--- /dev/null
+/* 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 <openssl/asn1.h>
+
+#include <string.h>
+#include <limits.h>
+
+#include <openssl/err.h>
+#include <openssl/mem.h>
+
+#include "../internal.h"
+
+
+ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x)
+{
+ return M_ASN1_INTEGER_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 an ASN1 INTEGER into its content encoding.
+ * 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: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
+ *
+ * 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.
+ */
+
+int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
+{
+ int pad = 0, ret, i, neg;
+ unsigned char *p, *n, pb = 0;
+
+ if (a == NULL)
+ return (0);
+ neg = a->type & V_ASN1_NEG;
+ if (a->length == 0)
+ ret = 1;
+ else {
+ ret = a->length;
+ i = a->data[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 < a->length; i++)
+ if (a->data[i]) {
+ pad = 1;
+ pb = 0xFF;
+ break;
+ }
+ }
+ }
+ ret += pad;
+ }
+ if (pp == NULL)
+ return (ret);
+ p = *pp;
+
+ if (pad)
+ *(p++) = pb;
+ if (a->length == 0)
+ *(p++) = 0;
+ else if (!neg)
+ OPENSSL_memcpy(p, a->data, (unsigned int)a->length);
+ else {
+ /* Begin at the end of the encoding */
+ n = a->data + a->length - 1;
+ p += a->length - 1;
+ i = a->length;
+ /* 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 just 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;
+ const unsigned char *p, *pend;
+ unsigned char *to, *s;
+ int i;
+
+ if ((a == NULL) || ((*a) == NULL)) {
+ if ((ret = M_ASN1_INTEGER_new()) == NULL)
+ return (NULL);
+ ret->type = V_ASN1_INTEGER;
+ } else
+ ret = (*a);
+
+ p = *pp;
+ pend = p + len;
+
+ /*
+ * We must OPENSSL_malloc stuff, even for 0 bytes otherwise it signifies
+ * a missing NULL parameter.
+ */
+ s = (unsigned char *)OPENSSL_malloc((int)len + 1);
+ if (s == NULL) {
+ i = ERR_R_MALLOC_FAILURE;
+ goto err;
+ }
+ to = s;
+ if (!len) {
+ /*
+ * Strictly speaking this is an illegal INTEGER but we tolerate it.
+ */
+ ret->type = V_ASN1_INTEGER;
+ } else if (*p & 0x80) { /* a negative number */
+ ret->type = V_ASN1_NEG_INTEGER;
+ if ((*p == 0xff) && (len != 1)) {
+ p++;
+ len--;
+ }
+ i = len;
+ p += i - 1;
+ to += i - 1;
+ while ((!*p) && i) {
+ *(to--) = 0;
+ i--;
+ p--;
+ }
+ /*
+ * Special case: if all zeros then the number will be of the form FF
+ * followed by n zero bytes: this corresponds to 1 followed by n zero
+ * bytes. We've already written n zeros so we just append an extra
+ * one and set the first byte to a 1. This is treated separately
+ * because it is the only case where the number of bytes is larger
+ * than len.
+ */
+ if (!i) {
+ *s = 1;
+ s[len] = 0;
+ len++;
+ } else {
+ *(to--) = (*(p--) ^ 0xff) + 1;
+ i--;
+ for (; i > 0; i--)
+ *(to--) = *(p--) ^ 0xff;
+ }
+ } else {
+ ret->type = V_ASN1_INTEGER;
+ if ((*p == 0) && (len != 1)) {
+ p++;
+ len--;
+ }
+ OPENSSL_memcpy(s, p, (int)len);
+ }
+
+ if (ret->data != NULL)
+ OPENSSL_free(ret->data);
+ ret->data = s;
+ ret->length = (int)len;
+ if (a != NULL)
+ (*a) = ret;
+ *pp = pend;
+ return (ret);
+ err:
+ OPENSSL_PUT_ERROR(ASN1, i);
+ if ((ret != NULL) && ((a == NULL) || (*a != ret)))
+ M_ASN1_INTEGER_free(ret);
+ return (NULL);
+}
+
+/*
+ * 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 = M_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 = (unsigned char *)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--;
+ }
+ OPENSSL_memcpy(s, p, (int)len);
+ p += len;
+ }
+
+ if (ret->data != NULL)
+ OPENSSL_free(ret->data);
+ ret->data = s;
+ ret->length = (int)len;
+ if (a != NULL)
+ (*a) = ret;
+ *pp = p;
+ return (ret);
+ err:
+ OPENSSL_PUT_ERROR(ASN1, i);
+ if ((ret != NULL) && ((a == NULL) || (*a != ret)))
+ M_ASN1_INTEGER_free(ret);
+ return (NULL);
+}
+
+int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
+{
+ if (v >= 0) {
+ return ASN1_INTEGER_set_uint64(a, (uint64_t) v);
+ }
+
+ if (!ASN1_INTEGER_set_uint64(a, 0 - (uint64_t) v)) {
+ return 0;
+ }
+
+ a->type = V_ASN1_NEG_INTEGER;
+ return 1;
+}
+
+int ASN1_INTEGER_set_uint64(ASN1_INTEGER *out, uint64_t v)
+{
+ uint8_t *const newdata = OPENSSL_malloc(sizeof(uint64_t));
+ if (newdata == NULL) {
+ OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ OPENSSL_free(out->data);
+ out->data = newdata;
+ v = CRYPTO_bswap8(v);
+ memcpy(out->data, &v, sizeof(v));
+
+ out->type = V_ASN1_INTEGER;
+
+ size_t leading_zeros;
+ for (leading_zeros = 0; leading_zeros < sizeof(uint64_t) - 1;
+ leading_zeros++) {
+ if (out->data[leading_zeros] != 0) {
+ break;
+ }
+ }
+
+ out->length = sizeof(uint64_t) - leading_zeros;
+ OPENSSL_memmove(out->data, out->data + leading_zeros, out->length);
+
+ return 1;
+}
+
+long ASN1_INTEGER_get(const ASN1_INTEGER *a)
+{
+ int neg = 0, i;
+
+ if (a == NULL)
+ return (0L);
+ i = a->type;
+ if (i == V_ASN1_NEG_INTEGER)
+ neg = 1;
+ else if (i != V_ASN1_INTEGER)
+ return -1;
+
+ OPENSSL_COMPILE_ASSERT(sizeof(uint64_t) >= sizeof(long),
+ long_larger_than_uint64_t);
+
+ if (a->length > (int)sizeof(uint64_t)) {
+ /* hmm... a bit ugly, return all ones */
+ return -1;
+ }
+
+ uint64_t r64 = 0;
+ if (a->data != NULL) {
+ for (i = 0; i < a->length; i++) {
+ r64 <<= 8;
+ r64 |= (unsigned char)a->data[i];
+ }
+
+ if (r64 > LONG_MAX) {
+ return -1;
+ }
+ }
+
+ long r = (long) r64;
+ if (neg)
+ r = -r;
+
+ return r;
+}
+
+ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
+{
+ ASN1_INTEGER *ret;
+ int len, j;
+
+ if (ai == NULL)
+ ret = M_ASN1_INTEGER_new();
+ else
+ ret = ai;
+ if (ret == NULL) {
+ OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
+ goto err;
+ }
+ if (BN_is_negative(bn) && !BN_is_zero(bn))
+ ret->type = V_ASN1_NEG_INTEGER;
+ else
+ ret->type = V_ASN1_INTEGER;
+ j = BN_num_bits(bn);
+ len = ((j == 0) ? 0 : ((j / 8) + 1));
+ if (ret->length < len + 4) {
+ unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
+ if (!new_data) {
+ OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ ret->data = new_data;
+ }
+ ret->length = BN_bn2bin(bn, ret->data);
+ /* Correct zero case */
+ if (!ret->length) {
+ ret->data[0] = 0;
+ ret->length = 1;
+ }
+ return (ret);
+ err:
+ if (ret != ai)
+ M_ASN1_INTEGER_free(ret);
+ return (NULL);
+}
+
+BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
+{
+ BIGNUM *ret;
+
+ if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
+ OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
+ else if (ai->type == V_ASN1_NEG_INTEGER)
+ BN_set_negative(ret, 1);
+ return (ret);
+}
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