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HMAC-SHA256 conversion in SAP PO and then conversion into Base 64

Dear Experts,

Need help on converting an storage key into - HMAC-SHA 256 and then convert it into Base #64 in SAP PO .

I have postman project - which is doing this in JSON , i need it's equivalent way to do in SAP PO.

Below is the piece of code from Postman Project -

"// Hash it using HMAC-SHA256 and then encode using base64", "const storageKey = pm.variables.get(\"azure_storage_key\");", "const signatureBytes = crypto.HmacSHA256(signatureRaw, crypto.enc.Base64.parse(storageKey));", "const signatureEncoded = signatureBytes.toString(crypto.enc.Base64);",

Thanks

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2 Answers

  • Posted on Jun 20, 2020 at 06:47 AM

    Hi Kuldeep,

    Please try using following code to get the required result

    so for these input key="1234" and data="hello world" I get following output

    XOD+lv5JiwIfA5+KvNqMJvfzsP29ZsngUQVo33EUv+w=

    Regards

    Anupam

    static String Base64Encoding (String key,String data) throws Exception
        {
    		
        	javax.crypto.Mac sha256_HMAC = javax.crypto.Mac.getInstance("HmacSHA256");
        	javax.crypto.spec.SecretKeySpec secret_key = new javax.crypto.spec.SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
        	sha256_HMAC.init(secret_key);
        	byte[] bytes = data.getBytes(java.nio.charset.StandardCharsets.UTF_8); 
        	String base64Encoded = java.util.Base64.getEncoder().encodeToString(sha256_HMAC.doFinal(bytes)); 
        	return base64Encoded;
        	
        }
    
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  • Posted on Jul 15, 2020 at 12:28 PM

    Hi Kuldeep,

    No need to import any libraries. Please try using the code as is.

    Regards

    Anupam

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