ExpandedSecretKey

ed25519_dalek::hazmat

Struct ExpandedSecretKey 

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pub struct ExpandedSecretKey {
    pub scalar: Scalar,
    pub hash_prefix: [u8; 32],
}
Available on crate feature hazmat only.
Expand description

Contains the secret scalar and domain separator used for generating signatures.

This is used internally for signing.

In the usual Ed25519 signing algorithm, scalar and hash_prefix are defined such that scalar || hash_prefix = H(sk) where sk is the signing key and H is SHA-512. WARNING: Deriving the values for these fields in any other way can lead to full key recovery, as documented in raw_sign and [raw_sign_prehashed].

Instances of this secret are automatically overwritten with zeroes when they fall out of scope.

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§scalar: Scalar

The secret scalar used for signing

§hash_prefix: [u8; 32]

The domain separator used when hashing the message to generate the pseudorandom r value

Implementations§

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impl ExpandedSecretKey

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pub fn from_bytes(bytes: &[u8; 64]) -> Self

Construct an ExpandedSecretKey from an array of 64 bytes. In the spec, the bytes are the output of a SHA-512 hash. This clamps the first 32 bytes and uses it as a scalar, and uses the second 32 bytes as a domain separator for hashing.

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pub fn from_slice(bytes: &[u8]) -> Result<Self, SignatureError>

Construct an ExpandedSecretKey from a slice of 64 bytes.

§Returns

A Result whose okay value is an EdDSA ExpandedSecretKey or whose error value is an SignatureError describing the error that occurred, namely that the given slice’s length is not 64.

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impl ConstantTimeEq for ExpandedSecretKey

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fn ct_eq(&self, other: &Self) -> Choice

Determine if two items are equal. Read more
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fn ct_ne(&self, other: &Self) -> Choice

Determine if two items are NOT equal. Read more
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impl Debug for ExpandedSecretKey

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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 Drop for ExpandedSecretKey

Available on crate feature zeroize only.
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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl From<&[u8; 32]> for ExpandedSecretKey

The spec-compliant way to define an expanded secret key. This computes SHA512(sk), clamps the first 32 bytes and uses it as a scalar, and uses the second 32 bytes as a domain separator for hashing.

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fn from(secret_key: &SecretKey) -> ExpandedSecretKey

Converts to this type from the input type.
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impl From<&ExpandedSecretKey> for VerifyingKey

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fn from(expanded_secret_key: &ExpandedSecretKey) -> VerifyingKey

Derive this public key from its corresponding ExpandedSecretKey.

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impl PartialEq for ExpandedSecretKey

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fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl TryFrom<&[u8]> for ExpandedSecretKey

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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]) -> Result<Self, Self::Error>

Performs the conversion.
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impl Eq for ExpandedSecretKey

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impl ZeroizeOnDrop for ExpandedSecretKey

Available on crate feature zeroize only.

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Causes self to use its LowerExp implementation when Debug-formatted.
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Causes self to use its LowerHex implementation when Debug-formatted.
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes