Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_encrypt_key.c @ 919:fad4407e1552 coverity

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 08 Mar 2014 16:56:15 +0800
parents ac2158e3e403
children f849a5ca2efc
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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
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12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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13 *
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14 * All curves taken from NIST recommendation paper of July 1999
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15 * Available at http://csrc.nist.gov/cryptval/dss.htm
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16 */
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17 #include "tomcrypt.h"
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18
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19 /**
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20 @file ecc_encrypt_key.c
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21 ECC Crypto, Tom St Denis
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22 */
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23
761
ac2158e3e403 ecc kind of works, needs fixing/testing
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24 #if defined(MECC) && defined(LTC_DER)
382
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25
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26 /**
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27 Encrypt a symmetric key with ECC
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28 @param in The symmetric key you want to encrypt
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29 @param inlen The length of the key to encrypt (octets)
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30 @param out [out] The destination for the ciphertext
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31 @param outlen [in/out] The max size and resulting size of the ciphertext
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32 @param prng An active PRNG state
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33 @param wprng The index of the PRNG you wish to use
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34 @param hash The index of the hash you want to use
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35 @param key The ECC key you want to encrypt to
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36 @return CRYPT_OK if successful
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37 */
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38 int ecc_encrypt_key(const unsigned char *in, unsigned long inlen,
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39 unsigned char *out, unsigned long *outlen,
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40 prng_state *prng, int wprng, int hash,
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41 ecc_key *key)
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42 {
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43 unsigned char *pub_expt, *ecc_shared, *skey;
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44 ecc_key pubkey;
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45 unsigned long x, y, pubkeysize;
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46 int err;
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47
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48 LTC_ARGCHK(in != NULL);
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49 LTC_ARGCHK(out != NULL);
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50 LTC_ARGCHK(outlen != NULL);
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51 LTC_ARGCHK(key != NULL);
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52
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53 /* check that wprng/cipher/hash are not invalid */
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54 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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55 return err;
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56 }
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57
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58 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 if (inlen > hash_descriptor[hash].hashsize) {
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63 return CRYPT_INVALID_HASH;
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64 }
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65
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66 /* make a random key and export the public copy */
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67 if ((err = ecc_make_key_ex(prng, wprng, &pubkey, key->dp)) != CRYPT_OK) {
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68 return err;
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69 }
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70
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71 pub_expt = XMALLOC(ECC_BUF_SIZE);
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72 ecc_shared = XMALLOC(ECC_BUF_SIZE);