Why would keytool report 'NoSuchAlgorithmException; cannot support algorithm "RSA"'?

Question

I thought I would share the workaround I discovered today. It is not possible to create an RSA key in the manner I'm used to anymore....

Steps to reproduce:

Install Java Development Kit jdk-6u30-windows-x64.exe on a Windows Server 2008 R2. Include the Public JRE.
Run the JRE's bin\keytool utility with the following parameters:

keytool -genseckey -alias FOO -keystore FOO.jks -keyalg RSA -validity 1825

Expected results:

Self signed certificate creation wizard

Actual results:

NoSuchAlgorithmException; cannot support algorithm "RSA"

Workaround:

Of course I tried using lowercase "rsa" but this did not work. What worked was to use the undocumented former method "-genkey" instead of "-genseckey"

4ndrew · Accepted Answer · 2012-01-12 11:52:22Z

6

The -genkey is obsolete parameter, in jdk6 is was replaced by -genkeypair. Use -genkeypair instead of -genseckey if you want to generate RSA keypair.

answered Jan 12, 2012 at 11:52

4ndrew

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