Zig

Load RSA Public Key from Hex Modulus and Exponent

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Load an RSA public key from a hex modulus and exponent. Zig

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

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

    // Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..
    const modulus = "BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429";

    const exponent = "00000003";

    // We'll need to re-encode from hex to base64..
    const bd_modulus = try chilkat.BinData.init();
    defer bd_modulus.deinit();
    bd_modulus.appendEncoded(modulus, "hex") catch {};
    const bd_exponent = try chilkat.BinData.init();
    defer bd_exponent.deinit();
    bd_exponent.appendEncoded(exponent, "hex") catch {};

    const xml = try chilkat.Xml.init();
    defer xml.deinit();
    xml.setTag("RsaKeyValue");
    xml.newChild2("Modulus", try bd_modulus.getEncoded(alloc, "base64"));
    xml.newChild2("Exponent", try bd_exponent.getEncoded(alloc, "base64"));

    // Now load into the pubkey object..
    const pubkey = try chilkat.PublicKey.init();
    defer pubkey.deinit();
    pubkey.loadFromString(try xml.getXml(alloc)) catch {
        std.debug.print("{s}\n", .{try pubkey.getLastErrorText(alloc)});
        return;
    };

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