blob: 5324c1ea14d87f318a4db8a86f699011f457422d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/* 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.
*/
#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
*/
/**
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 */
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
|
