Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +0800
parents 6dba84798cd5
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file pkcs_1_i2osp.c
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13 Integer to Octet I2OSP, Tom St Denis
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14 */
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16 #ifdef LTC_PKCS_1
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18 /* always stores the same # of bytes, pads with leading zero bytes
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19 as required
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20 */
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22 /**
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23 PKCS #1 Integer to binary
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24 @param n The integer to store
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25 @param modulus_len The length of the RSA modulus
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26 @param out [out] The destination for the integer
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27 @return CRYPT_OK if successful
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28 */
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29 int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out)
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30 {
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31 unsigned long size;
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33 size = mp_unsigned_bin_size(n);
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35 if (size > modulus_len) {
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36 return CRYPT_BUFFER_OVERFLOW;
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37 }
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39 /* store it */
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40 zeromem(out, modulus_len);
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41 return mp_to_unsigned_bin(n, out+(modulus_len-size));
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42 }
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44 #endif /* LTC_PKCS_1 */
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47 /* ref: $Format:%D$ */
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48 /* git commit: $Format:%H$ */
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49 /* commit time: $Format:%ai$ */