iOS常用的密碼編譯演算法

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在iOS開發中，為了資料的安全經常對內容進行加密，在這兒我們對常用的密碼編譯演算法進行了總結：

1、MD5

<span style="font-size:18px;">+ (NSString *)md5Hash:(NSString *)str {    const char *cStr = [str UTF8String];    unsigned char result[16];    CC_MD5( cStr, strlen(cStr), result );    NSString *md5Result = [NSString stringWithFormat:                           @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",                           result[0], result[1], result[2], result[3],                           result[4], result[5], result[6], result[7],                           result[8], result[9], result[10], result[11],                           result[12], result[13], result[14], result[15]                           ];    return md5Result;}</span>

2. SHA1數位簽章演算法

<span style="font-size:18px;">const char *cstr = [str cStringUsingEncoding:NSUTF8StringEncoding];    NSData *data = [NSData dataWithBytes:cstr length:str.length];        uint8_t digest[CC_SHA1_DIGEST_LENGTH];        CC_SHA1(data.bytes, data.length, digest);        NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];        for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {        [output appendFormat:@"%02x", digest[i]];    }        return output;</span>

3.AES密碼編譯演算法

<span style="font-size:18px;">- (NSData *)AES256EncryptWithKey:(NSString *)key {//加密    char keyPtr[kCCKeySizeAES256+1];    bzero(keyPtr, sizeof(keyPtr));    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];    NSUInteger dataLength = [self length];    size_t bufferSize = dataLength + kCCBlockSizeAES128;    void *buffer = malloc(bufferSize);    size_t numBytesEncrypted = 0;    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,                                          kCCOptionPKCS7Padding | kCCOptionECBMode,                                          keyPtr, kCCBlockSizeAES128,                                          NULL,                                          [self bytes], dataLength,                                          buffer, bufferSize,                                          &numBytesEncrypted);    if (cryptStatus == kCCSuccess) {        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];    }    free(buffer);    return nil;}- (NSData *)AES256DecryptWithKey:(NSString *)key {//解密    char keyPtr[kCCKeySizeAES256+1];    bzero(keyPtr, sizeof(keyPtr));    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];    NSUInteger dataLength = [self length];    size_t bufferSize = dataLength + kCCBlockSizeAES128;    void *buffer = malloc(bufferSize);    size_t numBytesDecrypted = 0;    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,                                          kCCOptionPKCS7Padding | kCCOptionECBMode,                                          keyPtr, kCCBlockSizeAES128,                                          NULL,                                          [self bytes], dataLength,                                          buffer, bufferSize,                                          &numBytesDecrypted);    if (cryptStatus == kCCSuccess) {        return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];    }    free(buffer);    return nil;}</span>

4、BASE64編碼

 

<span style="font-size:18px;">+ (NSString*)encodeBase64String:(NSString * )input {     NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];     data = [GTMBase64 encodeData:data];     NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]; return base64String;}+ (NSString*)decodeBase64String:(NSString * )input {     NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];     data = [GTMBase64 decodeData:data];     NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]; return base64String;} + (NSString*)encodeBase64Data:(NSData *)data {data = [GTMBase64 encodeData:data];     NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];return base64String;}+ (NSString*)decodeBase64Data:(NSData *)data {data = [GTMBase64 decodeData:data];     NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];return base64String;}</span>