Visual FoxPro

Create PKCS7 (CMS) EnvelopedData

Encrypt some data to a recipient by creating a PKCS7 (CMS) EnvelopedData structure. The data will be encrypted using a symmetric content-encryption algorithm (e.g., AES), and the randomly generated symmetric key will be encrypted using the recipient’s RSA public key extracted from their X.509 certificate. Visual FoxPro

LOCAL lnSuccess
LOCAL loCrypt
LOCAL loCert
LOCAL lcToBeEncrypted
LOCAL lcResult

lnSuccess = 0

loCrypt = CreateObject('Chilkat.Crypt2')

* Specify the encryption to be used.
* "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped-data) message.
loCrypt.CryptAlgorithm = "pki"
loCrypt.Pkcs7CryptAlg = "aes"
loCrypt.KeyLength = 256
loCrypt.OaepHash = "sha256"
loCrypt.OaepPadding = 1

loCert = CreateObject('Chilkat.Cert')

* Use a certificate found in the Windows certificate store.
lnSuccess = loCert.LoadByCommonName("My Certificate")
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"
loCrypt.Charset = "utf-8"

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

* -------------------------------------------------------------------------
* See the following example to decrypt what was created in this example
* Decrypt PKCS7 (CMS) EnvelopedData
* -------------------------------------------------------------------------

? lcResult

* Sample output:

* MIICSgYJKoZIhvcNAQcDoIICOzCCAjcCAQAxggHiMIIB3gIBADCBljCBgTELMAkGA1UEBhMCSVQx
* EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj
* dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH
* MwIQPCWvkSv8oQ7xRmEHJ6TzEDA8BgkqhkiG9w0BAQcwL6APMA0GCWCGSAFlAwQCAQUAoRwwGgYJ
* KoZIhvcNAQEIMA0GCWCGSAFlAwQCAQUABIIBAKqHAPQNSsQoX7B2NH7QyEOWQRsSVs8oCHXmy8f4
* MVZD2er3bvYUCIomxpwbLEAl14qjUIMynahooYGgqip7+4FqL301G+BVjZVfEhHWj+VI1dAWnWuL
* VHlvc/pbQNBWqV8rKVJsNIsuAZkdj4WSwLVKxYkYX43B8fh/g71XN2DTJu7Z/824v48KBmgpQBOT
* 2q7IcDGxNPAFN2p6eavIVGn2LvhEbf/Fszyj+GR5tMcnQP1BOLJ3s3JzUBbvj8hcZrF1Vhl9HnTU
* YQx8G/KdW1mR+Wlhl3BWoK0LYKRTbnTx2BXOs0CY1SXOAdhKr01ZYjA+xW4nGzY0lfXS9QZjh9gw
* TAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBKgQQw0xTbfmnt0zjWHo5SaQIp4AgxTVY9E/Ncqy6t+RM
* 8y4c3Av62/wB8IpPUEmtM2OeuZo=

RELEASE loCrypt
RELEASE loCert