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Ed25519 Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519 signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.83 or greater.

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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 priv_key_hex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93";
    const pub_key_hex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde";

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    // This example shows only one way of loading an Ed25519 private key.
    // Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)
    // You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
    priv_key.loadEd25519(priv_key_hex, pub_key_hex) catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // The data to be signed...
    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    bd.appendString("Message for Ed25519 signing", "utf-8") catch {};

    const eddsa = try chilkat.EdDSA.init();
    defer eddsa.deinit();
    const hex_sig = try eddsa.signBdENC(alloc, bd, "hexlower", priv_key);

    std.debug.print("signature = {s}\n", .{hex_sig});

    // The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

    // Verify the signature..
    const pub_key = try chilkat.PublicKey.init();
    defer pub_key.deinit();
    pub_key.loadEd25519(pub_key_hex) catch {
        std.debug.print("{s}\n", .{try pub_key.getLastErrorText(alloc)});
        return;
    };

    eddsa.verifyBdENC(bd, hex_sig, "hexlower", pub_key) catch {
        std.debug.print("{s}\n", .{try eddsa.getLastErrorText(alloc)});
        std.debug.print("Failed to verify the signature.\n", .{});
        return;
    };

    std.debug.print("The Ed25519 signature is verified!\n", .{});
}