-
mike S
- PowerBuilder
- Wednesday, 25 October 2023 05:26 PM UTC
I need to decrypt a password in c# that i both encrypt and decrypt in PB. It took a while to figure out and the following works.
the value to decrypt is ls_encrypted (base64 string) and the decryption key is: is_symkey
PB:
lblb_pwrdencypted = lnv_CoderObject.Base64decode( ls_encrypted )
lblb_key = blob(is_symkey, encodingansi!)
lblb_pwrd = lnv_CrypterObject.SymmetricDEcrypt(AES!, lblb_pwrdencypted, lblb_key )
ls_unencrypted = string(lblb_pwrd, EncodingANSI!)
c#:
byte[] pwdencrypted, symkey;
string ls_unencrypted
pwdencrypted = Convert.FromBase64String(ls_encrypted);
symkey = Encoding.ASCII.GetBytes(is_symkey); //ASCII = ANSI ???
using (var aes = System.Security.Cryptography.Aes.Create())
{
aes.Mode = CipherMode.ECB;
aes.Key = symkey; //aes.IV ??? PB - zero filled by default and ingnored for ECB
aes.Padding = PaddingMode.PKCS7; //PB is PKCS5 which is said to be the same as PKCS7 since it doesn't make sense otherwise for ECB?
//DefaultPadding! – (Default) Default padding scheme. DefaultPadding! means PKCSPadding! for ECB or CBC mode. Otherwise, NoPadding! for modes like CFB, OFB, and CTR.
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (MemoryStream msDecrypt = new MemoryStream(pwdencrypted))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
ls_unencrypted = srDecrypt.ReadToEnd(); // Read the decrypted bytes from the decrypting stream and place them in a string.
}
}
}
}
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