(SQL Server) 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();

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @jks int
    -- Use "Chilkat_9_5_0.JavaKeyStore" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.JavaKeyStore', @jks OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @jksPassword nvarchar(4000)
    SELECT @jksPassword = '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.
    DECLARE @success int
    EXEC sp_OAMethod @jks, 'LoadFile', @success OUT, @jksPassword, 'qa_data/jks/sample_secret.jks'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @jks, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jks
        RETURN
      END

    -- Get the private key from the JKS.
    -- The private key password may be different than the file password.
    DECLARE @privKeyPassword nvarchar(4000)
    SELECT @privKeyPassword = 'secret'
    DECLARE @caseSensitive int
    SELECT @caseSensitive = 0
    DECLARE @privKey int
    EXEC sp_OAMethod @jks, 'FindPrivateKey', @privKey OUT, @privKeyPassword, 'some.alias', @caseSensitive
    EXEC sp_OAGetProperty @jks, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @jks, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jks
        RETURN
      END

    -- Establish the RSA object and tell it to use the private key..
    DECLARE @rsa int
    -- Use "Chilkat_9_5_0.Rsa" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Rsa', @rsa OUT

    EXEC sp_OAMethod @rsa, 'ImportPrivateKeyObj', @success OUT, @privKey
    EXEC @hr = sp_OADestroy @privKey

    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jks
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    -- Indicate we'll be signing the utf-8 byte representation of the string..
    EXEC sp_OASetProperty @rsa, 'Charset', 'utf-8'

    -- Sign some plaintext using RSA-SHA256

    DECLARE @plaintext nvarchar(4000)
    SELECT @plaintext = 'this is the text to be signed'
    EXEC sp_OAMethod @rsa, 'SignString', @binarySignature OUT, @plaintext, 'SHA256'
    EXEC sp_OAGetProperty @rsa, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @jks
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    -- Alternatively, if the signature is desired in some encoded string form,
    -- such as base64, base64-url, hex, etc.
    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'base64-url'
    DECLARE @signatureStr nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'SignStringENC', @signatureStr OUT, @plaintext, 'SHA256'

    PRINT 'base64-url RSA signature: ' + @signatureStr

    EXEC @hr = sp_OADestroy @jks
    EXEC @hr = sp_OADestroy @rsa


END
GO