CODEWITHSUNDEEP
javaencryptioncryptographyhmac3des
InterestedDev
InterestedDev

Reputation: 588

looking for a way to calculate Mac using the ISO 9797-1 Algorithm 3(Retail MAC)

Looking through Java Cryptography Architecture and code examples, I have learned how to calculate the Mac using Mac class: 

Mac mac = Mac.getInstance("HmacMD5");
mac.init(<secretKeyHere>);
byte[] macHash = mac.doFinal(<encryptedTextHere>);

But I am actually looking for a way to calculate Mac using the ISO 9797-1 Algorithm 3(Retail MAC).

Can someone suggest me a code example in Java?

Upvotes: 1

Views: 1738

Answers (2)

President James K. Polk
President James K. Polk

Reputation: 42009

It is not available in any of the Oracle providers, however if you add the Bouncycastle provider then that mac algorithm will be available, e.g. 

Security.addProvider(new BouncyCastleProvider()); 
Mac mac = Mac.getInstance("ISO9797ALG3MAC");

Note: that Mac algorithm has been obsolete for decades.

Upvotes: 4

Andy
Andy

Reputation: 14194

I believe you want to look at javacard.security.Signature.getInstance(Signature.ALG_DES_MAC4_ISO9797_1_M2_ALG3) and then use the init(), update(), and sign() methods to generate that specific signature.

Upvotes: 1

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