Mercurial > dropbear

comparison libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c @ 293:9d110777f345 contrib-blacklist

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.dropbear' (head 7ad1775ed65e75dbece27fe6b65bf1a234db386a) to branch 'au.asn.ucc.matt.dropbear.contrib.blacklist' (head 1d86a4f0a401cc68c2670d821a2f6366c37af143)
author Matt Johnston <matt@ucc.asn.au>
date Fri, 10 Mar 2006 06:31:29 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
comparison
equal deleted inserted replaced
247:c07de41b53d7 293:9d110777f345
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file pkcs_1_i2osp.c
15 Integer to Octet I2OSP, Tom St Denis
16 */
17
18 #ifdef PKCS_1
19
20 /* always stores the same # of bytes, pads with leading zero bytes
21 as required
22 */
23
24 /**
25 PKCS #1 Integer to binary
26 @param n The integer to store
27 @param modulus_len The length of the RSA modulus
28 @param out [out] The destination for the integer
29 @return CRYPT_OK if successful
30 */
31 int pkcs_1_i2osp(mp_int *n, unsigned long modulus_len, unsigned char *out)
32 {
33 int err;
34 unsigned long size;
35
36 size = mp_unsigned_bin_size(n);
37
38 if (size > modulus_len) {
39 return CRYPT_BUFFER_OVERFLOW;
40 }
41
42 /* store it */
43 zeromem(out, modulus_len);
44 if ((err = mp_to_unsigned_bin(n, out+(modulus_len-size))) != MP_OKAY) {
45 return mpi_to_ltc_error(err);
46 }
47 return CRYPT_OK;
48 }
49
50 #endif /* PKCS_1 */
51
52
53 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */
54 /* $Revision: 1.3 $ */
55 /* $Date: 2005/05/05 14:35:59 $ */