(SQL Server) Decrypt MIME using RSAES-OAEP with SHA256 and AES-128 content encryption

Demonstrates how to decrypt MIME what was encrypted with RSAES-OAEP with SHA256 and AES-128 content encryption.

In actuality, we don't really need to know in advance the various algorithms used to encrypt the MIME. When decrypting, the information about the algorithms required are embedded in the PCKS7 message itself, and this tells a decryptor what it should use.

Note: This example requires Chilkat v9.5.0.67 or greater.

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 @sTmp0 nvarchar(4000)
    -- This requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- We begin with this encrypted MIME:

    -- Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
    -- someHeader1: Some value 1
    -- someHeader2: Some value 2
    -- Content-Disposition: attachment; filename="smime.p7m"
    -- Content-Transfer-Encoding: base64
    -- 
    -- MIIDvAYJKoZIhvcNAQcDoIIDrTCCA6kCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
    -- CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
    -- dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
    -- oA0wCwYJYIZIAWUDBAIBBIIBAFaUL1ga1bOrdqYKcMm+FHUacBvzfBxk0fnPA0AMBdN8BvTWT3CN
    -- YuqBhjOGyq0FpYD9pVZybUuFMCVsVyIW2O62HnsOK58YaPEUUcdH2sI+yjqX9UAn0P0nVDSsVdeK
    -- W8x9kMfZg+3UP+y1q+lu7VRJO3f2C9oLQpTkc4VW4n7UOcUI0waykLCjCTL8lFDb7/J3GeuMKyhH
    -- 5riNz50kpbzqn7m2Ks9yA+QmcTdXclclGFr2vwEUFzSdT2pxh/vaUrogCxkYWbQ2eV7vZg6O4kV0
    -- aqHBqySkPTAzHKiHH8K8GVdlTuJ8350CpICa4T8w7/Ht5I7dyOPPKy4C+rVtrvcwggH+BgkqhkiG
    -- 9w0BBwEwHQYJYIZIAWUDBAECBBDTC2WNBN+z2I47/4Feu9YqgIIB0MZvl3nC/q/Wzil6HtfQTr12
    -- Q5moHY+ORzAa1P9XvX2ZUFhW530mV395mQw/A4o4ekmX9eRPEZquYzZPLT8hNeZIuNdhpcSQUmad
    -- rKnKkR0wKJ3jJ3LhOIohVBQSYs8kVDZKq6lJBIznlsurFelZoNEhyRschhteDZx5rb7fCe8c2+/O
    -- DHxaqaHCAzm/Bd7kcg6FFfuTZy3tu0PgP5IsXN4OFA3kkvwjAs4XsVS8jdIcmDNBkYieE8WmJOIm
    -- Mz7mh/CHWLgWfGKa0Dkb9RcbFgLwYNT3GzuXFw9XPbKkEZjEAtJajWbN6P0WQl96YYd9qZxUpGxZ
    -- zjTHEYzViUdUXolfpLufttrRXyxN1RFWhNFMFbv66xYqklMSgpdM/Mbk+EuvX6eXayDPvDBpfYMw
    -- NoRAzv1Ony2c0ez9rBemJICicxAzpuvHbRxdjYs63Dnv+TYgpBK12AxWWpPIjXvw0WQKgTC3Tg8s
    -- EnuGhpENqso/clJBEBSn4+2WhYtYbdI5sVme67lvqQl1Xxy3r18SWaQbyDOwgYi1E+54lMDOxMy0
    -- y0FPHk5pP45DnXWj+XORPp5LhuZr5mf62YOXSSUwR5P0cXy4Rc+pN5lhRQPCf5z2

    DECLARE @success int

    DECLARE @sb int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sb OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @bCrlf int
    SELECT @bCrlf = 1
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'someHeader1: Some value 1', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'someHeader2: Some value 2', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'Content-Disposition: attachment; filename="smime.p7m"', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'Content-Transfer-Encoding: base64', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, '', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'MIIDvAYJKoZIhvcNAQcDoIIDrTCCA6kCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'oA0wCwYJYIZIAWUDBAIBBIIBAFaUL1ga1bOrdqYKcMm+FHUacBvzfBxk0fnPA0AMBdN8BvTWT3CN', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'YuqBhjOGyq0FpYD9pVZybUuFMCVsVyIW2O62HnsOK58YaPEUUcdH2sI+yjqX9UAn0P0nVDSsVdeK', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'W8x9kMfZg+3UP+y1q+lu7VRJO3f2C9oLQpTkc4VW4n7UOcUI0waykLCjCTL8lFDb7/J3GeuMKyhH', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, '5riNz50kpbzqn7m2Ks9yA+QmcTdXclclGFr2vwEUFzSdT2pxh/vaUrogCxkYWbQ2eV7vZg6O4kV0', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'aqHBqySkPTAzHKiHH8K8GVdlTuJ8350CpICa4T8w7/Ht5I7dyOPPKy4C+rVtrvcwggH+BgkqhkiG', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, '9w0BBwEwHQYJYIZIAWUDBAECBBDTC2WNBN+z2I47/4Feu9YqgIIB0MZvl3nC/q/Wzil6HtfQTr12', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'Q5moHY+ORzAa1P9XvX2ZUFhW530mV395mQw/A4o4ekmX9eRPEZquYzZPLT8hNeZIuNdhpcSQUmad', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'rKnKkR0wKJ3jJ3LhOIohVBQSYs8kVDZKq6lJBIznlsurFelZoNEhyRschhteDZx5rb7fCe8c2+/O', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'DHxaqaHCAzm/Bd7kcg6FFfuTZy3tu0PgP5IsXN4OFA3kkvwjAs4XsVS8jdIcmDNBkYieE8WmJOIm', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'Mz7mh/CHWLgWfGKa0Dkb9RcbFgLwYNT3GzuXFw9XPbKkEZjEAtJajWbN6P0WQl96YYd9qZxUpGxZ', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'zjTHEYzViUdUXolfpLufttrRXyxN1RFWhNFMFbv66xYqklMSgpdM/Mbk+EuvX6eXayDPvDBpfYMw', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'NoRAzv1Ony2c0ez9rBemJICicxAzpuvHbRxdjYs63Dnv+TYgpBK12AxWWpPIjXvw0WQKgTC3Tg8s', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'EnuGhpENqso/clJBEBSn4+2WhYtYbdI5sVme67lvqQl1Xxy3r18SWaQbyDOwgYi1E+54lMDOxMy0', @bCrlf
    EXEC sp_OAMethod @sb, 'AppendLine', @success OUT, 'y0FPHk5pP45DnXWj+XORPp5LhuZr5mf62YOXSSUwR5P0cXy4Rc+pN5lhRQPCf5z2', @bCrlf

    -- Load the encrypted MIME into the MIME object.
    DECLARE @mime int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Mime', @mime OUT

    EXEC sp_OAMethod @mime, 'LoadMimeSb', @success OUT, @sb

    -- Provide the required cert + private key from a PFX (.pfx/.p12) file.
    EXEC sp_OAMethod @mime, 'AddPfxSourceFile', @success OUT, 'qa_data/rsaes-oaep/cert_plus_privatekey.pfx', 'PFX_PASSWORD'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sb
        EXEC @hr = sp_OADestroy @mime
        RETURN
      END

    -- Decrypt.
    EXEC sp_OAMethod @mime, 'Decrypt', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sb
        EXEC @hr = sp_OADestroy @mime
        RETURN
      END

    -- Examine the decrypted MIME.
    EXEC sp_OAMethod @mime, 'GetMime', @sTmp0 OUT
    PRINT @sTmp0

    PRINT 'Decrypt test 1 succeeded.'

    -- -----------------------------------------------------------
    -- Now let's decrypt another way..
    -- We have the same cert and private key in PEM files..

    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Cert', @cert OUT

    EXEC sp_OAMethod @cert, 'LoadFromFile', @success OUT, 'qa_data/rsaes-oaep/cert.pem'

    DECLARE @privKey int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.PrivateKey', @privKey OUT

    EXEC sp_OAMethod @privKey, 'LoadPemFile', @success OUT, 'qa_data/rsaes-oaep/privatekey.pem'

    -- Decrypt using the cert + private key
    DECLARE @mime2 int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Mime', @mime2 OUT

    EXEC sp_OAMethod @mime2, 'LoadMimeSb', @success OUT, @sb

    EXEC sp_OAMethod @mime2, 'Decrypt2', @success OUT, @cert, @privKey
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mime2, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sb
        EXEC @hr = sp_OADestroy @mime
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @mime2
        RETURN
      END

    -- Examine the decrypted MIME.
    EXEC sp_OAMethod @mime2, 'GetMime', @sTmp0 OUT
    PRINT @sTmp0

    PRINT 'Decrypt test 2 succeeded.'

    EXEC @hr = sp_OADestroy @sb
    EXEC @hr = sp_OADestroy @mime
    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @mime2


END
GO