goutils/cmd/subjhash/README

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subjhash
This tool prints the SHA-256 hash of an X.509 certificate's subject
info or issuer fields. It can also verify that the hashes of the
subject are the same between two certificates.
Usage: subjhash [-im] certs...
Flags:
-i Print hash of issuer field.
-m Matching mode. This expects arguments to be in the form of
pairs of certificates (e.g. previous, new) whose subjects
will be compared. For example,
subjhash -m ca1.pem ca1-renewed.pem \
ca2.pem ca2-renewed.pem
will exit with a non-zero status if the subject in the
ca1-renewed.pem certificate doesn't match the subject in the
ca.pem certificate; similarly for ca2.