#define CC_MD5_DIGEST_LENGTH    16          /* digest length in bytes */

- (NSString *)md5:(NSDictionary *)paramsDict {
NSString *inString = [paramsDict stringValueForKey:@"data" defaultValue:@""];if (inString.length <= 0) {return @"";} else {const char *cStrValue = [inString UTF8String];//开辟一个16字节（128位：md5加密出来就是128位/bit）的空间（一个字节=8字位=8个二进制数）unsigned char outResult[CC_MD5_DIGEST_LENGTH];CC_MD5(cStrValue, strlen(cStrValue), outResult);//x表示十六进制，X  意思是不足两位将用0补齐，如果多余两位则不影响NSString *outString =[NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",outResult[0], outResult[1], outResult[2], outResult[3],outResult[4], outResult[5], outResult[6], outResult[7],outResult[8], outResult[9], outResult[10], outResult[11],outResult[12], outResult[13], outResult[14], outResult[15]];/*//方法二：NSMutableString *outString = [NSMutableString string];for (int i = 0; i < 16; i++) {[outString appendFormat:@"X", outResult[i]];}*/return outString;}}

- (NSString *) sha1:(NSString *)input
{const char *cstr = [input cStringUsingEncoding:NSUTF8StringEncoding];NSData *data = [NSData dataWithBytes:cstr length:input.length];//#define CC_SHA1_DIGEST_LENGTH   20       /* digest length in bytes */
    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;
}

- (NSData *)AES256EncryptWithKey:(NSString *)key  withString:(NSString *) inputString { //加密NSData *inData = [inString dataUsingEncoding:NSUTF8StringEncoding];/***//如果希望返回字符串，在开始时就开始对 NSData 做转换, 对应下面方法三，方法一和二使用上面语句即可const char *cstr = [inString cStringUsingEncoding:NSUTF8StringEncoding];NSData *inData = [NSData dataWithBytes:cstr length:inString.length];***/char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[APP_PUBLIC_PASSWORD getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength = [inData length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesEncrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[inData bytes], dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {NSData *outData = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];return outData;/***//如果需要返回 NSString 类型的结果，这里需要进行转换：// 方法一：NSString *outString = [[NSString alloc]initWithData:outData encoding:NSUTF8StringEncoding];   //失败，注意：这里 outString 为 nil，具体原因貌似是因为 NSData 内容含有非encoding编码的字符// 方法二：NSString *outString = [outData base64Encoding];// 方法三：（转换为2进制字符串）if (outData && outData.length > 0) {Byte *datas = (Byte*)[outData bytes];NSMutableString *outString = [NSMutableString stringWithCapacity:outData.length * 2];for(int i = 0; i < outData.length; i++){[outString appendFormat:@"%02x", datas[i]];}｝***/} free(buffer);return nil;
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//解密可以直接使用加密得到的结果 NSData, 这样将很容易，不必进行字符转换
- (NSData *)AES256DecryptWithKey:(NSString *)key withNSData:(NSString *)inData {//解密/***
- (NSData *)AES256DecryptWithKey:(NSString *)key withString:(NSString *)inputString {//解密//对应加密算法中的方法二：（解密前进行GTMBase64编码）NSData *inData = [GTMBase64 decodeString:inString];//对应加密算法中的方法三：NSMutableData *inData = [NSMutableData dataWithCapacity:inString.length / 2];unsigned char whole_byte;char byte_chars[3] = {'\0','\0','\0'};int i;for (i=0; i < [inString length] / 2; i++) {byte_chars[0] = [inString characterAtIndex:i*2];byte_chars[1] = [inString characterAtIndex:i*2+1];whole_byte = strtol(byte_chars, NULL, 16);[inData appendBytes:&whole_byte length:1];}***/     char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));//使用 "key": #define APP_PUBLIC_PASSWORD     @"boundary"[APP_PUBLIC_PASSWORD getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength = [inData length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesDecrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,          kCCAlgorithmAES128,kCCOptionPKCS7Padding | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[inData bytes], dataLength,buffer, bufferSize,&numBytesDecrypted);if (cryptStatus == kCCSuccess) {NSData *outData = [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];return outData;/***//若需返回 NSString，需要上面加密算法和解密算法的各个方法对应好，使用下列语句才不会返回 nil; 切记 dataLength 一定匹配好NSString *outString = [[NSString alloc]initWithData:outData encoding:NSUTF8StringEncoding];***/}free(buffer);return nil；
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