Convert DER .cer format to Base64 .CER

Question

I have exported my certificates in DER encodig (with the extension .cer). Is there a way to convert those certificates in Base-64 encoding (with the same extension)? Thanks

The extension (as all the filename) is irrelevant. It only exists to make human life easier, computers do not care, only the content of the file matters for them. "Base-64 encoding" is called PEM in the "SSL" world. — Patrick Mevzek, Nov 25 '19 at 17:39

score 13 · Answer 1 · answered Nov 21 '19 at 14:52

13

As you have the openssl tag on your question, you should use:

openssl x509 -inform der -in infile.cer -out outfile.cer

In the reverse direction:

openssl x509 -outform der -in infile.cer -out outfile.cer

answered Nov 21 '19 at 14:52

garethTheRed

4,539
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score 4 · Accepted Answer · answered Nov 21 '19 at 10:42

4

To convert from a DER to a base64, you can use certutil :

certutil -encode filename.cer newfilename.cer

And from a base64 to a DER, you can use :

certutil -decode filename.cer newfilename.cer

answered Nov 21 '19 at 10:42

perko

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Tanks for the help ;) – Warok Nov 21 '19 at 11:26
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`certutil` is not part of the OpenSSL suite of tools as far as I know. – garethTheRed Nov 21 '19 at 14:52

Convert DER .cer format to Base64 .CER

2 Answers2