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How to Verify AS2 Message (SMIME) Signature With OpenSSL

Error MDNs stating an error in the lines of "Signature verification failed" or "Decryption failed" are common for users who are just getting started AS2 in any AS2 service. We, ourselves, have seen many such instances in our SaaS B2B AS2 messaging platform the AdroitLogic AS2Gateway. With these kinds of errors, sometimes, it is important for the support team and also the user itself to be able to try the decryption or signature verification manually to get more insight.

In this blog post, we will look at what the digital signature in AS2 protocol is, how to verify the signature of an AS2 message, and some tips on figuring out the cause for certain signature verification failures.

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Extracting a Private Key From the Java Keystore (JKS)

I’ve been working with the AS2 Protocol and the AdroitLogic AS2Gateway for quite some time now, and hence, playing with JKS has been a must. One of the tricks that were required from time to time was extracting the private key and public key (certificate) from Java KeyStores. In this blog post, we’ll go through a couple of simple commands on how to do that.

What Is a Java KeyStore (JKS)? 

A JKS is an encrypted security file used to store a set of cryptographic keys or certificates in the binary format, and it requires a password to be opened. JKS files are used for a variety of security purposes. They can be used to identify the author of an Android app during a build and when publishing to Android Market in Google Play or in SSL encryption.