// Use Java Cryptography functions to generate the x_fp_hash value
// generate secret key for HMAC-SHA1 using the transaction
keySecretKey key = new SecretKeySpec(transactionKey.getBytes(), "HmacSHA1");
// Get instance of Mac object implementing HMAC-SHA1, and
// Initialize it with the above secret key
Mac mac = Mac.getInstance("HmacSHA1");mac.init(key);
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