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annotate libtomcrypt/src/pk/dh/dh_export.c @ 1607:0bdbb9ecc403

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avoid leak of ecdh public key
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Mar 2018 23:51:33 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 /**
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15 Export a DH key to a binary packet
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16 @param out [out] The destination for the key
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17 @param outlen [in/out] The max size and resulting size of the DH key
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18 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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19 @param key The key you wish to export
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20 @return CRYPT_OK if successful
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21 */
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22 int dh_export(unsigned char *out, unsigned long *outlen, int type, dh_key *key)
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23 {
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24 unsigned char flags[1];
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25 int err;
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26 unsigned long version = 0;
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27
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28 LTC_ARGCHK(out != NULL);
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29 LTC_ARGCHK(outlen != NULL);
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30 LTC_ARGCHK(key != NULL);
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31
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32 if (type == PK_PRIVATE) {
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33 /* export x - private key */
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34 flags[0] = 1;
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35 err = der_encode_sequence_multi(out, outlen,
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36 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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37 LTC_ASN1_BIT_STRING, 1UL, flags,
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38 LTC_ASN1_INTEGER, 1UL, key->prime,
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39 LTC_ASN1_INTEGER, 1UL, key->base,
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40 LTC_ASN1_INTEGER, 1UL, key->x,
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41 LTC_ASN1_EOL, 0UL, NULL);
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42 }
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43 else {
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44 /* export y - public key */
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45 flags[0] = 0;
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46 err = der_encode_sequence_multi(out, outlen,
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47 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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48 LTC_ASN1_BIT_STRING, 1UL, flags,
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49 LTC_ASN1_INTEGER, 1UL, key->prime,
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50 LTC_ASN1_INTEGER, 1UL, key->base,
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51 LTC_ASN1_INTEGER, 1UL, key->y,
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52 LTC_ASN1_EOL, 0UL, NULL);
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53 }
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54
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55 return err;
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56 }
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57
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58 #endif /* LTC_MDH */
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59
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60 /* ref: $Format:%D$ */
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61 /* git commit: $Format:%H$ */
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62 /* commit time: $Format:%ai$ */