1.NSString明文 转Base64格式
NSString ==> NSData ==> Base64
NSString *string = @"要加密的内容";
//NSString转换成NSData
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
// base64格式的字符串
NSString * stringBase64 = [data base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
//NSString *stringBase64 = [data base64Encoding]; (不建议使用)
2.Base64格式 转NSString
Base64 ==> NSData ==> NSString
NSData *data = [[NSData alloc] initWithBase64EncodedString:stringBase64 options:NSDataBase64DecodingIgnoreUnknownCharacters];
NSString *string =[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
3.NSData 转成 Char*
NSData *data;
char *testChar = [data bytes];
4.Char* 转成 NSData
byte* tempData = malloc(sizeof(byte)*16);
NSData *content=[NSData dataWithBytes:tempData length:16];
