On 19 Apr 2011, at 10:55 AM, Matt C wrote:
> Should I be hashing the entire contents of the PEM file, only part, or is 
> there additional data I need to add?

The fingerprint that openssl computes is the hash of the entire certificate in 
DER format. You should be able to recover the DER-formatted certificate by 
base64-decoding the block of text between the BEGIN/END lines in the 
PEM-formatted certifcate.

There are other hashes of various parts of the certificate, used for other 
things, but if you're trying to duplicate what openssl -fingerprint is doing, 
that's how.


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