/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
 */
#include "tomcrypt.h"

/** 
  @file pkcs_1_i2osp.c
  Integer to Octet I2OSP, Tom St Denis 
*/

#ifdef LTC_PKCS_1

/* always stores the same # of bytes, pads with leading zero bytes
   as required
 */

/**
   LTC_PKCS #1 Integer to binary
   @param n             The integer to store
   @param modulus_len   The length of the RSA modulus
   @param out           [out] The destination for the integer
   @return CRYPT_OK if successful
*/
int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out)
{
	unsigned long size;

	size = mp_unsigned_bin_size(n);

	if (size > modulus_len) {
		return CRYPT_BUFFER_OVERFLOW;
	}

	/* store it */
	zeromem(out, modulus_len);
	return mp_to_unsigned_bin(n, out + (modulus_len - size));
}

#endif /* LTC_PKCS_1 */

/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */
/* $Revision: 1.7 $ */
/* $Date: 2007/05/12 14:32:35 $ */