Rust

openssl smime -encrypt -des3 -in <file> <pem file>

See more OpenSSL Examples

OpenSSL SMIME encrypt file using PEM containing a certificate. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Load the cert from a PEM file.

let pem = chilkat::Pem::new();
// Our particular PEM was not encrypted, so we pass an empty password.
// Also, a private key is not needed for encryption.  The PEM used to test this example
// happens to have a private key, but it's not actually used.
if pem.load_pem_file("qa_data/openssl/rsaCertAndKey.pem", "").is_err() {
    println!("{}", pem.last_error_text());
    return;
}

if pem.num_certs() == 0 {
    println!("PEM does not contain any certificates.");
    return;
}

let Ok(cert) = pem.get_cert(0) else {
    println!("{}", pem.last_error_text());
    return;
};

// -------------------------------------------------------------------------------------
// Duplicate this OpenSSL command:   openssl smime -encrypt -des3 -in <file> <pem file>
// -------------------------------------------------------------------------------------
let crypt = chilkat::Crypt2::new();
if crypt.set_encrypt_cert(&cert).is_err() {
    println!("{}", crypt.last_error_text());

    return;
}

crypt.set_crypt_algorithm("PKI");
crypt.set_pkcs7_crypt_alg("3des");
crypt.set_key_length(168);

// Load the file to be encrypted.
let bd = chilkat::BinData::new();
if bd.load_file("qa_data/openssl/hello.txt").is_err() {
    println!("Failed to load the input file.");
    return;
}

// Encrypt.
if crypt.encrypt_bd(&bd).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// The openssl smime -encrypt command produces encrypte MIME such as this:

// MIME-Version: 1.0
// Content-Disposition: attachment; filename="smime.p7m"
// Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name="smime.p7m"
// Content-Transfer-Encoding: base64
// 
// MIICzwYJKoZIhvcNAQcDoIICwDCCArwCAQAxggF8MIIBeAIBADBgMEoxCzAJBgNVBAYTAlVTMRYw
// FAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQDExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBY
// MwISA9Nqgb1dH/XTDNeKzN1nR85iMA0GCSqGSIb3DQEBAQUABIIBAIQqPexjxWovgxwKV/r3HL/U
// EP9Yozvz5hBeX5VvRZjKSi4FRw5wapElPK+4FB82hiAR9Mi3c16PvPSVkJv3l78Mv5uaaOs/OmUz
// mIHFB6Z+l2E52BDmUVWJZTQ09vdWy6+NIRlg2R9Z1NkmZ4BZCJk6mHB/Yx03IaOxK8LnwieDMthM
// SvxbhJnIOISN7k7ofs+/0vTXUpdQ+tlmwyVySMGQ6VMk+z4sqZJ2stacqCPtt/aiSwJ9p0OKmihf
// 3KDJceXJtavIQeA97yz1LqPvle35mmd5sBhV9qQYdTV/KJ+YM5uEZ9BHYbvMJbADFHwKzhcEY3qA
// 7T9acmEsb7NycOIwggE1BgkqhkiG9w0BBwEwFAYIKoZIhvcNAwcECERX/ZoHweSkgIIBEMmCMx49
// zjVAnGqRaBbvzQT1hg0uQSxIJjxMxC+HSuM+eY9oSOsbrw4uIijHKH9NdOpeDsdRzg2z5EBM7AlP
// Ht9DyPW5C2deV6RPX4F8gyExz+JUXrd+3Yb3AKTdpDkTWDmNCeO0r/YSqp518+mfU5hG8e336u51
// HAM44FeknA8oThWsD/wUB1e8vzsatK4UXW/KSu/166V7z+VT86kd+IHa7t60U9Yp0ZXgcM5Pb5Ni
// 69Qc5MKPzom2801H5UR/WjCgsxOIjOj49sKisjRy79skrJzxY5ZG05T0dKn6KC3TjRpIEEeOyhCd
// Nm2Y7dcW8GLMepdhWay5vePmQxmvmhbAtBprIem14NcrYeG6D5wP

// We have the body in bd
// Construct the header and base64 body...
let sb_encrypted_mime = chilkat::StringBuilder::new();

let _ = sb_encrypted_mime.append_line("MIME-Version: 1.0", true);
let _ = sb_encrypted_mime.append_line("Content-Disposition: attachment; filename=\"smime.p7m\"", true);
let _ = sb_encrypted_mime.append_line("Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data; name=\"smime.p7m\"", true);
let _ = sb_encrypted_mime.append_line("Content-Transfer-Encoding: base64", true);
let _ = sb_encrypted_mime.append_line("", true);
let _ = sb_encrypted_mime.append_line(&bd.get_encoded("base64_mime").unwrap_or_default(), true);

// Show the result.
println!("{}", sb_encrypted_mime.get_as_string().unwrap_or_default());

// or save to a file..
let _ = sb_encrypted_mime.write_file("qa_output/encryptedMime.txt", "utf-8", false).is_ok();