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annotate libtomcrypt/src/pk/dh/dh_export.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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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: $Format:%ai$ */