国密算法SM4的OC封装
pod 'TTSM4', '~> 1.0.0'
1.CBC模式：需要密钥和初始化向量来初始化，且长度都为16字节
NSString *secretKey = @"JeF8U9wHFOMfs2Y8";//密钥
NSString *iv = @"UISwD9fW6cFh9SNS";//初始化向量
TTAlgorithmSM4 *sm4 = [TTAlgorithmSM4 cbcSM4WithKey:secretKey iv:iv];
//原始数据
NSDictionary *msgDic = @{@"name":@"TTwong", @"country":@"**"};
NSError *error;
NSData *msgData = [NSJSONSerialization dataWithJSONObject:msgDic options:0 error:&error];
//原始字符串
NSString *msgString = [[NSString alloc]initWithData:msgData encoding:NSUTF8StringEncoding];
//加密后的字符串
NSString *encryptionString = [sm4 encryption:msgString];
//解密后的字符串
NSString *decryptionString = [sm4 decryption:encryptionString];
//恢复到原始数据
NSMutableData *msgdata = [[NSMutableData alloc]initWithData:[decryptionString dataUsingEncoding:NSUTF8StringEncoding]];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:msgdata options:NSJSONReadingMutableLeaves error:&error];
2.ECB模式：需要密钥来初始化，密钥长度为16字节
NSString *secretKey = @"JeF8U9wHFOMfs2Y8";//密钥
TTAlgorithmSM4 *sm4 = [TTAlgorithmSM4 ecbSM4WithKey:secretKey];
//原始数据
NSDictionary *msgDic = @{@"name":@"TTwong", @"country":@"**"};
NSError *error;
NSData *msgData = [NSJSONSerialization dataWithJSONObject:msgDic options:0 error:&error];
NSString *msgString = [[NSString alloc]initWithData:msgData encoding:NSUTF8StringEncoding];
//加密后的字符串
NSString *encryptionString = [sm4 encryption:msgString];
//解密后的字符串
NSString *decryptionString = [sm4 decryption:encryptionString];
//恢复到原始数据
NSMutableData *msgdata = [[NSMutableData alloc]initWithData:[decryptionString dataUsingEncoding:NSUTF8StringEncoding]];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:msgdata options:NSJSONReadingMutableLeaves error:&error];
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