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Recipe 4.10 Converting SSL Certificates from DER to PEM
4.10.1 Problem
You have an SSL certificate in
binary
format, and you want to convert it to text-based PEM format.
4.10.2 Solution
$ openssl x509 -inform der -in filename -out filename.pem
4.10.3 Discussion
It may happen that you obtain a CA certificate in a different format.
If it appears to be a binary file (often with the filename extension
.der or .crt), it is
probably the raw DER-encoded form; test this with:
$ openssl x509 -inform der -text -in filename
DER stands for Distinguished Encoding
Rules, an encoding for ASN.1 data structures; X.509 certificates are
represented using the ASN.1 standard. The
openssl
command uses PEM encoding by default. You can convert a DER-encoded
certificate to PEM format thus:
$ openssl x509 -inform der -in filename -out filename.pem
4.10.4 See Also
openssl(1).
