AES(对称加密)
代码:
#import <Foundation/Foundation.h>
@interface NSString (AES)
- (NSString *)aes256_encrypt:(NSString *)key;
- (NSString *)aes256_decrypt:(NSString *)key;
- (NSString *)aes128_encrypt:(NSString *)key;
- (NSString *)aes128_decrypt:(NSString *)key;
@end
#import "NSString+AES.h"
#import <CommonCrypto/CommonCryptor.h>
@implementation NSString (AES)
- (NSString *)aes256_encrypt:(NSString *)key {
const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:self.length];
//对数据进行加密
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, kCCAlgorithmAES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCKeySizeAES256,
NULL,
[data bytes], dataLength,
buffer, bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess)
{
NSData *result = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
//base64
return [result base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}else
{
return nil;
}
}
- (NSString *)aes256_decrypt:(NSString *)key {
NSData *data = [[NSData alloc] initWithBase64EncodedData:[self dataUsingEncoding:NSASCIIStringEncoding] options:NSDataBase64DecodingIgnoreUnknownCharacters];
//对数据进行解密
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, kCCAlgorithmAES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCKeySizeAES256,
NULL,
[data bytes], dataLength,
buffer, bufferSize,
&numBytesDecrypted);
if (cryptStatus == kCCSuccess)
{
NSData* result = [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
}else
{
return nil;
}
}
- (NSString *)aes128_encrypt:(NSString *)key {
const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:self.length];
//对数据进行加密
char keyPtr[kCCKeySizeAES128+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, kCCAlgorithmAES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCKeySizeAES128,
NULL,
[data bytes], dataLength,
buffer, bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess)
{
NSData *result = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
//base64
return [result base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}else
{
return nil;
}
}
- (NSString *)aes128_decrypt:(NSString *)key {
NSData *data = [[NSData alloc] initWithBase64EncodedData:[self dataUsingEncoding:NSASCIIStringEncoding] options:NSDataBase64DecodingIgnoreUnknownCharacters];
//对数据进行解密
char keyPtr[kCCKeySizeAES128+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, kCCAlgorithmAES,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCKeySizeAES128,
NULL,
[data bytes], dataLength,
buffer, bufferSize,
&numBytesDecrypted);
if (cryptStatus == kCCSuccess)
{
NSData* result = [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
}else
{
return nil;
}
}
@end
使用:
#import "NSString+AES.h"
NSString *str = @"name=14513525132&pwd=145361313";
NSLog(@"str=%@",str);
NSString *aesStr = [str aes256_encrypt:@"key"];
NSLog(@"aseencryptstring=%@",aesStr);
NSString *newStr = [aesStr aes256_decrypt:@"key"];
NSLog(@"asedecryptStr=%@",newStr);
NSString *aes128Str = [str aes128_encrypt:@"key"];
NSLog(@"ase128encryptstring=%@",aes128Str);
NSString *new128Str = [aes128Str aes128_decrypt:@"key"];
NSLog(@"ase128decryptStr=%@",new128Str);
网友评论