92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
#include "Note.hpp"
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#include "prf.h"
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#include "crypto/sha256.h"
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#include "version.h"
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#include "streams.h"
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#include "zcash/util.h"
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namespace libzcash {
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Note::Note() {
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a_pk = random_uint256();
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rho = random_uint256();
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r = random_uint256();
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value = 0;
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}
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uint256 Note::cm() const {
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unsigned char discriminant = 0xb0;
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CSHA256 hasher;
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hasher.Write(&discriminant, 1);
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hasher.Write(a_pk.begin(), 32);
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auto value_vec = convertIntToVectorLE(value);
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hasher.Write(&value_vec[0], value_vec.size());
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hasher.Write(rho.begin(), 32);
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hasher.Write(r.begin(), 32);
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uint256 result;
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hasher.Finalize(result.begin());
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return result;
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}
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uint256 Note::nullifier(const SpendingKey& a_sk) const {
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return PRF_nf(a_sk, rho);
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}
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NotePlaintext::NotePlaintext(
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const Note& note,
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std::array<unsigned char, ZC_MEMO_SIZE> memo) : memo(memo)
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{
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value = note.value;
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rho = note.rho;
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r = note.r;
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}
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Note NotePlaintext::note(const PaymentAddress& addr) const
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{
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return Note(addr.a_pk, value, rho, r);
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}
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NotePlaintext NotePlaintext::decrypt(const ZCNoteDecryption& decryptor,
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const ZCNoteDecryption::Ciphertext& ciphertext,
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const uint256& ephemeralKey,
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const uint256& h_sig,
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unsigned char nonce
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)
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{
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auto plaintext = decryptor.decrypt(ciphertext, ephemeralKey, h_sig, nonce);
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << plaintext;
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NotePlaintext ret;
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ss >> ret;
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assert(ss.size() == 0);
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return ret;
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}
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ZCNoteEncryption::Ciphertext NotePlaintext::encrypt(ZCNoteEncryption& encryptor,
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const uint256& pk_enc
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) const
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{
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << (*this);
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ZCNoteEncryption::Plaintext pt;
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assert(pt.size() == ss.size());
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memcpy(&pt[0], &ss[0], pt.size());
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return encryptor.encrypt(pk_enc, pt);
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}
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} |