+int tr_dh_pub_hash(TID_REQ *request,
+ unsigned char **out_digest,
+ size_t *out_len)
+{
+ const BIGNUM *pub = request->tidc_dh->pub_key;
+ unsigned char *bn_bytes = talloc_zero_size(request, BN_num_bytes(pub));
+ unsigned char *digest = talloc_zero_size(request, SHA_DIGEST_LENGTH+1);
+ assert(bn_bytes && digest);
+ BN_bn2bin(pub, bn_bytes);
+ SHA1(bn_bytes, BN_num_bytes(pub), digest);
+ *out_digest = digest;
+ *out_len = SHA_DIGEST_LENGTH;
+
+ talloc_free(bn_bytes);
+ return 0;
+}
+
+void tr_dh_free(unsigned char *dh_buf)
+{
+ free(dh_buf);
+}
+
+void tr_dh_destroy(DH *dh)
+{
+ DH_free(dh);
+}