vm: add tests for hashing instructions

These were cross-checked with the C# implementation.

pkg/vm/vm_test.go

@@ -2610,6 +2610,50 @@ func TestDupBool(t *testing.T) {
 	assert.Equal(t, true, vm.estack.Pop().Bool())
 }
 
+func TestSHA1(t *testing.T) {
+	// 0x0100 hashes to 0e356ba505631fbf715758bed27d503f8b260e3a
+	res := "0e356ba505631fbf715758bed27d503f8b260e3a"
+	prog := makeProgram(opcode.PUSHBYTES2, 1, 0,
+		opcode.SHA1)
+	vm := load(prog)
+	runVM(t, vm)
+	assert.Equal(t, 1, vm.estack.Len())
+	assert.Equal(t, res, hex.EncodeToString(vm.estack.Pop().Bytes()))
+}
+
+func TestSHA256(t *testing.T) {
+	// 0x0100 hashes to 47dc540c94ceb704a23875c11273e16bb0b8a87aed84de911f2133568115f254
+	res := "47dc540c94ceb704a23875c11273e16bb0b8a87aed84de911f2133568115f254"
+	prog := makeProgram(opcode.PUSHBYTES2, 1, 0,
+		opcode.SHA256)
+	vm := load(prog)
+	runVM(t, vm)
+	assert.Equal(t, 1, vm.estack.Len())
+	assert.Equal(t, res, hex.EncodeToString(vm.estack.Pop().Bytes()))
+}
+
+func TestHASH160(t *testing.T) {
+	// 0x0100 hashes to fbc22d517f38e7612798ece8e5957cf6c41d8caf
+	res := "fbc22d517f38e7612798ece8e5957cf6c41d8caf"
+	prog := makeProgram(opcode.PUSHBYTES2, 1, 0,
+		opcode.HASH160)
+	vm := load(prog)
+	runVM(t, vm)
+	assert.Equal(t, 1, vm.estack.Len())
+	assert.Equal(t, res, hex.EncodeToString(vm.estack.Pop().Bytes()))
+}
+
+func TestHASH256(t *testing.T) {
+	// 0x0100 hashes to 677b2d718464ee0121475600b929c0b4155667486577d1320b18c2dc7d4b4f99
+	res := "677b2d718464ee0121475600b929c0b4155667486577d1320b18c2dc7d4b4f99"
+	prog := makeProgram(opcode.PUSHBYTES2, 1, 0,
+		opcode.HASH256)
+	vm := load(prog)
+	runVM(t, vm)
+	assert.Equal(t, 1, vm.estack.Len())
+	assert.Equal(t, res, hex.EncodeToString(vm.estack.Pop().Bytes()))
+}
+
 func makeProgram(opcodes ...opcode.Opcode) []byte {
 	prog := make([]byte, len(opcodes)+1) // RET
 	for i := 0; i < len(opcodes); i++ {