116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
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/*
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This file is part of TALER
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Copyright (C) 2021 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file denom.c
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* @brief denomination utility functions
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include "taler_util.h"
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void
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TALER_denom_pub_hash (const struct TALER_DenominationPublicKey *denom_pub,
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struct TALER_DenominationHash *denom_hash)
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{
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uint32_t opt[2] = {
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htonl (denom_pub->age_mask),
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htonl ((uint32_t) denom_pub->cipher)
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};
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struct GNUNET_HashContext *hc;
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hc = GNUNET_CRYPTO_hash_context_start ();
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GNUNET_CRYPTO_hash_context_read (hc,
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opt,
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sizeof (opt));
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switch (denom_pub->cipher)
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{
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case TALER_DENOMINATION_RSA:
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{
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void *buf;
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size_t blen;
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blen = GNUNET_CRYPTO_rsa_public_key_encode (
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denom_pub->details.rsa_public_key,
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&buf);
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GNUNET_CRYPTO_hash_context_read (hc,
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buf,
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blen);
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GNUNET_free (buf);
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}
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break;
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// TODO: add case for Clause-Schnorr
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default:
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GNUNET_assert (0);
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}
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GNUNET_CRYPTO_hash_context_finish (hc,
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&denom_hash->hash);
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}
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void
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TALER_denom_priv_to_pub (const struct TALER_DenominationPrivateKey *denom_priv,
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uint32_t age_mask,
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struct TALER_DenominationPublicKey *denom_pub)
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{
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switch (denom_priv->cipher)
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{
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case TALER_DENOMINATION_RSA:
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denom_pub->cipher = TALER_DENOMINATION_RSA;
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denom_pub->age_mask = age_mask;
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denom_pub->details.rsa_public_key
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= GNUNET_CRYPTO_rsa_private_key_get_public (
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denom_priv->details.rsa_private_key);
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return;
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// TODO: add case for Clause-Schnorr
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default:
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GNUNET_assert (0);
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}
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}
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enum GNUNET_GenericReturnValue
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TALER_denom_pub_verify (const struct TALER_DenominationPublicKey *denom_pub,
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const struct TALER_DenominationSignature *denom_sig,
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const struct TALER_CoinPubHash *c_hash)
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{
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if (denom_pub->cipher != denom_sig->cipher)
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{
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GNUNET_break (0);
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return GNUNET_SYSERR;
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}
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switch (denom_pub->cipher)
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{
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case TALER_DENOMINATION_RSA:
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if (GNUNET_OK !=
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GNUNET_CRYPTO_rsa_verify (&c_hash->hash,
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denom_sig->details.rsa_signature,
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denom_pub->details.rsa_public_key))
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{
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GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
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"Coin signature is invalid\n");
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return GNUNET_NO;
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}
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return GNUNET_YES;
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// TODO: add case for Clause-Schnorr
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default:
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GNUNET_assert (0);
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}
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}
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/* end of denom.c */
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