Signature for php and java

readme.txt

The answer is in the documentation for the PHP function hash_hmac.

When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.
Pass "true" as the final argument. Hashes are binary. When turning them into strings, they are often encoded in hexadecimal. But in this case you are going to base-64 encode it, so you want the raw binary form.

from: http://stackoverflow.com/questions/11002603/base64-encode-different-between-java-and-php

Signature.java

	static String generateSignature () {
		String encoded = "";
		String type = "HmacSHA1";	
		try {
			byte[] key = ("KEY").getBytes("UTF-8");
			byte[] Sequence = ("hello").getBytes("UTF-8");
			
			Mac HMAC = Mac.getInstance(type);
			SecretKeySpec secretKey = new SecretKeySpec(key, type);

			HMAC.init(secretKey);
			byte[] Hash = HMAC.doFinal(Sequence);

			encoded = Base64.getEncoder().encodeToString(Hash);
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.out.println(encoded);
	    return encoded;
	}

Signature.php

$key = "KEY";
$sequence = "hello";
$encrypted = hash_hmac('sha1', $sequence, $key, true);
echo base64_encode($encrypted).PHP_EOL;