cardano::VRFSecretKey class

Represents a VRF secret key.

Derived classes

class VrfSigningKey
A VRF signing key used by stake pools to verify leadership selection.

Public static functions

static auto fromSeed(std::span<const uint8_t, VRF_SEED_SIZE> seed) →  VRFSecretKey
static auto generate() →  VRFSecretKey
static auto proofToHash(std::span<const uint8_t, VRF_PROOF_SIZE> proof) →  std::array<uint8_t, VRF_PROOF_HASH_SIZE>
Convert a VRF proof to a VRF hash.

Constructors, destructors, conversion operators

VRFSecretKey(std::span<const uint8_t, VRF_SECRET_KEY_SIZE> prv) explicit
Construct a key object from a span of key bytes.

Public functions

auto bytes() const →  const VRFKeyByteArray& constexpr
Return a constant reference to the private key secure byte array.
auto constructProof(std::span<const uint8_t> msg) →  std::array<uint8_t, VRF_PROOF_SIZE>
Construct a VRF proof from an initial message.
auto hash(std::span<const uint8_t> msg) →  std::array<uint8_t, VRF_PROOF_HASH_SIZE>
Compute the VRF hash of a message.
auto isValid() const →  bool
Ensure the key is a valid ed25519 key.
auto publicKey() const →  VRFPublicKey
Derive the public key paired with this private key.
auto sign(std::span<const uint8_t> msg) const →  std::array<uint8_t, ed25519::SIGNATURE_SIZE>
Generate a message signature from the private key.
auto verifyProof(std::span<const uint8_t> msg, std::span<const uint8_t, VRF_PROOF_SIZE> proof) const →  bool
Verify a VRF proof from the associated secret key.

Function documentation

static VRFSecretKey cardano::VRFSecretKey::fromSeed(std::span<const uint8_t, VRF_SEED_SIZE> seed)

Parameters
seed 32 byte seed.

Factory method to create a new VRF secret key from a seed.

static VRFSecretKey cardano::VRFSecretKey::generate()

Factory method to create a new VRF secret key from a cryptographically secure random number generator.

static std::array<uint8_t, VRF_PROOF_HASH_SIZE> cardano::VRFSecretKey::proofToHash(std::span<const uint8_t, VRF_PROOF_SIZE> proof)

Convert a VRF proof to a VRF hash.

Parameters
proof The VRF proof.
Returns The VRF hash.

cardano::VRFSecretKey::VRFSecretKey(std::span<const uint8_t, VRF_SECRET_KEY_SIZE> prv) explicit

Construct a key object from a span of key bytes.

Parameters
prv A span of 64 bytes that will be copied into the object. The bytes need to consist of the secret key (or seed) and the public key concatenated.

std::array<uint8_t, VRF_PROOF_SIZE> cardano::VRFSecretKey::constructProof(std::span<const uint8_t> msg)

Construct a VRF proof from an initial message.

Parameters
msg A span of bytes (uint8_t) representing the message.
Returns A vector of bytes representing the VRF proof.

std::array<uint8_t, VRF_PROOF_HASH_SIZE> cardano::VRFSecretKey::hash(std::span<const uint8_t> msg)

Compute the VRF hash of a message.

Parameters
msg The message to hash.
Returns The VRF hash.

std::array<uint8_t, ed25519::SIGNATURE_SIZE> cardano::VRFSecretKey::sign(std::span<const uint8_t> msg) const

Generate a message signature from the private key.

Parameters
msg A span of bytes (uint8_t) representing the message to sign.

bool cardano::VRFSecretKey::verifyProof(std::span<const uint8_t> msg, std::span<const uint8_t, VRF_PROOF_SIZE> proof) const

Verify a VRF proof from the associated secret key.

Parameters
msg The message from which the proof and hash were derived.
proof The proof to verify.
Returns True if the proof is valid, false otherwise.