遇到一個需求，支付密碼提交到服務器時使用blowfish加密，網上資料很少，找到的代碼也跟在線加密出來的結果對不上，在線加密（用來確認加密結果是否有誤）：

blowfish在線加密

Blowfish加密模式：ECB

填充模式：PKCS5Padding

輸出：base64

字符集：UTF8

最後在stackoverflow上找到了正解：

https://stackoverflow.com/questions/30860101/how-to-implement-blowfish-ecb-algorithm-pkcs5-padding-in-ios

是調用了原生API，自己稍微封裝了下，寫成NSString分類，分類.m文件中內容如下：

#import <CommonCrypto/CommonCryptor.h>

//核心代碼
+ (NSData *)doBlowfish:(NSData *)dataIn
               context:(CCOperation)kCCEncrypt_or_kCCDecrypt
                   key:(NSData *)key
               options:(CCOptions)options
                    iv:(NSData *)iv
                 error:(NSError 
 
**)error
{
    CCCryptorStatus ccStatus   = kCCSuccess;
    size_t          cryptBytes = 0;
    NSMutableData  *dataOut    = [NSMutableData dataWithLength:dataIn.length + kCCBlockSizeBlowfish];
    
    ccStatus = CCCrypt( kCCEncrypt_or_kCCDecrypt,
                       kCCAlgorithmBlowfish,
                       options,
                       key.bytes,
                       key.length,
                       (iv)
 
?nil:iv.bytes,
                       dataIn.bytes,
                       dataIn.length,
                       dataOut.mutableBytes,
                       dataOut.length,
                       &cryptBytes);
    
    if (ccStatus == kCCSuccess) {
        dataOut.length = cryptBytes;
    }
    else {
        if (error) {
            *error = [NSError errorWithDomain:@"kEncryptionError"
                                         code:ccStatus
                                     userInfo:nil];
        }
        dataOut = nil;
    }
    
    return dataOut;
}
//返回的是base64字符串-加密
- (NSString *)blowFishEncodingWithKey:(NSString *)pkey{
    if (pkey.length<8 || pkey.length>56) {
        NSLog(@"key值的長度必須在[8,56]之間");
        return nil;
    }
    NSError *error;
    NSData *key = [pkey dataUsingEncoding:NSUTF8StringEncoding];
    NSString *stringOriginal = self;
    NSData *dataOriginal = [stringOriginal dataUsingEncoding:NSUTF8StringEncoding];;
    
//    NSLog(@"key %@", key);
//    NSLog(@"stringOriginal %@", stringOriginal);
//    NSLog(@"dataOriginal   %@", dataOriginal);
    
    NSData *dataEncrypted = [NSString doBlowfish:dataOriginal
                                                   context:kCCEncrypt
                                                       key:key
                                                   options:kCCOptionPKCS7Padding | kCCOptionECBMode
                                                        iv:nil
                                                     error:&error];
//    NSLog(@"dataEncrypted  %@", dataEncrypted);
    
    NSString *encryptedBase64String = [dataEncrypted base64EncodedStringWithOptions:0];
//    NSLog(@"encryptedBase64String  %@", encryptedBase64String);
    return encryptedBase64String;
    
    
    
    
}
//需要base64字符串調用，返回的是解密結果-解密
- (NSString *)blowFishDecodingWithKey:(NSString *)pkey{
    if (pkey.length<8 || pkey.length>56) {
        NSLog(@"key值的長度必須在[8,56]之間");
        return nil;
    }
    NSError *error;
    NSData *key = [pkey dataUsingEncoding:NSUTF8StringEncoding];
    
    NSData *dataToDecrypt = [[NSData alloc] initWithBase64EncodedString:self options:0];
    
    NSData *dataDecrypted = [NSString doBlowfish:dataToDecrypt
                                         context:kCCDecrypt
                                             key:key
                                         options:kCCOptionPKCS7Padding | kCCOptionECBMode
                                              iv:nil
                                           error:&error];
//    NSLog(@"dataDecrypted  %@", dataDecrypted);
    
    NSString *stringDecrypted = [[NSString alloc] initWithData:dataDecrypted encoding:NSUTF8StringEncoding];
//    NSLog(@"stringDecrypted %@", stringDecrypted);
    return stringDecrypted;
}

使用時只需：

NSString * base64 = [@"123456" blowFishEncodingWithKey:@"12345678"];
NSString * result = [base64 blowFishDecodingWithKey:@"12345678"];
NSLog(@"加密後的base64：%@    解密結果：%@",base64,result);

相關參考資料：

簡書（我試過這個，加密出來的結果跟網站上的結果差一部分，暫時不知道原因）

iOS blowfish加密解密