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comparison rsa_export.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
parents
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 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
17 {
18 unsigned long y, z;
19 int err;
20
21 _ARGCHK(out != NULL);
22 _ARGCHK(outlen != NULL);
23 _ARGCHK(key != NULL);
24
25 /* can we store the static header? */
26 if (*outlen < (PACKET_SIZE + 1)) {
27 return CRYPT_BUFFER_OVERFLOW;
28 }
29
30 /* type valid? */
31 if (!(key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) &&
32 (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED)) {
33 return CRYPT_PK_INVALID_TYPE;
34 }
35
36 /* start at offset y=PACKET_SIZE */
37 y = PACKET_SIZE;
38
39 /* output key type */
40 out[y++] = type;
41
42 /* output modulus */
43 OUTPUT_BIGNUM(&key->N, out, y, z);
44
45 /* output public key */
46 OUTPUT_BIGNUM(&key->e, out, y, z);
47
48 if (type == PK_PRIVATE || type == PK_PRIVATE_OPTIMIZED) {
49 OUTPUT_BIGNUM(&key->d, out, y, z);
50 }
51
52 if (type == PK_PRIVATE_OPTIMIZED) {
53 OUTPUT_BIGNUM(&key->dQ, out, y, z);
54 OUTPUT_BIGNUM(&key->dP, out, y, z);
55 OUTPUT_BIGNUM(&key->pQ, out, y, z);
56 OUTPUT_BIGNUM(&key->qP, out, y, z);
57 OUTPUT_BIGNUM(&key->p, out, y, z);
58 OUTPUT_BIGNUM(&key->q, out, y, z);
59 }
60
61 /* store packet header */
62 packet_store_header(out, PACKET_SECT_RSA, PACKET_SUB_KEY);
63
64 /* copy to the user buffer */
65 *outlen = y;
66
67 /* clear stack and return */
68 return CRYPT_OK;
69 }
70
71 #endif /* MRSA */
72