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  • 1.  Unable to decrypt message using xslt on DataPower

    Posted Tue July 12, 2022 01:07 AM
    Hello Everyone,

    We are using aes256-cbc algorithm & It's a symmetric algorithm. We are able to encrypt message but when tried to decrypt message then we are getting below response. We are using xslt code which is configured on DataPower

    <?xml version="1.0" encoding="UTF-8"?>
    

    

    <DecryptedResponse>
    

        <DecryptedText>*NULL decryption result*</DecryptedText>
    
</DecryptedResponse>
    Please find below decryption code for the same

    <?xml version="1.0" encoding="utf-8"?>
    <xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:dp="http://www.datapower.com/extensions"
    xmlns:dpconfig="http://www.datapower.com/param/config"
    xmlns:apim="http://www.ibm.com/apimanagement"
    xmlns:webapi="http://www.ibm.com/apimanagement"
    xmlns:func="http://exslt.org/functions"
    xmlns:wxsl="http://www.w3.org/1999/XSL/TransformAlias"
    xmlns:exsl="http://exslt.org/common"
    extension-element-prefixes="dp dpconfig exsl apim"
    exclude-result-prefixes="wxsl func dp">
    <xsl:template match="/">
    <xsl:variable name="alg" select="'http://www.w3.org/2001/04/xmlenc#aes256-cbc'"/>
    <xsl:variable name="vKey" select="'name:secretkey'"/>
    <xsl:variable name="iv" select="'2F52B7EB7C17996A'"/>
    <xsl:variable name="vencryptedText" select="//*[local-name()='encryptedText']"/>
    <xsl:variable name="cipher-with-iv" select="dp:concat-base64($iv, $vencryptedText)"/>

    <xsl:variable name="vDecrypt">
    <xsl:value-of select="dp:decrypt-data($alg, $vKey, $cipher-with-iv)"/>
    </xsl:variable>
    <DecryptedResponse>
    <DecryptedText>
    <xsl:value-of select="$vDecrypt"/>
    </DecryptedText>
    </DecryptedResponse>
    </xsl:template>
    </xsl:stylesheet>

    ------------------------------
    Prashant Patel
    ------------------------------


  • 2.  RE: Unable to decrypt message using xslt on DataPower

    Posted Tue July 12, 2022 09:05 AM
    Prashant, can you post the encrypt code?   I suspect you may not need to concatenate $iv with $vencryptedText if you encrypted with DataPower.

    I suspect you have verified you're extracting the 'encryptedText' properly.

    ------------------------------
    Joseph Morgan
    ------------------------------

    Original Message


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