des 加密 iOS
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生成同名的Des.h文件和Des.m文件后，拷贝下方的代码可直接使用。注意在Des.m文件中将key值修改为项目所需的key。－－－》 #define DesKey
过程很简单，将字符串加密转成16进制字符串，以及将16进制字符串转成字符串。
以下是.h文件内容：
// // Des.h // desIOS // // Created by wusiping on 16/6/13. // Copyright © 2016年 wusiping. All rights reserved. // #import <Foundation/Foundation.h> /******字符串转base64（包括DES加密）******/ #define __DesEncodeString( string ) [Des hexStringFromText:string] /******base64（通过DES解密）转字符串******/ #define __DesDecodeString( HexString ) [Des textFromHexString:HexString] @interface Des : NSObject /** * 字符串加密转成16进制字符串 */ + (NSString *)hexStringFromText:(NSString *)string; /** * 16进制解密生成字符串 */ + (NSString *)textFromHexString:(NSString *)HexString; + (NSString *)base64EncodedStringFromData:(NSData *)data; + (NSString *)textFrombase64String:(NSString *)base64; @end
以下是.m文件内容：
//
// Des.m
// desIOS
//
// Created by wusiping on 16/6/13.
// Copyright © 2016年 wusiping. All rights reserved.
//
#import "Des.h"
//引入IOS自带密码库
#import <CommonCrypto/CommonCryptor.h>
//空字符串
#define LocalStr_None @""
#define DesKey @"com.nokia.parts"
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/";
@implementation Des
/**
* 字符串des加密转成16进制
*/
+ (NSString *)hexStringFromText:(NSString *)string
{
// string = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
if (string && ![string isEqualToString:LocalStr_None]) {
//取项目的bundleIdentifier作为KEY
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
//IOS 自带DES加密 Begin
data = [self DESEncrypt:data WithKey:DesKey];
//IOS 自带DES加密 End
return [self hexStringEncodedStringFromData:data];
}
else {
return LocalStr_None;
}
}
/**
* 把data 进行des加密成16进制
*/
+ (NSString *)hexStringEncodedStringFromData:(NSData *)data
{
Byte *bytes = (Byte *)[data bytes];
//下面是Byte 转换为16进制。
NSString *hexStr=@"";
for(int i=0;i<[data length];i++)
{
NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数
if([newHexStr length]==1)
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
return hexStr;
}
/**
* des解密16进制 转成字符串
*/
+ (NSString *)textFromHexString:(NSString *)HexString
{
NSInteger len = [HexString length] / 2; // Target length
unsigned char *buf = malloc(len);
unsigned char *whole_byte = buf;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [HexString length] / 2; i++) {
byte_chars[0] = [HexString characterAtIndex:i*2];
byte_chars[1] = [HexString characterAtIndex:i*2+1];
*whole_byte = strtol(byte_chars, NULL, 16);
whole_byte++;
}
NSData *result = [NSData dataWithBytes:buf length:len];
free(buf);
result = [self DESDecrypt:result WithKey:DesKey];
return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
}
//base64解密转string
+ (NSString *)textFrombase64String:(NSString *)base64
{
if (base64 && ![base64 isEqualToString:LocalStr_None]) {
//取项目的bundleIdentifier作为KEY
NSData *data = [self dataWithBase64EncodedString:base64];
//IOS 自带DES解密 Begin
data = [self DESDecrypt:data WithKey:DesKey];
//IOS 自带DES加密 End
return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}
else {
return LocalStr_None;
}
}
/************************************************************
函数名称 : + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
函数描述 : 文本数据进行DES加密
输入参数 : (NSData *)data
(NSString *)key
输出参数 : N/A
返回参数 : (NSData *)
备注信息 : 此函数不可用于过长文本
**********************************************************/
+ (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
{
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [data length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeDES,
NULL,
[data bytes], dataLength,
buffer, bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
/************************************************************
函数名称 : + (NSData *)DESEncrypt:(NSData *)data WithKey:(NSString *)key
函数描述 : 文本数据进行DES解密
输入参数 : (NSData *)data
(NSString *)key
输出参数 : N/A
返回参数 : (NSData *)
备注信息 : 此函数不可用于过长文本
**********************************************************/
+ (NSData *)DESDecrypt:(NSData *)data WithKey:(NSString *)key
{
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [data length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeDES,
NULL,
[data bytes], dataLength,
buffer, bufferSize,
&numBytesDecrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
}
free(buffer);
return nil;
}
/************************************************************
函数名称 : + (NSData *)dataWithBase64EncodedString:(NSString *)string
函数描述 : base64格式字符串转换为文本数据
输入参数 : (NSString *)string
输出参数 : N/A
返回参数 : (NSData *)
备注信息 :
**********************************************************/
+ (NSData *)dataWithBase64EncodedString:(NSString *)string
{
if (string == nil)
[NSException raise:NSInvalidArgumentException format:@""];
if ([string length] == 0)
return [NSData data];
static char *decodingTable = NULL;
if (decodingTable == NULL)
{
decodingTable = malloc(256);
if (decodingTable == NULL)
return nil;
memset(decodingTable, CHAR_MAX, 256);
NSUInteger i;
for (i = 0; i < 64; i++)
decodingTable[(short)encodingTable[i]] = i;
}
const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];
if (characters == NULL) // Not an ASCII string!
return nil;
char *bytes = malloc((([string length] + 3) / 4) * 3);
if (bytes == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (YES)
{
char buffer[4];
short bufferLength;
for (bufferLength = 0; bufferLength < 4; i++)
{
if (characters[i] == '\0')
break;
if (isspace(characters[i]) || characters[i] == '=')
continue;
buffer[bufferLength] = decodingTable[(short)characters[i]];
if (buffer[bufferLength++] == CHAR_MAX) // Illegal character!
{
free(bytes);
return nil;
}
}
if (bufferLength == 0)
break;
if (bufferLength == 1) // At least two characters are needed to produce one byte!
{
free(bytes);
return nil;
}
// Decode the characters in the buffer to bytes.
bytes[length++] = (buffer[0] << 2) | (buffer[1] >> 4);
if (bufferLength > 2)
bytes[length++] = (buffer[1] << 4) | (buffer[2] >> 2);
if (bufferLength > 3)
bytes[length++] = (buffer[2] << 6) | buffer[3];
}
bytes = realloc(bytes, length);
return [NSData dataWithBytesNoCopy:bytes length:length];
}
/**
* 加密生成base64
*/
+ (NSString *)base64EncodedStringFromData:(NSData *)data{
if ([data length] == 0)
return @"";
char *characters = malloc((([data length] + 2) / 3) * 4);
if (characters == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (i < [data length])
{
char buffer[3] = {0,0,0};
short bufferLength = 0;
while (bufferLength < 3 && i < [data length])
buffer[bufferLength++] = ((char *)[data bytes])[i++];
// Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.
characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];
characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
if (bufferLength > 1)
characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
else characters[length++] = '=';
if (bufferLength > 2)
characters[length++] = encodingTable[buffer[2] & 0x3F];
else characters[length++] = '=';
}
return [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES];
}
@end
