Visual FoxPro

openssl enc decrypt

See more Encryption Examples

Demonstrates how to decrypt a file that was encrypted using "openssl enc".

This example shows how to decrypt what was created using this openssl command:

openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt

This example shows how to do this:

openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt

Visual FoxPro

LOCAL lnSuccess
LOCAL loCrypt
LOCAL loFileData

lnSuccess = 0

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

loCrypt = CreateObject('Chilkat.Crypt2')

* Use aes-256-cbc
loCrypt.CryptAlgorithm = "aes"
loCrypt.CipherMode = "cbc"
loCrypt.KeyLength = 256

* We'll need to set the hash algorithm to either MD5 or SHA256.
* openssl version 1.0.* or earlier used MD5 by default
* openssl version 1.1.* uses SHA-256 for the password to secret key derivation.

* For example, if openssl 1.1.0 was used, we should do this:
loCrypt.HashAlgorithm = "sha256"

* This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
loCrypt.HashAlgorithm = "md5"

* The openssl command we are duplicating is:
* 
*    openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt
* 
* The file secret.txt contains the word "secret".  We could write code to load the contents
* of secret.txt, but instead we'll just do this:
loCrypt.SetEncodedKey("secret","openssl")

* Load the file to be decrypted.
loFileData = CreateObject('Chilkat.BinData')
lnSuccess = loFileData.LoadFile("qa_data/openssl_enc/hamlet.enc")

* Decrypt
loCrypt.VerboseLogging = 1
lnSuccess = loCrypt.DecryptBd(loFileData)
? loCrypt.LastErrorText

* Save the decrypted output.
lnSuccess = loFileData.WriteFile("c:/temp/qa_output/hamlet_dec.xml")

? "success = " + STR(lnSuccess)

RELEASE loCrypt
RELEASE loFileData