Function: vugen_crypt_encrypt();

[SacJoshi]

Hi All,

I searched for "Password decryption without using lr_decrypt()", I found the following script:

Action()
{
    char* plaintext = "my secret password";
    char encryptedBuf[100];
    char decryptedBuf[100];
 
    lr_load_dll("C:\\Program Files\\HP\\LoadRunner\\bin\\VuGenCallback.dll");
 
    lr_output_message("plaintext: %s", plaintext);
    vugen_crypt_encrypt(plaintext, -1, encryptedBuf);
    lr_output_message("encrypted: %s", encryptedBuf);
    vugen_crypt_decrypt(encryptedBuf, decryptedBuf);
    lr_output_message("decrypted 1: %s", decryptedBuf);
    lr_output_message("decrypted 2: %s", lr_decrypt(encryptedBuf));
 
    return 0;
}

I tried using this in my script where I have parametrized the password and I am retrieving the password from a file and then using the following function to encrypt the retrieved password.

vugen_crypt_encrypt(password, -1, encryptedBuf);

I did not understand the parameter "-1" passed as an argument to the function. So, I tried replaying the script replacing -1 with different values. The results are as follow:

1) vugen_crypt_encrypt(password, 0, encryptedBuffer);

Action.c(5): Notify: Parameter Substitution: parameter "P_password" = "bean"
Action.c(10): Encrypted Password: 5805bc44e
Action.c(12): Decrypted Password 1:

2) vugen_crypt_encrypt(password, 1, encryptedBuffer);

Action.c(5): Notify: Parameter Substitution: parameter "P_password" = "bean"
Action.c(10): Encrypted Password: 5805bbdc48
Action.c(12): Decrypted Password 1: b

3) vugen_crypt_encrypt(password, 2, encryptedBuffer);

Action.c(5): Notify: Parameter Substitution: parameter "P_password" = "bean"
Action.c(10): Encrypted Password: 5805bc6a0dc5
Action.c(12): Decrypted Password 1: be

4) vugen_crypt_encrypt(password, 3, encryptedBuffer);

Action.c(5): Notify: Parameter Substitution: parameter "P_password" = "bean"
Action.c(10): Encrypted Password: 5805bcf452e2b9
Action.c(12): Decrypted Password 1: bea

5) vugen_crypt_encrypt(password, 4, encryptedBuffer);

Action.c(5): Notify: Parameter Substitution: parameter "P_password" = "bean"
Action.c(10): Encrypted Password: 5805bd2065c80caa
Action.c(12): Decrypted Password 1: bean

6) vugen_crypt_encrypt(password, 5, encryptedBuffer);

Action.c(5): Notify: Parameter Substitution: parameter "P_password" = "bean"
Action.c(10): Encrypted Password: 5805bf999db5ce92ed
Action.c(12): Decrypted Password 1: bean

It seems -1 will work for any encrypted string lenght.

What you all think? I am looking for your valuable comments.

Regards,

Sachin

[sunbruce · Accepted solution]

Hi Sachin,

The -1 means that the function will process the whole string.  (null-terminated string)

It's not recommended to use it in scripts. The 'VuGenCallback.dll' is even not included in the installation of Load Generator.

Regards,

Wei Sun

[SacJoshi]

Thanks WeI Sun!

Regards,

Sachin

[Dieu-Ai]

Hi,

In your function reference document mentions that "Vugen uses 32 bit encryption"

What encryption is using in the following methods:

- PasswordEncoder.exe

- PasswordEncoderConsole..exe

_ vugen_scrypt_encrypt()

Does vugen support encryption in the AES 256 standard?  If yes, please show me how.  This is my company requirement to encrypt any password.

Thanks.

Dieu-Ai