iOS 数据加密

iOS 常用加密方式算法包括MD5加密、AES加密、BASE64加密

• MD5加密

MD5:全称是Message Digest Algorithm 5，译为“消息摘要算法第5版”
效果：对输入信息生成唯一的128位散列值（32个字符）\不可逆的
MD5解密网站

1. MD5加密

MD5 iOS代码加密
创建MD5类，代码如下
#import <Foundation/Foundation.h>
@interface CJMD5 : NSObject
+(NSString *)md5HexDigest:(NSString *)input;
@end
2
#import "CJMD5.h"
#import <CommonCrypto/CommonDigest.h>
@implementation CJMD5
+(NSString *)md5HexDigest:(NSString *)input{
    
    const char* str = [input UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(str, strlen(str), result);
    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH];
    
    for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) {
        [ret appendFormat:@"%02X",result];
    }
    return ret;
}
@end

2. 加盐(在指定位置插入字符)

-(NSString *)md5AddSalt:(NSString *)str withSalt:(NSString *)salt{
         str = [str stringByAppendingString:salt];
         return [NSString md5HexDigest:str];
}

3. 多次MD5

-(NSString *)moreMD5:(NSString *)str{
    NSString * md5Str = [NSString md5HexDigest:str];//一次处理
    NSString * md5Str2 = [NSString md5HexDigest:md5Str];//两次处理
    return md5Str2
}

4. 先加密, 后乱序

-(NSString *)digest4:(NSString *)str60 {61 NSString *anwen = [str md5String];
// 注册: 123 ---- 2CB962AC59075B964B07152D234B702064 
// 登录: 123 --- 202CB962AC59075B964B07152D234B7066 67 NSString *header = [anwen substringToIndex:2];
NSString *footer = [anwen substringFromIndex:2];
anwen = [footer stringByAppendingString:header];
NSLog(@"%@ - %@", str, anwen);
return anwen;73 }

• AES加密
  博客原文
• BASE64加密
  为NSString新建一个分类

#import <Foundation/Foundation.h>  
@interface NSString (Base64)    
//编码  
-(NSString *)Base64Encoded;  
+(NSString *)Base64StringWithStr:(NSString *)aSourceStr;  
 //解码  
-(NSString *)base64Decoded;  
+(NSString *)StringFromBase64Str:(NSString *)aSourceStr;  
@end  

.m文件：

#import "NSString+Base64.h"  
@implementation NSString (Base64)  
-(NSString *)Base64Encoded  
{  
    return [NSString Base64StringWithStr:self];  
}  
+(NSString *)Base64StringWithStr:(NSString *)aSourceStr  
{  
    NSData * data = [aSourceStr dataUsingEncoding:NSUTF8StringEncoding];  
    return [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];  
}  
-(NSString *)base64Decoded  
{  
    return [NSString StringFromBase64Str:self];  
}  
+(NSString *)StringFromBase64Str:(NSString *)aSourceStr  
{  
    NSData *nsdataFromBase64String = [[NSData alloc]  
                                      initWithBase64EncodedString:aSourceStr options:NSDataBase64DecodingIgnoreUnknownCharacters];  
    NSString *base64Decoded = [[NSString alloc]  
                               initWithData:nsdataFromBase64String encoding:NSUTF8StringEncoding];  
    return base64Decoded;  
}  
@end