Mercurial > dropbear

annotate libtomcrypt/src/pk/dh/dh_sys.c @ 321:fa9c45d09727

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change AC_MSG_RESULT to AC_MSG_NOTICE in configure.in, add AC_SYS_LARGEFILE
author Matt Johnston <matt@ucc.asn.au>
date Wed, 07 Jun 2006 13:37:03 +0000
parents 1b9e69c058d2
children
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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.org
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10 */
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11
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12 /**
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13 @file dh_sys.c
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14 DH Crypto, Tom St Denis
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15 */
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16
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17 /**
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18 Encrypt a short symmetric key with a public DH key
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19 @param in The symmetric key to encrypt
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20 @param inlen The length of the key (octets)
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21 @param out [out] The ciphertext
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22 @param outlen [in/out] The max size and resulting size of the ciphertext
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23 @param prng An active PRNG state
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24 @param wprng The index of the PRNG desired
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25 @param hash The index of the hash desired (must produce a digest of size >= the size of the plaintext)
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26 @param key The public key you wish to encrypt with.
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27 @return CRYPT_OK if successful
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28 */
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29 int dh_encrypt_key(const unsigned char *in, unsigned long inlen,
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30 unsigned char *out, unsigned long *outlen,
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31 prng_state *prng, int wprng, int hash,
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32 dh_key *key)
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33 {
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34 unsigned char *pub_expt, *dh_shared, *skey;
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35 dh_key pubkey;
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36 unsigned long x, y, z, hashsize, pubkeysize;
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37 int err;
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38
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39 LTC_ARGCHK(in != NULL);
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40 LTC_ARGCHK(out != NULL);
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41 LTC_ARGCHK(outlen != NULL);
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42 LTC_ARGCHK(key != NULL);
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43
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44 /* check that wprng/hash are not invalid */
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45 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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50 return err;
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51 }
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52
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53 if (inlen > hash_descriptor[hash].hashsize) {
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54 return CRYPT_INVALID_HASH;
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55 }
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56
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57 /* allocate memory */
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58 pub_expt = XMALLOC(DH_BUF_SIZE);
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59 dh_shared = XMALLOC(DH_BUF_SIZE);
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60 skey = XMALLOC(MAXBLOCKSIZE);
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61 if (pub_expt == NULL || dh_shared == NULL || skey == NULL) {
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62 if (pub_expt != NULL) {
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63 XFREE(pub_expt);
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64 }
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65 if (dh_shared != NULL) {
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66 XFREE(dh_shared);
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67 }
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68 if (skey != NULL) {
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69 XFREE(skey);
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70 }
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71 return CRYPT_MEM;
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72 }
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73
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