KeyStore Explorer is a free GUI replacement for the Java command-line utilities keytool, jarsigner and jadtool.

Web Site: http://www.keystore-explorer.org/

Features:

• Create, load, save and convert between various KeyStore types: JKS, JCEKS, PKCS#12, BKS (V1 and V2) and UBER
• Change KeyStore and KeyStore entry passwords
• Delete or rename KeyStore entries
• Cut/copy/paste KeyStore entries
• Append certificates to key pair certificate chains
• Generate RSA, ECC and DSA key pairs with self-signed X.509 certificates
• Apply X.509 certificate extensions to generated key pairs and Certificate Signing Requests (CSRs)
• View X.509 Certificate, CRL and CRL entry X.509 V3 extensions
• Import and export keys and certificates in many formats: PKCS#12, PKCS#8, PKCS#7, DER/PEM X.509 certificate files, Microsoft PVK, SPC, PKI Path, OpenSSL
• Generate, view and sign CSRs in PKCS #10 and SPKAC formats
• Sign JAR files, J2ME MIDlet Applications files and CSRs
• Configure a CA Certs KeyStore for use with KeyStore operations

For Debian, Ubuntu & friends please use repo:

wget -O - http://v.s.cz/[email protected]|sudo apt-key add -
echo deb http://v.s.cz/ stable main > /etc/apt/sources.list.d/ease.list
aptitude update
aptitude install keystore-explorer