iOS之Des加密(含资源及Demo)

/*字符串加密

*参数

*plainText : 加密明文

*key        : 密钥 64位 为和后台约定的字段示例为xxxx

*/

+ (NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key

{

NSString *ciphertext = nil;

const char *textBytes = [plainText UTF8String];

NSUInteger dataLength = [plainText length];

unsigned char buffer[1024];

memset(buffer, 0, sizeof(char));

Byte iv[] = { 0x12, 0x34, 0x56, 0x78,  0x90,  0xAB,  0xCD,  0xEF };

//注:iv[] = { 0x12, 0x34, 0x56, 0x78,  0x90,  0xAB,  0xCD,  0xEF }为移动端和后台约定的字段

size_t numBytesEncrypted = 0;

CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,

kCCOptionPKCS7Padding,

[key UTF8String], kCCKeySizeDES,

iv,

textBytes, dataLength,

buffer, 1024,

&numBytesEncrypted);

if (cryptStatus == kCCSuccess) {

NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];

ciphertext = [[NSString alloc] initWithData:[GTMBase64 encodeData:data] encoding:NSUTF8StringEncoding];

}

return ciphertext;

}

//解密

+ (NSString *) decryptUseDES:(NSString*)cipherText key:(NSString*)key

{

NSData* cipherData = [GTMBase64 decodeString:cipherText];

unsigned char buffer[1024];

memset(buffer, 0, sizeof(char));

size_t numBytesDecrypted = 0;

Byte iv[] = { 0x12, 0x34, 0x56, 0x78,  0x90,  0xAB,  0xCD,  0xEF };

//注:iv[] = { 0x12, 0x34, 0x56, 0x78,  0x90,  0xAB,  0xCD,  0xEF }为移动端和后台约定的字段

CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,

kCCAlgorithmDES,

kCCOptionPKCS7Padding,

[key UTF8String],

kCCKeySizeDES,

iv,

[cipherData bytes],

[cipherData length],

buffer,

1024,

&numBytesDecrypted);

NSString* plainText = nil;

if (cryptStatus == kCCSuccess) {

NSData* data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];

plainText = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

}

return plainText;

}

GitHub地址:https://github.com/LuochuanAD/OC-DESDemo

博文地址:http://blog.csdn.net/luochuanad/article/details/68945526