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comparison rsa_v15_encrypt_key.c @ 143:5d99163f7e32 libtomcrypt-orig

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import of libtomcrypt 0.99
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:34:45 +0000
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15:6362d3854bb4 143:5d99163f7e32
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
12 #include "mycrypt.h"
13
14 #ifdef MRSA
15
16 /* PKCS #1 v1.5 pad then encrypt */
17 int rsa_v15_encrypt_key(const unsigned char *inkey, unsigned long inlen,
18 unsigned char *outkey, unsigned long *outlen,
19 prng_state *prng, int prng_idx,
20 rsa_key *key)
21 {
22 unsigned long modulus_bitlen, modulus_bytelen, x;
23 int err;
24
25 _ARGCHK(inkey != NULL);
26 _ARGCHK(outkey != NULL);
27 _ARGCHK(outlen != NULL);
28 _ARGCHK(key != NULL);
29
30 /* valid prng? */
31 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
32 return err;
33 }
34
35 /* get modulus len in bits */
36 modulus_bitlen = mp_count_bits(&(key->N));
37
38 /* outlen must be at least the size of the modulus */
39 modulus_bytelen = mp_unsigned_bin_size(&(key->N));
40 if (modulus_bytelen > *outlen) {
41 return CRYPT_BUFFER_OVERFLOW;
42 }
43
44 /* pad it */
45 x = *outlen;
46 if ((err = pkcs_1_v15_es_encode(inkey, inlen, modulus_bitlen, prng, prng_idx, outkey, &x)) != CRYPT_OK) {
47 return err;
48 }
49
50 /* encrypt it */
51 return rsa_exptmod(outkey, x, outkey, outlen, PK_PUBLIC, prng, prng_idx, key);
52 }
53
54 #endif