anchor.diff:      {Ssh, list_to_binary(Decompressed)}.
   
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  +%%
   %% MAC calculation
  -%%
  -%%     hmac-sha1    REQUIRED        HMAC-SHA1 (digest length = key
  -%%                                  length = 20)
  -%%     hmac-sha1-96 RECOMMENDED     first 96 bits of HMAC-SHA1 (digest
  -%%                                  length = 12, key length = 20)
  -%%     hmac-md5     OPTIONAL        HMAC-MD5 (digest length = key
  -%%                                  length = 16)
  -%%     hmac-md5-96  OPTIONAL        first 96 bits of HMAC-MD5 (digest
  -%%                                  length = 12, key length = 16)
  -%%     none         OPTIONAL        no MAC; NOT RECOMMENDED
   %%
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   
  
positive.code:       [
         {'ecdh-sha2-nistp256',                   [{public_keys,ecdh}, {ec_curve,secp256r1}, {hashs,sha256}]},
         {'ecdh-sha2-nistp384',                   [{public_keys,ecdh}, {ec_curve,secp384r1}, {hashs,sha384}]},
         {'ecdh-sha2-nistp521',                   [{public_keys,ecdh}, {ec_curve,secp521r1}, {hashs,sha512}]},
         {'diffie-hellman-group14-sha1',          [{public_keys,dh}, {hashs,sha}]},
         {'diffie-hellman-group-exchange-sha256', [{public_keys,dh}, {hashs,sha256}]},
         {'diffie-hellman-group-exchange-sha1',   [{public_keys,dh}, {hashs,sha}]},
         {'diffie-hellman-group1-sha1',           [{public_keys,dh}, {hashs,sha}]}
        ]);
  supported_algorithms(public_key) ->
      ssh_auth:default_public_key_algorithms();
  supported_algorithms(cipher) ->
      same(
        select_crypto_supported(
  	[{'aes128-ctr', [{ciphers,aes_ctr}]},
  	 {'aes128-cbc', [{ciphers,aes_cbc128}]},
  	 {'3des-cbc',   [{ciphers,des3_cbc}]}
  	]
  
negative.code: verify(PlainText, Hash, Sig, Key) ->
      public_key:verify(PlainText, Hash, Sig, Key).
  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %%
  %% Encryption
  %%  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
  