I found these four OIDs for RSA/MD5 algorithms that can be used in certificate encoding. Does anyone know which one(s) are used in IPsec certificates? #define szOID_RSA_MD5RSA "1.2.840.113549.1.1.4" #define szOID_OIWSEC_md5RSA "1.3.14.3.2.3" #define szOID_OIWSEC_md5RSASign "1.3.14.3.2.25" #define szOID_RSA_MD5 "1.2.840.113549.2.5" Thank you Slava Kavsan IRE