1 unstable release
0.1.1 | Oct 17, 2024 |
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#1154 in Cryptography
16KB
342 lines
iso9796_rsa in Rust
Usage
Example with non-recoverable part.
Sign:
// // RSA-1024 key
// let private_key = RsaPrivateKey::read_pkcs8_pem_file("demo_pkcs8.pem")?;
pub fn iso9796_create_signature_nonrecoverable<'a>(
private_key: &RsaPrivateKey,
content: &'a [u8],
) -> eyre::Result<(&'a [u8], Vec<u8>)> {
let mut rng = rand::thread_rng();
let signing_key =
ISO9796SigningKey::<Sha1, _>::new(Cow::Borrowed(private_key), Trailer::Implicit);
let (recoverable, signature_bytes) = signing_key
.generate_signature(Some(&mut rng), content)
.wrap_err("generate_signature")?;
assert_ne!(&signature_bytes[..], content);
let non_recoverable: &[u8] = if recoverable.len() == content.len() {
&[]
} else {
&content[recoverable.len()..]
};
Ok((non_recoverable, signature_bytes))
}
pub fn iso9796_verify_signature<PK: PublicKeyParts + Clone>(
public_key: PK,
signature: &[u8],
unrecoverable: &[u8],
) -> eyre::Result<Vec<u8>> {
let signing_key = ISO9796VerifyingKey::<Sha1, PK>::new(public_key, Trailer::Implicit);
let recovered = signing_key
.verify_signature(signature, unrecoverable)
.wrap_err("verify_signature")?;
Ok(recovered)
}
Dependencies
~5MB
~97K SLoC