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Get an EC Key in Raw Hex Format

See more ECC Examples

Demonstrates how to get the private and public key parts of an EC (ECDSA) key in lowercase hex formmat.

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

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.

    // Load an EC key from some format..
    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();

    // This loads an ECDSA key from an unencrypted PEM file (no password required).
    priv_key.loadAnyFormatFile("qa_data/ecc/openssl_ecc_privKey.pem", "") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // The key type should be "ecc" to indicate an EC key.
    std.debug.print("key type = {s}\n", .{try priv_key.getKeyType(alloc)});

    // What is the size of the private key in bits?
    std.debug.print("size in bits = {d}\n", .{priv_key.getBitLength()});

    // Get the private and public EC key parts in raw hex format:
    const sb_pub_key_hex = try chilkat.StringBuilder.init();
    defer sb_pub_key_hex.deinit();
    const priv_key_hex = try priv_key.getRawHex(alloc, sb_pub_key_hex);

    // If the private key size in bits is 256, then we should have a 32-byte key (a 64 character hex string).
    std.debug.print("private key = {s}\n", .{priv_key_hex});

    // The public key is composed of the "x" and "y" parts, and is composed like this:  04||HEX(x)||HEX(y)
    std.debug.print("public key = {s}\n", .{try sb_pub_key_hex.getAsString(alloc)});

    // Sample output:
    // key type = ecc
    // size in bits = 256
    // private key = ced36f2ba3332be439f79143d69937fc52494cd38e45243c3ea05db183919f1b
    // public key = 045b4edcd501831740895f5907feabb71587076a6314d9d5141f9f8c33a478b8ce08b8dfd2a091eb6355803d7e729876c790bc0b176f2015f3bb103813753f676a
}