(Lianja) RSA SHA256 Signature using Private Key from Java Keystore

Signs plaintext using RSA SHA256 using a key from a Java keystore.

Duplicatest this code:

KeyStore keystore; // key repository for keys containing signature certificate
String alias; // alias for the certificate in the key repository
String password; // password for the certificate's private key
String plaintext; // text being signed


Signature signature = Signature.getInstance("SHA256withRSA");
signature.initSign((PrivateKey) keystore.getKey(alias, password.toCharArray()));
signature.update(plaintext.getBytes("UTF-8"));
byte[] rsa_text= signature.sign();

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// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loJks = createobject("CkJavaKeyStore")

lcJksPassword = "secret"

// 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.
llSuccess = loJks.LoadFile(lcJksPassword,"qa_data/jks/sample_secret.jks")
if (llSuccess <> .T.) then
    ? loJks.LastErrorText
    release loJks
    return
endif

// Get the private key from the JKS.
// The private key password may be different than the file password.
lcPrivKeyPassword = "secret"
llCaseSensitive = .F.
loPrivKey = loJks.FindPrivateKey(lcPrivKeyPassword,"some.alias",llCaseSensitive)
if (loJks.LastMethodSuccess <> .T.) then
    ? loJks.LastErrorText
    release loJks
    return
endif

// Establish the RSA object and tell it to use the private key..
loRsa = createobject("CkRsa")

llSuccess = loRsa.ImportPrivateKeyObj(loPrivKey)
release loPrivKey
if (llSuccess <> .T.) then
    ? loRsa.LastErrorText
    release loJks
    release loRsa
    return
endif

// Indicate we'll be signing the utf-8 byte representation of the string..
loRsa.Charset = "utf-8"

// Sign some plaintext using RSA-SHA256

lcPlaintext = "this is the text to be signed"
loBinarySignature = loRsa.SignString(lcPlaintext,"SHA256")
if (loRsa.LastMethodSuccess <> .T.) then
    ? loRsa.LastErrorText
    release loJks
    release loRsa
    return
endif

// Alternatively, if the signature is desired in some encoded string form,
// such as base64, base64-url, hex, etc.
loRsa.EncodingMode = "base64-url"
lcSignatureStr = loRsa.SignStringENC(lcPlaintext,"SHA256")
? "base64-url RSA signature: " + lcSignatureStr


release loJks
release loRsa