/*
This file is part of TALER
Copyright (C) 2014-2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see
*/
/**
* @file include/taler_crypto_lib.h
* @brief taler-specific crypto functions
* @author Sree Harsha Totakura
* @author Christian Grothoff
*/
#ifndef TALER_CRYPTO_LIB_H
#define TALER_CRYPTO_LIB_H
#include
#include "taler_util.h"
#include "taler_error_codes.h"
#include
/* ****************** Coin crypto primitives ************* */
GNUNET_NETWORK_STRUCT_BEGIN
/**
* @brief Type of public keys for Taler security modules (software or hardware).
* Note that there are usually at least two security modules (RSA and EdDSA),
* each with its own private key.
*/
struct TALER_SecurityModulePublicKeyP
{
/**
* Taler uses EdDSA for security modules.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of private keys for Taler security modules (software or hardware).
*/
struct TALER_SecurityModulePrivateKeyP
{
/**
* Taler uses EdDSA for security modules.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of signatures used for Taler security modules (software or hardware).
*/
struct TALER_SecurityModuleSignatureP
{
/**
* Taler uses EdDSA for security modules.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_signature;
};
/**
* @brief Type of public keys for Taler reserves.
*/
struct TALER_ReservePublicKeyP
{
/**
* Taler uses EdDSA for reserves.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of private keys for Taler reserves.
*/
struct TALER_ReservePrivateKeyP
{
/**
* Taler uses EdDSA for reserves.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of signatures used with Taler reserves.
*/
struct TALER_ReserveSignatureP
{
/**
* Taler uses EdDSA for reserves.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_signature;
};
/**
* @brief Type of public keys to for merchant authorizations.
* Merchants can issue refunds using the corresponding
* private key.
*/
struct TALER_MerchantPublicKeyP
{
/**
* Taler uses EdDSA for merchants.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of private keys for merchant authorizations.
* Merchants can issue refunds using the corresponding
* private key.
*/
struct TALER_MerchantPrivateKeyP
{
/**
* Taler uses EdDSA for merchants.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of signatures made by merchants.
*/
struct TALER_MerchantSignatureP
{
/**
* Taler uses EdDSA for merchants.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_sig;
};
/**
* @brief Type of transfer public keys used during refresh
* operations.
*/
struct TALER_TransferPublicKeyP
{
/**
* Taler uses ECDHE for transfer keys.
*/
struct GNUNET_CRYPTO_EcdhePublicKey ecdhe_pub;
};
/**
* @brief Type of transfer public keys used during refresh
* operations.
*/
struct TALER_TransferPrivateKeyP
{
/**
* Taler uses ECDHE for melting session keys.
*/
struct GNUNET_CRYPTO_EcdhePrivateKey ecdhe_priv;
};
/**
* @brief Type of online public keys used by the exchange to sign
* messages.
*/
struct TALER_ExchangePublicKeyP
{
/**
* Taler uses EdDSA for online exchange message signing.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of online public keys used by the exchange to
* sign messages.
*/
struct TALER_ExchangePrivateKeyP
{
/**
* Taler uses EdDSA for online signatures sessions.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of signatures used by the exchange to sign messages online.
*/
struct TALER_ExchangeSignatureP
{
/**
* Taler uses EdDSA for online signatures sessions.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_signature;
};
/**
* @brief Type of the offline master public key used by the exchange.
*/
struct TALER_MasterPublicKeyP
{
/**
* Taler uses EdDSA for the long-term offline master key.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of the private key used by the auditor.
*/
struct TALER_AuditorPrivateKeyP
{
/**
* Taler uses EdDSA for the auditor's signing key.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of the public key used by the auditor.
*/
struct TALER_AuditorPublicKeyP
{
/**
* Taler uses EdDSA for the auditor's signing key.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of signatures used by the auditor.
*/
struct TALER_AuditorSignatureP
{
/**
* Taler uses EdDSA signatures for auditors.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_sig;
};
/**
* @brief Type of the offline master public keys used by the exchange.
*/
struct TALER_MasterPrivateKeyP
{
/**
* Taler uses EdDSA for the long-term offline master key.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of signatures by the offline master public key used by the exchange.
*/
struct TALER_MasterSignatureP
{
/**
* Taler uses EdDSA for the long-term offline master key.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_signature;
};
/**
* @brief Type of public keys for Taler coins. The same key material is used
* for EdDSA and ECDHE operations.
*/
struct TALER_CoinSpendPublicKeyP
{
/**
* Taler uses EdDSA for coins when signing deposit requests.
*/
struct GNUNET_CRYPTO_EddsaPublicKey eddsa_pub;
};
/**
* @brief Type of private keys for Taler coins. The same key material is used
* for EdDSA and ECDHE operations.
*/
struct TALER_CoinSpendPrivateKeyP
{
/**
* Taler uses EdDSA for coins when signing deposit requests.
*/
struct GNUNET_CRYPTO_EddsaPrivateKey eddsa_priv;
};
/**
* @brief Type of signatures made with Taler coins.
*/
struct TALER_CoinSpendSignatureP
{
/**
* Taler uses EdDSA for coins.
*/
struct GNUNET_CRYPTO_EddsaSignature eddsa_signature;
};
/**
* @brief Type of blinding keys for Taler.
*/
struct TALER_DenominationBlindingKeyP
{
/**
* Taler uses RSA for blind signatures.
*/
struct GNUNET_CRYPTO_RsaBlindingKeySecret bks;
};
/**
* Commitment value for the refresh protocol.
* See #TALER_refresh_get_commitment().
*/
struct TALER_RefreshCommitmentP
{
/**
* The commitment is a hash code.
*/
struct GNUNET_HashCode session_hash;
};
/**
* Token used for access control to the merchant's unclaimed
* orders.
*/
struct TALER_ClaimTokenP
{
/**
* The token is a 128-bit UUID.
*/
struct GNUNET_Uuid token;
};
GNUNET_NETWORK_STRUCT_END
/**
* @brief Type of (unblinded) coin signatures for Taler.
*/
struct TALER_DenominationSignature
{
/**
* Taler uses RSA for blinding.
*/
struct GNUNET_CRYPTO_RsaSignature *rsa_signature;
};
/**
* @brief Type of public signing keys for verifying blindly signed coins.
*/
struct TALER_DenominationPublicKey
{
/**
* Taler uses RSA for signing coins.
*/
struct GNUNET_CRYPTO_RsaPublicKey *rsa_public_key;
};
/**
* @brief Type of private signing keys for blind signing of coins.
*/
struct TALER_DenominationPrivateKey
{
/**
* Taler uses RSA for signing coins.
*/
struct GNUNET_CRYPTO_RsaPrivateKey *rsa_private_key;
};
/**
* @brief Public information about a coin (including the public key
* of the coin, the denomination key and the signature with
* the denomination key).
*/
struct TALER_CoinPublicInfo
{
/**
* The coin's public key.
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* Hash of the public key representing the denomination of the coin that is
* being deposited.
*/
struct GNUNET_HashCode denom_pub_hash;
/**
* (Unblinded) signature over @e coin_pub with @e denom_pub,
* which demonstrates that the coin is valid.
*/
struct TALER_DenominationSignature denom_sig;
};
/**
* Details for one of the /deposit operations that the
* exchange combined into a single wire transfer.
*/
struct TALER_TrackTransferDetails
{
/**
* Hash of the proposal data.
*/
struct GNUNET_HashCode h_contract_terms;
/**
* Which coin was deposited?
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* Value of the deposit (including fee).
*/
struct TALER_Amount coin_value;
/**
* Fee charged by the exchange for the deposit.
*/
struct TALER_Amount coin_fee;
};
/**
* Check if a coin is valid; that is, whether the denomination key exists,
* is not expired, and the signature is correct.
*
* @param coin_public_info the coin public info to check for validity
* @param denom_pub denomination key, must match @a coin_public_info's `denom_pub_hash`
* @return #GNUNET_YES if the coin is valid,
* #GNUNET_NO if it is invalid
* #GNUNET_SYSERR if an internal error occurred
*/
enum GNUNET_GenericReturnValue
TALER_test_coin_valid (const struct TALER_CoinPublicInfo *coin_public_info,
const struct TALER_DenominationPublicKey *denom_pub);
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Header for serializations of coin-specific information about the
* fresh coins we generate. These are the secrets that arise during
* planchet generation, which is the first stage of creating a new
* coin.
*/
struct TALER_PlanchetSecretsP
{
/**
* Private key of the coin.
*/
struct TALER_CoinSpendPrivateKeyP coin_priv;
/**
* The blinding key.
*/
struct TALER_DenominationBlindingKeyP blinding_key;
};
GNUNET_NETWORK_STRUCT_END
/**
* Details about a planchet that the customer wants to obtain
* a withdrawal authorization. This is the information that
* will need to be sent to the exchange to obtain the blind
* signature required to turn a planchet into a coin.
*/
struct TALER_PlanchetDetail
{
/**
* Hash of the denomination public key.
*/
struct GNUNET_HashCode denom_pub_hash;
/**
* Blinded coin (see GNUNET_CRYPTO_rsa_blind()). Note: is malloc()'ed!
*/
void *coin_ev;
/**
* Number of bytes in @a coin_ev.
*/
size_t coin_ev_size;
};
/**
* Information about a (fresh) coin, returned from the API when we
* finished creating a coin. Note that @e sig needs to be freed
* using the appropriate code.
*/
struct TALER_FreshCoin
{
/**
* The exchange's signature over the coin's public key.
*/
struct TALER_DenominationSignature sig;
/**
* The coin's private key.
*/
struct TALER_CoinSpendPrivateKeyP coin_priv;
};
GNUNET_NETWORK_STRUCT_BEGIN
/**
* @brief Secret used to decrypt the key to decrypt link secrets.
*/
struct TALER_TransferSecretP
{
/**
* Secret used to derive private inputs for refreshed coins.
* Must be (currently) a hash as this is what
* GNUNET_CRYPTO_ecc_ecdh() returns to us.
*/
struct GNUNET_HashCode key;
};
/**
* Length of the raw value in the Taler wire transfer identifier
* (in binary representation).
*/
#define TALER_BANK_TRANSFER_IDENTIFIER_LEN 32
/**
* #TALER_BANK_TRANSFER_IDENTIFIER_LEN as a string.
*/
#define TALER_BANK_TRANSFER_IDENTIFIER_LEN_STR "32"
/**
* Raw value of a wire transfer subjects, without the checksum.
*/
struct TALER_WireTransferIdentifierRawP
{
/**
* Raw value. Note that typical payment systems (SEPA, ACH) support
* at least two lines of 27 ASCII characters to encode a transaction
* subject or "details", for a total of 54 characters. (The payment
* system protocols often support more lines, but the forms presented
* to customers are usually limited to 54 characters.)
*
* With a Base32-encoding of 5 bit per character, this gives us 270
* bits or (rounded down) 33 bytes. So we use the first 32 bytes to
* encode the actual value (i.e. a 256-bit / 32-byte public key or
* a hash code), and the last byte for a minimalistic checksum.
*/
uint8_t raw[TALER_BANK_TRANSFER_IDENTIFIER_LEN];
};
/**
* Binary information encoded in Crockford's Base32 in wire transfer
* subjects of transfers from Taler to a merchant. The actual value
* is chosen by the exchange and has no particular semantics, other than
* being unique so that the exchange can lookup details about the wire
* transfer when needed.
*/
struct TALER_WireTransferIdentifierP
{
/**
* Raw value.
*/
struct TALER_WireTransferIdentifierRawP raw;
/**
* Checksum using CRC8 over the @e raw data.
*/
uint8_t crc8;
};
GNUNET_NETWORK_STRUCT_END
/**
* Setup information for a fresh coin, deriving the coin private key
* and the blinding factor from the @a secret_seed with a KDF salted
* by the @a coin_num_salt.
*
* @param secret_seed seed to use for KDF to derive coin keys
* @param coin_num_salt number of the coin to include in KDF
* @param[out] ps value to initialize
*/
void
TALER_planchet_setup_refresh (const struct TALER_TransferSecretP *secret_seed,
uint32_t coin_num_salt,
struct TALER_PlanchetSecretsP *ps);
/**
* Setup information for a fresh coin.
*
* @param[out] ps value to initialize
*/
void
TALER_planchet_setup_random (struct TALER_PlanchetSecretsP *ps);
/**
* Prepare a planchet for tipping. Creates and blinds a coin.
*
* @param dk denomination key for the coin to be created
* @param ps secret planchet internals (for #TALER_planchet_to_coin)
* @param[out] c_hash set to the hash of the public key of the coin (needed later)
* @param[out] pd set to the planchet detail for TALER_MERCHANT_tip_pickup() and
* other withdraw operations
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
TALER_planchet_prepare (const struct TALER_DenominationPublicKey *dk,
const struct TALER_PlanchetSecretsP *ps,
struct GNUNET_HashCode *c_hash,
struct TALER_PlanchetDetail *pd);
/**
* Obtain a coin from the planchet's secrets and the blind signature
* of the exchange.
*
* @param dk denomination key, must match what was given to #TALER_planchet_prepare()
* @param blind_sig blind signature from the exchange
* @param ps secrets from #TALER_planchet_prepare()
* @param c_hash hash of the coin's public key for verification of the signature
* @param[out] coin set to the details of the fresh coin
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
TALER_planchet_to_coin (const struct TALER_DenominationPublicKey *dk,
const struct GNUNET_CRYPTO_RsaSignature *blind_sig,
const struct TALER_PlanchetSecretsP *ps,
const struct GNUNET_HashCode *c_hash,
struct TALER_FreshCoin *coin);
/* ****************** Refresh crypto primitives ************* */
/**
* Given the coin and the transfer private keys, compute the
* transfer secret. (Technically, we only need one of the two
* private keys, but the caller currently trivially only has
* the two private keys, so we derive one of the public keys
* internally to this function.)
*
* @param coin_priv coin key
* @param trans_priv transfer private key
* @param[out] ts computed transfer secret
*/
void
TALER_link_derive_transfer_secret (
const struct TALER_CoinSpendPrivateKeyP *coin_priv,
const struct TALER_TransferPrivateKeyP *trans_priv,
struct TALER_TransferSecretP *ts);
/**
* Decrypt the shared @a secret from the information in the
* @a trans_priv and @a coin_pub.
*
* @param trans_priv transfer private key
* @param coin_pub coin public key
* @param[out] transfer_secret set to the shared secret
*/
void
TALER_link_reveal_transfer_secret (
const struct TALER_TransferPrivateKeyP *trans_priv,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_TransferSecretP *transfer_secret);
/**
* Decrypt the shared @a secret from the information in the
* @a trans_priv and @a coin_pub.
*
* @param trans_pub transfer private key
* @param coin_priv coin public key
* @param[out] transfer_secret set to the shared secret
*/
void
TALER_link_recover_transfer_secret (
const struct TALER_TransferPublicKeyP *trans_pub,
const struct TALER_CoinSpendPrivateKeyP *coin_priv,
struct TALER_TransferSecretP *transfer_secret);
/**
* Information about a coin to be created during a refresh operation.
*/
struct TALER_RefreshCoinData
{
/**
* The denomination's public key.
*/
const struct TALER_DenominationPublicKey *dk;
/**
* The envelope with the blinded coin.
*/
void *coin_ev;
/**
* Number of bytes in @a coin_ev
*/
size_t coin_ev_size;
};
/**
* One of the #TALER_CNC_KAPPA commitments.
*/
struct TALER_RefreshCommitmentEntry
{
/**
* Transfer public key of this commitment.
*/
struct TALER_TransferPublicKeyP transfer_pub;
/**
* Array of @e num_new_coins new coins to be created.
*/
struct TALER_RefreshCoinData *new_coins;
};
/**
* Compute the commitment for a /refresh/melt operation from
* the respective public inputs.
*
* @param[out] rc set to the value the wallet must commit to
* @param kappa number of transfer public keys involved (must be #TALER_CNC_KAPPA)
* @param num_new_coins number of new coins to be created
* @param rcs array of @a kappa commitments
* @param coin_pub public key of the coin to be melted
* @param amount_with_fee amount to be melted, including fee
*/
void
TALER_refresh_get_commitment (struct TALER_RefreshCommitmentP *rc,
uint32_t kappa,
uint32_t num_new_coins,
const struct TALER_RefreshCommitmentEntry *rcs,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_Amount *amount_with_fee);
/* **************** Helper-based RSA operations **************** */
/**
* Handle for talking to an Denomination key signing helper.
*/
struct TALER_CRYPTO_DenominationHelper;
/**
* Function called with information about available keys for signing. Usually
* only called once per key upon connect. Also called again in case a key is
* being revoked, in that case with an @a end_time of zero.
*
* @param cls closure
* @param section_name name of the denomination type in the configuration;
* NULL if the key has been revoked or purged
* @param start_time when does the key become available for signing;
* zero if the key has been revoked or purged
* @param validity_duration how long does the key remain available for signing;
* zero if the key has been revoked or purged
* @param h_denom_pub hash of the @a denom_pub that is available (or was purged)
* @param denom_pub the public key itself, NULL if the key was revoked or purged
* @param sm_pub public key of the security module, NULL if the key was revoked or purged
* @param sm_sig signature from the security module, NULL if the key was revoked or purged
* The signature was already verified against @a sm_pub.
*/
typedef void
(*TALER_CRYPTO_DenominationKeyStatusCallback)(
void *cls,
const char *section_name,
struct GNUNET_TIME_Absolute start_time,
struct GNUNET_TIME_Relative validity_duration,
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_DenominationPublicKey *denom_pub,
const struct TALER_SecurityModulePublicKeyP *sm_pub,
const struct TALER_SecurityModuleSignatureP *sm_sig);
/**
* Initiate connection to an denomination key helper.
*
* @param cfg configuration to use
* @param dkc function to call with key information
* @param dkc_cls closure for @a dkc
* @return NULL on error (such as bad @a cfg).
*/
struct TALER_CRYPTO_DenominationHelper *
TALER_CRYPTO_helper_denom_connect (
const struct GNUNET_CONFIGURATION_Handle *cfg,
TALER_CRYPTO_DenominationKeyStatusCallback dkc,
void *dkc_cls);
/**
* Function to call to 'poll' for updates to the available key material.
* Should be called whenever it is important that the key material status is
* current, like when handling a "/keys" request. This function basically
* briefly checks if there are messages from the helper announcing changes to
* denomination keys.
*
* @param dh helper process connection
*/
void
TALER_CRYPTO_helper_denom_poll (struct TALER_CRYPTO_DenominationHelper *dh);
/**
* Request helper @a dh to sign @a msg using the public key corresponding to
* @a h_denom_pub.
*
* This operation will block until the signature has been obtained. Should
* this process receive a signal (that is not ignored) while the operation is
* pending, the operation will fail. Note that the helper may still believe
* that it created the signature. Thus, signals may result in a small
* differences in the signature counters. Retrying in this case may work.
*
* @param dh helper process connection
* @param h_denom_pub hash of the public key to use to sign
* @param msg message to sign
* @param msg_size number of bytes in @a msg
* @param[out] ec set to the error code (or #TALER_EC_NONE on success)
* @return signature, the value inside the structure will be NULL on failure,
* see @a ec for details about the failure
*/
struct TALER_DenominationSignature
TALER_CRYPTO_helper_denom_sign (
struct TALER_CRYPTO_DenominationHelper *dh,
const struct GNUNET_HashCode *h_denom_pub,
const void *msg,
size_t msg_size,
enum TALER_ErrorCode *ec);
/**
* Ask the helper to revoke the public key associated with @param h_denom_pub .
* Will cause the helper to tell all clients that the key is now unavailable,
* and to create a replacement key.
*
* This operation will block until the revocation request has been
* transmitted. Should this process receive a signal (that is not ignored)
* while the operation is pending, the operation may fail. If the key is
* unknown, this function will also appear to have succeeded. To be sure that
* the revocation worked, clients must watch the denomination key status
* callback.
*
* @param dh helper to process connection
* @param h_denom_pub hash of the public key to revoke
*/
void
TALER_CRYPTO_helper_denom_revoke (
struct TALER_CRYPTO_DenominationHelper *dh,
const struct GNUNET_HashCode *h_denom_pub);
/**
* Close connection to @a dh.
*
* @param[in] dh connection to close
*/
void
TALER_CRYPTO_helper_denom_disconnect (
struct TALER_CRYPTO_DenominationHelper *dh);
/**
* Handle for talking to an online key signing helper.
*/
struct TALER_CRYPTO_ExchangeSignHelper;
/**
* Function called with information about available keys for signing. Usually
* only called once per key upon connect. Also called again in case a key is
* being revoked, in that case with an @a end_time of zero.
*
* @param cls closure
* @param start_time when does the key become available for signing;
* zero if the key has been revoked or purged
* @param validity_duration how long does the key remain available for signing;
* zero if the key has been revoked or purged
* @param exchange_pub the public key itself, NULL if the key was revoked or purged
* @param sm_pub public key of the security module, NULL if the key was revoked or purged
* @param sm_sig signature from the security module, NULL if the key was revoked or purged
* The signature was already verified against @a sm_pub.
*/
typedef void
(*TALER_CRYPTO_ExchangeKeyStatusCallback)(
void *cls,
struct GNUNET_TIME_Absolute start_time,
struct GNUNET_TIME_Relative validity_duration,
const struct TALER_ExchangePublicKeyP *exchange_pub,
const struct TALER_SecurityModulePublicKeyP *sm_pub,
const struct TALER_SecurityModuleSignatureP *sm_sig);
/**
* Initiate connection to an online signing key helper.
*
* @param cfg configuration to use
* @param ekc function to call with key information
* @param ekc_cls closure for @a ekc
* @return NULL on error (such as bad @a cfg).
*/
struct TALER_CRYPTO_ExchangeSignHelper *
TALER_CRYPTO_helper_esign_connect (
const struct GNUNET_CONFIGURATION_Handle *cfg,
TALER_CRYPTO_ExchangeKeyStatusCallback ekc,
void *ekc_cls);
/**
* Function to call to 'poll' for updates to the available key material.
* Should be called whenever it is important that the key material status is
* current, like when handling a "/keys" request. This function basically
* briefly checks if there are messages from the helper announcing changes to
* exchange online signing keys.
*
* @param esh helper process connection
*/
void
TALER_CRYPTO_helper_esign_poll (struct TALER_CRYPTO_ExchangeSignHelper *esh);
/**
* Request helper @a esh to sign @a msg using the current online
* signing key.
*
* This operation will block until the signature has been obtained. Should
* this process receive a signal (that is not ignored) while the operation is
* pending, the operation will fail. Note that the helper may still believe
* that it created the signature. Thus, signals may result in a small
* differences in the signature counters. Retrying in this case may work.
*
* @param esh helper process connection
* @param purpose message to sign (must extend beyond the purpose)
* @param[out] exchange_pub set to the public key used for the signature upon success
* @param[out] exchange_sig set to the signature upon success
* @return the error code (or #TALER_EC_NONE on success)
*/
enum TALER_ErrorCode
TALER_CRYPTO_helper_esign_sign_ (
struct TALER_CRYPTO_ExchangeSignHelper *esh,
const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
struct TALER_ExchangePublicKeyP *exchange_pub,
struct TALER_ExchangeSignatureP *exchange_sig);
/**
* Request helper @a esh to sign @a msg using the current online
* signing key.
*
* This operation will block until the signature has been obtained. Should
* this process receive a signal (that is not ignored) while the operation is
* pending, the operation will fail. Note that the helper may still believe
* that it created the signature. Thus, signals may result in a small
* differences in the signature counters. Retrying in this case may work.
*
* @param esh helper process connection
* @param ps message to sign (MUST begin with a purpose)
* @param[out] epub set to the public key used for the signature upon success
* @param[out] esig set to the signature upon success
* @return the error code (or #TALER_EC_NONE on success)
*/
#define TALER_CRYPTO_helper_esign_sign(esh,ps,epub,esig) ( \
/* check size is set correctly */ \
GNUNET_assert (ntohl ((ps)->purpose.size) == sizeof (*ps)), \
/* check 'ps' begins with the purpose */ \
GNUNET_static_assert (((void*) (ps)) == \
((void*) &(ps)->purpose)), \
TALER_CRYPTO_helper_esign_sign_ (esh, \
&(ps)->purpose, \
epub, \
esig) )
/**
* Ask the helper to revoke the public key @param exchange_pub .
* Will cause the helper to tell all clients that the key is now unavailable,
* and to create a replacement key.
*
* This operation will block until the revocation request has been
* transmitted. Should this process receive a signal (that is not ignored)
* while the operation is pending, the operation may fail. If the key is
* unknown, this function will also appear to have succeeded. To be sure that
* the revocation worked, clients must watch the signing key status callback.
*
* @param esh helper to process connection
* @param exchange_pub the public key to revoke
*/
void
TALER_CRYPTO_helper_esign_revoke (
struct TALER_CRYPTO_ExchangeSignHelper *esh,
const struct TALER_ExchangePublicKeyP *exchange_pub);
/**
* Close connection to @a esh.
*
* @param[in] esh connection to close
*/
void
TALER_CRYPTO_helper_esign_disconnect (
struct TALER_CRYPTO_ExchangeSignHelper *esh);
/* ********************* wallet signing ************************** */
/**
* Sign link data.
*
* @param h_denom_pub hash of the denomiantion public key of the new coin
* @param transfer_pub transfer public key
* @param coin_ev coin envelope
* @param coin_ev_size number of bytes in @a coin_ev
* @param old_coin_priv private key to sign with
* @param[out] coin_sig resulting signature
*/
void
TALER_wallet_link_sign (const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_TransferPublicKeyP *transfer_pub,
const void *coin_ev,
size_t coin_ev_size,
const struct TALER_CoinSpendPrivateKeyP *old_coin_priv,
struct TALER_CoinSpendSignatureP *coin_sig);
/**
* Verify link signature.
*
* @param h_denom_pub hash of the denomiantion public key of the new coin
* @param transfer_pub transfer public key
* @param coin_ev coin envelope
* @param coin_ev_size number of bytes in @a coin_ev
* @param old_coin_priv private key to sign with
* @param coin_sig resulting signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_wallet_link_verify (
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_TransferPublicKeyP *transfer_pub,
const void *coin_ev,
size_t coin_ev_size,
const struct TALER_CoinSpendPublicKeyP *old_coin_pub,
const struct TALER_CoinSpendSignatureP *coin_sig);
/* ********************* offline signing ************************** */
/**
* Create auditor addition signature.
*
* @param auditor_pub public key of the auditor
* @param auditor_url URL of the auditor
* @param start_date when to enable the auditor (for replay detection)
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_auditor_add_sign (
const struct TALER_AuditorPublicKeyP *auditor_pub,
const char *auditor_url,
struct GNUNET_TIME_Absolute start_date,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify auditor add signature.
*
* @param auditor_pub public key of the auditor
* @param auditor_url URL of the auditor
* @param start_date when to enable the auditor (for replay detection)
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_auditor_add_verify (
const struct TALER_AuditorPublicKeyP *auditor_pub,
const char *auditor_url,
struct GNUNET_TIME_Absolute start_date,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create auditor deletion signature.
*
* @param auditor_pub public key of the auditor
* @param end_date when to disable the auditor (for replay detection)
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_auditor_del_sign (
const struct TALER_AuditorPublicKeyP *auditor_pub,
struct GNUNET_TIME_Absolute end_date,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify auditor del signature.
*
* @param auditor_pub public key of the auditor
* @param end_date when to disable the auditor (for replay detection)
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_auditor_del_verify (
const struct TALER_AuditorPublicKeyP *auditor_pub,
struct GNUNET_TIME_Absolute end_date,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create denomination revocation signature.
*
* @param h_denom_pub hash of public denomination key to revoke
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_denomination_revoke_sign (
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify denomination revocation signature.
*
* @param h_denom_pub hash of public denomination key to revoke
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_denomination_revoke_verify (
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create signkey revocation signature.
*
* @param exchange_pub public signing key to revoke
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_signkey_revoke_sign (
const struct TALER_ExchangePublicKeyP *exchange_pub,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify signkey revocation signature.
*
* @param exchange_pub public signkey key to revoke
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_signkey_revoke_verify (
const struct TALER_ExchangePublicKeyP *exchange_pub,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create signkey validity signature.
*
* @param exchange_pub public signing key to validate
* @param start_sign starting point of validity for signing
* @param end_sign end point (exclusive) for validity for signing
* @param end_legal legal end point of signature validity
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_signkey_validity_sign (
const struct TALER_ExchangePublicKeyP *exchange_pub,
struct GNUNET_TIME_Absolute start_sign,
struct GNUNET_TIME_Absolute end_sign,
struct GNUNET_TIME_Absolute end_legal,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify signkey validitity signature.
*
* @param exchange_pub public signkey key to validate
* @param start_sign starting point of validity for signing
* @param end_sign end point (exclusive) for validity for signing
* @param end_legal legal end point of signature validity
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_signkey_validity_verify (
const struct TALER_ExchangePublicKeyP *exchange_pub,
struct GNUNET_TIME_Absolute start_sign,
struct GNUNET_TIME_Absolute end_sign,
struct GNUNET_TIME_Absolute end_legal,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create denomination key validity signature.
*
* @param h_denom_pub hash of the denomination's public key
* @param stamp_start when does the exchange begin signing with this key
* @param stamp_expire_withdraw when does the exchange end signing with this key
* @param stamp_expire_deposit how long does the exchange accept the deposit of coins with this key
* @param stamp_expire_legal how long does the exchange preserve information for legal disputes with this key
* @param coin_value what is the value of coins signed with this key
* @param fee_withdraw what withdraw fee does the exchange charge for this denomination
* @param fee_deposit what deposit fee does the exchange charge for this denomination
* @param fee_refresh what refresh fee does the exchange charge for this denomination
* @param fee_refund what refund fee does the exchange charge for this denomination
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_denom_validity_sign (
const struct GNUNET_HashCode *h_denom_pub,
struct GNUNET_TIME_Absolute stamp_start,
struct GNUNET_TIME_Absolute stamp_expire_withdraw,
struct GNUNET_TIME_Absolute stamp_expire_deposit,
struct GNUNET_TIME_Absolute stamp_expire_legal,
const struct TALER_Amount *coin_value,
const struct TALER_Amount *fee_withdraw,
const struct TALER_Amount *fee_deposit,
const struct TALER_Amount *fee_refresh,
const struct TALER_Amount *fee_refund,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify denomination key validity signature.
*
* @param h_denom_pub hash of the denomination's public key
* @param stamp_start when does the exchange begin signing with this key
* @param stamp_expire_withdraw when does the exchange end signing with this key
* @param stamp_expire_deposit how long does the exchange accept the deposit of coins with this key
* @param stamp_expire_legal how long does the exchange preserve information for legal disputes with this key
* @param coin_value what is the value of coins signed with this key
* @param fee_withdraw what withdraw fee does the exchange charge for this denomination
* @param fee_deposit what deposit fee does the exchange charge for this denomination
* @param fee_refresh what refresh fee does the exchange charge for this denomination
* @param fee_refund what refund fee does the exchange charge for this denomination
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_denom_validity_verify (
const struct GNUNET_HashCode *h_denom_pub,
struct GNUNET_TIME_Absolute stamp_start,
struct GNUNET_TIME_Absolute stamp_expire_withdraw,
struct GNUNET_TIME_Absolute stamp_expire_deposit,
struct GNUNET_TIME_Absolute stamp_expire_legal,
const struct TALER_Amount *coin_value,
const struct TALER_Amount *fee_withdraw,
const struct TALER_Amount *fee_deposit,
const struct TALER_Amount *fee_refresh,
const struct TALER_Amount *fee_refund,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create security module EdDSA signature.
*
* @param exchange_pub public signing key to validate
* @param start_sign starting point of validity for signing
* @param duration how long will the key be in use
* @param secm_priv security module key to sign with
* @param[out] secm_sig where to write the signature
*/
void
TALER_exchange_secmod_eddsa_sign (
const struct TALER_ExchangePublicKeyP *exchange_pub,
struct GNUNET_TIME_Absolute start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePrivateKeyP *secm_priv,
struct TALER_SecurityModuleSignatureP *secm_sig);
/**
* Verify security module EdDSA signature.
*
* @param exchange_pub public signing key to validate
* @param start_sign starting point of validity for signing
* @param duration how long will the key be in use
* @param secm_pub public key to verify against
* @param secm_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_secmod_eddsa_verify (
const struct TALER_ExchangePublicKeyP *exchange_pub,
struct GNUNET_TIME_Absolute start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePublicKeyP *secm_pub,
const struct TALER_SecurityModuleSignatureP *secm_sig);
/**
* Create security module RSA signature.
*
* @param h_denom_pub hash of the public key to validate
* @param section_name name of the section in the configuration
* @param start_sign starting point of validity for signing
* @param duration how long will the key be in use
* @param secm_priv security module key to sign with
* @param[out] secm_sig where to write the signature
*/
void
TALER_exchange_secmod_rsa_sign (
const struct GNUNET_HashCode *h_denom_pub,
const char *section_name,
struct GNUNET_TIME_Absolute start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePrivateKeyP *secm_priv,
struct TALER_SecurityModuleSignatureP *secm_sig);
/**
* Verify security module RSA signature.
*
* @param h_denom_pub hash of the public key to validate
* @param section_name name of the section in the configuration
* @param start_sign starting point of validity for signing
* @param duration how long will the key be in use
* @param secm_pub public key to verify against
* @param secm_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_secmod_rsa_verify (
const struct GNUNET_HashCode *h_denom_pub,
const char *section_name,
struct GNUNET_TIME_Absolute start_sign,
struct GNUNET_TIME_Relative duration,
const struct TALER_SecurityModulePublicKeyP *secm_pub,
const struct TALER_SecurityModuleSignatureP *secm_sig);
/**
* Create denomination key validity signature by the auditor.
*
* @param auditor_url BASE URL of the auditor's API
* @param h_denom_pub hash of the denomination's public key
* @param master_pub master public key of the exchange
* @param stamp_start when does the exchange begin signing with this key
* @param stamp_expire_withdraw when does the exchange end signing with this key
* @param stamp_expire_deposit how long does the exchange accept the deposit of coins with this key
* @param stamp_expire_legal how long does the exchange preserve information for legal disputes with this key
* @param coin_value what is the value of coins signed with this key
* @param fee_withdraw what withdraw fee does the exchange charge for this denomination
* @param fee_deposit what deposit fee does the exchange charge for this denomination
* @param fee_refresh what refresh fee does the exchange charge for this denomination
* @param fee_refund what refund fee does the exchange charge for this denomination
* @param auditor_priv private key to sign with
* @param[out] auditor_sig where to write the signature
*/
void
TALER_auditor_denom_validity_sign (
const char *auditor_url,
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_MasterPublicKeyP *master_pub,
struct GNUNET_TIME_Absolute stamp_start,
struct GNUNET_TIME_Absolute stamp_expire_withdraw,
struct GNUNET_TIME_Absolute stamp_expire_deposit,
struct GNUNET_TIME_Absolute stamp_expire_legal,
const struct TALER_Amount *coin_value,
const struct TALER_Amount *fee_withdraw,
const struct TALER_Amount *fee_deposit,
const struct TALER_Amount *fee_refresh,
const struct TALER_Amount *fee_refund,
const struct TALER_AuditorPrivateKeyP *auditor_priv,
struct TALER_AuditorSignatureP *auditor_sig);
/**
* Verify denomination key validity signature from auditor.
*
* @param auditor_url BASE URL of the auditor's API
* @param h_denom_pub hash of the denomination's public key
* @param master_pub master public key of the exchange
* @param stamp_start when does the exchange begin signing with this key
* @param stamp_expire_withdraw when does the exchange end signing with this key
* @param stamp_expire_deposit how long does the exchange accept the deposit of coins with this key
* @param stamp_expire_legal how long does the exchange preserve information for legal disputes with this key
* @param coin_value what is the value of coins signed with this key
* @param fee_withdraw what withdraw fee does the exchange charge for this denomination
* @param fee_deposit what deposit fee does the exchange charge for this denomination
* @param fee_refresh what refresh fee does the exchange charge for this denomination
* @param fee_refund what refund fee does the exchange charge for this denomination
* @param auditor_pub public key to verify against
* @param auditor_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_auditor_denom_validity_verify (
const char *auditor_url,
const struct GNUNET_HashCode *h_denom_pub,
const struct TALER_MasterPublicKeyP *master_pub,
struct GNUNET_TIME_Absolute stamp_start,
struct GNUNET_TIME_Absolute stamp_expire_withdraw,
struct GNUNET_TIME_Absolute stamp_expire_deposit,
struct GNUNET_TIME_Absolute stamp_expire_legal,
const struct TALER_Amount *coin_value,
const struct TALER_Amount *fee_withdraw,
const struct TALER_Amount *fee_deposit,
const struct TALER_Amount *fee_refresh,
const struct TALER_Amount *fee_refund,
const struct TALER_AuditorPublicKeyP *auditor_pub,
const struct TALER_AuditorSignatureP *auditor_sig);
/* **************** /wire account offline signing **************** */
/**
* Create wire fee signature.
*
* @param payment_method the payment method
* @param start_time when do the fees start to apply
* @param end_time when do the fees start to apply
* @param wire_fee the wire fee
* @param closing_fee the closing fee
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_wire_fee_sign (
const char *payment_method,
struct GNUNET_TIME_Absolute start_time,
struct GNUNET_TIME_Absolute end_time,
const struct TALER_Amount *wire_fee,
const struct TALER_Amount *closing_fee,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify wire fee signature.
*
* @param payment_method the payment method
* @param start_time when do the fees start to apply
* @param end_time when do the fees start to apply
* @param wire_fee the wire fee
* @param closing_fee the closing fee
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_wire_fee_verify (
const char *payment_method,
struct GNUNET_TIME_Absolute start_time,
struct GNUNET_TIME_Absolute end_time,
const struct TALER_Amount *wire_fee,
const struct TALER_Amount *closing_fee,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create wire account addition signature.
*
* @param payto_uri bank account
* @param now timestamp to use for the signature (rounded)
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_wire_add_sign (
const char *payto_uri,
struct GNUNET_TIME_Absolute now,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify wire account addition signature.
*
* @param payto_uri bank account
* @param sign_time timestamp when signature was created
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_wire_add_verify (
const char *payto_uri,
struct GNUNET_TIME_Absolute sign_time,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create wire account removal signature.
*
* @param payto_uri bank account
* @param now timestamp to use for the signature (rounded)
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_offline_wire_del_sign (
const char *payto_uri,
struct GNUNET_TIME_Absolute now,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Verify wire account deletion signature.
*
* @param payto_uri bank account
* @param sign_time timestamp when signature was created
* @param master_pub public key to verify against
* @param master_sig the signature the signature
* @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_offline_wire_del_verify (
const char *payto_uri,
struct GNUNET_TIME_Absolute sign_time,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Compute the hash of the given wire details. The resulting
* hash is what is signed by the master key.
*
* @param payto_uri bank account
* @param[out] hc set to the hash
*/
void
TALER_exchange_wire_signature_hash (const char *payto_uri,
struct GNUNET_HashCode *hc);
/**
* Check the signature in @a master_sig.
*
* @param payto_uri URI that is signed
* @param master_pub master public key of the exchange
* @param master_sig signature of the exchange
* @return #GNUNET_OK if signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_exchange_wire_signature_check (
const char *payto_uri,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig);
/**
* Create a signed wire statement for the given account.
*
* @param payto_uri account specification
* @param master_priv private key to sign with
* @param[out] master_sig where to write the signature
*/
void
TALER_exchange_wire_signature_make (
const char *payto_uri,
const struct TALER_MasterPrivateKeyP *master_priv,
struct TALER_MasterSignatureP *master_sig);
/**
* Compute the hash of the given wire details. The resulting
* @a hc is what will be put into the contract between customer
* and merchant for signing by both parties.
*
* @param payto_uri bank account
* @param salt salt used to eliminate brute-force inversion
* @param[out] hc set to the hash
*/
void
TALER_merchant_wire_signature_hash (const char *payto_uri,
const char *salt,
struct GNUNET_HashCode *hc);
/**
* Check the signature in @a wire_s.
*
* @param payto_uri URL that is signed
* @param salt the salt used to salt the @a payto_uri when hashing
* @param merch_pub public key of the merchant
* @param merch_sig signature of the merchant
* @return #GNUNET_OK if signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_merchant_wire_signature_check (
const char *payto_uri,
const char *salt,
const struct TALER_MerchantPublicKeyP *merch_pub,
const struct TALER_MerchantSignatureP *merch_sig);
/**
* Create a signed wire statement for the given account.
*
* @param payto_uri account specification
* @param salt the salt used to salt the @a payto_uri when hashing
* @param merch_priv private key to sign with
* @param[out] merch_sig where to write the signature
*/
void
TALER_merchant_wire_signature_make (
const char *payto_uri,
const char *salt,
const struct TALER_MerchantPrivateKeyP *merch_priv,
struct TALER_MerchantSignatureP *merch_sig);
/**
* Blinds the given message with the given blinding key
*
* @param hash hash of the message to sign
* @param bks the blinding key
* @param pkey the public key of the signer
* @param[out] buf set to a buffer with the blinded message to be signed
* @param[out] buf_size number of bytes stored in @a buf
* @return #GNUNET_YES if successful, #GNUNET_NO if RSA key is malicious
*/
enum GNUNET_GenericReturnValue
TALER_rsa_blind (const struct GNUNET_HashCode *hash,
const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks,
struct GNUNET_CRYPTO_RsaPublicKey *pkey,
void **buf,
size_t *buf_size);
/**
* Unblind a blind-signed signature. The signature should have been generated
* with GNUNET_CRYPTO_rsa_sign() using a hash that was blinded with
* GNUNET_CRYPTO_rsa_blind().
*
* @param sig the signature made on the blinded signature purpose
* @param bks the blinding key secret used to blind the signature purpose
* @param pkey the public key of the signer
* @return unblinded signature on success, NULL if RSA key is bad or malicious.
*/
struct GNUNET_CRYPTO_RsaSignature *
TALER_rsa_unblind (const struct GNUNET_CRYPTO_RsaSignature *sig,
const struct GNUNET_CRYPTO_RsaBlindingKeySecret *bks,
struct GNUNET_CRYPTO_RsaPublicKey *pkey);
#endif