_STRING_GET_INT64, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if ((a->type & ~V_ASN1_NEG) != itype) {
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ASN1err(ASN1_F_ASN1_STRING_GET_INT64, ASN1_R_WRONG_INTEGER_TYPE);
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return 0;
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}
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return asn1_get_int64(pr, a->data, a->length, a->type & V_ASN1_NEG);
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}
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static int asn1_string_set_int64(ASN1_STRING *a, int64_t r, int itype)
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{
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unsigned char tbuf[sizeof(r)];
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size_t off;
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a->type = itype;
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if (r < 0) {
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/* Most obvious '-r' triggers undefined behaviour for most
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* common INT64_MIN. Even though below '0 - (uint64_t)r' can
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* appear two's-complement centric, it does produce correct/
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* expected result even on one's-complement. This is because
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* cast to unsigned has to change bit pattern... */
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off = asn1_put_uint64(tbuf, 0 - (uint64_t)r);
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a->type |= V_ASN1_NEG;
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} else {
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off = asn1_put_uint64(tbuf, r);
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a->type &= ~V_ASN1_NEG;
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}
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return ASN1_STRING_set(a, tbuf + off, sizeof(tbuf) - off);
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}
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static int asn1_string_get_uint64(uint64_t *pr, const ASN1_STRING *a,
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int itype)
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{
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if (a == NULL) {
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ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if ((a->type & ~V_ASN1_NEG) != itype) {
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ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ASN1_R_WRONG_INTEGER_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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ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
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return 0;
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}
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return asn1_get_uint64(pr, a->data, a->length);
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}
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static int asn1_string_set_uint64(ASN1_STRING *a, uint64_t r, int itype)
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{
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unsigned char tbuf[sizeof(r)];
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size_t off;
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a->type = itype;
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off = asn1_put_uint64(tbuf, r);
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return ASN1_STRING_set(a, tbuf + off, sizeof(tbuf) - off);
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}
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/*
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* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of ASN1
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* integers: some broken software can encode a positive INTEGER with its MSB
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* set as negative (it doesn't add a padding zero).
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*/
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ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp,
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long length)
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{
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ASN1_INTEGER *ret = NULL;
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const unsigned char *p;
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unsigned char *s;
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long len;
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int inf, tag, xclass;
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int i;
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if ((a == NULL) || ((*a) == NULL)) {
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if ((ret = ASN1_INTEGER_new()) == NULL)
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return NULL;
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ret->type = V_ASN1_INTEGER;
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} else
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ret = (*a);
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p = *pp;
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inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
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if (inf & 0x80) {
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i = ASN1_R_BAD_OBJECT_HEADER;
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goto err;
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}
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if (tag != V_ASN1_INTEGER) {
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i = ASN1_R_EXPECTING_AN_INTEGER;
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goto err;
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}
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/*
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* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it signifies
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* a missing NULL parameter.
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*/
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s = OPENSSL_malloc((int)len + 1);
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if (s == NULL) {
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i = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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ret->type = V_ASN1_INTEGER;
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if (len) {
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if ((*p == 0) && (len != 1)) {
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p++;
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len--;
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}
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memcpy(s, p, (int)len);
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p += len;
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}
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OPENSSL_free(ret->data);
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ret->data = s;
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ret->length = (int)len;
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if (a != NULL)
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(*a) = ret;
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*pp = p;
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return ret;
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err:
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ASN1err(ASN1_F_D2I_ASN1_UINTEGER, i);
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if ((a == NULL) || (*a != ret))
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ASN1_INTEGER_free(ret);
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return NULL;
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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 atype)
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{
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ASN1_INTEGER *ret;
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int len;
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if (ai == NULL) {
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ret = ASN1_STRING_type_new(atype);
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} else {
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ret = ai;
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ret->type = atype;
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}
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if (ret == NULL) {
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ASN1err(ASN1_F_BN_TO_ASN1_STRING, ERR_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 |= V_ASN1_NEG_INTEGER;
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len = BN_num_bytes(bn);
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if (len == 0)
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len = 1;
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if (ASN1_STRING_set(ret, NULL, len) == 0) {
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ASN1err(ASN1_F_BN_TO_ASN1_STRING, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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/* Correct zero case */
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if (BN_is_zero(bn))
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ret->data[0] = 0;
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else
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len = BN_bn2bin(bn, ret->data);
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ret->length = len;
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return ret;
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err:
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if (ret != ai)
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ASN1_INTEGER_free(ret);
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return NULL;
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}
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static BIGNUM *asn1_string_to_bn(const ASN1_INTEGER *ai, BIGNUM *bn,
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int itype)
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{
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BIGNUM *ret;
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if ((ai->type & ~V_ASN1_NEG) != itype) {
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ASN1err(ASN1_F_ASN1_STRING_TO_BN, ASN1_R_WRONG_INTEGER_TYPE);
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return NULL;
|
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}
|
|
|
|
ret = BN_bin2bn(ai->data, ai->length, bn);
|
|
if (ret == NULL) {
|
|
ASN1err(ASN1_F_ASN1_STRING_TO_BN, ASN1_R_BN_LIB);
|
|
return NULL;
|
|
}
|
|
if (ai->type & V_ASN1_NEG)
|
|
BN_set_negative(ret, 1);
|
|
return ret;
|
|
}
|
|
|
|
int ASN1_INTEGER_get_int64(int64_t *pr, const ASN1_INTEGER *a)
|
|
{
|
|
return asn1_string_get_int64(pr, a, V_ASN1_INTEGER);
|
|
}
|
|
|
|
int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t r)
|
|
{
|
|
return asn1_string_set_int64(a, r, V_ASN1_INTEGER);
|
|
}
|
|
|
|
int ASN1_INTEGER_get_uint64(uint64_t *pr, const ASN1_INTEGER *a)
|
|
{
|
|
return asn1_string_get_uint64(pr, a, V_ASN1_INTEGER);
|
|
}
|
|
|
|
int ASN1_INTEGER_set_uint64(ASN1_INTEGER *a, uint64_t r)
|
|
{
|
|
return asn1_string_set_uint64(a, r, V_ASN1_INTEGER);
|
|
}
|
|
|
|
int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
|
|
{
|
|
return ASN1_INTEGER_set_int64(a, v);
|
|
}
|
|
|
|
long ASN1_INTEGER_get(const ASN1_INTEGER *a)
|
|
{
|
|
int i;
|
|
int64_t r;
|
|
if (a == NULL)
|
|
return 0;
|
|
i = ASN1_INTEGER_get_int64(&r, a);
|
|
if (i == 0)
|
|
return -1;
|
|
if (r > LONG_MAX || r < LONG_MIN)
|
|
return -1;
|
|
return (long)r;
|
|
}
|
|
|
|
ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
|
|
{
|
|
return bn_to_asn1_string(bn, ai, V_ASN1_INTEGER);
|
|
}
|
|
|
|
BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
|
|
{
|
|
return asn1_string_to_bn(ai, bn, V_ASN1_INTEGER);
|
|
}
|
|
|
|
int ASN1_ENUMERATED_get_int64(int64_t *pr, const ASN1_ENUMERATED *a)
|
|
{
|
|
return asn1_string_get_int64(pr, a, V_ASN1_ENUMERATED);
|
|
}
|
|
|
|
int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t r)
|
|
{
|
|
return asn1_string_set_int64(a, r, V_ASN1_ENUMERATED);
|
|
}
|
|
|
|
int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
|
|
{
|
|
return ASN1_ENUMERATED_set_int64(a, v);
|
|
}
|
|
|
|
long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a)
|
|
{
|
|
int i;
|
|
int64_t r;
|
|
if (a == NULL)
|
|
return 0;
|
|
if ((a->type & ~V_ASN1_NEG) != V_ASN1_ENUMERATED)
|
|
return -1;
|
|
if (a->length > (int)sizeof(long))
|
|
return 0xffffffffL;
|
|
i = ASN1_ENUMERATED_get_int64(&r, a);
|
|
if (i == 0)
|
|
return -1;
|
|
if (r > LONG_MAX || r < LONG_MIN)
|
|
return -1;
|
|
return (long)r;
|
|
}
|
|
|
|
ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai)
|
|
{
|
|
return bn_to_asn1_string(bn, ai, V_ASN1_ENUMERATED);
|
|
}
|
|
|
|
BIGNUM *ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn)
|
|
{
|
|
return asn1_string_to_bn(ai, bn, V_ASN1_ENUMERATED);
|
|
}
|
|
|
|
/* Internal functions used by x_int64.c */
|
|
int c2i_uint64_int(uint64_t *ret, int *neg, const unsigned char **pp, long len)
|
|
{
|
|
unsigned char buf[sizeof(uint64_t)];
|
|
size_t buflen;
|
|
|
|
buflen = c2i_ibuf(NULL, NULL, *pp, len);
|
|
if (buflen == 0)
|
|
return 0;
|
|
if (buflen > sizeof(uint64_t)) {
|
|
ASN1err(ASN1_F_C2I_UINT64_INT, ASN1_R_TOO_LARGE);
|
|
return 0;
|
|
}
|
|
(void)c2i_ibuf(buf, neg, *pp, len);
|
|
return asn1_get_uint64(ret, buf, buflen);
|
|
}
|
|
|
|
int i2c_uint64_int(unsigned char *p, uint64_t r, int neg)
|
|
{
|
|
unsigned char buf[sizeof(uint64_t)];
|
|
size_t off;
|
|
|
|
off = asn1_put_uint64(buf, r);
|
|
return i2c_ibuf(buf + off, sizeof(buf) - off, neg, &p);
|
|
}
|
|
|