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tomyoung1
Explorer

While doing integration with some soap/rest receiver through SAP PI/PO, they may ask to do RSA signature and Base64 encoding for some of the fields.


The soap/rest receiver should provide the private key to the sender.  When they receive any message with RSA signature by a private key, they will use their own public key to verify the private key to check if the data is sent from a legal sender.

For this kind of requirements, we can do in SAP PI/PO by using Java mapping or UDF.

In this post, I will explain how to use UDF to do RSA signature and Base64.

 

Before the mapping, the soap/rest receiver should provide the private key to SAP PO.


We are starting at the message mapping as below. (DT MT and SI creation steps are skipped)


Figure 1:message mapping


Create the UDF privateKeyEncrypt as below.


Figure 2:UDF


The code attached:


public String privateKeyEncrypt(String str, String privateKey, Container container) throws StreamTransformationException{



try {

//base64

byte[] decoded = Base64.getDecoder().decode(privateKey);

PrivateKey priKey = KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));

//RSA

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, priKey);

String outStr = Base64.getEncoder().encodeToString(cipher.doFinal(str.getBytes()));

return outStr;

} catch (Exception e) {

throw new StreamTransformationException(e.getMessage());

}

}

Use the UDF for the segment sign. The 2nd input Constant should be the private key provided by the receiver.



Figure 3: field mapping


Test:


The string abc will be encrypted and base64 to a different string as below.

Figure 4: test result


Please share your feedback or thoughts in a comment

And you can follow the SAP Process Orchestration environment Topic page (https://community.sap.com/topics/process-orchestration),
Post and answer questions about SAP Process Orchestration (https://answers.sap.com/tags/477916618626075516391832082074785),
and read other posts on the topic (https://blogs.sap.com/tags/477916618626075516391832082074785/)

For similar content, please follow my profile(tomyoung1) and I will try to post more in the future.

Thanks!
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