| /* crypto/bn/bn_mpi.c */ |
| /* 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/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <stdio.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| #include "cryptlib.h" |
| #include "bn_lcl.h" |
| |
| int BN_bn2mpi(const BIGNUM *a, unsigned char *d) |
| { |
| int bits; |
| int num = 0; |
| int ext = 0; |
| long l; |
| |
| bits = BN_num_bits(a); |
| num = (bits + 7) / 8; |
| if (bits > 0) { |
| ext = ((bits & 0x07) == 0); |
| } |
| if (d == NULL) |
| return (num + 4 + ext); |
| |
| l = num + ext; |
| d[0] = (unsigned char)(l >> 24) & 0xff; |
| d[1] = (unsigned char)(l >> 16) & 0xff; |
| d[2] = (unsigned char)(l >> 8) & 0xff; |
| d[3] = (unsigned char)(l) & 0xff; |
| if (ext) |
| d[4] = 0; |
| num = BN_bn2bin(a, &(d[4 + ext])); |
| if (a->neg) |
| d[4] |= 0x80; |
| return (num + 4 + ext); |
| } |
| |
| BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a) |
| { |
| long len; |
| int neg = 0; |
| |
| if (n < 4) { |
| BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH); |
| return (NULL); |
| } |
| len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) | (int) |
| d[3]; |
| if ((len + 4) != n) { |
| BNerr(BN_F_BN_MPI2BN, BN_R_ENCODING_ERROR); |
| return (NULL); |
| } |
| |
| if (a == NULL) |
| a = BN_new(); |
| if (a == NULL) |
| return (NULL); |
| |
| if (len == 0) { |
| a->neg = 0; |
| a->top = 0; |
| return (a); |
| } |
| d += 4; |
| if ((*d) & 0x80) |
| neg = 1; |
| if (BN_bin2bn(d, (int)len, a) == NULL) |
| return (NULL); |
| a->neg = neg; |
| if (neg) { |
| BN_clear_bit(a, BN_num_bits(a) - 1); |
| } |
| bn_check_top(a); |
| return (a); |
| } |