看到网上有常用加密方法的总结，就转存了一下，应该对我们以后有帮助
常用的是MD5加密，这是一种单向加密，实现如下：
需要添加的类库：#import#import#import#include
MD5实现方法（16位）：
+ (NSString *)md5:(NSString *)str
{
constchar *concat_str = [strUTF8String];
unsignedchar result[CC_MD5_DIGEST_LENGTH];
CC_MD5(concat_str, (unsignedint)strlen(concat_str), result);
NSMutableString *hash = [NSMutableStringstring];
for (int i =0; i <16; i++){
[hashappendFormat:@"%02X", result[i]];
}
return [hashuppercaseString];
}
还有就是base64的加密，这个加密在别的资源网站或是技术贴里面的描述的都一样，我们都需要去下载
提供使用的相关类，GTMBase64.zip库文件包，并解压，获得GTMBase64.h,GTMBase64.m和
GTMDefines.h三个文件。
下载地址是：https://github.com/r258833095/GTMBase64
新建一个base64的类，在base64.h中天假四个函数：
+ (NSString*)encodeBase64String:(NSString*)input;
+ (NSString*)decodeBase64String:(NSString*)input;
+ (NSString*)encodeBase64Data:(NSData*)data;
+ (NSString*)decodeBase64Data:(NSData*)data;
在base64.m文件中，实现上面4个函数：
+ (NSString*)encodeBase64String:(NSString* )input {
NSData*data = [inputdataUsingEncoding:NSUTF8StringEncodingallowLossyConversion:YES];
data = [GTMBase64encodeData:data];
NSString*base64String = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding] ;
returnbase64String;
}
+ (NSString*)decodeBase64String:(NSString* )input {
NSData*data = [inputdataUsingEncoding:NSUTF8StringEncodingallowLossyConversion:YES];
data = [GTMBase64decodeData:data];
NSString*base64String = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding] ;
returnbase64String
}
+ (NSString*)encodeBase64Data:(NSData*)data {
data = [GTMBase64encodeData:data];
NSString*base64String = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding] ;
returnbase64String;
}
+ (NSString*)decodeBase64Data:(NSData*)data {
data = [GTMBase64decodeData:data];
NSString*base64String = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding] ;
returnbase64String;
}
直接调用+ (NSString*)encodeBase64String:(NSString* )input和
+ (NSString*)decodeBase64String:(NSString* )input就可以进行加解密。
常用的AES加密，详解：
h文件内容：
#import
@class NSString;
@interface NSData (Encryption)
- (NSData *)AESOverCycle:(NSString *)key; //加密
- (NSData *)AESRelaes:(NSString *)key; //解密
@end
m文件内容：
加密：
@implementation NSData (Encryption)
- (NSData *)AESOverCycle:(NSString *)key {
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;
}
解密：
- (NSData *)AESRelaes:(NSString *)key {
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;
}
@end
