Zig Requires Chilkat v11.0.0+

RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

See more RSA Examples

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context. Zig

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

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

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

    const rsa = try chilkat.Rsa.init();
    defer rsa.deinit();

    // First load a public key object with a public key.
    // In this case, we'll load it from a file.
    const pubkey = try chilkat.PublicKey.init();
    defer pubkey.deinit();
    pubkey.loadFromFile("qa_data/pem/rsa_public.pem") catch {
        std.debug.print("{s}\n", .{try pubkey.getLastErrorText(alloc)});
        return;
    };

    // RSA encryption is limited to small amounts of data. The limit
    // is typically a few hundred bytes and is based on the key size and
    // padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
    // encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
    const plain_text = "Time is an illusion. Lunchtime doubly so.";

    // Import the public key to be used for encrypting.
    try rsa.usePublicKey(pubkey);

    // To get OAEP padding, set the PkcsPadding property equal to false
    rsa.setPkcsPadding(false);
    rsa.setOaepHash("sha256");

    // Indicate we'll want hex output
    rsa.setEncodingMode("hex");

    // Encrypt..
    const use_private_key = false;
    const encrypted_str = try rsa.encryptStringENC(alloc, plain_text, use_private_key);
    std.debug.print("{s}\n", .{encrypted_str});

    // -------------------------------------------------
    // Now decrypt with the matching private key.
    const rsa2 = try chilkat.Rsa.init();
    defer rsa2.deinit();

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    priv_key.loadEncryptedPem("qa_data/pem/rsa_passwd.pem", "passwd") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    try rsa2.usePrivateKey(priv_key);

    // Make sure we have the same settings used for encryption.
    rsa2.setPkcsPadding(false);
    rsa2.setEncodingMode("hex");
    rsa2.setOaepHash("sha256");

    const original_str = try rsa2.decryptStringENC(alloc, encrypted_str, true);

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