CODEWITHSUNDEEP
javaarduinobase64
sabrina2020
sabrina2020

Reputation: 2472

Base64 no the same result using Arduino and Java library

why I am not geting the same result after encoding a string in base64 with JAVA and arduino library

Arduino code:

char data[] = "0123456789012345";
int inputLen = sizeof(data);
char encoded[100];
base64_encode(encoded, data, inputLen);

Serial.print("encoded base 64:");
Serial.println(encoded);

Arduino code result

encoded base 64:MDEyMzQ1Njc4OTAxMjM0NQA=

Java code:

static String message= "0123456789012345";
/////
String encoded = DatatypeConverter.printBase64Binary(message.getBytes());
System.out.println("encoded value is \t" + encoded);

Java code result:

encoded value is    MDEyMzQ1Njc4OTAxMjM0NQ==

Why is the arduino library adding extra data at the end?

Thanks!

Upvotes: 0

Views: 510

Answers (1)

frarugi87
frarugi87

Reputation: 2880

Because strings are null-terminated. Consequently, when you write

char data[] = "0123456789012345";

you allocate a 17-bytes string, with an hex content of 

0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x30 0x31 0x32 0x33 0x34 0x35 0x00

The function is adding also the terminal byte in the base64 encoding. If you want to discard it, change your line to

int inputLen = sizeof(data) - 1;

Upvotes: 1

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