diff --git a/tea_1.16.go b/tea_1.16.go
index 9384703..2c7cf56 100644
--- a/tea_1.16.go
+++ b/tea_1.16.go
@@ -48,7 +48,7 @@ func (t TEA) EncryptLittleEndianTo(src []byte, sumtable [0x10]uint32, dst []byte
 
 	var iv1, iv2, holder uint64
 	var v0, v1 uint32
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < fill+lens+7; i += 8 {
 		holder = binary.LittleEndian.Uint64(dst[i:]) ^ iv1
 		v0, v1 = uint32(holder>>32), uint32(holder)
 		for i := 0; i < 0x10; i++ {
@@ -124,7 +124,7 @@ func (t TEA) DecryptTo(data []byte, dst []byte) (from, to int) {
 
 	var iv1, iv2, holder uint64
 	var v0, v1 uint32
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < len(data); i += 8 {
 		iv1 = binary.BigEndian.Uint64(data[i:])
 		iv2 ^= iv1
 		v0, v1 = uint32(iv2>>32), uint32(iv2)
@@ -201,7 +201,7 @@ func (t TEA) DecryptLittleEndianTo(data []byte, sumtable [0x10]uint32, dst []byt
 
 	var iv1, iv2, holder uint64
 	var v0, v1 uint32
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < len(data); i += 8 {
 		iv1 = binary.LittleEndian.Uint64(data[i:])
 		iv2 ^= iv1
 		v0, v1 = uint32(iv2>>32), uint32(iv2)
diff --git a/tea_1.16_amd64.go b/tea_1.16_amd64.go
index ac0c4e1..1010468 100644
--- a/tea_1.16_amd64.go
+++ b/tea_1.16_amd64.go
@@ -35,8 +35,9 @@ func (t TEA) EncryptTo(src []byte, dst []byte) int {
 	binary.LittleEndian.PutUint32(dst[8:], randuint32())
 	dst[0] = byte(fill-3) | 0xF8 // 存储pad长度
 	copy(dst[fill:], src)
-	encrypt(uintptr(*(*unsafe.Pointer)(unsafe.Pointer(&dst)))|uintptr(len(dst)<<40), uintptr(unsafe.Pointer(&t))|(uintptr(len(dst)<<16)&0xffffff00_00000000))
-	return fill + lens + 7
+	dstlen := fill + lens + 7
+	encrypt(uintptr(*(*unsafe.Pointer)(unsafe.Pointer(&dst)))|uintptr(dstlen<<40), uintptr(unsafe.Pointer(&t))|(uintptr(dstlen<<16)&0xffffff00_00000000))
+	return dstlen
 }
 
 /*
diff --git a/tea_1.16_pure.go b/tea_1.16_pure.go
index 169e716..4176d25 100644
--- a/tea_1.16_pure.go
+++ b/tea_1.16_pure.go
@@ -78,7 +78,7 @@ func (t TEA) EncryptTo(src []byte, dst []byte) int {
 
 	var iv1, iv2, holder uint64
 	var v0, v1 uint32
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < fill+lens+7; i += 8 {
 		holder = binary.BigEndian.Uint64(dst[i:]) ^ iv1
 		v0, v1 = uint32(holder>>32), uint32(holder)
 		v0 += (v1 + 0x9e3779b9) ^ ((v1 << 4) + t[0]) ^ ((v1 >> 5) + t[1])
diff --git a/tea_1.17.go b/tea_1.17.go
index 9ba2fea..9d6a468 100644
--- a/tea_1.17.go
+++ b/tea_1.17.go
@@ -86,7 +86,7 @@ func (t TEA) EncryptLittleEndianTo(src []byte, sumtable [0x10]uint32, dst []byte
 	copy(dst[fill:], src)
 
 	var iv1, iv2, holder uint64
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < fill+lens+7; i += 8 {
 		block := binary.LittleEndian.Uint64(dst[i:])
 		holder = block ^ iv1
 		iv1 = t.encodeTable(holder, sumtable)
@@ -119,7 +119,7 @@ func (t TEA) DecryptTo(data []byte, dst []byte) (from, to int) {
 		return -1, -1
 	}
 	var iv1, iv2, holder uint64
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < len(data); i += 8 {
 		iv1 = binary.BigEndian.Uint64(data[i:])
 		iv2 ^= iv1
 		iv2 = t.decode(iv2)
@@ -150,7 +150,7 @@ func (t TEA) DecryptLittleEndianTo(data []byte, sumtable [0x10]uint32, dst []byt
 		return -1, -1
 	}
 	var iv1, iv2, holder uint64
-	for i := 0; i < len(dst); i += 8 {
+	for i := 0; i < len(data); i += 8 {
 		iv1 = binary.LittleEndian.Uint64(data[i:])
 		iv2 ^= iv1
 		iv2 = t.decodeTable(iv2, sumtable)