Instance Method

signature(for:)

Generates a BIP-340 Schnorr signature from a pre-computed digest using secp256k1_schnorrsig_sign_custom with fresh 32-byte auxiliary randomness.

iOS 13.0+
macCatalyst 13.0+
macOS 10.15+
tvOS 13.0+
visionOS 1.0+
watchOS 6.0+

func signature<D>(for digest: D) throws -> P256K.Schnorr.SchnorrSignature where D : Digest

Parameters

digest: The pre-computed message digest to sign.

Return Value

A 64-byte P256K.Schnorr.SchnorrSignature.

Discussion

The auxiliary randomness is mixed into the BIP-340 nonce derivation (secp256k1_nonce_function_bip340) to protect against fault attacks. When the digest was produced using BIP-340 Tagged Hashes, the resulting signature is fully BIP-340 compliant.

Throws

secp256k1Error.underlyingCryptoError if signature production fails.