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annotate pkcs_1_i2osp.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +0000
parents d7da3b1e1540
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "mycrypt.h"
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12
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13 /* Integer to Octet I2OSP -- Tom St Denis */
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15 #ifdef PKCS_1
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17 /* always stores the same # of bytes, pads with leading zero bytes
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18 as required
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19 */
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20 int pkcs_1_i2osp(mp_int *n, unsigned long modulus_len, unsigned char *out)
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21 {
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22 int err;
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23 unsigned long size;
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25 size = mp_unsigned_bin_size(n);
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27 if (size > modulus_len) {
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28 return CRYPT_BUFFER_OVERFLOW;
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29 }
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31 /* store it */
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32 zeromem(out, modulus_len);
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33 if ((err = mp_to_unsigned_bin(n, out+(modulus_len-size))) != MP_OKAY) {
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34 return mpi_to_ltc_error(err);
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35 }
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36 return CRYPT_OK;
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37 }
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39 #endif /* PKCS_1 */
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