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Message type: E = Error
Message class: TRUST - Certificate Management
Message number: 138
Message text: DSA with SHA-256
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.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
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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- Outdated Cryptographic Libraries: If the underlying cryptographic libraries (like OpenSSL) are outdated or not configured to support SHA-256, this can lead to the error.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:
If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP Support for further assistance.
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