Zig Requires Chilkat v11.0.0+

Duplicate OpensSSL Command that Decrypts Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Zig

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

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

    // 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();

    crypt.setCryptAlgorithm("pki");

    const pem = try chilkat.Pem.init();
    defer pem.deinit();
    pem.loadPemFile("qa_data/pem/myPem.pem", "password") catch {
        std.debug.print("{s}\n", .{try pem.getLastErrorText(alloc)});
        return;
    };

    const privkey = try chilkat.PrivateKey.init();
    defer privkey.deinit();
    pem.privateKeyAt(0, privkey) catch {
        std.debug.print("{s}\n", .{try pem.getLastErrorText(alloc)});
        return;
    };

    const cert = try chilkat.Cert.init();
    defer cert.deinit();
    pem.certAt(0, cert) catch {
        std.debug.print("{s}\n", .{try pem.getLastErrorText(alloc)});
        return;
    };

    crypt.setDecryptCert2(cert, privkey) catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    crypt.ckDecryptFile("qa_data/infile.enc", "qa_output/outfile.dat") catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

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