OpenSSL "x509 -fingerprint" - Print Certificate Fingerprint

Q

How to print out MD5 and SHA-1 fingerprints of a certificate using OpenSSL "x509" command? I need to see them and validate them with the owner of the certificate.

✍: FYIcenter.com

A

Assuming you have a certificate file located at: C:\Users\fyicenter\twitter.crt, you can print out certificate fingerprints using the "x509 -fingerprint" command as shown below:

C:\Users\fyicenter>\local\openssl\openssl.exe

OpenSSL> x509 -in twitter.crt -noout -fingerprint -md5
MD5 Fingerprint=89:5B:A2:BF:DC:E4:73:DA:46:84:D5:45:6D:81:97:52

OpenSSL> x509 -in twitter.crt -noout -fingerprint -sha1
SHA1 Fingerprint=A3:3B:B5:4C:BC:57:51:3F:94:A3:C2:88:A6:4A:02:C5:F6:8D:40:57

Options used in these commands are:

"-fingerprint" - Print out a fingerprint (digest) of the certificate.
"-md5" - Use the MD5 digest algorithm to generate the fingerprint
"-sha1" - Use the SHA-1 digest algorithm to generate the fingerprint

⇒ OpenSSL "x509 -x509toreq" - Conver Certificate to CSR

⇐ OpenSSL "x509 -text" - Print Certificate Info

⇑ OpenSSL "x509" Command

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