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Adjusting padding in RSA decryption #85

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Nov 11, 2024
Merged

Adjusting padding in RSA decryption #85

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18 changes: 17 additions & 1 deletion openpgp-dsm/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1704,8 +1704,24 @@ impl Decryptor for DsmAgent {

match ciphertext {
MpiCiphertext::RSA { c } => {
let data_length = c.value().len();

// RSA Key size is not directly available, so we're estimating it based on the ciphertext size.
let target_length = match data_length {
len if len <= 256 => 256, // likely RSA-2048
len if len <= 384 => 384, // likely RSA-3072
len if len <= 512 => 512, // likely RSA-4096
len if len <= 1024 => 1024, // likely RSA-8192
_ => data_length, // Return original length if no match
};

let mut cipher = c.value().to_vec().into();
if data_length < target_length {
cipher = c.value_padded(target_length).context("Failed to adjust padding.")?.to_vec().into();
}

let decrypt_req = DecryptRequest {
cipher: c.value().to_vec().into(),
cipher: cipher,
alg: Some(Rsa),
iv: None,
key: Some(self.descriptor.clone()),
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