Add Sapling key classes to wallet, with new librustzcash APIs

src/zcash/Address.cpp

@@ -4,6 +4,8 @@
 #include "prf.h"
 #include "streams.h"
 
+#include <librustzcash.h>
+
 namespace libzcash {
 
 uint256 SproutPaymentAddress::GetHash() const {
@@ -36,6 +38,43 @@ SproutPaymentAddress SproutSpendingKey::address() const {
     return viewing_key().address();
 }
 
+//! Sapling
+SaplingFullViewingKey SaplingExpandedSpendingKey::full_viewing_key() const {
+    uint256 ak;
+    uint256 nk;
+    librustzcash_ask_to_ak(ask.begin(), ak.begin());
+    librustzcash_nsk_to_nk(nsk.begin(), nk.begin());
+    return SaplingFullViewingKey(ak, nk, ovk);
+}
+
+SaplingExpandedSpendingKey SaplingSpendingKey::expanded_spending_key() const {
+    return SaplingExpandedSpendingKey(PRF_ask(*this), PRF_nsk(*this), PRF_ovk(*this));
+}
+
+SaplingFullViewingKey SaplingSpendingKey::full_viewing_key() const {
+    return expanded_spending_key().full_viewing_key();
+}
+
+SaplingInViewingKey SaplingFullViewingKey::in_viewing_key() const {
+    uint256 ivk;
+    librustzcash_crh_ivk(ak.begin(), nk.begin(), ivk.begin());
+    return SaplingInViewingKey(ivk);
+}
+
+SaplingSpendingKey SaplingSpendingKey::random() {
+    return SaplingSpendingKey(random_uint256());
+}
+
+SaplingPaymentAddress SaplingInViewingKey::address(diversifier_t d) const {
+    uint256 pk_d;
+    librustzcash_ivk_to_pkd(this->begin(), d.data(), pk_d.begin());
+    return SaplingPaymentAddress(d, pk_d);
+}
+
+SaplingPaymentAddress SaplingSpendingKey::default_address() const {
+    return full_viewing_key().in_viewing_key().address(default_diversifier(*this));
+}
+
 }