export interface EthSignature {
    r: Buffer;
    s: Buffer;
    recovery: 0 | 1;
}
export declare function getPublicKeyUncompressed(privateKey: Buffer | Uint8Array): Buffer;
/**
 * Generate a fresh secp256k1 secret key. Uses the platform CSPRNG via
 * noble's utility, which is uniform over the valid scalar range (handles
 * the vanishingly small bias of raw 256-bit random against N).
 */
export declare function randomSecretKey(): Buffer;
/**
 * Signs a 32-byte digest and returns the Ethereum-shaped components.
 * The noble v3 recovered format is `recovery || r || s` (recovery is byte 0).
 */
export declare function signDigest(digest: Buffer | Uint8Array, privateKey: Buffer | Uint8Array): EthSignature;
/**
 * Recover the 65-byte uncompressed public key (with 0x04 prefix) from a digest and signature.
 * Used in tests and address derivation from signature.
 */
export declare function recoverPublicKey(digest: Buffer | Uint8Array, sig: EthSignature): Buffer;
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