Mercurial > dropbear

comparison libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 382:0cbe8f6dbf9e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f) to branch 'au.asn.ucc.matt.dropbear' (head 02c413252c90e9de8e03d91e9939dde3029f5c0a)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:41:05 +0000
parents 1b9e69c058d2
children f849a5ca2efc
comparison
equal deleted inserted replaced
379:b66a00272a90 382:0cbe8f6dbf9e
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 * 8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org 9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */ 10 */
11 #include "tomcrypt.h" 11 #include "tomcrypt.h"
12 12
13 /** 13 /**
14 @file rsa_encrypt_key.c 14 @file rsa_encrypt_key.c
15 RSA PKCS OAEP encryption, Tom St Denis 15 RSA PKCS #1 encryption, Tom St Denis and Andreas Lange
16 */ 16 */
17 17
18 #ifdef MRSA 18 #ifdef MRSA
19 19
20 /** 20 /**
21 (PKCS #1 v2.0) OAEP pad then encrypt 21 (PKCS #1 v2.0) OAEP pad then encrypt
26 @param lparam The system "lparam" for the encryption 26 @param lparam The system "lparam" for the encryption
27 @param lparamlen The length of lparam (octets) 27 @param lparamlen The length of lparam (octets)
28 @param prng An active PRNG 28 @param prng An active PRNG
29 @param prng_idx The index of the desired prng 29 @param prng_idx The index of the desired prng
30 @param hash_idx The index of the desired hash 30 @param hash_idx The index of the desired hash
31 @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5)
31 @param key The RSA key to encrypt to 32 @param key The RSA key to encrypt to
32 @return CRYPT_OK if successful 33 @return CRYPT_OK if successful
33 */ 34 */
34 int rsa_encrypt_key(const unsigned char *in, unsigned long inlen, 35 int rsa_encrypt_key_ex(const unsigned char *in, unsigned long inlen,
35 unsigned char *out, unsigned long *outlen, 36 unsigned char *out, unsigned long *outlen,
36 const unsigned char *lparam, unsigned long lparamlen, 37 const unsigned char *lparam, unsigned long lparamlen,
37 prng_state *prng, int prng_idx, int hash_idx, rsa_key *key) 38 prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key)
38 { 39 {
39 unsigned long modulus_bitlen, modulus_bytelen, x; 40 unsigned long modulus_bitlen, modulus_bytelen, x;
40 int err; 41 int err;
41 42
42 LTC_ARGCHK(in != NULL); 43 LTC_ARGCHK(in != NULL);
43 LTC_ARGCHK(out != NULL); 44 LTC_ARGCHK(out != NULL);
44 LTC_ARGCHK(outlen != NULL); 45 LTC_ARGCHK(outlen != NULL);
45 LTC_ARGCHK(key != NULL); 46 LTC_ARGCHK(key != NULL);
46 47
47 /* valid prng and hash ? */ 48 /* valid padding? */
49 if ((padding != LTC_PKCS_1_V1_5) &&
50 (padding != LTC_PKCS_1_OAEP)) {
51 return CRYPT_PK_INVALID_PADDING;
52 }
53
54 /* valid prng? */
48 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { 55 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
49 return err; 56 return err;
50 } 57 }
51 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { 58
52 return err; 59 if (padding == LTC_PKCS_1_OAEP) {
60 /* valid hash? */
61 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
62 return err;
63 }
53 } 64 }
54 65
55 /* get modulus len in bits */ 66 /* get modulus len in bits */
56 modulus_bitlen = mp_count_bits(&(key->N)); 67 modulus_bitlen = mp_count_bits( (key->N));
57 68
58 /* outlen must be at least the size of the modulus */ 69 /* outlen must be at least the size of the modulus */
59 modulus_bytelen = mp_unsigned_bin_size(&(key->N)); 70 modulus_bytelen = mp_unsigned_bin_size( (key->N));
60 if (modulus_bytelen > *outlen) { 71 if (modulus_bytelen > *outlen) {
72 *outlen = modulus_bytelen;
61 return CRYPT_BUFFER_OVERFLOW; 73 return CRYPT_BUFFER_OVERFLOW;
62 } 74 }
63
64 /* OAEP pad the key */
65 x = *outlen;
66 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
67 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
68 out, &x)) != CRYPT_OK) {
69 return err;
70 }
71 75
72 /* rsa exptmod the OAEP pad */ 76 if (padding == LTC_PKCS_1_OAEP) {
73 return rsa_exptmod(out, x, out, outlen, PK_PUBLIC, key); 77 /* OAEP pad the key */
78 x = *outlen;
79 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
80 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
81 out, &x)) != CRYPT_OK) {
82 return err;
83 }
84 } else {
85 /* PKCS #1 v1.5 pad the key */
86 x = *outlen;
87 if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME,
88 modulus_bitlen, prng, prng_idx,
89 out, &x)) != CRYPT_OK) {
90 return err;
91 }
92 }
93
94 /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */
95 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key);
74 } 96 }
75 97
76 #endif /* MRSA */ 98 #endif /* MRSA */
77 99
78 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */ 100 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */
79 /* $Revision: 1.3 $ */ 101 /* $Revision: 1.8 $ */
80 /* $Date: 2005/05/05 14:35:59 $ */ 102 /* $Date: 2006/11/01 09:18:22 $ */