--- /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 <limits.h>
+
+#include "internal.h"
+
+
+BIGNUM *BN_bin2bn(const uint8_t *in, size_t len, BIGNUM *ret) {
+ size_t num_words;
+ unsigned m;
+ BN_ULONG word = 0;
+ BIGNUM *bn = NULL;
+
+ if (ret == NULL) {
+ ret = bn = BN_new();
+ }
+
+ if (ret == NULL) {
+ return NULL;
+ }
+
+ if (len == 0) {
+ ret->width = 0;
+ return ret;
+ }
+
+ num_words = ((len - 1) / BN_BYTES) + 1;
+ m = (len - 1) % BN_BYTES;
+ if (!bn_wexpand(ret, num_words)) {
+ if (bn) {
+ BN_free(bn);
+ }
+ return NULL;
+ }
+
+ // |bn_wexpand| must check bounds on |num_words| to write it into
+ // |ret->dmax|.
+ assert(num_words <= INT_MAX);
+ ret->width = (int)num_words;
+ ret->neg = 0;
+
+ while (len--) {
+ word = (word << 8) | *(in++);
+ if (m-- == 0) {
+ ret->d[--num_words] = word;
+ word = 0;
+ m = BN_BYTES - 1;
+ }
+ }
+
+ return ret;
+}
+
+BIGNUM *BN_le2bn(const uint8_t *in, size_t len, BIGNUM *ret) {
+ BIGNUM *bn = NULL;
+ if (ret == NULL) {
+ bn = BN_new();
+ ret = bn;
+ }
+
+ if (ret == NULL) {
+ return NULL;
+ }
+
+ if (len == 0) {
+ ret->width = 0;
+ ret->neg = 0;
+ return ret;
+ }
+
+ // Reserve enough space in |ret|.
+ size_t num_words = ((len - 1) / BN_BYTES) + 1;
+ if (!bn_wexpand(ret, num_words)) {
+ BN_free(bn);
+ return NULL;
+ }
+ ret->width = num_words;
+
+ // Make sure the top bytes will be zeroed.
+ ret->d[num_words - 1] = 0;
+
+ // We only support little-endian platforms, so we can simply memcpy the
+ // internal representation.
+ OPENSSL_memcpy(ret->d, in, len);
+ return ret;
+}
+
+size_t BN_bn2bin(const BIGNUM *in, uint8_t *out) {
+ size_t n, i;
+ BN_ULONG l;
+
+ n = i = BN_num_bytes(in);
+ while (i--) {
+ l = in->d[i / BN_BYTES];
+ *(out++) = (unsigned char)(l >> (8 * (i % BN_BYTES))) & 0xff;
+ }
+ return n;
+}
+
+static int fits_in_bytes(const uint8_t *bytes, size_t num_bytes, size_t len) {
+ uint8_t mask = 0;
+ for (size_t i = len; i < num_bytes; i++) {
+ mask |= bytes[i];
+ }
+ return mask == 0;
+}
+
+int BN_bn2le_padded(uint8_t *out, size_t len, const BIGNUM *in) {
+ const uint8_t *bytes = (const uint8_t *)in->d;
+ size_t num_bytes = in->width * BN_BYTES;
+ if (len < num_bytes) {
+ if (!fits_in_bytes(bytes, num_bytes, len)) {
+ return 0;
+ }
+ num_bytes = len;
+ }
+
+ // We only support little-endian platforms, so we can simply memcpy into the
+ // internal representation.
+ OPENSSL_memcpy(out, bytes, num_bytes);
+ // Pad out the rest of the buffer with zeroes.
+ OPENSSL_memset(out + num_bytes, 0, len - num_bytes);
+ return 1;
+}
+
+int BN_bn2bin_padded(uint8_t *out, size_t len, const BIGNUM *in) {
+ const uint8_t *bytes = (const uint8_t *)in->d;
+ size_t num_bytes = in->width * BN_BYTES;
+ if (len < num_bytes) {
+ if (!fits_in_bytes(bytes, num_bytes, len)) {
+ return 0;
+ }
+ num_bytes = len;
+ }
+
+ // We only support little-endian platforms, so we can simply write the buffer
+ // in reverse.
+ for (size_t i = 0; i < num_bytes; i++) {
+ out[len - i - 1] = bytes[i];
+ }
+ // Pad out the rest of the buffer with zeroes.
+ OPENSSL_memset(out, 0, len - num_bytes);
+ return 1;
+}
+
+BN_ULONG BN_get_word(const BIGNUM *bn) {
+ switch (bn_minimal_width(bn)) {
+ case 0:
+ return 0;
+ case 1:
+ return bn->d[0];
+ default:
+ return BN_MASK2;
+ }
+}
+
+int BN_get_u64(const BIGNUM *bn, uint64_t *out) {
+ switch (bn_minimal_width(bn)) {
+ case 0:
+ *out = 0;
+ return 1;
+ case 1:
+ *out = bn->d[0];
+ return 1;
+#if defined(OPENSSL_32_BIT)
+ case 2:
+ *out = (uint64_t) bn->d[0] | (((uint64_t) bn->d[1]) << 32);
+ return 1;
+#endif
+ default:
+ return 0;
+ }
+}
git://repos.xcallymotion.com / motion2.git / blobdiff