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comparison rsa_encrypt_key.c @ 15:6362d3854bb4 libtomcrypt-orig

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0.96 release of LibTomCrypt
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:07:21 +0000
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children 5d99163f7e32
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3:7faae8f46238 15:6362d3854bb4
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 /* OAEP pad then encrypt */
17 int rsa_encrypt_key(const unsigned char *inkey, unsigned long inlen,
18 unsigned char *outkey, unsigned long *outlen,
19 const unsigned char *lparam, unsigned long lparamlen,
20 prng_state *prng, int prng_idx, int hash_idx, 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 and hash ? */
31 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
32 return err;
33 }
34 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
35 return err;
36 }
37
38 /* get modulus len in bits */
39 modulus_bitlen = mp_count_bits(&(key->N));
40
41 /* outlen must be at least the size of the modulus */
42 modulus_bytelen = mp_unsigned_bin_size(&(key->N));
43 if (modulus_bytelen > *outlen) {
44 return CRYPT_BUFFER_OVERFLOW;
45 }
46
47 /* OAEP pad the key */
48 x = *outlen;
49 if ((err = pkcs_1_oaep_encode(inkey, inlen, lparam,
50 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
51 outkey, &x)) != CRYPT_OK) {
52 return err;
53 }
54
55 /* rsa exptmod the OAEP pad */
56 return rsa_exptmod(outkey, x, outkey, outlen, PK_PUBLIC, prng, prng_idx, key);
57 }
58
59 #endif /* MRSA */