How To Fix SAML2100 - Signature algorithm '&1' is out of the required hash algorithms: &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 100

• Message text: Signature algorithm '&1' is out of the required hash algorithms: &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2100 - Signature algorithm '&1' is out of the required hash algorithms: &2 ?

  The SAP error message SAML2100 indicates that there is an issue with the signature algorithm being used in a SAML (Security Assertion Markup Language) authentication process. Specifically, the error states that the signature algorithm specified (denoted as &1) is not among the required hash algorithms (denoted as &2) that are supported or expected by the system.
  Cause:
  This error typically arises due to one of the following reasons:
  
  Incompatible Signature Algorithm: The signature algorithm being used in the SAML assertion does not match the algorithms that are configured or supported in the SAP system.
  Configuration Mismatch: There may be a mismatch in the configuration settings between the Identity Provider (IdP) and the Service Provider (SP) in terms of the supported signature algorithms.
  Outdated or Unsupported Algorithms: The algorithm being used may be outdated or not considered secure by the current standards, leading to it being rejected by the SAP system.
  
  Solution:
  To resolve the SAML2100 error, you can take the following steps:
  
  
  Check Configuration:
  
  Review the SAML configuration in both the Identity Provider (IdP) and the Service Provider (SP) settings in SAP.
  Ensure that the signature algorithm used by the IdP is one of the algorithms supported by the SAP system.
  
  
  
  Update Signature Algorithm:
  
  If the IdP is using an unsupported signature algorithm, update it to one that is compatible with SAP. Commonly supported algorithms include:
  
  SHA-256
  SHA-1 (though this is becoming less common due to security concerns)
  
  
  Make sure to update the IdP configuration to use a secure and supported algorithm.
  
  
  
  Modify SAP Settings:
  
  If necessary, you can modify the SAP system settings to accept the required signature algorithm. This may involve adjusting the security settings in the SAP system to include the desired algorithms.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation for SAML configuration to ensure that you are following the recommended practices and using supported algorithms.
  
  
  
  Testing:
  
  After making the necessary changes, perform tests to ensure that the SAML authentication works correctly without triggering the error.
  
  
  
  Related Information:
  
  SAML: SAML is an XML-based framework for exchanging authentication and authorization data between parties, particularly between an IdP and an SP.
  Signature Algorithms: These algorithms are used to sign SAML assertions to ensure their integrity and authenticity. Common algorithms include RSA-SHA256, RSA-SHA1, etc.
  Security Best Practices: Always use strong and up-to-date algorithms to ensure the security of your authentication processes. Avoid using deprecated algorithms like SHA-1.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with a security expert familiar with SAML configurations in SAP environments.