673 lines
20 KiB
C
673 lines
20 KiB
C
/*
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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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enum GNUNET_GenericReturnValue
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TALER_denom_priv_create (struct TALER_DenominationPrivateKey *denom_priv,
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struct TALER_DenominationPublicKey *denom_pub,
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enum TALER_DenominationCipher cipher,
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...)
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{
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memset (denom_priv,
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0,
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sizeof (*denom_priv));
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memset (denom_pub,
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0,
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sizeof (*denom_pub));
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denom_priv->cipher = cipher;
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denom_pub->cipher = cipher;
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switch (cipher)
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{
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case TALER_DENOMINATION_INVALID:
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GNUNET_break (0);
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return GNUNET_SYSERR;
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case TALER_DENOMINATION_RSA:
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{
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va_list ap;
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unsigned int bits;
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va_start (ap, cipher);
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bits = va_arg (ap, unsigned int);
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va_end (ap);
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if (bits < 512)
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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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denom_priv->details.rsa_private_key
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= GNUNET_CRYPTO_rsa_private_key_create (bits);
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}
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if (NULL == denom_priv->details.rsa_private_key)
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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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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 GNUNET_OK;
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case TALER_DENOMINATION_CS:
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GNUNET_CRYPTO_cs_private_key_generate (&denom_priv->details.cs_private_key);
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GNUNET_CRYPTO_cs_private_key_get_public (
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&denom_priv->details.cs_private_key,
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&denom_pub->details.cs_public_key);
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return GNUNET_OK;
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default:
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GNUNET_break (0);
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}
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return GNUNET_SYSERR;
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}
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enum GNUNET_GenericReturnValue
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TALER_denom_cs_derive_r_secret (const struct TALER_WithdrawNonce *nonce,
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const struct
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TALER_DenominationPrivateKey *denom_priv,
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struct TALER_DenominationCsPrivateR *r)
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{
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if (denom_priv->cipher != TALER_DENOMINATION_CS)
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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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GNUNET_CRYPTO_cs_r_derive (&nonce->nonce,
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&denom_priv->details.cs_private_key,
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r->r);
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return GNUNET_OK;
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}
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enum GNUNET_GenericReturnValue
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TALER_denom_cs_derive_r_public (const struct TALER_WithdrawNonce *nonce,
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const struct
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TALER_DenominationPrivateKey *denom_priv,
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struct TALER_DenominationCsPublicR *r_pub)
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{
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if (denom_priv->cipher != TALER_DENOMINATION_CS)
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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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struct GNUNET_CRYPTO_CsRSecret r[2];
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GNUNET_CRYPTO_cs_r_derive (&nonce->nonce,
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&denom_priv->details.cs_private_key,
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r);
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GNUNET_CRYPTO_cs_r_get_public (&r[0], &r_pub->r_pub[0]);
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GNUNET_CRYPTO_cs_r_get_public (&r[1], &r_pub->r_pub[1]);
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return GNUNET_OK;
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}
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enum GNUNET_GenericReturnValue
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TALER_denom_sign_blinded (struct TALER_BlindedDenominationSignature *denom_sig,
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const struct TALER_DenominationPrivateKey *denom_priv,
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const struct TALER_BlindedPlanchet *blinded_planchet,
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...)
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{
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memset (denom_sig,
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0,
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sizeof (*denom_sig));
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switch (denom_priv->cipher)
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{
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case TALER_DENOMINATION_INVALID:
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GNUNET_break (0);
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return GNUNET_SYSERR;
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case TALER_DENOMINATION_RSA:
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denom_sig->details.blinded_rsa_signature
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= GNUNET_CRYPTO_rsa_sign_blinded (
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denom_priv->details.rsa_private_key,
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blinded_planchet->details.rsa_blinded_planchet.blinded_msg,
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blinded_planchet->details.rsa_blinded_planchet.blinded_msg_size);
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if (NULL == denom_sig->details.blinded_rsa_signature)
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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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denom_sig->cipher = TALER_DENOMINATION_RSA;
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return GNUNET_OK;
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case TALER_DENOMINATION_CS:
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{
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va_list ap;
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va_start (ap, blinded_planchet);
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struct TALER_WithdrawNonce *nonce;
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nonce = va_arg (ap, struct TALER_WithdrawNonce *);
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struct GNUNET_CRYPTO_CsRSecret r[2];
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GNUNET_CRYPTO_cs_r_derive (&nonce->nonce,
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&denom_priv->details.cs_private_key,
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r);
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denom_sig->details.blinded_cs_answer.b =
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GNUNET_CRYPTO_cs_sign_derive (&denom_priv->details.cs_private_key,
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r,
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blinded_planchet->details.
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cs_blinded_planchet.c,
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&nonce->nonce,
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&denom_sig->details.blinded_cs_answer.
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s_scalar);
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denom_sig->cipher = TALER_DENOMINATION_CS;
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va_end (ap);
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}
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return GNUNET_OK;
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default:
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GNUNET_break (0);
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}
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return GNUNET_SYSERR;
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}
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enum GNUNET_GenericReturnValue
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TALER_denom_sig_unblind (
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struct TALER_DenominationSignature *denom_sig,
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const struct TALER_BlindedDenominationSignature *bdenom_sig,
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const union TALER_DenominationBlindingKeyP *bks,
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const struct TALER_DenominationPublicKey *denom_pub,
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...)
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{
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if (bdenom_sig->cipher != denom_pub->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_INVALID:
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GNUNET_break (0);
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return GNUNET_SYSERR;
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case TALER_DENOMINATION_RSA:
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denom_sig->details.rsa_signature
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= GNUNET_CRYPTO_rsa_unblind (
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bdenom_sig->details.blinded_rsa_signature,
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&bks->rsa_bks,
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denom_pub->details.rsa_public_key);
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if (NULL == denom_sig->details.rsa_signature)
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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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denom_sig->cipher = TALER_DENOMINATION_RSA;
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return GNUNET_OK;
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case TALER_DENOMINATION_CS:
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{
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va_list ap;
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va_start (ap, denom_pub);
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struct TALER_DenominationCsPublicR *r_pub_dash;
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r_pub_dash = va_arg (ap, struct TALER_DenominationCsPublicR *);
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struct GNUNET_CRYPTO_CsBlindingSecret bs[2];
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GNUNET_CRYPTO_cs_blinding_secrets_derive (&bks->nonce, bs);
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struct GNUNET_CRYPTO_CsS s_scalar;
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GNUNET_CRYPTO_cs_unblind (&bdenom_sig->details.blinded_cs_answer.s_scalar,
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&bs[bdenom_sig->details.blinded_cs_answer.b],
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&s_scalar);
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// TODO: This seems to work, but is this a good idea?
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// Not working:
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// denom_sig->details.cs_signature.r_point = r_pub_dash->r_pub[bdenom_sig->details.blinded_cs_answer.b];
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GNUNET_memcpy (&denom_sig->details.cs_signature, &s_scalar, sizeof(struct
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GNUNET_CRYPTO_CsS));
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GNUNET_memcpy (&denom_sig->details.cs_signature + sizeof(struct
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GNUNET_CRYPTO_CsS),
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&r_pub_dash->r_pub[bdenom_sig->details.blinded_cs_answer.b],
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sizeof(struct GNUNET_CRYPTO_CsRPublic));
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denom_sig->cipher = TALER_DENOMINATION_CS;
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va_end (ap);
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return GNUNET_OK;
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}
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default:
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GNUNET_break (0);
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}
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return GNUNET_SYSERR;
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}
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/**
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* Hash @a rsa.
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*
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* @param rsa key to hash
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* @param[out] h_rsa where to write the result
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*/
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void
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TALER_rsa_pub_hash (const struct GNUNET_CRYPTO_RsaPublicKey *rsa,
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struct TALER_RsaPubHashP *h_rsa)
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{
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GNUNET_CRYPTO_rsa_public_key_hash (rsa,
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&h_rsa->hash);
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}
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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.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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case TALER_DENOMINATION_CS:
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GNUNET_CRYPTO_hash_context_read (hc,
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&denom_pub->details.cs_public_key,
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sizeof(denom_pub->details.cs_public_key));
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break;
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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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const struct TALER_AgeMask 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_blind (const struct TALER_DenominationPublicKey *dk,
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const union TALER_DenominationBlindingKeyP *coin_bks,
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const struct TALER_AgeHash *age_commitment_hash,
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const struct TALER_CoinSpendPublicKeyP *coin_pub,
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struct TALER_CoinPubHash *c_hash,
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struct TALER_BlindedPlanchet *blinded_planchet,
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...)
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{
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blinded_planchet->cipher = dk->cipher;
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TALER_coin_pub_hash (coin_pub,
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age_commitment_hash,
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c_hash);
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switch (dk->cipher)
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{
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case TALER_DENOMINATION_RSA:
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if (GNUNET_YES !=
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GNUNET_CRYPTO_rsa_blind (&c_hash->hash,
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&coin_bks->rsa_bks,
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dk->details.rsa_public_key,
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&blinded_planchet->details.rsa_blinded_planchet
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.blinded_msg,
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&blinded_planchet->details.rsa_blinded_planchet
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.blinded_msg_size))
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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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return GNUNET_OK;
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case TALER_DENOMINATION_CS:
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{
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va_list ap;
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va_start (ap, blinded_planchet);
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struct TALER_WithdrawNonce *nonce;
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struct TALER_DenominationCsPublicR *r_pub;
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struct TALER_DenominationCsPublicR *blinded_r_pub;
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nonce = va_arg (ap, struct TALER_WithdrawNonce *);
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r_pub = va_arg (ap, struct TALER_DenominationCsPublicR *);
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blinded_r_pub = va_arg (ap, struct TALER_DenominationCsPublicR *);
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struct GNUNET_CRYPTO_CsBlindingSecret bs[2];
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GNUNET_CRYPTO_cs_blinding_secrets_derive (&nonce->nonce, bs);
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GNUNET_CRYPTO_cs_calc_blinded_c (bs,
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r_pub->r_pub,
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&dk->details.cs_public_key,
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&c_hash->hash,
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sizeof(struct GNUNET_HashCode),
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blinded_planchet->details.
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cs_blinded_planchet.c,
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blinded_r_pub->r_pub);
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va_end (ap);
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return GNUNET_OK;
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}
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default:
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GNUNET_break (0);
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return GNUNET_SYSERR;
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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_INVALID:
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GNUNET_break (0);
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return GNUNET_NO;
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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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case TALER_DENOMINATION_CS:
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if (GNUNET_OK !=
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GNUNET_CRYPTO_cs_verify (&denom_sig->details.cs_signature,
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&denom_pub->details.cs_public_key,
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c_hash,
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sizeof(*c_hash)))
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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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default:
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GNUNET_assert (0);
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}
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}
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void
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TALER_denom_pub_free (struct TALER_DenominationPublicKey *denom_pub)
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{
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switch (denom_pub->cipher)
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{
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case TALER_DENOMINATION_INVALID:
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return;
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case TALER_DENOMINATION_RSA:
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if (NULL != denom_pub->details.rsa_public_key)
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{
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GNUNET_CRYPTO_rsa_public_key_free (denom_pub->details.rsa_public_key);
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denom_pub->details.rsa_public_key = NULL;
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}
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denom_pub->cipher = TALER_DENOMINATION_INVALID;
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return;
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case TALER_DENOMINATION_CS:
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// TODO: ATM nothing needs to be freed, but check again after implementation.
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return;
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default:
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GNUNET_assert (0);
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}
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}
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void
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TALER_denom_priv_free (struct TALER_DenominationPrivateKey *denom_priv)
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{
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switch (denom_priv->cipher)
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{
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case TALER_DENOMINATION_INVALID:
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return;
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case TALER_DENOMINATION_RSA:
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if (NULL != denom_priv->details.rsa_private_key)
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{
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GNUNET_CRYPTO_rsa_private_key_free (denom_priv->details.rsa_private_key);
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denom_priv->details.rsa_private_key = NULL;
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}
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denom_priv->cipher = TALER_DENOMINATION_INVALID;
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return;
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case TALER_DENOMINATION_CS:
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// TODO: ATM nothing needs to be freed, but check again after implementation.
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return;
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default:
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GNUNET_assert (0);
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}
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}
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void
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TALER_denom_sig_free (struct TALER_DenominationSignature *denom_sig)
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{
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switch (denom_sig->cipher)
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{
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case TALER_DENOMINATION_INVALID:
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return;
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case TALER_DENOMINATION_RSA:
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|
if (NULL != denom_sig->details.rsa_signature)
|
|
{
|
|
GNUNET_CRYPTO_rsa_signature_free (denom_sig->details.rsa_signature);
|
|
denom_sig->details.rsa_signature = NULL;
|
|
}
|
|
denom_sig->cipher = TALER_DENOMINATION_INVALID;
|
|
return;
|
|
case TALER_DENOMINATION_CS:
|
|
// TODO: ATM nothing needs to be freed, but check again after implementation.
|
|
return;
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
TALER_blinded_denom_sig_free (
|
|
struct TALER_BlindedDenominationSignature *denom_sig)
|
|
{
|
|
switch (denom_sig->cipher)
|
|
{
|
|
case TALER_DENOMINATION_INVALID:
|
|
return;
|
|
case TALER_DENOMINATION_RSA:
|
|
if (NULL != denom_sig->details.blinded_rsa_signature)
|
|
{
|
|
GNUNET_CRYPTO_rsa_signature_free (
|
|
denom_sig->details.blinded_rsa_signature);
|
|
denom_sig->details.blinded_rsa_signature = NULL;
|
|
}
|
|
denom_sig->cipher = TALER_DENOMINATION_INVALID;
|
|
return;
|
|
case TALER_DENOMINATION_CS:
|
|
// TODO: ATM nothing needs to be freed, but check again after implementation.
|
|
return;
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Make a (deep) copy of the given @a denom_src to
|
|
* @a denom_dst.
|
|
*
|
|
* @param[out] denom_dst target to copy to
|
|
* @param denom_str public key to copy
|
|
*/
|
|
void
|
|
TALER_denom_pub_deep_copy (struct TALER_DenominationPublicKey *denom_dst,
|
|
const struct TALER_DenominationPublicKey *denom_src)
|
|
{
|
|
*denom_dst = *denom_src; /* shallow copy */
|
|
switch (denom_src->cipher)
|
|
{
|
|
case TALER_DENOMINATION_RSA:
|
|
denom_dst->details.rsa_public_key
|
|
= GNUNET_CRYPTO_rsa_public_key_dup (
|
|
denom_src->details.rsa_public_key);
|
|
return;
|
|
// TODO: add case for Clause-Schnorr
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
TALER_denom_sig_deep_copy (struct TALER_DenominationSignature *denom_dst,
|
|
const struct TALER_DenominationSignature *denom_src)
|
|
{
|
|
*denom_dst = *denom_src; /* shallow copy */
|
|
switch (denom_src->cipher)
|
|
{
|
|
case TALER_DENOMINATION_INVALID:
|
|
return;
|
|
case TALER_DENOMINATION_RSA:
|
|
denom_dst->details.rsa_signature
|
|
= GNUNET_CRYPTO_rsa_signature_dup (
|
|
denom_src->details.rsa_signature);
|
|
return;
|
|
// TODO: add case for Clause-Schnorr
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
TALER_blinded_denom_sig_deep_copy (
|
|
struct TALER_BlindedDenominationSignature *denom_dst,
|
|
const struct TALER_BlindedDenominationSignature *denom_src)
|
|
{
|
|
*denom_dst = *denom_src; /* shallow copy */
|
|
switch (denom_src->cipher)
|
|
{
|
|
case TALER_DENOMINATION_INVALID:
|
|
return;
|
|
case TALER_DENOMINATION_RSA:
|
|
denom_dst->details.blinded_rsa_signature
|
|
= GNUNET_CRYPTO_rsa_signature_dup (
|
|
denom_src->details.blinded_rsa_signature);
|
|
return;
|
|
// TODO: add case for Clause-Schnorr
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
TALER_denom_pub_cmp (const struct TALER_DenominationPublicKey *denom1,
|
|
const struct TALER_DenominationPublicKey *denom2)
|
|
{
|
|
if (denom1->cipher != denom2->cipher)
|
|
return (denom1->cipher > denom2->cipher) ? 1 : -1;
|
|
if (denom1->age_mask.mask != denom2->age_mask.mask)
|
|
return (denom1->age_mask.mask > denom2->age_mask.mask) ? 1 : -1;
|
|
switch (denom1->cipher)
|
|
{
|
|
case TALER_DENOMINATION_INVALID:
|
|
return 0;
|
|
case TALER_DENOMINATION_RSA:
|
|
return GNUNET_CRYPTO_rsa_public_key_cmp (denom1->details.rsa_public_key,
|
|
denom2->details.rsa_public_key);
|
|
// TODO: add case for Clause-Schnorr
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
return -2;
|
|
}
|
|
|
|
|
|
int
|
|
TALER_denom_sig_cmp (const struct TALER_DenominationSignature *sig1,
|
|
const struct TALER_DenominationSignature *sig2)
|
|
{
|
|
if (sig1->cipher != sig2->cipher)
|
|
return (sig1->cipher > sig2->cipher) ? 1 : -1;
|
|
switch (sig1->cipher)
|
|
{
|
|
case TALER_DENOMINATION_INVALID:
|
|
return 0;
|
|
case TALER_DENOMINATION_RSA:
|
|
return GNUNET_CRYPTO_rsa_signature_cmp (sig1->details.rsa_signature,
|
|
sig2->details.rsa_signature);
|
|
// TODO: add case for Clause-Schnorr
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
return -2;
|
|
}
|
|
|
|
|
|
int
|
|
TALER_blinded_denom_sig_cmp (
|
|
const struct TALER_BlindedDenominationSignature *sig1,
|
|
const struct TALER_BlindedDenominationSignature *sig2)
|
|
{
|
|
if (sig1->cipher != sig2->cipher)
|
|
return (sig1->cipher > sig2->cipher) ? 1 : -1;
|
|
switch (sig1->cipher)
|
|
{
|
|
case TALER_DENOMINATION_INVALID:
|
|
return 0;
|
|
case TALER_DENOMINATION_RSA:
|
|
return GNUNET_CRYPTO_rsa_signature_cmp (sig1->details.blinded_rsa_signature,
|
|
sig2->details.blinded_rsa_signature);
|
|
// TODO: add case for Clause-Schnorr
|
|
default:
|
|
GNUNET_assert (0);
|
|
}
|
|
return -2;
|
|
}
|
|
|
|
|
|
/* end of denom.c */
|