IOS下DES加密
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内容图文
之前因为要使用DES加密，在网上找了好多，总于找到了，整理如下。
Des.h文件
//
//
Des.h
//
Copyright (c) 2014年 grant. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonCryptor.h>
@interface Des : NSObject
//DES加密
+ (NSString *) encryptStr:(NSString *) str key:(NSString *)sKey;
//DES解密
+ (NSString *) decryptStr:(NSString *) str key:(NSString *)sKey;
@end
Des.m文件
//
//
Des.m
//
Copyright (c) 2014年 grant. All rights reserved.
//
#import
"
Des.h
"
static
const
char _bas64EncodingTable[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
staticconstshort _base64DecodingTable[256] = {
-2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -2, -1, -1, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, -2, -2, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, -2, -2, -2,
-2, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2, -2,
-2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2
};
@implementation Des
+ (NSString *) encryptStr:(NSString *) str key:(NSString *)sKey
{
return [Des doCipher:str key:sKey context:kCCEncrypt];
}
+ (NSString *) decryptStr:(NSString *) str key:(NSString *)sKey
{
return [Des doCipher:str key:sKey context:kCCDecrypt];
}
+ (NSString *)doCipher:(NSString *)sTextIn key:(NSString *)sKey
context:(CCOperation)encryptOrDecrypt {
NSStringEncoding EnC = NSUTF8StringEncoding;
NSMutableData * dTextIn;
if (encryptOrDecrypt == kCCDecrypt) {
dTextIn = [[Des decodeBase64WithString:sTextIn] mutableCopy];
}
else{
dTextIn = [[sTextIn dataUsingEncoding: EnC] mutableCopy];
}
NSMutableData * dKey = [[sKey dataUsingEncoding:EnC] mutableCopy];
[dKey setLength:kCCBlockSizeDES];
uint8_t *bufferPtr1 = NULL;
size_t bufferPtrSize1 = 0;
size_t movedBytes1 = 0;
Byte iv[] = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
bufferPtrSize1 = ([sTextIn length] + kCCKeySizeDES) & ~(kCCKeySizeDES -1);
bufferPtr1 = malloc(bufferPtrSize1 * sizeof(uint8_t));
memset((void *)bufferPtr1, 0x00, bufferPtrSize1);
CCCrypt(encryptOrDecrypt,
kCCAlgorithmDES,
kCCOptionPKCS7Padding,
[dKey bytes],
[dKey length],
iv,
[dTextIn bytes],
[dTextIn length],
(void*)bufferPtr1,
bufferPtrSize1,
&movedBytes1);
NSString * sResult;
if (encryptOrDecrypt == kCCDecrypt){
sResult = [[ NSString alloc] initWithData:[NSData dataWithBytes:bufferPtr1
length:movedBytes1] encoding:EnC] ;
}
else {
NSData *dResult = [NSData dataWithBytes:bufferPtr1 length:movedBytes1];
sResult = [Des encodeBase64WithData:dResult];
}
return sResult;
}
+ (NSString *)encodeBase64WithData:(NSData *)objData {
const unsigned char * objRawData = [objData bytes];
char * objPointer;
char * strResult;
int intLength = [objData length];
if (intLength == 0) return nil;
strResult = (char *)calloc(((intLength + 2) / 3) * 4, sizeof(char));
objPointer = strResult;
while(intLength > 2) {
*objPointer++ = _bas64EncodingTable[objRawData[0] >> 2];
*objPointer++ = _bas64EncodingTable[((objRawData[0] & 0x03) << 4) + (objRawData[1] >> 4)];
*objPointer++ = _bas64EncodingTable[((objRawData[1] & 0x0f) << 2) + (objRawData[2] >> 6)];
*objPointer++ = _bas64EncodingTable[objRawData[2] & 0x3f];
objRawData += 3;
intLength -= 3;
}
if (intLength != 0) {
*objPointer++ = _bas64EncodingTable[objRawData[0] >> 2];
if (intLength > 1) {
*objPointer++ = _bas64EncodingTable[((objRawData[0] & 0x03) << 4) + (objRawData[1] >> 4)];
*objPointer++ = _bas64EncodingTable[(objRawData[1] & 0x0f) << 2];
*objPointer++ = ‘=‘;
} else {
*objPointer++ = _bas64EncodingTable[(objRawData[0] & 0x03) << 4];
*objPointer++ = ‘=‘;
*objPointer++ = ‘=‘;
}
}
*objPointer = ‘\0‘;
return[NSString stringWithCString:strResult encoding:NSASCIIStringEncoding];
}
+ (NSData *)decodeBase64WithString:(NSString *)strBase64 {
constchar* objPointer = [strBase64 cStringUsingEncoding:NSASCIIStringEncoding];
int intLength = strlen(objPointer);
int intCurrent;
int i = 0, j = 0, k;
unsigned char * objResult;
objResult = calloc(intLength, sizeof(char));
while ( ((intCurrent = *objPointer++) != ‘\0‘) && (intLength-- > 0) ) {
if (intCurrent == ‘=‘) {
if (*objPointer != ‘=‘ && ((i % 4) == 1)) {// || (intLength > 0)) { free(objResult);
return nil;
}
continue;
}
intCurrent = _base64DecodingTable[intCurrent];
if (intCurrent == -1) {
continue;
} elseif (intCurrent == -2) {
free(objResult);
return nil;
}
switch (i % 4) {
case0:
objResult[j] = intCurrent << 2;
break;
case1:
objResult[j++] |= intCurrent >> 4;
objResult[j] = (intCurrent & 0x0f) << 4;
break;
case2:
objResult[j++] |= intCurrent >>2;
objResult[j] = (intCurrent & 0x03) << 6;
break;
case3:
objResult[j++] |= intCurrent;
break;
}
i++;
}
k = j;
if (intCurrent == ‘=‘) {
switch (i % 4) {
case1:
free(objResult);
return nil;
case2:
k++;
case3:
objResult[k] = 0;
}
}
NSData * objData = [[NSData alloc] initWithBytes:objResult length:j] ;
free(objResult);
return objData;
}
@end
原文：http://www.cnblogs.com/zyfblog/p/3956845.html
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