调整加解密,修改参数 operation :kCCDecrypt / kCCEncrypt
AEC CTR模式解密
#import <CommonCrypto/CommonCrypto.h>
#import <CommonCrypto/CommonKeyDerivation.h>
#import <Security/Security.h>
+ (NSData *) AESCTRDecryptData:(NSData *)data withKey:(NSData *)key withiv:(NSData *)iv
{
// Init cryptor
CCCryptorRef cryptor = NULL;
// Create Cryptor
CCCryptorStatus createDecrypt = CCCryptorCreateWithMode(kCCDecrypt, // operation
kCCModeCTR, // mode CTR
kCCAlgorithmAES, // Algorithm
ccPKCS7Padding, // padding
iv.bytes, // can be NULL, because null is full of zeros
key.bytes, // key
key.length, // keylength
NULL, //const void *tweak
0, //size_t tweakLength,
0, //int numRounds,
kCCModeOptionCTR_BE, //CCModeOptions options,
&cryptor); //CCCryptorRef *cryptorRef
if (createDecrypt == kCCSuccess)
{
// Alloc Data Out
NSMutableData *cipherDataDecrypt = [NSMutableData dataWithLength:data.length + kCCBlockSizeAES128];
//alloc number of bytes written to data Out
size_t outLengthDecrypt;
//Update Cryptor
CCCryptorStatus updateDecrypt = CCCryptorUpdate(cryptor,
data.bytes, //const void *dataIn,
data.length, //size_t dataInLength,
cipherDataDecrypt.mutableBytes, //void *dataOut,
cipherDataDecrypt.length, // size_t dataOutAvailable,
&outLengthDecrypt); // size_t *dataOutMoved)
if (updateDecrypt == kCCSuccess)
{
//Cut Data Out with nedded length
cipherDataDecrypt.length = outLengthDecrypt;
// Data to String
// NSString* cipherFinalDecrypt = [[NSString alloc] initWithData:cipherDataDecrypt encoding:NSUTF8StringEncoding];
//Final Cryptor
CCCryptorStatus final = CCCryptorFinal(cryptor, //CCCryptorRef cryptorRef,
cipherDataDecrypt.mutableBytes, //void *dataOut,
cipherDataDecrypt.length, // size_t dataOutAvailable,
&outLengthDecrypt); // size_t *dataOutMoved)
if (final == kCCSuccess)
{
//Release Cryptor
//CCCryptorStatus release =
CCCryptorRelease(cryptor); //CCCryptorRef cryptorRef
}
return cipherDataDecrypt;
}
}
else
{
//error
NSLog(@"AESCTRDecryptData is error");
}
return nil;
}
AEC ECB模式解密
//加密算法
#import <CommonCrypto/CommonDigest.h>
#import <CommonCrypto/CommonCryptor.h>
/**
加密:先采用AES/ECB/PKCS5Padding,再采用base64-url-safe 编码
*/
+ (NSString *)encryptAES128WithContent:(NSString *)content key:(NSString *)key{
NSData *contentData = [content dataUsingEncoding:NSUTF8StringEncoding];
NSUInteger dataLength = contentData.length;
// 为结束符'\0' +1
char keyPtr[kCCKeySizeAES128+1];
memset(keyPtr,0,sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
// 密文长度 <= 明文长度 + BlockSize
size_t encryptSize = dataLength + kCCBlockSizeAES128;
void * encryptedBytes = malloc(encryptSize);
size_t actualOutSize = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
kCCAlgorithmAES128,
kCCOptionPKCS7Padding|kCCOptionECBMode, //CBC -> PKCS7Padding,ECB -> kCCOptionPKCS7Padding|kCCOptionECBMode
keyPtr,
kCCKeySizeAES128,
NULL,
contentData.bytes,
dataLength,
encryptedBytes,
encryptSize,
&actualOutSize);
if(cryptStatus ==kCCSuccess) {
NSData*data = [NSData dataWithBytesNoCopy:encryptedBytes length:actualOutSize];
NSString *base64Str = [data base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
NSMutableString *mutBase64Str = [NSMutableString stringWithString:base64Str];
mutBase64Str = (NSMutableString * )[base64Str stringByReplacingOccurrencesOfString:@"+" withString:@"-"];
mutBase64Str = (NSMutableString * )[base64Str stringByReplacingOccurrencesOfString:@"/" withString:@"_"];
mutBase64Str = (NSMutableString * )[base64Str stringByReplacingOccurrencesOfString:@"=" withString:@""];
return mutBase64Str;
}
free(encryptedBytes);
return nil;
}
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