Root OID Help

Question

Hello,

Dim EKU As X509EnhancedKeyUsageExtension = TryCast(MyCertificate.Extensions("2.5.29.37"), X509EnhancedKeyUsageExtension)

vs

Dim EKU As X509EnhancedKeyUsageExtension = TryCast(MyCertificate.Extensions("2.5.29.37.0"), X509EnhancedKeyUsageExtension)

Anyone knows the difference between OID Extensions 2.5.29.37 vs 2.5.29.37.0 ?

The only difference is trailing Dot Zero

Thanks for help :)

Answer 1

Hi @Peter Volz ,

According to Reference record for OID 2.5.29.37

• OID 2.5.29.37 is the identifier for Extended Key Usage (extKeyUsage), which indicates the purposes for which the public key of the certificate can be used, in addition to or in place of the purposes indicated by the Key Usage (keyUsage) extension field.
• OID 2.5.29.37.0 is the identifier for Any Extended Key Usage (anyExtendedKeyUsage), which indicates that the public key of the certificate can be used for any purpose.
• Therefore, OID 2.5.29.37 is a general extension field, while OID 2.5.29.37.0 is a specific extended key usage value.

Best Regards.

Jiachen Li

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