Hi,
One simple and efficient method to distinguish between PEM and DER
encoding for a CRL or a certificate is to read the first byte : if it's
equal to 0x30 then this DER (this is the start of an ASN.1 Sequence) ,
otherwise it is PEM encoded.
This works ONLY if you are sure that the given file is either PEM or DER
encoded and that the encoded object is an ASN.1 Sequence.
Cheers,
--
Mounir IDRASSI
IDRIX
http://www.idrix.fr
On 6/3/2010 10:48 AM, Arunkumar Manickam wrote:
Hi,
Given a CRL file, how to detect its format. whether it is in PEM encoded
format or ASN1.
Thanks,
Arun
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