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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
- #include <stdio.h>
- #include "internal/cryptlib.h"
- #include "internal/numbers.h"
- #include <limits.h>
- #include <openssl/asn1.h>
- #include <openssl/bn.h>
- #include "asn1_locl.h"
- ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x)
- {
- return ASN1_STRING_dup(x);
- }
- int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y)
- {
- int neg, ret;
- /* Compare signs */
- neg = x->type & V_ASN1_NEG;
- if (neg != (y->type & V_ASN1_NEG)) {
- if (neg)
- return -1;
- else
- return 1;
- }
- ret = ASN1_STRING_cmp(x, y);
- if (neg)
- return -ret;
- else
- return ret;
- }
- /*-
- * This converts a big endian buffer and sign into its content encoding.
- * This is used for INTEGER and ENUMERATED types.
- * The internal representation is an ASN1_STRING whose data is a big endian
- * representation of the value, ignoring the sign. The sign is determined by
- * the type: if type & V_ASN1_NEG is true it is negative, otherwise positive.
- *
- * Positive integers are no problem: they are almost the same as the DER
- * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
- *
- * Negative integers are a bit trickier...
- * The DER representation of negative integers is in 2s complement form.
- * The internal form is converted by complementing each octet and finally
- * adding one to the result. This can be done less messily with a little trick.
- * If the internal form has trailing zeroes then they will become FF by the
- * complement and 0 by the add one (due to carry) so just copy as many trailing
- * zeros to the destination as there are in the source. The carry will add one
- * to the last none zero octet: so complement this octet and add one and finally
- * complement any left over until you get to the start of the string.
- *
- * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
- * with 0xff. However if the first byte is 0x80 and one of the following bytes
- * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
- * followed by optional zeros isn't padded.
- */
- static size_t i2c_ibuf(const unsigned char *b, size_t blen, int neg,
- unsigned char **pp)
- {
- int pad = 0;
- size_t ret, i;
- unsigned char *p, pb = 0;
- const unsigned char *n;
- if (b == NULL || blen == 0)
- ret = 1;
- else {
- ret = blen;
- i = b[0];
- if (ret == 1 && i == 0)
- neg = 0;
- if (!neg && (i > 127)) {
- pad = 1;
- pb = 0;
- } else if (neg) {
- if (i > 128) {
- pad = 1;
- pb = 0xFF;
- } else if (i == 128) {
- /*
- * Special case: if any other bytes non zero we pad:
- * otherwise we don't.
- */
- for (i = 1; i < blen; i++)
- if (b[i]) {
- pad = 1;
- pb = 0xFF;
- break;
- }
- }
- }
- ret += pad;
- }
- if (pp == NULL)
- return ret;
- p = *pp;
- if (pad)
- *(p++) = pb;
- if (b == NULL || blen == 0)
- *p = 0;
- else if (!neg)
- memcpy(p, b, blen);
- else {
- /* Begin at the end of the encoding */
- n = b + blen - 1;
- p += blen - 1;
- i = blen;
- /* Copy zeros to destination as long as source is zero */
- while (!*n && i > 1) {
- *(p--) = 0;
- n--;
- i--;
- }
- /* Complement and increment next octet */
- *(p--) = ((*(n--)) ^ 0xff) + 1;
- i--;
- /* Complement any octets left */
- for (; i > 0; i--)
- *(p--) = *(n--) ^ 0xff;
- }
- *pp += ret;
- return ret;
- }
- /*
- * convert content octets into a big endian buffer. Returns the length
- * of buffer or 0 on error: for malformed INTEGER. If output bufer is
- * NULL just return length.
- */
- static size_t c2i_ibuf(unsigned char *b, int *pneg,
- const unsigned char *p, size_t plen)
- {
- size_t i;
- int neg, pad;
- /* Zero content length is illegal */
- if (plen == 0) {
- ASN1err(ASN1_F_C2I_IBUF, ASN1_R_ILLEGAL_ZERO_CONTENT);
- return 0;
- }
- neg = p[0] & 0x80;
- if (pneg)
- *pneg = neg;
- /* Handle common case where length is 1 octet separately */
- if (plen == 1) {
- if (b) {
- if (neg)
- b[0] = (p[0] ^ 0xFF) + 1;
- else
- b[0] = p[0];
- }
- return 1;
- }
- if (p[0] == 0 || p[0] == 0xFF)
- pad = 1;
- else
- pad = 0;
- /* reject illegal padding: first two octets MSB can't match */
- if (pad && (neg == (p[1] & 0x80))) {
- ASN1err(ASN1_F_C2I_IBUF, ASN1_R_ILLEGAL_PADDING);
- return 0;
- }
- /* If positive just copy across */
- if (neg == 0) {
- if (b)
- memcpy(b, p + pad, plen - pad);
- return plen - pad;
- }
- if (neg && pad) {
- /* check is any following octets are non zero */
- for (i = 1; i < plen; i++) {
- if (p[i] != 0)
- break;
- }
- /* if all bytes are zero handle as special case */
- if (i == plen) {
- if (b) {
- b[0] = 1;
- memset(b + 1, 0, plen - 1);
- }
- return plen;
- }
- }
- plen -= pad;
- /* Must be negative: calculate twos complement */
- if (b) {
- const unsigned char *from = p + plen - 1 + pad;
- unsigned char *to = b + plen - 1;
- i = plen;
- while (*from == 0 && i) {
- *to-- = 0;
- i--;
- from--;
- }
- *to-- = (*from-- ^ 0xff) + 1;
- OPENSSL_assert(i != 0);
- i--;
- for (; i > 0; i--)
- *to-- = *from-- ^ 0xff;
- }
- return plen;
- }
- int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
- {
- return i2c_ibuf(a->data, a->length, a->type & V_ASN1_NEG, pp);
- }
- /* Convert big endian buffer into uint64_t, return 0 on error */
- static int asn1_get_uint64(uint64_t *pr, const unsigned char *b, size_t blen)
- {
- size_t i;
- if (blen > sizeof(*pr)) {
- ASN1err(ASN1_F_ASN1_GET_UINT64, ASN1_R_TOO_LARGE);
- return 0;
- }
- *pr = 0;
- if (b == NULL)
- return 0;
- for (i = 0; i < blen; i++) {
- *pr <<= 8;
- *pr |= b[i];
- }
- return 1;
- }
- static size_t asn1_put_uint64(unsigned char *b, uint64_t r)
- {
- if (r >= 0x100) {
- unsigned char *p;
- uint64_t rtmp = r;
- size_t i = 0;
- /* Work out how many bytes we need */
- while (rtmp) {
- rtmp >>= 8;
- i++;
- }
- /* Copy from end to beginning */
- p = b + i - 1;
- do {
- *p-- = r & 0xFF;
- r >>= 8;
- } while (p >= b);
- return i;
- }
- b[0] = (unsigned char)r;
- return 1;
- }
- /*
- * Absolute value of INT64_MIN: we can't just use -INT64_MIN as it produces
- * overflow warnings.
- */
- #define ABS_INT64_MIN \
- ((uint64_t)INT64_MAX + (uint64_t)(-(INT64_MIN + INT64_MAX)))
- /* signed version of asn1_get_uint64 */
- static int asn1_get_int64(int64_t *pr, const unsigned char *b, size_t blen,
- int neg)
- {
- uint64_t r;
- if (asn1_get_uint64(&r, b, blen) == 0)
- return 0;
- if (neg) {
- if (r > ABS_INT64_MIN) {
- ASN1err(ASN1_F_ASN1_GET_INT64, ASN1_R_TOO_SMALL);
- return 0;
- }
- *pr = -(int64_t)r;
- } else {
- if (r > INT64_MAX) {
- ASN1err(ASN1_F_ASN1_GET_INT64, ASN1_R_TOO_LARGE);
- return 0;
- }
- *pr = (int64_t)r;
- }
- return 1;
- }
- /* Convert ASN1 INTEGER content octets to ASN1_INTEGER structure */
- ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp,
- long len)
- {
- ASN1_INTEGER *ret = NULL;
- size_t r;
- int neg;
- r = c2i_ibuf(NULL, NULL, *pp, len);
- if (r == 0)
- return NULL;
- if ((a == NULL) || ((*a) == NULL)) {
- ret = ASN1_INTEGER_new();
- if (ret == NULL)
- return NULL;
- ret->type = V_ASN1_INTEGER;
- } else
- ret = *a;
- if (ASN1_STRING_set(ret, NULL, r) == 0)
- goto err;
- c2i_ibuf(ret->data, &neg, *pp, len);
- if (neg)
- ret->type |= V_ASN1_NEG;
- *pp += len;
- if (a != NULL)
- (*a) = ret;
- return ret;
- err:
- ASN1err(ASN1_F_C2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
- if ((a == NULL) || (*a != ret))
- ASN1_INTEGER_free(ret);
- return NULL;
- }
- static int asn1_string_get_int64(int64_t *pr, const ASN1_STRING *a, int itype)
- {
- if (a == NULL) {
- ASN1err(ASN1_F_ASN1_STRING_GET_INT64, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- if ((a->type & ~V_ASN1_NEG) != itype) {
- ASN1err(ASN1_F_ASN1_STRING_GET_INT64, ASN1_R_WRONG_INTEGER_TYPE);
- return 0;
- }
- return asn1_get_int64(pr, a->data, a->length, a->type & V_ASN1_NEG);
- }
- static int asn1_string_set_int64(ASN1_STRING *a, int64_t r, int itype)
- {
- unsigned char tbuf[sizeof(r)];
- size_t l;
- a->type = itype;
- if (r < 0) {
- l = asn1_put_uint64(tbuf, -r);
- a->type |= V_ASN1_NEG;
- } else {
- l = asn1_put_uint64(tbuf, r);
- a->type &= ~V_ASN1_NEG;
- }
- if (l == 0)
- return 0;
- return ASN1_STRING_set(a, tbuf, l);
- }
- static int asn1_string_get_uint64(uint64_t *pr, const ASN1_STRING *a,
- int itype)
- {
- if (a == NULL) {
- ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- if ((a->type & ~V_ASN1_NEG) != itype) {
- ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ASN1_R_WRONG_INTEGER_TYPE);
- return 0;
- }
- if (a->type & V_ASN1_NEG) {
- ASN1err(ASN1_F_ASN1_STRING_GET_UINT64, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
- return 0;
- }
- return asn1_get_uint64(pr, a->data, a->length);
- }
- static int asn1_string_set_uint64(ASN1_STRING *a, uint64_t r, int itype)
- {
- unsigned char tbuf[sizeof(r)];
- size_t l;
- a->type = itype;
- l = asn1_put_uint64(tbuf, r);
- if (l == 0)
- return 0;
- return ASN1_STRING_set(a, tbuf, l);
- }
- /*
- * This is a version of d2i_ASN1_INTEGER that ignores the sign bit of ASN1
- * integers: some broken software can encode a positive INTEGER with its MSB
- * set as negative (it doesn't add a padding zero).
- */
- ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp,
- long length)
- {
- ASN1_INTEGER *ret = NULL;
- const unsigned char *p;
- unsigned char *s;
- long len;
- int inf, tag, xclass;
- int i;
- if ((a == NULL) || ((*a) == NULL)) {
- if ((ret = ASN1_INTEGER_new()) == NULL)
- return (NULL);
- ret->type = V_ASN1_INTEGER;
- } else
- ret = (*a);
- p = *pp;
- inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
- if (inf & 0x80) {
- i = ASN1_R_BAD_OBJECT_HEADER;
- goto err;
- }
- if (tag != V_ASN1_INTEGER) {
- i = ASN1_R_EXPECTING_AN_INTEGER;
- goto err;
- }
- /*
- * We must OPENSSL_malloc stuff, even for 0 bytes otherwise it signifies
- * a missing NULL parameter.
- */
- s = OPENSSL_malloc((int)len + 1);
- if (s == NULL) {
- i = ERR_R_MALLOC_FAILURE;
- goto err;
- }
- ret->type = V_ASN1_INTEGER;
- if (len) {
- if ((*p == 0) && (len != 1)) {
- p++;
- len--;
- }
- memcpy(s, p, (int)len);
- p += len;
- }
- OPENSSL_free(ret->data);
- ret->data = s;
- ret->length = (int)len;
- if (a != NULL)
- (*a) = ret;
- *pp = p;
- return (ret);
- err:
- ASN1err(ASN1_F_D2I_ASN1_UINTEGER, i);
- if ((a == NULL) || (*a != ret))
- ASN1_INTEGER_free(ret);
- return (NULL);
- }
- static ASN1_STRING *bn_to_asn1_string(const BIGNUM *bn, ASN1_STRING *ai,
- int atype)
- {
- ASN1_INTEGER *ret;
- int len;
- if (ai == NULL) {
- ret = ASN1_STRING_type_new(atype);
- } else {
- ret = ai;
- ret->type = atype;
- }
- if (ret == NULL) {
- ASN1err(ASN1_F_BN_TO_ASN1_STRING, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- }
- if (BN_is_negative(bn) && !BN_is_zero(bn))
- ret->type |= V_ASN1_NEG_INTEGER;
- len = BN_num_bytes(bn);
- if (len == 0)
- len = 1;
- if (ASN1_STRING_set(ret, NULL, len) == 0) {
- ASN1err(ASN1_F_BN_TO_ASN1_STRING, ERR_R_MALLOC_FAILURE);
- goto err;
- }
- /* Correct zero case */
- if (BN_is_zero(bn))
- ret->data[0] = 0;
- else
- len = BN_bn2bin(bn, ret->data);
- ret->length = len;
- return ret;
- err:
- if (ret != ai)
- ASN1_INTEGER_free(ret);
- return (NULL);
- }
- static BIGNUM *asn1_string_to_bn(const ASN1_INTEGER *ai, BIGNUM *bn,
- int itype)
- {
- BIGNUM *ret;
- if ((ai->type & ~V_ASN1_NEG) != itype) {
- ASN1err(ASN1_F_ASN1_STRING_TO_BN, ASN1_R_WRONG_INTEGER_TYPE);
- return NULL;
- }
- ret = BN_bin2bn(ai->data, ai->length, bn);
- if (ret == 0) {
- 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(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);
- }
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