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javasecuritytruststore

Decode Base64 JKS Trust Store in Java

I have based 64 JKS trust store string which I'm trying to decode. When I'm using this site to decode the file I'm getting a downloadable file with the following details: enter image description here This file is working when I'm using it with -Djavax.net.ssl.trustStore=path-to-file

Now I'm trying to decode the file myself using Java and write it to a file:

byte[] decoded = Base64.getDecoder().decode(data);
FileOutputStream fos = new FileOutputStream(new File(basePath));
fos.write(decoded);

This way I'm getting not readable characters like ���� .

I also try to convert the byte array to String:

StringBuilder sbHexDump = new StringBuilder();
for (byte b : decoded) {
    sbHexDump.append(String.format("%02x", b));
}

This way I'm getting the same hexdump as I downloaded from the website, but without spaces and newlines. In both ways, I get the following error:

java.io.IOException: Invalid keystore format
    at sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:663)
    at sun.security.provider.JavaKeyStore$JKS.engineLoad(JavaKeyStore.java:56)
    at sun.security.provider.KeyStoreDelegator.engineLoad(KeyStoreDelegator.java:224)
    at sun.security.provider.JavaKeyStore$DualFormatJKS.engineLoad(JavaKeyStore.java:70)
    at java.security.KeyStore.load(KeyStore.java:1445)

I would appreciate your help

Solution

  • This way I'm getting not readable characters like ���� .

    Yes, so what? JKS is a binary format. Not all bytes are mapped to printable characters. As long as keytool can read it you're good.