Decryption failed: EVP_DecryptFinal_ex:bad decrypt

[Refraction0602]

Hello, I have a question about Des decryption.

snmp agent v3 Settings:
Auth Protocol: HMACMD5
Privacy Protocol: CBC-DES

snmp2 client Settings:

let security = Security::new(b"****", b"****")
        .with_auth_protocol(AuthProtocol::Md5)
        .with_auth(Auth::AuthPriv { cipher: Cipher::Des, privacy_password: b"*****".to_vec() });

An error occurred when decrypting the response data:

error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:cryptoevpevp_enc.c:612:

After I modified part of the source code, the error disappeared：

// v3.rs ->  Security -> decrypt_des
let mut crypter =
    openssl::symm::Crypter::new(cipher, openssl::symm::Mode::Decrypt, des_key, Some(&iv))?;
crypter.pad(false); // add new

Is this a problem? Or can I have other Settings that I don't know?

Thanks.

[divi255]

Good day, I'll check this modification with our equipment

[divi255]

sorry just got into this. so the first settings contain authentication but don't work and the second example is without authentication. it's strange that your equipment passed the request without the password. are you sure it requires it? if not, try security settings without authentication set