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comparison src/pk/rsa/rsa_encrypt_key.c @ 381:999a5eb4ed10 libtomcrypt-dropbear

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propagate from branch 'au.asn.ucc.matt.ltc.orig' (head 52840647ac7f5c707c3bd158d119a15734a7ef28) to branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:39:21 +0000
parents d5faf4814ddb
children
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281:997e6f7dc01e 381:999a5eb4ed10
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 $ */