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(Excel) Convert Java KeyStore to PKCS12 / PFX
Loads a Java keystore file and saves it as a PKCS12 / PFX. A Java keystore (JKS) can contain two types of entries: (1) trusted root certificates or (2) private keys + cert chains. Usually a JKS will contain all entries of one type or another (and thus a particular JKS serves one purpose or another; meaning that a JKS containing trusted roots is used as a source for verifying pre-trusted roots, and a JKS containing private keys (and cert chains) is used as a secure, encrypted store for private keys).
A PKCS12 / PFX typically contains one or more private keys, along with each private key's certificate chain. Therefore, it typically makes sense to only write the private key entries to a PKCS12 (and the associated certificate chains). If a JKS contains trusted root certificates, it makes more sense to conver it to a PEM file (such as the CA cert bundle in PEM format from mozilla.org).
' This requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim jks As Chilkat.JavaKeyStore Set jks = Chilkat.NewJavaKeyStore Dim jksPassword As String jksPassword = "myJksPassword" ' Load the Java keystore from a file. The JKS file password is used ' to verify the keyed digest that is found at the very end of the keystore. ' It verifies that the keystore has not been modified. Dim success As Boolean success = jks.LoadFile(jksPassword,"/someDir/keyStore.jks") If (success <> True) Then Debug.Print jks.LastErrorText Exit Sub End If ' To convert, we'll access the private key entries ' from the JKS, add each to the PKCS12, and then save the PKCS12. Dim pkcs12 As Chilkat.Pfx Set pkcs12 = Chilkat.NewPfx Dim numPrivateKeys As Long numPrivateKeys = jks.NumPrivateKeys Dim i As Long Dim privKey As Chilkat.PrivateKey Dim certChain As Chilkat.CertChain ' For each private key entry, get the private key and ' the associated certificate chain. ' Each private key is password protected. Usually it is the same ' password as used for the keyed digest of the entire JKS. ' However, this does not have to be. The password is passed ' here to handle the possibility of each private key requiring ' a different password. i = 0 Do While i < numPrivateKeys Set privKey = jks.GetPrivateKey(jksPassword,i) Debug.Print jks.GetPrivateKeyAlias(i) Set certChain = jks.GetCertChain(i) ' Add the private key and it's associated certificate chain to the PKCS12. success = pkcs12.AddPrivateKey(privKey,certChain) If (success <> True) Then Debug.Print pkcs12.LastErrorText Exit Sub End If i = i + 1 Loop ' Save the PKCS12 / PFX to a file. ' The password can be the same as the JKS password, or something new. ' (With the PKCS12 format, there is a single password for the entire contents ' of the file. With the JKS format, there is flexibility in allowing each private key ' to have it's own password.) Dim pkcs12Password As String pkcs12Password = "myNewPassword" success = pkcs12.ToFile(pkcs12Password,"/pkcs12_files/myPfx.p12") If (success <> True) Then Debug.Print pkcs12.LastErrorText Else Debug.Print "Successfully saved to PKCS12 format." End If
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