How To Fix TRUST138 - DSA with SHA-256

SAP Error Message - Details

• Message type: E = Error

• Message class: TRUST - Certificate Management

• Message number: 138

• Message text: DSA with SHA-256

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message TRUST138 - DSA with SHA-256 ?

  The SAP error message TRUST138 DSA with SHA-256 typically indicates an issue related to digital signatures and the cryptographic algorithms used in the context of SAP systems. This error often arises when there is a mismatch or incompatibility in the cryptographic settings, particularly when using Digital Signature Algorithm (DSA) with SHA-256 hashing.
  Cause:
  
  Incompatible Cryptographic Settings: The error may occur if the system is trying to validate a digital signature that uses DSA with SHA-256, but the necessary cryptographic settings or libraries are not properly configured or supported in the SAP environment.
  Outdated Cryptographic Libraries: If the underlying cryptographic libraries (like OpenSSL) are outdated or not configured to support SHA-256, this can lead to the error.
  Certificate Issues: The digital certificate being used may not support DSA with SHA-256, or it may be expired or improperly configured.
  
  Solution:
  
  Update Cryptographic Libraries: Ensure that the cryptographic libraries used by your SAP system are up to date and support SHA-256. This may involve updating OpenSSL or other relevant libraries.
  Check Configuration: Review the cryptographic settings in your SAP system. Ensure that the system is configured to support DSA with SHA-256. This may involve adjusting settings in the SAP Trust Manager (transaction code STRUST).
  Review Certificates: Check the digital certificates being used. Ensure they are valid, not expired, and support the required algorithms. If necessary, obtain new certificates that support DSA with SHA-256.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error. SAP frequently releases updates and patches that may resolve known issues.
  Consult Documentation: Review SAP documentation related to digital signatures and cryptographic settings for any additional configuration steps that may be required.
  
  Related Information:
  
  SAP Trust Manager (STRUST): This transaction is used to manage SSL certificates and trust relationships in SAP systems. You can use it to import, export, and manage certificates.
  SAP Security Guides: SAP provides security guides that include best practices for configuring cryptographic settings and managing digital signatures.
  SAP Community and Support: Engaging with the SAP Community or SAP Support can provide additional insights and solutions from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP Support for further assistance.