How to print the public key of a certificate using keytool?
certificate, java, keytool
Solution
You can do that With `openssl`.
If this certificate is DER-encoded (binary), use:
openssl x509 -inform der -in client.crt -pubkey -noout
for PEM-encoded use `-inform pem` option (or no `-inform` at all).
To see details of public key, use:
openssl x509 -inform der -in client.crt -pubkey -noout | openssl rsa -pubin -text -noout
Problem
Is there a way in keytool to print the publick key of a certificate? I tried: ``` keytool -printcert -file client.crt ``` But it gives only the following information: ``` Owner: CN=client, OU=as, O=as, L=as, ST=as, C=as Issuer: EMAILADDRESS=as, CN=ca, OU=as, O=as, L=as, ST=as, C=as Serial number: 3 Valid from: Tue Apr 10 12:18:47 GMT+05:30 2012 until: Wed Apr 10 12:18:47 GMT+05 :30 2013 Certificate fingerprints: MD5: 26:C0:29:E9:8C:AB:C3:9E:95:38:74:8A:87:D3:86:8D SHA1: 5C:5A:BA:47:44:83:7E:CB:48:BE:DD:E5:39:51:24:42:C6:C5:60:8B SHA256: DA:26:B8:C8:F4:04:3E:62:F3:7F:3B:EC:1D:9F:85:66:28:00:45:55:66: 15:FF:BB:37:77:97:59:F0:EC:0B:B6 Signature algorithm name: SHA1withRSA Version: 1 ``` There is no public key in this.