Rust

AES and CHACHA20 Encrypt/Decrypt Text

See more Encryption Examples

Demonstrates the use of the new EncryptSb and DecryptSb methods introduced in Chilkat v9.5.0.67 to encrypt/decrypt the contents of StringBuilder objects.

Note: This example requires Chilkat v9.5.0.67 or greater.

Rust

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

// First build a string to be encrypted
let sb = chilkat::StringBuilder::new();
let mut i = 1;
while i < 10 {
    let _ = sb.append_int(i);
    let _ = sb.append(" the quick brown fox jumped over the lazy dog.\r\n");
    i = i + 1;
}

println!("{}", sb.get_as_string().unwrap_or_default());

// The string to be encrypted looks like this:

// 1 the quick brown fox jumped over the lazy dog.
// 2 the quick brown fox jumped over the lazy dog.
// 3 the quick brown fox jumped over the lazy dog.
// 4 the quick brown fox jumped over the lazy dog.
// 5 the quick brown fox jumped over the lazy dog.
// 6 the quick brown fox jumped over the lazy dog.
// ...

let crypt = chilkat::Crypt2::new();

// Specify the encryption to be used.
// First we'll do AES-128 CBC
crypt.set_crypt_algorithm("aes");
crypt.set_cipher_mode("cbc");
crypt.set_key_length(128);

let iv_hex = "000102030405060708090A0B0C0D0E0F".to_string();
crypt.set_encoded_iv(&iv_hex, "hex");

let key_hex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F".to_string();
crypt.set_encoded_key(&key_hex, "hex");

// When EncryptSb is called, the contents of the source (sb)
// remains unmodified.  The encrypted bytes are written into bdEncrypted.
// If bdEncrypted already contained data, it is replaced with the encrypted bytes.
let bd_encrypted = chilkat::BinData::new();
if crypt.encrypt_sb(&sb, &bd_encrypted).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Examine the encrypted bytes:
println!("{}", bd_encrypted.get_encoded("base64_mime").unwrap_or_default());

// Sample encrypted data:

// 0DdNZ22ckMMJBiaKhAu3wUEfh16XW356NIUsDmNs/xwbHe/p1201OmpfzwXwKktkAefu2pckrBgC
// df+1w8lRo+KAy5n5wlAgMGM/UrsVJsp0BmDPk1vaxKrmrGpSXOVCQs1n2+0atIs5YLiOG+Va3+Mi
// EQNb4YK7bNMmvt0++irBxTiGnkx/RncfKwgkbBUpl2x7yV13MW6lapDT6Md0DKAMsTXFJYGeIdEf
// g2uxDDQzI5gUOUHTMrXQ8paD/K76KKB9Jpp/kAM9z8g/d8KUmuphA7KI64d38xsgOmcITlbhlCQ2
// PDkcU6RRzX0FUTUSMgQukhy0jkLZEjHX9poKJD+iJTOkcQUC3OqR9hKhSrvIgJN4lxdR71MheOoQ
// 2wmvRdq+agTWWh333Vmb6J6yDV79aSpnqEDrA8Ks7Xzciol0gve91+JtVJlJKjWwEzWEU8GxF7Q8
// eaWI70lsC5nTLGcbqgKu6gzkzHlHyHaE2FAQA/d5I2dvfsAYUQCza0Zdyw8mmTtHhlP2Tfxj1uPv
// H4Q7BGuKnx3SWT2CnpbX4091w7KzLAztrbFBo/Tf9w8ZpgTK9k1ryfW9/xnk6rW6iQ==

// Decrypt to restore back to the original:
let sb_original = chilkat::StringBuilder::new();
if crypt.decrypt_sb(&bd_encrypted, &sb_original).is_err() {
    println!("{}", crypt.last_error_text());
    return;
}

// Examine the original data:
println!("{}", sb_original.get_as_string().unwrap_or_default());

// ----------------------------------------------------------------------------------
// To do chacha20 encryption, just change the settings:

crypt.set_crypt_algorithm("chacha20");
crypt.set_key_length(256);
// The initial count is the initial block counter for the chacha20 algorithm.
// It can be any integer, but must be set to the same when decrypting.
crypt.set_initial_count(22);

// EncryptSb completely replaces the contents of bdEncrypted.
let _ = crypt.encrypt_sb(&sb, &bd_encrypted).is_ok();

// However.. DecryptSb appends the decrypted text to whatever may
// have already existed within sbOriginal.
let _ = crypt.decrypt_sb(&bd_encrypted, &sb_original).is_ok();

println!("----");
println!("The original data should be here twice.  Once from the AES decrypt, and again from the chacha20 decrypt.");
println!("{}", sb_original.get_as_string().unwrap_or_default());
println!("Success.");