/**
 * ECIES Constants and Format Specification
 *
 * These constants define the eccrypto-compatible ECIES format used throughout the SDK.
 * Maintaining these exact values ensures backward compatibility with data encrypted
 * using the original eccrypto library.
 */
/**
 * Elliptic curve parameters
 */
export declare const CURVE: {
    /** The elliptic curve used (secp256k1 - same as Bitcoin/Ethereum) */
    readonly name: "secp256k1";
    /** Private key length in bytes */
    readonly PRIVATE_KEY_LENGTH: 32;
    /** Compressed public key length in bytes (0x02 or 0x03 prefix + 32 bytes) */
    readonly COMPRESSED_PUBLIC_KEY_LENGTH: 33;
    /** Uncompressed public key length in bytes (0x04 prefix + 64 bytes) */
    readonly UNCOMPRESSED_PUBLIC_KEY_LENGTH: 65;
    /** ECDH shared secret X coordinate length */
    readonly SHARED_SECRET_LENGTH: 32;
    /** Public key prefixes */
    readonly PREFIX: {
        /** Uncompressed public key prefix */
        readonly UNCOMPRESSED: 4;
        /** Compressed public key prefix for even Y */
        readonly COMPRESSED_EVEN: 2;
        /** Compressed public key prefix for odd Y */
        readonly COMPRESSED_ODD: 3;
    };
    /** X coordinate starts at byte 1 (after prefix) */
    readonly X_COORDINATE_OFFSET: 1;
    /** X coordinate ends at byte 33 (1 + 32) */
    readonly X_COORDINATE_END: 33;
};
/**
 * Symmetric encryption parameters (AES-256-CBC)
 */
export declare const CIPHER: {
    /** Cipher algorithm - must match eccrypto */
    readonly algorithm: "aes-256-cbc";
    /** AES key length in bytes */
    readonly KEY_LENGTH: 32;
    /** Initialization vector length in bytes */
    readonly IV_LENGTH: 16;
    /** Block size for AES */
    readonly BLOCK_SIZE: 16;
};
/**
 * Key derivation function parameters
 */
export declare const KDF: {
    /** Hash algorithm for key derivation - must match eccrypto */
    readonly algorithm: "sha512";
    /** Output length of SHA-512 in bytes */
    readonly OUTPUT_LENGTH: 64;
    /** Encryption key slice (first 32 bytes of KDF output) */
    readonly ENCRYPTION_KEY_OFFSET: 0;
    readonly ENCRYPTION_KEY_LENGTH: 32;
    /** MAC key slice (last 32 bytes of KDF output) */
    readonly MAC_KEY_OFFSET: 32;
    readonly MAC_KEY_LENGTH: 32;
};
/**
 * Message authentication code parameters
 */
export declare const MAC: {
    /** MAC algorithm - must match eccrypto */
    readonly algorithm: "sha256";
    /** HMAC-SHA256 output length in bytes */
    readonly LENGTH: 32;
};
/**
 * ECIES encrypted data format offsets and lengths
 * Format: [iv(16)][ephemPublicKey(65)][ciphertext(variable)][mac(32)]
 */
export declare const FORMAT: {
    /** Offsets for each component in serialized format */
    readonly IV_OFFSET: 0;
    readonly IV_LENGTH: 16;
    /** Ephemeral public key (always uncompressed in eccrypto format) */
    readonly EPHEMERAL_KEY_OFFSET: 16;
    readonly EPHEMERAL_KEY_LENGTH: 65;
    /** Ciphertext starts after IV and ephemeral key */
    readonly CIPHERTEXT_OFFSET: number;
    /** MAC is always the last 32 bytes */
    readonly MAC_LENGTH: 32;
    /** Minimum size of encrypted data (IV + ephemKey + MAC, no ciphertext) */
    readonly MIN_ENCRYPTED_LENGTH: number;
    /**
     * Helper to calculate total length of encrypted data
     *
     * @param ciphertextLength - Length of the ciphertext portion
     * @returns Total length including all components
     */
    readonly getTotalLength: (ciphertextLength: number) => number;
};
/**
 * Security constants for data clearing
 */
export declare const SECURITY: {
    /** Overwrite patterns for secure data clearing */
    readonly CLEAR_PATTERNS: {
        readonly ZEROS: 0;
        readonly ONES: 255;
        /** Pattern multiplier for third pass */
        readonly PATTERN_MULTIPLIER: 7;
        /** Pattern offset for third pass */
        readonly PATTERN_OFFSET: 13;
    };
};