Zig Requires Chilkat v11.0.0+

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

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 pkey = try chilkat.PrivateKey.init();
    defer pkey.deinit();

    // Load the private key from an RSA PEM file:
    try pkey.loadPemFile("myKey.pem");

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

    // Import the private key into the RSA component:
    rsa.usePrivateKey(pkey) catch {
        std.debug.print("{s}\n", .{try rsa.getLastErrorText(alloc)});
        return;
    };

    // OpenSSL uses BigEndian byte ordering:
    rsa.setLittleEndian(false);

    // The resulting signature will be a Base64 string:
    rsa.setEncodingMode("base64");

    // For simplicity, we're not loading
    // the data to be signed from a file.  We are instead simply
    // using a literal string value.
    const str_data = "This is the text to be signed.";

    // Hash the input using MD5, and then sign the hash:
    // Other valid hash algorithm choices are "md2" and "sha-1".
    const base64_sig = try rsa.signStringENC(alloc, str_data, "md5");

    std.debug.print("{s}\n", .{base64_sig});

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