Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file rsa_encrypt_key.c
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15 RSA PKCS #1 encryption, Tom St Denis and Andreas Lange
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16 */
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17
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18 #ifdef MRSA
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19
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20 /**
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21 (PKCS #1 v2.0) OAEP pad then encrypt
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22 @param in The plaintext
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23 @param inlen The length of the plaintext (octets)
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24 @param out [out] The ciphertext
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25 @param outlen [in/out] The max size and resulting size of the ciphertext
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26 @param lparam The system "lparam" for the encryption
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27 @param lparamlen The length of lparam (octets)
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28 @param prng An active PRNG
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29 @param prng_idx The index of the desired prng
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30 @param hash_idx The index of the desired hash
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31 @param padding Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5)
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32 @param key The RSA key to encrypt to
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33 @return CRYPT_OK if successful
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34 */
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35 int rsa_encrypt_key_ex(const unsigned char *in, unsigned long inlen,
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36 unsigned char *out, unsigned long *outlen,
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37 const unsigned char *lparam, unsigned long lparamlen,
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38 prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key)
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39 {
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40 unsigned long modulus_bitlen, modulus_bytelen, x;
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41 int err;
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42
285
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43 LTC_ARGCHK(in != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46 LTC_ARGCHK(key != NULL);
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47
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48 /* valid padding? */
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49 if ((padding != LTC_PKCS_1_V1_5) &&
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50 (padding != LTC_PKCS_1_OAEP)) {
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51 return CRYPT_PK_INVALID_PADDING;
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52 }
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53
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54 /* valid prng? */
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55 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 if (padding == LTC_PKCS_1_OAEP) {
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60 /* valid hash? */
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61 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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62 return err;
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63 }
285
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64 }
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65
285
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66 /* get modulus len in bits */
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67 modulus_bitlen = mp_count_bits( (key->N));
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68
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69 /* outlen must be at least the size of the modulus */
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70 modulus_bytelen = mp_unsigned_bin_size( (key->N));
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71 if (modulus_bytelen > *outlen) {
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72 *outlen = modulus_bytelen;
285
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73 return CRYPT_BUFFER_OVERFLOW;
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74 }
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75
382
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76 if (padding == LTC_PKCS_1_OAEP) {
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77 /* OAEP pad the key */
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78 x = *outlen;
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79 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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80 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
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81 out, &x)) != CRYPT_OK) {
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82 return err;
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83 }
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84 } else {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
85 /* PKCS #1 v1.5 pad the key */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
86 x = *outlen;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
87 if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME,
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
88 modulus_bitlen, prng, prng_idx,
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
89 out, &x)) != CRYPT_OK) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
90 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
91 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
92 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
94 /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
95 return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 #endif /* MRSA */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
101 /* $Revision: 1.8 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
102 /* $Date: 2006/11/01 09:18:22 $ */