2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
14 int BN_bn2mpi(const BIGNUM *a, unsigned char *d)
21 bits = BN_num_bits(a);
24 ext = ((bits & 0x07) == 0);
27 return (num + 4 + ext);
30 d[0] = (unsigned char)(l >> 24) & 0xff;
31 d[1] = (unsigned char)(l >> 16) & 0xff;
32 d[2] = (unsigned char)(l >> 8) & 0xff;
33 d[3] = (unsigned char)(l) & 0xff;
36 num = BN_bn2bin(a, &(d[4 + ext]));
39 return (num + 4 + ext);
42 BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *ain)
49 BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH);
52 len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) | (int)
55 BNerr(BN_F_BN_MPI2BN, BN_R_ENCODING_ERROR);
75 if (BN_bin2bn(d, (int)len, a) == NULL) {
82 BN_clear_bit(a, BN_num_bits(a) - 1);