Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_encrypt_key.c @ 878:3d1d7d151c0c DROPBEAR_2013.62

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2013.62
author Matt Johnston <matt@ucc.asn.au>
date Tue, 03 Dec 2013 21:39:06 +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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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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Matt Johnston <matt@ucc.asn.au>
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73 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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Matt Johnston <matt@ucc.asn.au>
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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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Matt Johnston <matt@ucc.asn.au>
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76 return err;
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77 }
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78
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Matt Johnston <matt@ucc.asn.au>
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79 /* Katja exptmod the OAEP pad */
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Matt Johnston <matt@ucc.asn.au>
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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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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 $ */