Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_encrypt_key.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
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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diff changeset
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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diff changeset
11 #include "tomcrypt.h"
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12
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13 /**
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14 @file katja_encrypt_key.c
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15 Katja PKCS-style OAEP encryption, 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) 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 key The Katja key to encrypt to
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32 @return CRYPT_OK if successful
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33 */
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34 int katja_encrypt_key(const unsigned char *in, unsigned long inlen,
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35 unsigned char *out, unsigned long *outlen,
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36 const unsigned char *lparam, unsigned long lparamlen,
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37 prng_state *prng, int prng_idx, int hash_idx, 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
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42 LTC_ARGCHK(in != NULL);
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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
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47 /* valid prng and hash ? */
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48 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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49 return err;
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50 }
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51 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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52 return err;
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53 }
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54
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55 /* get modulus len in bits */
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56 modulus_bitlen = mp_count_bits((key->N));
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57
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58 /* 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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59 modulus_bitlen = ((modulus_bitlen << 1) / 3);
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60
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61 /* round down to next byte */
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62 modulus_bitlen -= (modulus_bitlen & 7) + 8;
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63
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64 /* outlen must be at least the size of the modulus */
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65 modulus_bytelen = mp_unsigned_bin_size((key->N));
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66 if (modulus_bytelen > *outlen) {
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67 *outlen = modulus_bytelen;
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68 return CRYPT_BUFFER_OVERFLOW;
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69 }
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70
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71 /* OAEP pad the key */
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72 x = *outlen;
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73 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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74 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
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75 out, &x)) != CRYPT_OK) {
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76 return err;
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77 }
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78
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79 /* Katja exptmod the OAEP pad */
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80 return katja_exptmod(out, x, out, outlen, PK_PUBLIC, key);
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81 }
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82
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diff changeset
83 #endif /* MRSA */
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84
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diff changeset
85 /* $Source: /cvs/libtom/libtomcrypt/src/pk/katja/katja_encrypt_key.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 /* $Date: 2006/06/16 21:53:41 $ */