From 97e403bb665ccf736a840c28c717fa7b3dc8de30 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Wed, 15 Apr 2015 18:12:21 +0200
Subject: moving core refresh crypto logic to util -- towards fixing #3777

---
 src/include/taler_crypto_lib.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'src/include/taler_crypto_lib.h')

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index c3cbdcbab..dedeef5b0 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -423,6 +423,43 @@ struct TALER_RefreshLinkEncrypted
 };
 
 
+/**
+ * Decrypt the shared @a secret from the information in the
+ * encrypted link secret @e secret_enc using the transfer
+ * private key and the coin's public key.
+ * 
+ * @param secret_enc encrypted link secret
+ * @param transfer_priv transfer private key
+ * @param coin_pub coin public key
+ * @param[out] secret set to the shared secret
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+TALER_link_decrypt_secret (const struct TALER_EncryptedLinkSecretP *secret_enc,
+			   const struct TALER_TransferPrivateKeyP *trans_priv,
+			   const union TALER_CoinSpendPublicKeyP *coin_pub,
+			   struct TALER_LinkSecretP *secret);
+
+
+/**
+ * Encrypt the shared @a secret to generate the encrypted link secret.
+ * Also creates the transfer key.
+ * 
+ * @param secret link secret to encrypt 
+ * @param coin_pub coin public key
+ * @param transfer_priv[out] set to transfer private key
+ * @param transfer_pub[out] set to transfer public key
+ * @param[out] secret_enc set to the encryptd @a secret
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+TALER_link_encrypt_secret (const struct TALER_LinkSecretP *secret,
+			   const union TALER_CoinSpendPublicKeyP *coin_pub,
+			   struct TALER_TransferPrivateKeyP *trans_priv,
+			   struct TALER_TransferPublicKeyP *trans_pub,
+			   struct TALER_EncryptedLinkSecretP *secret_enc);
+
+
 /**
  * Use the @a trans_sec (from ECDHE) to decrypt the @a secret_enc
  * to obtain the @a secret to decrypt the linkage data.
-- 
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