iOS blowfish加密解密

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

blowfish線上加密

Blowfish加密模式：ECB

填充模式：PKCS5Padding

輸出：base64

字元集：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檔案中內容如下：

#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