ios加密

#import "ViewController.h"

#import <CommonCrypto/CommonCryptor.h>

#import <CommonCrypto/CommonDigest.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    //[self aesTest];

   // [self md5AndSha1Test];

    Byte by[8] = {33,2,3,4,5,6,7,8};

    NSData *data = [NSDatadataWithBytes:by length:8];

    NSString *str = [[NSStringalloc] initWithData:dataencoding:NSUTF8StringEncoding];

    NSLog(@"%@",str);

}

#pragma mark - md5 和 sha1 散列加密 不可逆

-(void)md5AndSha1Test {

    NSString *str =@"djgj的结局给大家gjggjgjfgjfjfjfjfjfjfjfjjfjfj";

    NSLog(@"%ld  %@",[[selfsha1_base64:str] length],[selfsha1:str]);

    NSLog(@"%ld  %@",[[selfmd5_base64:str] length],[selfmd5:str]);

}

//40位

- (NSString*) sha1:(NSString *)str

{

    constchar *cstr = [strcStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSDatadataWithBytes:cstr length:str.length];

    //使用对应的CC_SHA1,CC_SHA256,CC_SHA384,CC_SHA512的长度分别是20,32,48,64

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    //使用对应的CC_SHA256,CC_SHA384,CC_SHA512

    CC_SHA1(data.bytes,(CC_LONG)data.length, digest);

    NSMutableString* output = [NSMutableStringstringWithCapacity:CC_SHA1_DIGEST_LENGTH *2];

    NSLog(@"%s",digest);

    for(int i =0; i < CC_SHA1_DIGEST_LENGTH; i++)

        [output appendFormat:@"%02x", digest[i]];

    return output;

}

-(NSString *) md5:(NSString *)str

{

    const char *cStr = [strUTF8String];

    unsignedchar digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, (CC_LONG)strlen(cStr), digest );

    NSMutableString *output = [NSMutableStringstringWithCapacity:CC_MD5_DIGEST_LENGTH *2];

    for(int i =0; i < CC_MD5_DIGEST_LENGTH; i++)

        [output appendFormat:@"%02x", digest[i]];

    return output;

}

- (NSString *) sha1_base64:(NSString *)str

{

    constchar *cstr = [strcStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSDatadataWithBytes:cstr length:str.length];

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    CC_SHA1(data.bytes,(CC_LONG)data.length, digest);

    NSData * base64 = [[NSDataalloc]initWithBytes:digestlength:CC_SHA1_DIGEST_LENGTH];

    NSString *  base64Str =  [base64 base64EncodedStringWithOptions:0];;

    return base64Str;

}

- (NSString *) md5_base64:(NSString *)str

{

    const char *cStr = [strUTF8String];

    unsignedchar digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, (CC_LONG)strlen(cStr), digest );

    NSData * base64 = [[NSDataalloc]initWithBytes:digestlength:CC_MD5_DIGEST_LENGTH];

    NSString *  base64Str =  [base64 base64EncodedStringWithOptions:0];

    return base64Str;

}

#pragma mark -aes加密  对称加密

-(void)aesTest {

    NSString *str =@"djgjgjgjggjgjfgjfjfjfjfjfjfjfjjfjfjjfjffjjjfjfjfjfjfjfjfjfjfjff";

    NSData *data = [strdataUsingEncoding:NSUTF8StringEncoding];

    NSData *enData =[selfAES256ParmEncryptWithKey:@"123"Encrypttext:data];

    NSData *deData = [selfAES256ParmDecryptWithKey:@"123"Decrypttext:enData];

    NSLog(@"%@",[[NSStringalloc] initWithData:deDataencoding:NSUTF8StringEncoding]);

}

-(NSData *)AES256ParmEncryptWithKey:(NSString *)key Encrypttext:(NSData *)text //加密

{

    char keyPtr[kCCKeySizeAES256+1];

    bzero(keyPtr, sizeof(keyPtr));

    [key getCString:keyPtrmaxLength:sizeof(keyPtr)encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [text length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128;

    void *buffer = malloc(bufferSize);

    size_t numBytesEncrypted = 0;

    CCCryptorStatus cryptStatus =CCCrypt(kCCEncrypt,kCCAlgorithmAES128,

                                          kCCOptionPKCS7Padding |kCCOptionECBMode,

                                          keyPtr, kCCBlockSizeAES128,

                                          NULL,

                                          [text bytes], dataLength,

                                          buffer, bufferSize,

                                          &numBytesEncrypted);

    if (cryptStatus == kCCSuccess) {

        return [NSDatadataWithBytesNoCopy:buffer length:numBytesEncrypted];

    }

    free(buffer);

    return nil;

}

- (NSData *)AES256ParmDecryptWithKey:(NSString *)key Decrypttext:(NSData *)text //解密

{

    char keyPtr[kCCKeySizeAES256+1];

    bzero(keyPtr, sizeof(keyPtr));

    [key getCString:keyPtrmaxLength:sizeof(keyPtr)encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [text length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128;

    void *buffer = malloc(bufferSize);

    size_t numBytesDecrypted = 0;

    CCCryptorStatus cryptStatus =CCCrypt(kCCDecrypt,kCCAlgorithmAES128,

                                          kCCOptionPKCS7Padding |kCCOptionECBMode,

                                          keyPtr, kCCBlockSizeAES128,

                                          NULL,

                                          [text bytes], dataLength,

                                          buffer, bufferSize,

                                          &numBytesDecrypted);

    if (cryptStatus == kCCSuccess) {

        return [NSDatadataWithBytesNoCopy:buffer length:numBytesDecrypted];

    }

    free(buffer);

    return nil;

}