How To Fix WSS026 - XML Signature digest error for reference &1

SAP Error Message - Details

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 026

• Message text: XML Signature digest error for reference &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WSS026 - XML Signature digest error for reference &1 ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WSS026 XML Signature digest error for reference &1
  
  Cause:
  This error occurs during the processing of XML digital signatures in SAP Web Services Security (WS-Security). Specifically, the error indicates that the digest value of a referenced XML element does not match the expected digest value during signature verification.
  In other words:
  
  The XML signature verification fails because the digest (hash) of the referenced XML element has changed or is incorrect. This can happen due to:
  
  Modification of the XML content after it was signed.
  Incorrect canonicalization of the XML before digest calculation.
  Mismatch in the digest algorithm used.
  Problems with the XML parser or encoding issues.
  The referenced element (&1) is missing or altered.
  Issues with the security token or certificate used for signing.
  
  
  Solution:
  To resolve the WSS026 error, consider the following steps:
  
  
  Check XML Integrity:
  
  Ensure that the XML document has not been altered after signing. The signed XML must be exactly the same when verified.
  
  
  Verify Canonicalization Method:
  
  Confirm that the canonicalization method used during signing and verification is consistent. Differences here can cause digest mismatches.
  
  
  Check Digest Algorithm:
  
  Make sure the digest algorithm specified in the signature matches the one used during verification.
  
  
  Validate Reference URI:
  
  The reference URI (&1) should correctly point to the signed element. If the reference is incorrect or the element is missing, the digest check will fail.
  
  
  Encoding Issues:
  
  Check for encoding mismatches (e.g., UTF-8 vs UTF-16) that might alter the byte representation of the XML.
  
  
  Review Security Token and Certificates:
  
  Ensure that the certificates and keys used for signing and verification are valid and correctly configured.
  
  
  SAP Notes and Patches:
  
  Look for relevant SAP Notes that address WS-Security or XML signature issues. Sometimes, patches or updates fix known bugs.
  
  
  Debugging:
  
  Use SAP tools or external XML signature verification tools to debug and compare the digest values.
  
  
  
  Related Information:
  
  
  SAP WS-Security Framework:
  
  The error is related to the WS-Security implementation in SAP NetWeaver, which uses XML signatures to ensure message integrity and authenticity.
  
  
  Transaction / Tools:  
  
  Use transaction STRUST to manage certificates.  
  Use SOAP UI or other tools to inspect and verify the signed XML messages.
  
  
  
  SAP Notes:
  
  Search for notes related to WS-Security, XML signature, or error WSS026 in the SAP Support Portal.
  
  
  Documentation:
  
  Refer to SAP Help Portal sections on WS-Security and XML Signature for detailed technical background.
  
  
  
  If you provide the exact XML or scenario, I can help analyze the specific cause further.