External Types

For interoperability this crate also defines a number of types and algorithm identifiers.

AEADs

The following AEADs are defined.

pub enum AeadType {
    /// AES GCM 128
    Aes128Gcm = 0x0001,

    /// AES GCM 256
    Aes256Gcm = 0x0002,

    /// ChaCha20 Poly1305
    ChaCha20Poly1305 = 0x0003,
}

An AEAD provides the following functions to get the according values for each algorithm.

• tag_size
• key_size
• nonce_size

Hashing

The following hash algorithms are defined.

pub enum HashType {
    Sha2_256 = 0x04,
    Sha2_384 = 0x05,
    Sha2_512 = 0x06,
}

An hash algorithm provides the following functions to get the according values for each algorithm.

• size

Signatures

The following signature schemes are defined.

pub enum SignatureScheme {
    /// ECDSA_SECP256R1_SHA256
    ECDSA_SECP256R1_SHA256 = 0x0403,
    /// ECDSA_SECP384R1_SHA384
    ECDSA_SECP384R1_SHA384 = 0x0503,
    /// ECDSA_SECP521R1_SHA512
    ECDSA_SECP521R1_SHA512 = 0x0603,
    /// ED25519
    ED25519 = 0x0807,
    /// ED448
    ED448 = 0x0808,
}

HPKE Types

The HPKE implementation is part of the crypto provider as well. The crate therefore defines the necessary types too.

The HPKE algorithms are defined as follows.

#[repr(u16)]
pub enum HpkeKemType {
    /// DH KEM on P256
    DhKemP256 = 0x0010,

    /// DH KEM on P384
    DhKemP384 = 0x0011,

    /// DH KEM on P521
    DhKemP521 = 0x0012,

    /// DH KEM on x25519
    DhKem25519 = 0x0020,

    /// DH KEM on x448
    DhKem448 = 0x0021,

#[repr(u16)]
pub enum HpkeKdfType {
    /// HKDF SHA 256
    HkdfSha256 = 0x0001,

    /// HKDF SHA 384
    HkdfSha384 = 0x0002,

    /// HKDF SHA 512
    HkdfSha512 = 0x0003,

#[repr(u16)]
pub enum HpkeAeadType {
    /// AES GCM 128
    AesGcm128 = 0x0001,

    /// AES GCM 256
    AesGcm256 = 0x0002,

    /// ChaCha20 Poly1305
    ChaCha20Poly1305 = 0x0003,

    /// Export-only
    Export = 0xFFFF,

In addition helper structs for HpkeCiphertext and HpkeKeyPair are defined.

)]
pub struct HpkeCiphertext {
    pub kem_output: TlsByteVecU16,
    pub ciphertext: TlsByteVecU16,

#[derive(Debug, Clone)]
pub struct HpkeKeyPair {
    pub private: Vec<u8>,
    pub public: Vec<u8>,