Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_decrypt_key.c @ 662:d354464b2aa6 DROPBEAR_2012.55

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- Improve CHANGES description
author Matt Johnston <matt@ucc.asn.au>
date Thu, 23 Feb 2012 21:45:36 +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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Matt Johnston <matt@ucc.asn.au>
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74 return CRYPT_MEM;
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75 }
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76
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Matt Johnston <matt@ucc.asn.au>
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77 /* rsa decode the packet */
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Matt Johnston <matt@ucc.asn.au>
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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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Matt Johnston <matt@ucc.asn.au>
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80 XFREE(tmp);
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Matt Johnston <matt@ucc.asn.au>
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81 return err;
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82 }
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83
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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84 /* shift right by modulus_bytelen - modulus_bitlen/8 bytes */
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Matt Johnston <matt@ucc.asn.au>
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85 for (x = 0; x < (modulus_bitlen >> 3); x++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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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 $ */