1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
6 * The library is free for all purposes without any express
9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
15 Integer to Octet I2OSP, Tom St Denis
20 /* always stores the same # of bytes, pads with leading zero bytes
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
31 int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out)
35 size = mp_unsigned_bin_size(n);
37 if (size > modulus_len) {
38 return CRYPT_BUFFER_OVERFLOW;
42 zeromem(out, modulus_len);
43 return mp_to_unsigned_bin(n, out+(modulus_len-size));
49 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */
50 /* $Revision: 1.5 $ */
51 /* $Date: 2006/03/31 14:15:35 $ */