Generate test vectors for Sapling generators

sapling_generators.py

@@ -1,7 +1,9 @@
 #!/usr/bin/env python3
+from binascii import hexlify
 from pyblake2 import blake2s
 
 from sapling_jubjub import Point, JUBJUB_COFACTOR
+from sapling_utils import chunk
 
 # First 64 bytes of the BLAKE2s input during group hash.
 # This is chosen to be some random string that we couldn't have
@@ -46,3 +48,47 @@ NOTE_POSITION_BASE = find_group_hash(b'Zcash_J_', b'')
 WINDOWED_PEDERSEN_RANDOMNESS_BASE = find_group_hash(b'Zcash_PH', b'r')
 VALUE_COMMITMENT_VALUE_BASE = find_group_hash(b'Zcash_cv', b'v')
 VALUE_COMMITMENT_RANDOMNESS_BASE = find_group_hash(b'Zcash_cv', b'r')
+
+
+def main():
+    print('''
+        struct SaplingGenerators {
+            skb: [u8; 32],
+            pkb: [u8; 32],
+            npb: [u8; 32],
+            wprb: [u8; 32],
+            vcvb: [u8; 32],
+            vcrb: [u8; 32],
+        };
+
+        let sapling_generators = SaplingGenerators {
+            skb: [
+                %s
+            ],
+            pkb: [
+                %s
+            ],
+            npb: [
+                %s
+            ],
+            wprb: [
+                %s
+            ],
+            vcvb: [
+                %s
+            ],
+            vcrb: [
+                %s
+            ],
+        };''' % (
+            chunk(hexlify(bytes(SPENDING_KEY_BASE))),
+            chunk(hexlify(bytes(PROVING_KEY_BASE))),
+            chunk(hexlify(bytes(NOTE_POSITION_BASE))),
+            chunk(hexlify(bytes(WINDOWED_PEDERSEN_RANDOMNESS_BASE))),
+            chunk(hexlify(bytes(VALUE_COMMITMENT_VALUE_BASE))),
+            chunk(hexlify(bytes(VALUE_COMMITMENT_RANDOMNESS_BASE))),
+        ))
+
+
+if __name__ == '__main__':
+    main()