Struct ed25519_zebra::VerificationKey

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pub struct VerificationKey { /* private fields */ }
Expand description

A valid Ed25519 verification key.

This is also called a public key by other implementations.

This type holds decompressed state used in signature verification; if the verification key may not be used immediately, it is probably better to use VerificationKeyBytes, which is a refinement type for [u8; 32].

§Zcash-specific consensus properties

Ed25519 checks are described in §5.4.5 of the Zcash protocol specification and in [ZIP 215]. The verification criteria for an (encoded) verification key A_bytes are:

  • A_bytes MUST be an encoding of a point A on the twisted Edwards form of Curve25519, and non-canonical encodings MUST be accepted;

Implementations§

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impl VerificationKey

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pub fn verify(&self, signature: &Signature, msg: &[u8]) -> Result<(), Error>

Verify a purported signature on the given msg.

§Zcash-specific consensus properties

Ed25519 checks are described in §5.4.5 of the Zcash protocol specification and in ZIP215. The verification criteria for an (encoded) signature (R_bytes, s_bytes) with (encoded) verification key A_bytes are:

  • A_bytes and R_bytes MUST be encodings of points A and R respectively on the twisted Edwards form of Curve25519, and non-canonical encodings MUST be accepted;

  • s_bytes MUST represent an integer s less than l, the order of the prime-order subgroup of Curve25519;

  • the verification equation [8][s]B = [8]R + [8][k]A MUST be satisfied;

  • the alternate verification equation [s]B = R + [k]A, allowed by RFC 8032, MUST NOT be used.

Trait Implementations§

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impl AsRef<[u8]> for VerificationKey

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fn as_ref(&self) -> &[u8] ⓘ

Converts this type into a shared reference of the (usually inferred) input type.
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impl Clone for VerificationKey

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fn clone(&self) -> VerificationKey

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for VerificationKey

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for VerificationKey

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fn default() -> VerificationKey

Returns the “default value” for a type. Read more
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impl<'a> From<&'a SigningKey> for VerificationKey

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fn from(sk: &'a SigningKey) -> VerificationKey

Converts to this type from the input type.
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impl From<VerificationKey> for [u8; 32]

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fn from(vk: VerificationKey) -> [u8; 32]

Converts to this type from the input type.
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impl From<VerificationKey> for VerificationKeyBytes

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fn from(vk: VerificationKey) -> VerificationKeyBytes

Converts to this type from the input type.
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impl TryFrom<&[u8]> for VerificationKey

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(slice: &[u8]) -> Result<VerificationKey, Error>

Performs the conversion.
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impl TryFrom<[u8; 32]> for VerificationKey

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(bytes: [u8; 32]) -> Result<Self, Self::Error>

Performs the conversion.
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impl TryFrom<VerificationKeyBytes> for VerificationKey

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(bytes: VerificationKeyBytes) -> Result<Self, Self::Error>

Performs the conversion.
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impl Verifier<Signature> for VerificationKey

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fn verify(&self, message: &[u8], signature: &Signature) -> Result<(), Error>

Verify a Signature object against a given VerificationKey.

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impl Copy for VerificationKey

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impl DefaultIsZeroes for VerificationKey

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