25 lines
956 B
Rust
25 lines
956 B
Rust
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use openssl::symm::{Cipher, Crypter, Mode};
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use openssl::error::ErrorStack;
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use base64::{Engine as _, engine::general_purpose};
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const IV_LENGTH: usize = 16;
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const KEY: &str = "3559b435f24b297a79c68b9709ef2125";
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pub fn decrypt_packet(base64_input: &str) -> Result<String, ErrorStack> {
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let base64_buffer = general_purpose::STANDARD.decode(base64_input).unwrap();
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let decryption_iv = &base64_buffer[..IV_LENGTH];
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let ciphertext = &base64_buffer[IV_LENGTH..];
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let cipher = Cipher::aes_256_cbc();
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let mut decrypter = Crypter::new(cipher, Mode::Decrypt, KEY.as_bytes(), Some(decryption_iv))?;
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let mut decrypted_data = vec![0u8; ciphertext.len() + cipher.block_size()];
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let mut decrypted_len = decrypter.update(ciphertext, &mut decrypted_data)?;
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decrypted_len += decrypter.finalize(&mut decrypted_data[decrypted_len..])?;
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decrypted_data.truncate(decrypted_len);
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Ok(String::from_utf8(decrypted_data).unwrap())
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}
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