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Visual FoxPro Examples

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(Visual FoxPro) Encrypt/Decrypt using PFX to produce -----BEGIN PKCS7----- ... -----END PKCS7-----

First we encrypt using a certificate + public key to produce output such as:

-----BEGIN PKCS7-----
MIIHPwYJKoZIhvcNAQcEoIIHMDCCBywC ...
...
...
-----END PKCS7-----
Then we decrypt using the cert + private key.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loCrypt
LOCAL loCert
LOCAL lnSuccess
LOCAL lcToBeEncrypted
LOCAL lcEncryptedStr
LOCAL loSb
LOCAL lcOutStr
LOCAL lnBCrlf
LOCAL loDecrypt
LOCAL lcDecryptedText

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

loCrypt = CreateObject('Chilkat_9_5_0.Crypt2')

*  Specify the encryption to be used.
*  "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped) message.
loCrypt.CryptAlgorithm = "pki"
loCrypt.Pkcs7CryptAlg = "aes"
loCrypt.KeyLength = 128
loCrypt.OaepHash = "sha256"
loCrypt.OaepPadding = 1

*  A certificate is needed as the encryption key.
*  Althought the PFX contains the associated private key, we don't need it for encryption.
*  (A certificate usually contains the public key by default.)
loCert = CreateObject('Chilkat_9_5_0.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

*  Tell the crypt object to use the certificate.
loCrypt.SetEncryptCert(loCert)

lcToBeEncrypted = "This string is to be encrypted."

*  Get the result in multi-line BASE64 MIME format.
loCrypt.EncodingMode = "base64_mime"

lcEncryptedStr = loCrypt.EncryptStringENC(lcToBeEncrypted)
IF (lnSuccess <> 1) THEN
    ? loCrypt.LastErrorText
    RELEASE loCrypt
    RELEASE loCert
    CANCEL
ENDIF

*  Make a "-----BEGIN PKCS7-----" ... "-----END PKCS7-----" sandwich...
loSb = CreateObject('Chilkat_9_5_0.StringBuilder')
loSb.AppendLine("-----BEGIN PKCS7-----",1)
loSb.Append(lcEncryptedStr)
loSb.AppendLine("-----END PKCS7-----",1)

lcOutStr = loSb.GetAsString()

? lcOutStr

*  Sample output:

*  -----BEGIN PKCS7-----
*  MIICXAYJKoZIhvcNAQcDoIICTTCCAkkCAQAxggH0MIIB8AIBADCBrDCBlzELMAkGA1UEBhMCR0Ix
*  GzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgGA1UEChMR
*  Q09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhlbnRpY2F0
*  aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0ECEB6M1ZwZdZU7LrAIdurulmUwOAYJKoZIhvcNAQEHMCug
*  DzANBglghkgBZQMEAgEFAKEYMBYGCSqGSIb3DQEBCDAJBgUrDgMCGgUABIIBAK/BZG/iXJ8az7zL
*  8EQ77mc+oDPQ4w1hyytK2ip4djkPVvTfYhcoDQ+G/DBU+urJfrVBi5H9gmpXwYyfKlyUxBVRVEJl
*  V/V5QQi4JmNTFbmgWh5tp9zDS98l6A2Va4Zs0Wy/owGLfvwitlxd1dsfVAV2hmBYS24BMpNcty5/
*  0atcKYmSou13G78ztTKdMy1tECgZy8kerMsPdDQbSxEZkT3KpQ8C5uEQqYF3bIVaeZzha/Ywieh/
*  tvO0T4aAmeJufwkNdVECmU7kuhnNaVPXknFl7jeibTl6zA/VcJKBKcIYT9FRC7KjdooI8q+jtQ/V
*  k6RP4POaowkFg1QWRPEWeqIwTAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBAgQQEEFQduqeJqXQXzy4
*  JpkoDoAgdldJDB9zEkpMpgr5/fR2iLvh5kC6BPfhOYjsawBY4Ok=
*  -----END PKCS7-----

*  ----------------------------------------------------------------------------------------
*  Let's Decrypt the above string.

*  Start with what was produced above..
loSb.Clear()
lnBCrlf = 1
loSb.AppendLine("-----BEGIN PKCS7-----",lnBCrlf)
loSb.AppendLine("MIICXAYJKoZIhvcNAQcDoIICTTCCAkkCAQAxggH0MIIB8AIBADCBrDCBlzELMAkGA1UEBhMCR0Ix",lnBCrlf)
loSb.AppendLine("GzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgGA1UEChMR",lnBCrlf)
loSb.AppendLine("Q09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhlbnRpY2F0",lnBCrlf)
loSb.AppendLine("aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0ECEB6M1ZwZdZU7LrAIdurulmUwOAYJKoZIhvcNAQEHMCug",lnBCrlf)
loSb.AppendLine("DzANBglghkgBZQMEAgEFAKEYMBYGCSqGSIb3DQEBCDAJBgUrDgMCGgUABIIBAK/BZG/iXJ8az7zL",lnBCrlf)
loSb.AppendLine("8EQ77mc+oDPQ4w1hyytK2ip4djkPVvTfYhcoDQ+G/DBU+urJfrVBi5H9gmpXwYyfKlyUxBVRVEJl",lnBCrlf)
loSb.AppendLine("V/V5QQi4JmNTFbmgWh5tp9zDS98l6A2Va4Zs0Wy/owGLfvwitlxd1dsfVAV2hmBYS24BMpNcty5/",lnBCrlf)
loSb.AppendLine("0atcKYmSou13G78ztTKdMy1tECgZy8kerMsPdDQbSxEZkT3KpQ8C5uEQqYF3bIVaeZzha/Ywieh/",lnBCrlf)
loSb.AppendLine("tvO0T4aAmeJufwkNdVECmU7kuhnNaVPXknFl7jeibTl6zA/VcJKBKcIYT9FRC7KjdooI8q+jtQ/V",lnBCrlf)
loSb.AppendLine("k6RP4POaowkFg1QWRPEWeqIwTAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBAgQQEEFQduqeJqXQXzy4",lnBCrlf)
loSb.AppendLine("JpkoDoAgdldJDB9zEkpMpgr5/fR2iLvh5kC6BPfhOYjsawBY4Ok=",lnBCrlf)
loSb.AppendLine("-----END PKCS7-----",lnBCrlf)

loDecrypt = CreateObject('Chilkat_9_5_0.Crypt2')
loDecrypt.CryptAlgorithm = "pki"

*  Use the same cert + private key from the PFX above.
*  For decryption, we need the private key.  Given that the certificate was loaded from a PFX,
*  we should already have it.
lnSuccess = loDecrypt.SetDecryptCert(loCert)

loDecrypt.EncodingMode = "base64"
lcDecryptedText = loDecrypt.DecryptStringENC(loSb.GetBetween("-----BEGIN PKCS7-----","-----END PKCS7-----"))

? lcDecryptedText

RELEASE loCrypt
RELEASE loCert
RELEASE loSb
RELEASE loDecrypt


 

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