Introduce new libzcash Zcash protocol API and crypto constructions surrounding the zkSNARK circuit.

src/zcash/Note.hpp

@@ -0,0 +1,71 @@
+#ifndef _ZCNOTE_H_
+#define _ZCNOTE_H_
+
+#include "uint256.h"
+#include "Zcash.h"
+#include "Address.hpp"
+#include "NoteEncryption.hpp"
+
+namespace libzcash {
+
+class Note {
+public:
+    uint256 a_pk;
+    uint64_t value;
+    uint256 rho;
+    uint256 r;
+
+    Note(uint256 a_pk, uint64_t value, uint256 rho, uint256 r)
+        : a_pk(a_pk), value(value), rho(rho), r(r) {}
+
+    Note();
+
+    uint256 cm() const;
+    uint256 nullifier(const SpendingKey& a_sk) const;
+};
+
+class NotePlaintext {
+public:
+    uint64_t value;
+    uint256 rho;
+    uint256 r;
+    boost::array<unsigned char, ZC_MEMO_SIZE> memo;
+
+    NotePlaintext() {}
+
+    NotePlaintext(const Note& note, boost::array<unsigned char, ZC_MEMO_SIZE> memo);
+
+    Note note(const PaymentAddress& addr) const;
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        unsigned char leadingByte = 0x00;
+        READWRITE(leadingByte);
+
+        if (leadingByte != 0x00) {
+            throw std::ios_base::failure("lead byte of NotePlaintext is not recognized");
+        }
+
+        READWRITE(value);
+        READWRITE(rho);
+        READWRITE(r);
+        READWRITE(memo);
+    }
+
+    static NotePlaintext decrypt(const ZCNoteDecryption& decryptor,
+                                 const ZCNoteDecryption::Ciphertext& ciphertext,
+                                 const uint256& ephemeralKey,
+                                 const uint256& h_sig,
+                                 unsigned char nonce
+                                );
+
+    ZCNoteEncryption::Ciphertext encrypt(ZCNoteEncryption& encryptor,
+                                         const uint256& pk_enc
+                                        ) const;
+};
+
+}
+
+#endif // _ZCNOTE_H_