Rust Requires Chilkat v11.0.0+

Verify an RSA Signature Against the Signed Hash

See more Apple Keychain Examples

Demonstrates how to validate an RSA Signature against the hash that was signed. Rust

let bd = chilkat::BinData::new();
for i in 0..=100 {
    let _ = bd.append_encoded("000102030405060708090A0B0C0D0E0F", "hex");
}

let sha256_base64 = bd.get_hash("sha256", "base64").unwrap_or_default();
println!("sha256 hash in base64 format: {}", sha256_base64);

let base64_rsa_sig = "AwF2BbOvL6jA5DwmMAc9n6J2Cc8PI6Rj5W079+aKJcIEtPWRzHor0Bvc3aftGM3Jbgj6SXlIC3M3RYS7UZOnfiHKFNZgbxaNT5WwsWooK42ZkC8DBZl0p7OunBUKd5SciUo+TKilioeUkriN3L1Zl9hwi3HVDVqgVo3XXskwIftSqLSFlepTLTmOWj9Y93dp8J4D9RyLtNgFQBc0WB22tyJTsuY56mLcWe1AMF3LizB9OrbwjynF2u16xWlrJdugccz795fJBUV9aQSD+8S3KeqwQhoi8RK1uhD68aGCyaSpBq0NZ8COAkn7MXaF4POxrAAt8udfHM+PRfSOptcH/w==".to_string();

// Get the public key to be used for signature verification.
let pub_key = chilkat::PublicKey::new();
if pub_key.load_from_file("rsaKeys/chilkat-rsa-2048.pem").is_err() {
    println!("{}", pub_key.last_error_text());
    return;
}

let rsa = chilkat::Rsa::new();
if rsa.use_public_key(&pub_key).is_err() {
    println!("{}", rsa.last_error_text());
    return;
}

// Verify the hash against the signature.
rsa.set_encoding_mode("base64");

if rsa.verify_hash_enc(&sha256_base64, "sha256", &base64_rsa_sig).is_err() {
    println!("{}", rsa.last_error_text());
    println!("Signature invalid.");
} else {
    println!("Signature valid.");
}