import { VerifyResult } from '@azure/keyvault-keys';
/**
 * Verifies a JWT token using an Azure Key Vault key via cryptographic verification.
 * The token's signature is verified using the SHA-256 digest of the header and payload.
 *
 * @param keyURL - The URL of the Azure Key Vault instance
 * @param keyName - The name of the key to use for verification
 * @param algorithm - The signing algorithm identifier (e.g. `'ES256'`)
 * @param jwtToken - The JWT token string in `header.payload.signature` format
 * @returns A promise resolving to a {@link VerifyResult} indicating success or failure
 * @throws {Error} When the JWT token is not in a valid 3-part format
 */
export declare function verifyJWTToken(keyURL: string, keyName: string, algorithm: string, jwtToken: string): Promise<VerifyResult>;
/**
 * Verifies a JWT token against a JWK set stored as a secret in Azure Key Vault.
 * Iterates over all keys in the JWK set; returns `true` if any key validates the token.
 *
 * @param keyURL - The URL of the Azure Key Vault instance
 * @param secretName - The name of the secret containing the JWK set as a JSON string
 * @param jwtToken - The JWT token string to verify
 * @returns A promise resolving to a {@link VerifyResult} with `result: true` on success
 * @throws {Error} When all keys fail verification, or the secret is not a valid JWK set
 */
export declare function verifyJWTTokenBySecret(keyURL: string, secretName: string, jwtToken: string): Promise<VerifyResult>;
/**
 * Signs a payload using an Azure Key Vault key and returns a base64url-encoded signature.
 * The payload is hashed with SHA-256 before signing.
 *
 * @param keyURL - The URL of the Azure Key Vault instance
 * @param keyName - The name of the key to use for signing
 * @param algorithm - The signing algorithm identifier (e.g. `'ES256'`)
 * @param payload - The string payload to sign
 * @returns A promise resolving to the base64url-encoded signature string
 */
export declare function signJWTToken(keyURL: string, keyName: string, algorithm: string, payload: string): Promise<string>;