mirror of
https://github.com/clearml/dropbear
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63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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#ifdef LTC_MDH
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/**
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Export a DH key to a binary packet
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@param out [out] The destination for the key
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@param outlen [in/out] The max size and resulting size of the DH key
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@param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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@param key The key you wish to export
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@return CRYPT_OK if successful
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*/
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int dh_export(unsigned char *out, unsigned long *outlen, int type, dh_key *key)
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{
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unsigned char flags[1];
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int err;
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unsigned long version = 0;
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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if (type == PK_PRIVATE) {
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/* export x - private key */
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flags[0] = 1;
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err = der_encode_sequence_multi(out, outlen,
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LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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LTC_ASN1_BIT_STRING, 1UL, flags,
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LTC_ASN1_INTEGER, 1UL, key->prime,
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LTC_ASN1_INTEGER, 1UL, key->base,
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LTC_ASN1_INTEGER, 1UL, key->x,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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else {
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/* export y - public key */
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flags[0] = 0;
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err = der_encode_sequence_multi(out, outlen,
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LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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LTC_ASN1_BIT_STRING, 1UL, flags,
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LTC_ASN1_INTEGER, 1UL, key->prime,
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LTC_ASN1_INTEGER, 1UL, key->base,
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LTC_ASN1_INTEGER, 1UL, key->y,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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return err;
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}
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#endif /* LTC_MDH */
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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