Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_export.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file katja_export.c
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13 Export Katja PKCS-style keys, Tom St Denis
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14 */
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15
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16 #ifdef LTC_MKAT
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17
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18 /**
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19 This will export either an KatjaPublicKey or KatjaPrivateKey
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20 @param out [out] Destination of the packet
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21 @param outlen [in/out] The max size and resulting size of the packet
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22 @param type The type of exported key (PK_PRIVATE or PK_PUBLIC)
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23 @param key The Katja key to export
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24 @return CRYPT_OK if successful
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25 */
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26 int katja_export(unsigned char *out, unsigned long *outlen, int type, katja_key *key)
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27 {
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28 int err;
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29 unsigned long zero=0;
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30
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31 LTC_ARGCHK(out != NULL);
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32 LTC_ARGCHK(outlen != NULL);
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33 LTC_ARGCHK(key != NULL);
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34
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35 /* type valid? */
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36 if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
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37 return CRYPT_PK_INVALID_TYPE;
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38 }
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39
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40 if (type == PK_PRIVATE) {
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41 /* private key */
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42 /* output is
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43 Version, n, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p, pq
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44 */
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45 if ((err = der_encode_sequence_multi(out, outlen,
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46 LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
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47 LTC_ASN1_INTEGER, 1UL, key->N,
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48 LTC_ASN1_INTEGER, 1UL, key->d,
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49 LTC_ASN1_INTEGER, 1UL, key->p,
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50 LTC_ASN1_INTEGER, 1UL, key->q,
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51 LTC_ASN1_INTEGER, 1UL, key->dP,
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52 LTC_ASN1_INTEGER, 1UL, key->dQ,
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53 LTC_ASN1_INTEGER, 1UL, key->qP,
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54 LTC_ASN1_INTEGER, 1UL, key->pq,
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55 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 /* clear zero and return */
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60 return CRYPT_OK;
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61 } else {
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62 /* public key */
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63 return der_encode_sequence_multi(out, outlen,
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64 LTC_ASN1_INTEGER, 1UL, key->N,
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65 LTC_ASN1_EOL, 0UL, NULL);
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66 }
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67 }
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68
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69 #endif /* LTC_MRSA */
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70
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71 /* ref: $Format:%D$ */
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72 /* git commit: $Format:%H$ */
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73 /* commit time: $Format:%ai$ */