/**
 * Computes HMAC-SHA256 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @returns HMAC-SHA256 bytes.
 */
export declare function hmacSha256Sign(key: Uint8Array, msg: Uint8Array): Promise<Uint8Array>;
/**
 * Verifies HMAC-SHA256 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @param sig Signature bytes to verify.
 * @returns True when signature is valid.
 */
export declare function hmacSha256Verify(key: Uint8Array, msg: Uint8Array, sig: Uint8Array): Promise<boolean>;
/**
 * Computes HMAC-SHA512 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @returns HMAC-SHA512 bytes.
 */
export declare function hmacSha512Sign(key: Uint8Array, msg: Uint8Array): Promise<Uint8Array>;
/**
 * Verifies HMAC-SHA512 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @param sig Signature bytes to verify.
 * @returns True when signature is valid.
 */
export declare function hmacSha512Verify(key: Uint8Array, msg: Uint8Array, sig: Uint8Array): Promise<boolean>;
/**
 * Computes HMAC-SHA256 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @returns HMAC-SHA256 bytes.
 */
export declare function hmacSha256SignSync(key: Uint8Array, msg: Uint8Array): Uint8Array;
/**
 * Verifies HMAC-SHA256 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @param sig Signature bytes to verify.
 * @returns True when signature is valid.
 */
export declare function hmacSha256VerifySync(key: Uint8Array, msg: Uint8Array, sig: Uint8Array): boolean;
/**
 * Computes HMAC-SHA512 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @returns HMAC-SHA512 bytes.
 */
export declare function hmacSha512SignSync(key: Uint8Array, msg: Uint8Array): Uint8Array;
/**
 * Verifies HMAC-SHA512 signature.
 * @param key HMAC key bytes.
 * @param msg Message bytes.
 * @param sig Signature bytes to verify.
 * @returns True when signature is valid.
 */
export declare function hmacSha512VerifySync(key: Uint8Array, msg: Uint8Array, sig: Uint8Array): boolean;
/**
 * HMAC-SHA256: UTF-8(`keyUtf8`) is the raw key (Web Crypto `importKey("raw", …, HMAC-SHA-256)` style).
 * Tag is RFC 4648 Base64.
 *
 * @param keyUtf8 Secret string.
 * @param msg Message bytes.
 * @returns Base64 MAC.
 */
export declare function hmacSha256SignUtf8KeyBase64(keyUtf8: string, msg: Uint8Array): Promise<string>;
/** Synchronous {@link hmacSha256SignUtf8KeyBase64}. */
export declare function hmacSha256SignUtf8KeyBase64Sync(keyUtf8: string, msg: Uint8Array): string;
/**
 * HMAC-SHA256 over UTF-8(`JSON.stringify(data)`) with UTF-8 string key; see {@link hmacSha256SignUtf8KeyBase64}.
 *
 * @param keyUtf8 Secret string.
 * @param data `JSON.stringify` input.
 * @returns Base64 MAC.
 */
export declare function hmacSha256SignJsonUtf8KeyBase64(keyUtf8: string, data: unknown): Promise<string>;
/** Synchronous {@link hmacSha256SignJsonUtf8KeyBase64}. */
export declare function hmacSha256SignJsonUtf8KeyBase64Sync(keyUtf8: string, data: unknown): string;
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