(Go) openssl enc decrypt

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

Note: This example requires Chilkat v9.5.0.71 or later.

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

    crypt := chilkat.NewCrypt2()

    // Use aes-256-cbc
    crypt.SetCryptAlgorithm("aes")
    crypt.SetCipherMode("cbc")
    crypt.SetKeyLength(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:
    crypt.SetHashAlgorithm("sha256")

    // This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
    crypt.SetHashAlgorithm("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:
    crypt.SetSecretKeyViaPassword("secret")

    // Load the file to be decrypted.
    fileData := chilkat.NewBinData()
    success := fileData.LoadFile("qa_data/openssl_enc/hamlet.enc")

    // Decrypt
    success = crypt.DecryptBd(fileData)

    // Save the decrypted output.
    success = fileData.WriteFile("qa_output/hamlet_dec.xml")

    fmt.Println("success = ", success)

    crypt.DisposeCrypt2()
    fileData.DisposeBinData()