Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_decrypt_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
382
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diff changeset
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 katja_decrypt_key.c
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15 Katja PKCS #1 OAEP Decryption, Tom St Denis
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16 */
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17
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18 #ifdef MKAT
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19
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20 /**
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21 (PKCS #1 v2.0) decrypt then OAEP depad
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22 @param in The ciphertext
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23 @param inlen The length of the ciphertext (octets)
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24 @param out [out] The plaintext
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25 @param outlen [in/out] The max size and resulting size of the plaintext (octets)
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26 @param lparam The system "lparam" value
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27 @param lparamlen The length of the lparam value (octets)
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28 @param hash_idx The index of the hash desired
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29 @param stat [out] Result of the decryption, 1==valid, 0==invalid
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30 @param key The corresponding private Katja key
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31 @return CRYPT_OK if succcessul (even if invalid)
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32 */
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33 int katja_decrypt_key(const unsigned char *in, unsigned long inlen,
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34 unsigned char *out, unsigned long *outlen,
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35 const unsigned char *lparam, unsigned long lparamlen,
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36 int hash_idx, int *stat,
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37 katja_key *key)
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38 {
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39 unsigned long modulus_bitlen, modulus_bytelen, x;
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40 int err;
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41 unsigned char *tmp;
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42
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43 LTC_ARGCHK(out != NULL);
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44 LTC_ARGCHK(outlen != NULL);
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45 LTC_ARGCHK(key != NULL);
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46 LTC_ARGCHK(stat != NULL);
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47
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48 /* default to invalid */
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49 *stat = 0;
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50
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51 /* valid hash ? */
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52 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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53 return err;
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54 }
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55
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56 /* get modulus len in bits */
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57 modulus_bitlen = mp_count_bits( (key->N));
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58
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59 /* payload is upto pq, so we know q is 1/3rd the size of N and therefore pq is 2/3th the size */
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60 modulus_bitlen = ((modulus_bitlen << 1) / 3);
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61
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62 /* round down to next byte */
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63 modulus_bitlen -= (modulus_bitlen & 7) + 8;
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64
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65 /* outlen must be at least the size of the modulus */
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66 modulus_bytelen = mp_unsigned_bin_size( (key->N));
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67 if (modulus_bytelen != inlen) {
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68 return CRYPT_INVALID_PACKET;
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69 }
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70
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71 /* allocate ram */
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72 tmp = XMALLOC(inlen);
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73 if (tmp == NULL) {
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74 return CRYPT_MEM;
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75 }
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76
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77 /* rsa decode the packet */
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78 x = inlen;
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79 if ((err = katja_exptmod(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) {
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80 XFREE(tmp);
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81 return err;
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82 }
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83
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84 /* shift right by modulus_bytelen - modulus_bitlen/8 bytes */
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parents:
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85 for (x = 0; x < (modulus_bitlen >> 3); x++) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 tmp[x] = tmp[x+(modulus_bytelen-(modulus_bitlen>>3))];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 /* now OAEP decode the packet */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx,
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 out, outlen, stat);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 XFREE(tmp);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 return err;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif /* MRSA */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 /* $Source: /cvs/libtom/libtomcrypt/src/pk/katja/katja_decrypt_key.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 /* $Revision: 1.4 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 /* $Date: 2006/03/31 14:15:35 $ */