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//! PKCS#1 RSA Public Keys.
use crate::{Error, Result};
use der::{
asn1::UintRef, Decode, DecodeValue, Encode, EncodeValue, Header, Length, Reader, Sequence,
Writer,
};
#[cfg(feature = "alloc")]
use der::Document;
#[cfg(feature = "pem")]
use der::pem::PemLabel;
/// PKCS#1 RSA Public Keys as defined in [RFC 8017 Appendix 1.1].
///
/// ASN.1 structure containing a serialized RSA public key:
///
/// ```text
/// RSAPublicKey ::= SEQUENCE {
/// modulus INTEGER, -- n
/// publicExponent INTEGER -- e
/// }
/// ```
///
/// [RFC 8017 Appendix 1.1]: https://datatracker.ietf.org/doc/html/rfc8017#appendix-A.1.1
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct RsaPublicKey<'a> {
/// `n`: RSA modulus
pub modulus: UintRef<'a>,
/// `e`: RSA public exponent
pub public_exponent: UintRef<'a>,
}
impl<'a> DecodeValue<'a> for RsaPublicKey<'a> {
fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> der::Result<Self> {
reader.read_nested(header.length, |reader| {
Ok(Self {
modulus: reader.decode()?,
public_exponent: reader.decode()?,
})
})
}
}
impl EncodeValue for RsaPublicKey<'_> {
fn value_len(&self) -> der::Result<Length> {
self.modulus.encoded_len()? + self.public_exponent.encoded_len()?
}
fn encode_value(&self, writer: &mut impl Writer) -> der::Result<()> {
self.modulus.encode(writer)?;
self.public_exponent.encode(writer)?;
Ok(())
}
}
impl<'a> Sequence<'a> for RsaPublicKey<'a> {}
impl<'a> TryFrom<&'a [u8]> for RsaPublicKey<'a> {
type Error = Error;
fn try_from(bytes: &'a [u8]) -> Result<Self> {
Ok(Self::from_der(bytes)?)
}
}
#[cfg(feature = "alloc")]
impl TryFrom<RsaPublicKey<'_>> for Document {
type Error = Error;
fn try_from(spki: RsaPublicKey<'_>) -> Result<Document> {
Self::try_from(&spki)
}
}
#[cfg(feature = "alloc")]
impl TryFrom<&RsaPublicKey<'_>> for Document {
type Error = Error;
fn try_from(spki: &RsaPublicKey<'_>) -> Result<Document> {
Ok(Self::encode_msg(spki)?)
}
}
#[cfg(feature = "pem")]
impl PemLabel for RsaPublicKey<'_> {
const PEM_LABEL: &'static str = "RSA PUBLIC KEY";
}
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