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Jul 14, 2016

Base64 Encode and Decode


Base64 is used for converting arbitrary binary data to ASCII text so, that it's become easier to transmitted the data over the network like e-mail and HTML form data.

It is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation (Source Wikipedia).

I will share, how you can achieve base64 encoding  and decoding in C#, Java and Objective-C programming Languages.

So follow below code snippet for C#.
Encode public static string Base64Encode(string plainText) { var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText); return System.Convert.ToBase64String(plainTextBytes); }
Decode public static string Base64Decode(string base64EncodedData) { var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData); return System.Text.Encoding.UTF8.GetString(base64EncodedBytes); }

For Java See below code:
Note:  Java 8 now supports BASE64 Encoding and Decoding. You can use the following classes:
  1.  java.util.Base64,
  2.  java.util.Base64.Encoder and 
  3. java.util.Base64.Decoder
Method 1 // encode with padding String encoded = Base64.getEncoder().encodeToString(someByteArray); // encode without padding String encoded = Base64.getEncoder().withoutPadding().encodeToString(someByteArray); // decode a String byte [] barr = Base64.getDecoder().decode(encoded); Method 2 import; import javax.xml.bind.DatatypeConverter; public class EncodeString64 { public static void main(String[] args) throws UnsupportedEncodingException { String str = "77+9x6s="; // encode data using BASE64 String encoded = DatatypeConverter.printBase64Binary(str.getBytes()); System.out.println("encoded value is \t" + encoded); // Decode data String decoded = new String(DatatypeConverter.parseBase64Binary(encoded)); System.out.println("decoded value is \t" + decoded); System.out.println("original value is \t" + str); } }

For Objective C:
NSString *plainString = @"foo"; Encoding NSData *plainData = [plainString dataUsingEncoding:NSUTF8StringEncoding]; NSString *base64String = [plainData base64EncodedStringWithOptions:0]; NSLog(@"%@", base64String); // Zm9v Decoding NSData *decodedData = [[NSData alloc] initWithBase64EncodedString:base64String options:0]; NSString *decodedString = [[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding]; NSLog(@"%@", decodedString); // foo

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