diff --git a/CocoaSecurity/CocoaSecurity.h b/CocoaSecurity/CocoaSecurity.h
index 2e6766e..e574fbd 100644
--- a/CocoaSecurity/CocoaSecurity.h
+++ b/CocoaSecurity/CocoaSecurity.h
@@ -33,30 +33,18 @@
 + (CocoaSecurityResult *)aesEncrypt:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv;
 + (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSData *)key iv:(NSData *)iv;
 + (CocoaSecurityResult *)aesEncryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv;
-- (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSString *)key;
-- (CocoaSecurityResult *)aesEncrypt:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv;
-- (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSData *)key iv:(NSData *)iv;
-- (CocoaSecurityResult *)aesEncryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv;
 #pragma mark AES Decrypt
 + (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSString *)key;
 + (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv;
 + (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSData *)key iv:(NSData *)iv;
 + (CocoaSecurityResult *)aesDecryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv;
-- (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSString *)key;
-- (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv;
-- (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSData *)key iv:(NSData *)iv;
-- (CocoaSecurityResult *)aesDecryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv;
 
 #pragma mark - MD5
 + (CocoaSecurityResult *)md5:(NSString *)hashString;
 + (CocoaSecurityResult *)md5WithData:(NSData *)hashData;
-- (CocoaSecurityResult *)md5:(NSString *)hashString;
-- (CocoaSecurityResult *)md5WithData:(NSData *)hashData;
 #pragma mark HMAC-MD5
 + (CocoaSecurityResult *)hmacMd5:(NSString *)hashString hmacKey:(NSString *)key;
 + (CocoaSecurityResult *)hmacMd5WithData:(NSData *)hashData hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacMd5:(NSString *)hashString hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacMd5WithData:(NSData *)hashData hmacKey:(NSString *)key;
 
 #pragma mark - SHA
 + (CocoaSecurityResult *)sha1:(NSString *)hashString;
@@ -69,16 +57,6 @@
 + (CocoaSecurityResult *)sha384WithData:(NSData *)hashData;
 + (CocoaSecurityResult *)sha512:(NSString *)hashString;
 + (CocoaSecurityResult *)sha512WithData:(NSData *)hashData;
-- (CocoaSecurityResult *)sha1:(NSString *)hashString;
-- (CocoaSecurityResult *)sha1WithData:(NSData *)hashData;
-- (CocoaSecurityResult *)sha224:(NSString *)hashString;
-- (CocoaSecurityResult *)sha224WithData:(NSData *)hashData;
-- (CocoaSecurityResult *)sha256:(NSString *)hashString;
-- (CocoaSecurityResult *)sha256WithData:(NSData *)hashData;
-- (CocoaSecurityResult *)sha384:(NSString *)hashString;
-- (CocoaSecurityResult *)sha384WithData:(NSData *)hashData;
-- (CocoaSecurityResult *)sha512:(NSString *)hashString;
-- (CocoaSecurityResult *)sha512WithData:(NSData *)hashData;
 #pragma mark HMAC-SHA
 + (CocoaSecurityResult *)hmacSha1:(NSString *)hashString hmacKey:(NSString *)key;
 + (CocoaSecurityResult *)hmacSha1WithData:(NSData *)hashData hmacKey:(NSString *)key;
@@ -90,16 +68,6 @@
 + (CocoaSecurityResult *)hmacSha384WithData:(NSData *)hashData hmacKey:(NSString *)key;
 + (CocoaSecurityResult *)hmacSha512:(NSString *)hashString hmacKey:(NSString *)key;
 + (CocoaSecurityResult *)hmacSha512WithData:(NSData *)hashData hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha1:(NSString *)hashString hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha1WithData:(NSData *)hashData hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha224:(NSString *)hashString hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha224WithData:(NSData *)hashData hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha256:(NSString *)hashString hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha256WithData:(NSData *)hashData hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha384:(NSString *)hashString hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha384WithData:(NSData *)hashData hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha512:(NSString *)hashString hmacKey:(NSString *)key;
-- (CocoaSecurityResult *)hmacSha512WithData:(NSData *)hashData hmacKey:(NSString *)key;
 @end
 
 
diff --git a/CocoaSecurity/CocoaSecurity.m b/CocoaSecurity/CocoaSecurity.m
index 82d3c79..16a5564 100644
--- a/CocoaSecurity/CocoaSecurity.m
+++ b/CocoaSecurity/CocoaSecurity.m
@@ -17,11 +17,6 @@
 #pragma mark - AES Encrypt
 // default AES Encrypt, key -> SHA384(key).sub(0, 32), iv -> SHA384(key).sub(32, 16)
 + (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesEncrypt:data key:key];
-}
-- (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSString *)key
 {
     CocoaSecurityResult * sha = [self sha384:key];
     NSData *aesKey = [sha.data subdataWithRange:NSMakeRange(0, 32)];
@@ -31,21 +26,6 @@
 }
 #pragma mark AES Encrypt 128, 192, 256
 + (CocoaSecurityResult *)aesEncrypt:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesEncrypt:data hexKey:key hexIv:iv];
-}
-+ (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSData *)key iv:(NSData *)iv
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesEncrypt:data key:key iv:iv];
-}
-+ (CocoaSecurityResult *)aesEncryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesEncryptWithData:data key:key iv:iv];
-}
-- (CocoaSecurityResult *)aesEncrypt:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv
 {
     CocoaSecurityDecoder *decoder = [CocoaSecurityDecoder new];
     NSData *aesKey = [decoder hex:key];
@@ -53,11 +33,11 @@
     
     return [self aesEncrypt:data key:aesKey iv:aesIv];
 }
-- (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSData *)key iv:(NSData *)iv
++ (CocoaSecurityResult *)aesEncrypt:(NSString *)data key:(NSData *)key iv:(NSData *)iv
 {
     return [self aesEncryptWithData:[data dataUsingEncoding:NSUTF8StringEncoding] key:key iv:iv];
 }
-- (CocoaSecurityResult *)aesEncryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv
++ (CocoaSecurityResult *)aesEncryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv
 {
     // check length of key and iv
     if ([iv length] != 16) {
@@ -105,11 +85,6 @@
 #pragma mark - AES Decrypt
 // default AES Decrypt, key -> SHA384(key).sub(0, 32), iv -> SHA384(key).sub(32, 16)
 + (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesDecryptWithBase64:data key:key];
-}
-- (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSString *)key
 {
     CocoaSecurityResult * sha = [self sha384:key];
     NSData *aesKey = [sha.data subdataWithRange:NSMakeRange(0, 32)];
@@ -119,21 +94,6 @@
 }
 #pragma mark AES Decrypt 128, 192, 256
 + (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesDecryptWithBase64:data hexKey:key hexIv:iv];
-}
-+ (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSData *)key iv:(NSData *)iv
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesDecryptWithBase64:data key:key iv:iv];
-}
-+ (CocoaSecurityResult *)aesDecryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs aesDecryptWithData:data key:key iv:iv];
-}
-- (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data hexKey:(NSString *)key hexIv:(NSString *)iv
 {
     CocoaSecurityDecoder *decoder = [CocoaSecurityDecoder new];
     NSData *aesKey = [decoder hex:key];
@@ -141,12 +101,12 @@
     
     return [self aesDecryptWithBase64:data key:aesKey iv:aesIv];
 }
-- (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSData *)key iv:(NSData *)iv
++ (CocoaSecurityResult *)aesDecryptWithBase64:(NSString *)data key:(NSData *)key iv:(NSData *)iv
 {
     CocoaSecurityDecoder *decoder = [CocoaSecurityDecoder new];
     return [self aesDecryptWithData:[decoder base64:data] key:key iv:iv];
 }
-- (CocoaSecurityResult *)aesDecryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv
++ (CocoaSecurityResult *)aesDecryptWithData:(NSData *)data key:(NSData *)key iv:(NSData *)iv
 {
     // check length of key and iv
     if ([iv length] != 16) {
@@ -195,20 +155,10 @@
 
 #pragma mark - MD5
 + (CocoaSecurityResult *)md5:(NSString *)hashString
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs md5:hashString];
-}
-+ (CocoaSecurityResult *)md5WithData:(NSData *)hashData
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs md5WithData:hashData];
-}
-- (CocoaSecurityResult *)md5:(NSString *)hashString
 {
     return [self md5WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding]];
 }
-- (CocoaSecurityResult *)md5WithData:(NSData *)hashData
++ (CocoaSecurityResult *)md5WithData:(NSData *)hashData
 {
     unsigned char *digest;
     digest = malloc(CC_MD5_DIGEST_LENGTH);
@@ -221,20 +171,10 @@
 }
 #pragma mark - HMAC-MD5
 + (CocoaSecurityResult *)hmacMd5:(NSString *)hashString hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacMd5:hashString hmacKey:key];
-}
-+ (CocoaSecurityResult *)hmacMd5WithData:(NSData *)hashData hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacMd5WithData:hashData hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacMd5:(NSString *)hashString hmacKey:(NSString *)key
 {
     return [self hmacMd5WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
 }
-- (CocoaSecurityResult *)hmacMd5WithData:(NSData *)hashData hmacKey:(NSString *)key
++ (CocoaSecurityResult *)hmacMd5WithData:(NSData *)hashData hmacKey:(NSString *)key
 {
     unsigned char *digest;
     digest = malloc(CC_MD5_DIGEST_LENGTH);
@@ -251,20 +191,10 @@
 
 #pragma mark - SHA1
 + (CocoaSecurityResult *)sha1:(NSString *)hashString
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha1:hashString];
-}
-+ (CocoaSecurityResult *)sha1WithData:(NSData *)hashData
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha1WithData:hashData];
-}
-- (CocoaSecurityResult *)sha1:(NSString *)hashString
 {
     return [self sha1WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding]];
 }
-- (CocoaSecurityResult *)sha1WithData:(NSData *)hashData
++ (CocoaSecurityResult *)sha1WithData:(NSData *)hashData
 {
     unsigned char *digest;
     digest = malloc(CC_SHA1_DIGEST_LENGTH);
@@ -277,20 +207,10 @@
 }
 #pragma mark SHA224
 + (CocoaSecurityResult *)sha224:(NSString *)hashString
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha224:hashString];
-}
-+ (CocoaSecurityResult *)sha224WithData:(NSData *)hashData
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha224WithData:hashData];
-}
-- (CocoaSecurityResult *)sha224:(NSString *)hashString
 {
     return [self sha224WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding]];
 }
-- (CocoaSecurityResult *)sha224WithData:(NSData *)hashData
++ (CocoaSecurityResult *)sha224WithData:(NSData *)hashData
 {
     unsigned char *digest;
     digest = malloc(CC_SHA224_DIGEST_LENGTH);
@@ -303,20 +223,10 @@
 }
 #pragma mark SHA256
 + (CocoaSecurityResult *)sha256:(NSString *)hashString
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha256:hashString];
-}
-+ (CocoaSecurityResult *)sha256WithData:(NSData *)hashData
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha256WithData:hashData];
-}
-- (CocoaSecurityResult *)sha256:(NSString *)hashString
 {
     return [self sha256WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding]];
 }
-- (CocoaSecurityResult *)sha256WithData:(NSData *)hashData
++ (CocoaSecurityResult *)sha256WithData:(NSData *)hashData
 {
     unsigned char *digest;
     digest = malloc(CC_SHA256_DIGEST_LENGTH);
@@ -329,20 +239,10 @@
 }
 #pragma mark SHA384
 + (CocoaSecurityResult *)sha384:(NSString *)hashString
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha384:hashString];
-}
-+ (CocoaSecurityResult *)sha384WithData:(NSData *)hashData
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha384WithData:hashData];
-}
-- (CocoaSecurityResult *)sha384:(NSString *)hashString
 {
     return [self sha384WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding]];
 }
-- (CocoaSecurityResult *)sha384WithData:(NSData *)hashData
++ (CocoaSecurityResult *)sha384WithData:(NSData *)hashData
 {
     unsigned char *digest;
     digest = malloc(CC_SHA384_DIGEST_LENGTH);
@@ -355,20 +255,10 @@
 }
 #pragma mark SHA512
 + (CocoaSecurityResult *)sha512:(NSString *)hashString
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha512:hashString];
-}
-+ (CocoaSecurityResult *)sha512WithData:(NSData *)hashData
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs sha512WithData:hashData];
-}
-- (CocoaSecurityResult *)sha512:(NSString *)hashString
 {
     return [self sha512WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding]];
 }
-- (CocoaSecurityResult *)sha512WithData:(NSData *)hashData
++ (CocoaSecurityResult *)sha512WithData:(NSData *)hashData
 {
     unsigned char *digest;
     digest = malloc(CC_SHA512_DIGEST_LENGTH);
@@ -383,20 +273,10 @@
 
 #pragma mark - HMAC-SHA1
 + (CocoaSecurityResult *)hmacSha1:(NSString *)hashString hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha1:hashString hmacKey:key];
-}
-+ (CocoaSecurityResult *)hmacSha1WithData:(NSData *)hashData hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha1WithData:hashData hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacSha1:(NSString *)hashString hmacKey:(NSString *)key
 {
     return [self hmacSha1WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
 }
-- (CocoaSecurityResult *)hmacSha1WithData:(NSData *)hashData hmacKey:(NSString *)key
++ (CocoaSecurityResult *)hmacSha1WithData:(NSData *)hashData hmacKey:(NSString *)key
 {
     unsigned char *digest;
     digest = malloc(CC_SHA1_DIGEST_LENGTH);
@@ -412,19 +292,9 @@
 #pragma mark HMAC-SHA224
 + (CocoaSecurityResult *)hmacSha224:(NSString *)hashString hmacKey:(NSString *)key
 {
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha224:hashString hmacKey:key];
+   return [self hmacSha224WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
 }
 + (CocoaSecurityResult *)hmacSha224WithData:(NSData *)hashData hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha224WithData:hashData hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacSha224:(NSString *)hashString hmacKey:(NSString *)key
-{
-    return [self hmacSha224WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacSha224WithData:(NSData *)hashData hmacKey:(NSString *)key
 {
     unsigned char *digest;
     digest = malloc(CC_SHA224_DIGEST_LENGTH);
@@ -439,20 +309,10 @@
 }
 #pragma mark HMAC-SHA256
 + (CocoaSecurityResult *)hmacSha256:(NSString *)hashString hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha256:hashString hmacKey:key];
-}
-+ (CocoaSecurityResult *)hmacSha256WithData:(NSData *)hashData hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha256WithData:hashData hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacSha256:(NSString *)hashString hmacKey:(NSString *)key
 {
     return [self hmacSha256WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
 }
-- (CocoaSecurityResult *)hmacSha256WithData:(NSData *)hashData hmacKey:(NSString *)key
++ (CocoaSecurityResult *)hmacSha256WithData:(NSData *)hashData hmacKey:(NSString *)key
 {
     unsigned char *digest;
     digest = malloc(CC_SHA256_DIGEST_LENGTH);
@@ -467,20 +327,10 @@
 }
 #pragma mark HMAC-SHA384
 + (CocoaSecurityResult *)hmacSha384:(NSString *)hashString hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha384:hashString hmacKey:key];
-}
-+ (CocoaSecurityResult *)hmacSha384WithData:(NSData *)hashData hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha384WithData:hashData hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacSha384:(NSString *)hashString hmacKey:(NSString *)key
 {
     return [self hmacSha384WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
 }
-- (CocoaSecurityResult *)hmacSha384WithData:(NSData *)hashData hmacKey:(NSString *)key
++ (CocoaSecurityResult *)hmacSha384WithData:(NSData *)hashData hmacKey:(NSString *)key
 {
     unsigned char *digest;
     digest = malloc(CC_SHA384_DIGEST_LENGTH);
@@ -495,20 +345,10 @@
 }
 #pragma mark HMAC-SHA512
 + (CocoaSecurityResult *)hmacSha512:(NSString *)hashString hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha512:hashString hmacKey:key];
-}
-+ (CocoaSecurityResult *)hmacSha512WithData:(NSData *)hashData hmacKey:(NSString *)key
-{
-    CocoaSecurity *cs = [CocoaSecurity new];
-    return [cs hmacSha512WithData:hashData hmacKey:key];
-}
-- (CocoaSecurityResult *)hmacSha512:(NSString *)hashString hmacKey:(NSString *)key
 {
     return [self hmacSha512WithData:[hashString dataUsingEncoding:NSUTF8StringEncoding] hmacKey:key];
 }
-- (CocoaSecurityResult *)hmacSha512WithData:(NSData *)hashData hmacKey:(NSString *)key
++ (CocoaSecurityResult *)hmacSha512WithData:(NSData *)hashData hmacKey:(NSString *)key
 {
     unsigned char *digest;
     digest = malloc(CC_SHA512_DIGEST_LENGTH);