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-rw-r--r--src/include/taler_crypto_lib.h180
1 files changed, 140 insertions, 40 deletions
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 39de34b8..d5024e6c 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -396,7 +396,83 @@ int
TALER_test_coin_valid (const struct TALER_CoinPublicInfo *coin_public_info);
-/* ****************** Refresh crypto primitives ************* */
+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;
+
+ /**
+ * Hash of the coin's public key. Kept around so we do not need to
+ * compute it again. Can be recomputed by hashing the public key
+ * of @a coin_priv if storage is at a premium.
+ */
+ struct GNUNET_HashCode c_hash;
+
+ /**
+ * Blinded coin (see GNUNET_CRYPTO_rsa_blind()). Note: is malloc()'ed!
+ */
+ char *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
@@ -426,6 +502,7 @@ struct TALER_TransferSecretP
*/
#define TALER_WIRE_TRANSFER_IDENTIFIER_LEN_STR "32"
+
/**
* Raw value of a wire transfer subjects, without the checksum.
*/
@@ -472,6 +549,68 @@ struct TALER_WireTransferIdentifierP
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] fc value to initialize
+ */
+void
+TALER_planchet_setup_refresh (const struct TALER_TransferSecretP *secret_seed,
+ unsigned int coin_num_salt,
+ struct TALER_PlanchetSecretsP *fc);
+
+
+/**
+ * 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] pd set to the planchet detail for TALER_MERCHANT_tip_pickup() and
+ * other withdraw operations
+ * @return #GNUNET_OK on success
+ */
+int
+TALER_planchet_prepare (const struct TALER_DenominationPublicKey *dk,
+ const struct TALER_PlanchetSecretsP *ps,
+ 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
+ */
+int
+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
@@ -516,44 +655,5 @@ TALER_link_recover_transfer_secret (const struct TALER_TransferPublicKeyP *trans
const struct TALER_CoinSpendPrivateKeyP *coin_priv,
struct TALER_TransferSecretP *transfer_secret);
-GNUNET_NETWORK_STRUCT_BEGIN
-
-/**
- * Header for serializations of coin-specific information about the
- * fresh coins we generate during a melt.
- */
-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
-
-
-/**
- * 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] fc value to initialize
- */
-void
-TALER_planchet_setup_refresh (const struct TALER_TransferSecretP *secret_seed,
- unsigned int coin_num_salt,
- struct TALER_PlanchetSecretsP *fc);
-
-
#endif