RSA Sign with PKCS8 Encrypted Key

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature.

Download 32-bit Chilkat RSA ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @pkey int
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @pkey OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  Load the private key from an RSA PEM file:
    EXEC sp_OAMethod @pkey, 'LoadPkcs8EncryptedFile', NULL, 'privateKey.key', 'myPassword'

    DECLARE @success int

    DECLARE @pkeyXml nvarchar(4000)

    --  Get the private key in XML format:
    EXEC sp_OAMethod @pkey, 'GetXml', @pkeyXml OUT

    DECLARE @rsa int
    EXEC @hr = sp_OACreate 'Chilkat.Rsa', @rsa OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  Any string argument automatically begins the 30-day trial.

    EXEC sp_OAMethod @rsa, 'UnlockComponent', @success OUT, '30-day trial'
    IF @success <> 1
      BEGIN
        PRINT 'RSA component unlock failed'
        RETURN
      END

    --  Import the private key into the RSA component:
    EXEC sp_OAMethod @rsa, 'ImportPrivateKey', @success OUT, @pkeyXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    --  This example will sign a string, and receive the signature
    --  in a hex-encoded string.  Therefore, set the encoding mode
    --  to "hex":
    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'hex'

    --  If some other non-Chilkat application or web service is going to be verifying
    --  the signature, it is important to match the byte-ordering.
    --  The LittleEndian property may be set to 1
    --  for little-endian byte ordering,
    --  or 0  for big-endian byte ordering.
    --  Microsoft apps typically use little-endian, while
    --  OpenSSL and other services (such as Amazon CloudFront)
    --  use big-endian.
    EXEC sp_OASetProperty @rsa, 'LittleEndian', 0

    DECLARE @strData nvarchar(4000)

    SELECT @strData = 'This is the string to be signed.'

    --  Sign the string using the sha-1 hash algorithm.
    --  Other valid choices are "md2", "sha256", "sha384", "sha512",  and "md5".
    DECLARE @hexSig nvarchar(4000)

    EXEC sp_OAMethod @rsa, 'SignStringENC', @hexSig OUT, @strData, 'sha-1'


    PRINT @hexSig
END
GO