Java's keytool doesn't prompt for key password

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Java's keytool has a parameter called -keypass which allows you to set a (separate) password to protect your private key, in addition to the password used for the entire key store.

According to the documentation:

The value of -keypass is a password used to protect the private key of the generated key pair. If a password is not provided, then the user is prompted for it. If you press the Return key at the prompt, then the key password is set to the same password as the keystore password. The -keypass value must have at least six characters.

However, when I leave out the password in the call to this command I don't seem to get prompted at all, at least not when this is used in combination with -genkeypair to generate an RSA key pair. Instead I just get the general help page. If I use "" to force an "empty" password then it (correctly) tells me that the password should at least be 6 characters.

Is there a way to force the keytool to prompt for a key specific password instead of having to offer it on the command line according to the documentation of -genkeypair?

I've tested this against Java 11 LTS:

keytool -genkeypair -alias test1 -keyalg RSA -keysize 4096 -sigalg SHA256withRSA -keystore test.pfx -storepass test1234
        -keypass

or

keytool -genkeypair -alias test1 -keyalg RSA -keysize 4096 -sigalg SHA256withRSA -keystore test.pfx -storepass test1234
        -keypass ""

both don't seem to work; as you can see I've already moved the -keypass parameter to the end so it cannot gobble up a parameter as password.

keystore prompt keytool passwords java
1 Answers

The default keystore type for Java 11 is PKCS12, for which it is always assumed the keystore password and key password will be the same, hence you are not prompted to enter it (documentation)

If you need to use a key password to fit your requirements, you can use other keystore types like jks or jceks.

Note: If you are using jks or jceks, java will show you a warning message:

The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format

If you type:

keytool -genkeypair -keyalg RSA -keysize 2048 -keystore double.pfx -storepass Storepass -keypass Keypass

You'll get the following warning:

Warning:  Different store and key passwords not supported for PKCS12 KeyStores.

Note that the PKCS#12 key stores themselves do support multiple passwords: they have separate derivations for multiple sections (keys, certificates) and KeyBag's and such. It's just that the Java support is missing. I found this out after parsing several key stores and looking at the format.

user_39577360
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