Zig Requires Chilkat v11.1.0+

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

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    var success: bool = false;

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

    const crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // 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.setEncodedKey("secret", "openssl");

    // Load the file to be decrypted.
    const file_data = try chilkat.BinData.init();
    defer file_data.deinit();
    success = if (file_data.loadFile("qa_data/openssl_enc/hamlet.enc")) true else |_| false;

    // Decrypt
    crypt.setVerboseLogging(true);
    success = if (crypt.decryptBd(file_data)) true else |_| false;
    std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});

    // Save the decrypted output.
    success = if (file_data.writeFile("c:/temp/qa_output/hamlet_dec.xml")) true else |_| false;

    std.debug.print("success = {}\n", .{success});
}