wecanencrypt 0.1.0

Simple Rust OpenPGP library for encryption, signing, and key management (includes rpgp).
Documentation 
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use num_enum::{FromPrimitive, IntoPrimitive};

#[derive(Debug, PartialEq, Eq, Clone, Copy, FromPrimitive, IntoPrimitive)]
#[cfg_attr(test, derive(proptest_derive::Arbitrary))]
#[repr(u8)]
#[non_exhaustive]
pub enum PublicKeyAlgorithm {
    /// RSA (Encrypt and Sign)
    RSA = 1,
    /// DEPRECATED: RSA (Encrypt-Only)
    RSAEncrypt = 2,
    /// DEPRECATED: RSA (Sign-Only)
    RSASign = 3,
    /// Elgamal (Encrypt-Only)
    #[cfg_attr(test, proptest(skip))]
    ElgamalEncrypt = 16,
    /// DSA (Digital Signature Algorithm)
    DSA = 17,
    /// Elliptic Curve: RFC 9580 [formerly in RFC 6637]
    ECDH = 18,
    /// ECDSA: RFC 9580 [formerly in RFC 6637]
    ECDSA = 19,
    /// DEPRECATED: Elgamal (Encrypt and Sign)
    #[cfg_attr(test, proptest(skip))]
    Elgamal = 20,
    /// Reserved for Diffie-Hellman (X9.42, as defined for IETF-S/MIME)
    #[cfg_attr(test, proptest(skip))]
    DiffieHellman = 21,
    /// EdDSA legacy format [deprecated in RFC 9580, superseded by Ed25519 (27)]
    EdDSALegacy = 22,
    /// X25519 [RFC 9580]
    X25519 = 25,
    /// X448 [RFC 9580]
    X448 = 26,
    /// Ed25519 [RFC 9580]
    Ed25519 = 27,
    /// Ed448 [RFC 9580]
    Ed448 = 28,

    /// ML-DSA-65+Ed25519
    #[cfg(feature = "draft-pqc")]
    MlDsa65Ed25519 = 30,
    /// ML-DSA-87+Ed448
    #[cfg(feature = "draft-pqc")]
    MlDsa87Ed448 = 31,

    /// SLH-DSA-SHAKE-128s
    #[cfg(feature = "draft-pqc")]
    SlhDsaShake128s = 32,
    /// SLH-DSA-SHAKE-128f
    #[cfg(feature = "draft-pqc")]
    SlhDsaShake128f = 33,
    /// SLH-DSA-SHAKE-256s
    #[cfg(feature = "draft-pqc")]
    SlhDsaShake256s = 34,

    /// ML-KEM-768+X25519
    #[cfg(feature = "draft-pqc")]
    MlKem768X25519 = 35,
    /// ML-KEM-1024+X448
    #[cfg(feature = "draft-pqc")]
    MlKem1024X448 = 36,

    /// Private experimental range (from OpenPGP)
    #[cfg_attr(test, proptest(skip))]
    Private100 = 100,
    #[cfg_attr(test, proptest(skip))]
    Private101 = 101,
    #[cfg_attr(test, proptest(skip))]
    Private102 = 102,
    #[cfg_attr(test, proptest(skip))]
    Private103 = 103,
    #[cfg_attr(test, proptest(skip))]
    Private104 = 104,
    #[cfg_attr(test, proptest(skip))]
    Private105 = 105,
    #[cfg_attr(test, proptest(skip))]
    Private106 = 106,
    #[cfg_attr(test, proptest(skip))]
    Private107 = 107,
    #[cfg_attr(test, proptest(skip))]
    Private108 = 108,
    #[cfg_attr(test, proptest(skip))]
    Private109 = 109,
    #[cfg_attr(test, proptest(skip))]
    Private110 = 110,

    #[num_enum(catch_all)]
    #[cfg_attr(test, proptest(skip))]
    Unknown(u8),
}

impl PublicKeyAlgorithm {
    /// true if the algorithm uses a post-quantum cryptographic scheme
    /// (and can thus provide post-quantum security)
    pub fn is_pqc(&self) -> bool {
        match self {
            #[cfg(feature = "draft-pqc")]
            Self::MlDsa65Ed25519
            | Self::MlDsa87Ed448
            | Self::SlhDsaShake128s
            | Self::SlhDsaShake128f
            | Self::SlhDsaShake256s
            | Self::MlKem768X25519
            | Self::MlKem1024X448 => true,

            _ => false,
        }
    }

    /// Can this algorithm sign data?
    pub fn can_sign(self) -> bool {
        use PublicKeyAlgorithm::*;

        #[cfg(feature = "draft-pqc")]
        if matches!(
            self,
            MlDsa65Ed25519 | MlDsa87Ed448 | SlhDsaShake128s | SlhDsaShake128f | SlhDsaShake256s
        ) {
            return true;
        }

        matches!(
            self,
            RSA | RSASign | Elgamal | DSA | ECDSA | EdDSALegacy | Ed25519 | Ed448
        )
    }

    /// Can this algorithm encrypt data?
    pub fn can_encrypt(self) -> bool {
        use PublicKeyAlgorithm::*;

        #[cfg(feature = "draft-pqc")]
        if matches!(self, MlKem768X25519 | MlKem1024X448) {
            return true;
        }

        matches!(
            self,
            RSA | RSAEncrypt | ECDH | DiffieHellman | Elgamal | ElgamalEncrypt | X25519 | X448
        )
    }
}