diff --git a/src/main/java/com/palnet/server/encrptn/kisa/KISA_SEED_CBC.java b/src/main/java/com/palnet/server/encrptn/kisa/KISA_SEED_CBC.java
index 7c6045f..cf3455d 100644
--- a/src/main/java/com/palnet/server/encrptn/kisa/KISA_SEED_CBC.java
+++ b/src/main/java/com/palnet/server/encrptn/kisa/KISA_SEED_CBC.java
@@ -164,8 +164,9 @@ public class KISA_SEED_CBC {
 	// R0, R1 : right input values at each round
 	// K : round keys at each round
 	private static final void SeedRound(int[] T, int LR[], int L0, int L1, int R0, int R1, int[] K, int K_offset) {
-		T[0] = LR[R0] ^ K[K_offset+0];
-		T[1] = LR[R1] ^ K[K_offset+1];
+		int offset1 = K_offset + 1;
+		T[0] = LR[R0] ^ K[K_offset];
+		T[1] = LR[R1] ^ K[offset1];
 		T[1] ^= T[0];
 		T[1] = SS0[GetB0(T[1])&0x0ff] ^ SS1[GetB1(T[1])&0x0ff] ^
 				SS2[GetB2(T[1])&0x0ff] ^ SS3[GetB3(T[1])&0x0ff];
@@ -877,10 +878,13 @@ public class KISA_SEED_CBC {
 		}
 
 		public static void byte_to_int(int[] dst, int dst_offset, byte[] src, int src_offset, int ENDIAN) {
+			int offset1 = src_offset + 1;
+			int offset2 = src_offset + 2;
+			int offset3 = src_offset + 3;
 			if(ENDIAN == BIG_ENDIAN) {
-				dst[dst_offset] = ((0x0ff&src[src_offset]) << 24) | ((0x0ff&src[src_offset+1]) << 16) | ((0x0ff&src[src_offset+2]) << 8) | ((0x0ff&src[src_offset+3]));
+				dst[dst_offset] = ((0x0ff&src[src_offset]) << 24) | ((0x0ff&src[offset1]) << 16) | ((0x0ff&src[offset2]) << 8) | ((0x0ff&src[offset3]));
 			} else {
-				dst[dst_offset] = ((0x0ff&src[src_offset])) | ((0x0ff&src[src_offset+1]) << 8) | ((0x0ff&src[src_offset+2]) << 16) | ((0x0ff&src[src_offset+3]) << 24);
+				dst[dst_offset] = ((0x0ff&src[src_offset])) | ((0x0ff&src[offset1]) << 8) | ((0x0ff&src[offset2]) << 16) | ((0x0ff&src[offset3]) << 24);
 			}
 		}
 		
@@ -928,7 +932,8 @@ public class KISA_SEED_CBC {
 			if(n >= 32)
 				return 0;
 			int v = x >> n;
-			int v_mask = ~(0x80000000 >> (n-1));
+			int shift = n - 1;
+			int v_mask = ~(0x80000000 >> shift);
 			return v & v_mask;
 		}
 		
diff --git a/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java b/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java
index 70d64d2..177a163 100644
--- a/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java
+++ b/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java
@@ -322,10 +322,13 @@ public class KISA_SHA256 {
 		}
 
 		public static void byte_to_int(int[] dst, int dst_offset, byte[] src, int src_offset, int ENDIAN) {
+			int offset1 = src_offset + 1;
+			int offset2 = src_offset + 2;
+			int offset3 = src_offset + 3;
 			if(ENDIAN == BIG_ENDIAN) {
-				dst[dst_offset] = ((0x0ff&src[src_offset]) << 24) | ((0x0ff&src[src_offset+1]) << 16) | ((0x0ff&src[src_offset+2]) << 8) | ((0x0ff&src[src_offset+3]));
+				dst[dst_offset] = ((0x0ff&src[src_offset]) << 24) | ((0x0ff&src[offset1]) << 16) | ((0x0ff&src[offset2]) << 8) | ((0x0ff&src[offset3]));
 			} else {
-				dst[dst_offset] = ((0x0ff&src[src_offset])) | ((0x0ff&src[src_offset+1]) << 8) | ((0x0ff&src[src_offset+2]) << 16) | ((0x0ff&src[src_offset+3]) << 24);
+				dst[dst_offset] = ((0x0ff&src[src_offset])) | ((0x0ff&src[offset1]) << 8) | ((0x0ff&src[offset2]) << 16) | ((0x0ff&src[offset3]) << 24);
 			}
 		}
 		
@@ -373,7 +376,8 @@ public class KISA_SHA256 {
 			if(n >= 32)
 				return 0;
 			int v = x >> n;
-			int v_mask = ~(0x80000000 >> (n-1));
+			int shift = n - 1;
+			int v_mask = ~(0x80000000 >> shift);
 			return v & v_mask;
 		}