Refactored keccak interface

- Allow calculating keccak hash in steps
- Only allow 32 and 200 byte final hashes

tests/src/block_template_tests.cpp

@@ -77,7 +77,7 @@ TEST(block_template, update)
 	ASSERT_EQ(template_id, 1);
 
 	hash blobs_hash;
-	keccak(blobs.data(), static_cast<int>(blobs.size()), blobs_hash.h, HASH_SIZE);
+	keccak(blobs.data(), static_cast<int>(blobs.size()), blobs_hash.h);
 	ASSERT_EQ(blobs_hash, H("e9154971a27c412175562d23ab458b0d3cf780a8bcecf62ff3f667fed9d3bc1d"));
 
 	// Test 2: mempool with high fee and low fee transactions, it must choose high fee transactions

tests/src/keccak_tests.cpp

@@ -27,7 +27,7 @@ TEST(keccak, hashing)
 		hash output;
 		const uint8_t* data = reinterpret_cast<const uint8_t*>(input);
 		const int len = static_cast<int>(size);
-		keccak(data, len, output.h, HASH_SIZE);
+		keccak(data, len, output.h);
 
 		char buf[log::Stream::BUF_SIZE + 1];
 		log::Stream s(buf);