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Linux Security Cookbook
book

Linux Security Cookbook

by Daniel J. Barrett, Richard E. Silverman, Robert G. Byrnes
June 2003
Intermediate to advanced content levelIntermediate to advanced
336 pages
8h 54m
English
O'Reilly Media, Inc.
Content preview from Linux Security Cookbook

4.10. Converting SSL Certificates from DER to PEM

Problem

You have an SSL certificate in binary format, and you want to convert it to text-based PEM format.

Solution

$ openssl x509 -inform der -in filename -out filename.pem

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

See Also

openssl(1).

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Publisher Resources

ISBN: 0596003919Errata Page