hmac message encryption but using our own key

try { // Generate a key for the HMAC-MD5 keyed-hashing algorithm KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5"); SecretKey key = keyGen.generateKey(); // Generate a key for the HMAC-SHA1 keyed-hashing algorithm keyGen = KeyGenerator.getInstance("HmacSHA1"); key = keyGen.generateKey(); } catch (java.security.NoSuchAlgorithmException e) { } Above code would give us keys to digest a message using HMAC. Now i wanted to implement a HMAC logic in java where the key would be given by user. Any ideas?

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