Initial project import

tools/v/vlib/crypto/sha3/xof_test.v

@@ -0,0 +1,80 @@
+module sha3
+
+fn test_shake256_streaming_matches_oneshot() {
+	data := 'hello world'.bytes()
+	// oneshot
+	expected := shake256(data, 64)
+
+	// streaming
+	mut s := new_shake256()
+	s.write(data)
+	result := s.read(64)
+
+	assert result == expected, 'streaming SHAKE-256 output differs from one-shot'
+}
+
+fn test_shake128_streaming_matches_oneshot() {
+	data := 'hello world'.bytes()
+	expected := shake128(data, 64)
+
+	mut s := new_shake128()
+	s.write(data)
+	result := s.read(64)
+
+	assert result == expected, 'streaming SHAKE-128 output differs from one-shot'
+}
+
+fn test_shake256_incremental_write() {
+	data := 'the quick brown fox jumps over the lazy dog'.bytes()
+	expected := shake256(data, 128)
+
+	mut s := new_shake256()
+	s.write(data[..10])
+	s.write(data[10..25])
+	s.write(data[25..])
+	result := s.read(128)
+
+	assert result == expected, 'incremental write produced different output'
+}
+
+fn test_shake256_incremental_read() {
+	data := 'test data for incremental reads'.bytes()
+
+	// all at once
+	mut s1 := new_shake256()
+	s1.write(data)
+	all_at_once := s1.read(200)
+
+	// in chunks
+	mut s2 := new_shake256()
+	s2.write(data)
+	mut chunked := []u8{}
+	chunked << s2.read(50)
+	chunked << s2.read(80)
+	chunked << s2.read(70)
+
+	assert chunked == all_at_once, 'incremental read produced different output'
+}
+
+fn test_shake128_large_output() {
+	data := 'large output test'.bytes()
+	mut s := new_shake128()
+	s.write(data)
+	// more than one block (168 bytes in shake128)
+	result := s.read(500)
+	assert result.len == 500
+}
+
+fn test_shake_reset() {
+	data := 'reset test'.bytes()
+
+	mut s := new_shake256()
+	s.write(data)
+	first := s.read(32)
+
+	s.reset()
+	s.write(data)
+	second := s.read(32)
+
+	assert first == second, 'reset did not restore initial state'
+}