--- /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/bn.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+
+#include <openssl/bio.h>
+#include <openssl/bytestring.h>
+#include <openssl/err.h>
+#include <openssl/mem.h>
+
+#include "../fipsmodule/bn/internal.h"
+
+
+int BN_bn2cbb_padded(CBB *out, size_t len, const BIGNUM *in) {
+ uint8_t *ptr;
+ return CBB_add_space(out, &ptr, len) && BN_bn2bin_padded(ptr, len, in);
+}
+
+static const char hextable[] = "0123456789abcdef";
+
+char *BN_bn2hex(const BIGNUM *bn) {
+ int width = bn_minimal_width(bn);
+ char *buf = OPENSSL_malloc(1 /* leading '-' */ + 1 /* zero is non-empty */ +
+ width * BN_BYTES * 2 + 1 /* trailing NUL */);
+ if (buf == NULL) {
+ OPENSSL_PUT_ERROR(BN, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ char *p = buf;
+ if (bn->neg) {
+ *(p++) = '-';
+ }
+
+ if (BN_is_zero(bn)) {
+ *(p++) = '0';
+ }
+
+ int z = 0;
+ for (int i = width - 1; i >= 0; i--) {
+ for (int j = BN_BITS2 - 8; j >= 0; j -= 8) {
+ // strip leading zeros
+ int v = ((int)(bn->d[i] >> (long)j)) & 0xff;
+ if (z || v != 0) {
+ *(p++) = hextable[v >> 4];
+ *(p++) = hextable[v & 0x0f];
+ z = 1;
+ }
+ }
+ }
+ *p = '\0';
+
+ return buf;
+}
+
+// decode_hex decodes |in_len| bytes of hex data from |in| and updates |bn|.
+static int decode_hex(BIGNUM *bn, const char *in, int in_len) {
+ if (in_len > INT_MAX/4) {
+ OPENSSL_PUT_ERROR(BN, BN_R_BIGNUM_TOO_LONG);
+ return 0;
+ }
+ // |in_len| is the number of hex digits.
+ if (!bn_expand(bn, in_len * 4)) {
+ return 0;
+ }
+
+ int i = 0;
+ while (in_len > 0) {
+ // Decode one |BN_ULONG| at a time.
+ int todo = BN_BYTES * 2;
+ if (todo > in_len) {
+ todo = in_len;
+ }
+
+ BN_ULONG word = 0;
+ int j;
+ for (j = todo; j > 0; j--) {
+ char c = in[in_len - j];
+
+ BN_ULONG hex;
+ if (c >= '0' && c <= '9') {
+ hex = c - '0';
+ } else if (c >= 'a' && c <= 'f') {
+ hex = c - 'a' + 10;
+ } else if (c >= 'A' && c <= 'F') {
+ hex = c - 'A' + 10;
+ } else {
+ hex = 0;
+ // This shouldn't happen. The caller checks |isxdigit|.
+ assert(0);
+ }
+ word = (word << 4) | hex;
+ }
+
+ bn->d[i++] = word;
+ in_len -= todo;
+ }
+ assert(i <= bn->dmax);
+ bn->width = i;
+ return 1;
+}
+
+// decode_dec decodes |in_len| bytes of decimal data from |in| and updates |bn|.
+static int decode_dec(BIGNUM *bn, const char *in, int in_len) {
+ int i, j;
+ BN_ULONG l = 0;
+
+ // Decode |BN_DEC_NUM| digits at a time.
+ j = BN_DEC_NUM - (in_len % BN_DEC_NUM);
+ if (j == BN_DEC_NUM) {
+ j = 0;
+ }
+ l = 0;
+ for (i = 0; i < in_len; i++) {
+ l *= 10;
+ l += in[i] - '0';
+ if (++j == BN_DEC_NUM) {
+ if (!BN_mul_word(bn, BN_DEC_CONV) ||
+ !BN_add_word(bn, l)) {
+ return 0;
+ }
+ l = 0;
+ j = 0;
+ }
+ }
+ return 1;
+}
+
+typedef int (*decode_func) (BIGNUM *bn, const char *in, int in_len);
+typedef int (*char_test_func) (int c);
+
+static int bn_x2bn(BIGNUM **outp, const char *in, decode_func decode, char_test_func want_char) {
+ BIGNUM *ret = NULL;
+ int neg = 0, i;
+ int num;
+
+ if (in == NULL || *in == 0) {
+ return 0;
+ }
+
+ if (*in == '-') {
+ neg = 1;
+ in++;
+ }
+
+ for (i = 0; want_char((unsigned char)in[i]) && i + neg < INT_MAX; i++) {}
+
+ num = i + neg;
+ if (outp == NULL) {
+ return num;
+ }
+
+ // in is the start of the hex digits, and it is 'i' long
+ if (*outp == NULL) {
+ ret = BN_new();
+ if (ret == NULL) {
+ return 0;
+ }
+ } else {
+ ret = *outp;
+ BN_zero(ret);
+ }
+
+ if (!decode(ret, in, i)) {
+ goto err;
+ }
+
+ bn_set_minimal_width(ret);
+ if (!BN_is_zero(ret)) {
+ ret->neg = neg;
+ }
+
+ *outp = ret;
+ return num;
+
+err:
+ if (*outp == NULL) {
+ BN_free(ret);
+ }
+
+ return 0;
+}
+
+int BN_hex2bn(BIGNUM **outp, const char *in) {
+ return bn_x2bn(outp, in, decode_hex, isxdigit);
+}
+
+char *BN_bn2dec(const BIGNUM *a) {
+ // It is easier to print strings little-endian, so we assemble it in reverse
+ // and fix at the end.
+ BIGNUM *copy = NULL;
+ CBB cbb;
+ if (!CBB_init(&cbb, 16) ||
+ !CBB_add_u8(&cbb, 0 /* trailing NUL */)) {
+ goto cbb_err;
+ }
+
+ if (BN_is_zero(a)) {
+ if (!CBB_add_u8(&cbb, '0')) {
+ goto cbb_err;
+ }
+ } else {
+ copy = BN_dup(a);
+ if (copy == NULL) {
+ goto err;
+ }
+
+ while (!BN_is_zero(copy)) {
+ BN_ULONG word = BN_div_word(copy, BN_DEC_CONV);
+ if (word == (BN_ULONG)-1) {
+ goto err;
+ }
+
+ const int add_leading_zeros = !BN_is_zero(copy);
+ for (int i = 0; i < BN_DEC_NUM && (add_leading_zeros || word != 0); i++) {
+ if (!CBB_add_u8(&cbb, '0' + word % 10)) {
+ goto cbb_err;
+ }
+ word /= 10;
+ }
+ assert(word == 0);
+ }
+ }
+
+ if (BN_is_negative(a) &&
+ !CBB_add_u8(&cbb, '-')) {
+ goto cbb_err;
+ }
+
+ uint8_t *data;
+ size_t len;
+ if (!CBB_finish(&cbb, &data, &len)) {
+ goto cbb_err;
+ }
+
+ // Reverse the buffer.
+ for (size_t i = 0; i < len/2; i++) {
+ uint8_t tmp = data[i];
+ data[i] = data[len - 1 - i];
+ data[len - 1 - i] = tmp;
+ }
+
+ BN_free(copy);
+ return (char *)data;
+
+cbb_err:
+ OPENSSL_PUT_ERROR(BN, ERR_R_MALLOC_FAILURE);
+err:
+ BN_free(copy);
+ CBB_cleanup(&cbb);
+ return NULL;
+}
+
+int BN_dec2bn(BIGNUM **outp, const char *in) {
+ return bn_x2bn(outp, in, decode_dec, isdigit);
+}
+
+int BN_asc2bn(BIGNUM **outp, const char *in) {
+ const char *const orig_in = in;
+ if (*in == '-') {
+ in++;
+ }
+
+ if (in[0] == '0' && (in[1] == 'X' || in[1] == 'x')) {
+ if (!BN_hex2bn(outp, in+2)) {
+ return 0;
+ }
+ } else {
+ if (!BN_dec2bn(outp, in)) {
+ return 0;
+ }
+ }
+
+ if (*orig_in == '-' && !BN_is_zero(*outp)) {
+ (*outp)->neg = 1;
+ }
+
+ return 1;
+}
+
+int BN_print(BIO *bp, const BIGNUM *a) {
+ int i, j, v, z = 0;
+ int ret = 0;
+
+ if (a->neg && BIO_write(bp, "-", 1) != 1) {
+ goto end;
+ }
+
+ if (BN_is_zero(a) && BIO_write(bp, "0", 1) != 1) {
+ goto end;
+ }
+
+ for (i = bn_minimal_width(a) - 1; i >= 0; i--) {
+ for (j = BN_BITS2 - 4; j >= 0; j -= 4) {
+ // strip leading zeros
+ v = ((int)(a->d[i] >> (long)j)) & 0x0f;
+ if (z || v != 0) {
+ if (BIO_write(bp, &hextable[v], 1) != 1) {
+ goto end;
+ }
+ z = 1;
+ }
+ }
+ }
+ ret = 1;
+
+end:
+ return ret;
+}
+
+int BN_print_fp(FILE *fp, const BIGNUM *a) {
+ BIO *b;
+ int ret;
+
+ b = BIO_new(BIO_s_file());
+ if (b == NULL) {
+ return 0;
+ }
+ BIO_set_fp(b, fp, BIO_NOCLOSE);
+ ret = BN_print(b, a);
+ BIO_free(b);
+
+ return ret;
+}
+
+
+size_t BN_bn2mpi(const BIGNUM *in, uint8_t *out) {
+ const size_t bits = BN_num_bits(in);
+ const size_t bytes = (bits + 7) / 8;
+ // If the number of bits is a multiple of 8, i.e. if the MSB is set,
+ // prefix with a zero byte.
+ int extend = 0;
+ if (bytes != 0 && (bits & 0x07) == 0) {
+ extend = 1;
+ }
+
+ const size_t len = bytes + extend;
+ if (len < bytes ||
+ 4 + len < len ||
+ (len & 0xffffffff) != len) {
+ // If we cannot represent the number then we emit zero as the interface
+ // doesn't allow an error to be signalled.
+ if (out) {
+ OPENSSL_memset(out, 0, 4);
+ }
+ return 4;
+ }
+
+ if (out == NULL) {
+ return 4 + len;
+ }
+
+ out[0] = len >> 24;
+ out[1] = len >> 16;
+ out[2] = len >> 8;
+ out[3] = len;
+ if (extend) {
+ out[4] = 0;
+ }
+ BN_bn2bin(in, out + 4 + extend);
+ if (in->neg && len > 0) {
+ out[4] |= 0x80;
+ }
+ return len + 4;
+}
+
+BIGNUM *BN_mpi2bn(const uint8_t *in, size_t len, BIGNUM *out) {
+ if (len < 4) {
+ OPENSSL_PUT_ERROR(BN, BN_R_BAD_ENCODING);
+ return NULL;
+ }
+ const size_t in_len = ((size_t)in[0] << 24) |
+ ((size_t)in[1] << 16) |
+ ((size_t)in[2] << 8) |
+ ((size_t)in[3]);
+ if (in_len != len - 4) {
+ OPENSSL_PUT_ERROR(BN, BN_R_BAD_ENCODING);
+ return NULL;
+ }
+
+ int out_is_alloced = 0;
+ if (out == NULL) {
+ out = BN_new();
+ if (out == NULL) {
+ OPENSSL_PUT_ERROR(BN, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+ out_is_alloced = 1;
+ }
+
+ if (in_len == 0) {
+ BN_zero(out);
+ return out;
+ }
+
+ in += 4;
+ if (BN_bin2bn(in, in_len, out) == NULL) {
+ if (out_is_alloced) {
+ BN_free(out);
+ }
+ return NULL;
+ }
+ out->neg = ((*in) & 0x80) != 0;
+ if (out->neg) {
+ BN_clear_bit(out, BN_num_bits(out) - 1);
+ }
+ return out;
+}
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