#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

/// secp256k1 helpers used by the XRP wallet. Backed by the OpenSSL build that
/// already ships inside the on-device monero static library, so no extra
/// dependency is linked.
@interface KoinsSecp256k1 : NSObject

/// XRP account private scalar derived from a 16-byte family seed entropy.
+ (nullable NSData *)privateKeyFromEntropy:(NSData *)entropy;

/// 33-byte compressed public key for a 32-byte private scalar.
+ (nullable NSData *)publicKeyFromPrivateKey:(NSData *)privateKey;

/// DER-encoded, low-S ECDSA signature over a 32-byte digest.
+ (nullable NSData *)signDigest:(NSData *)digest
                 withPrivateKey:(NSData *)privateKey;

/// (left + right) mod n, used by BIP-32 hardened child derivation.
+ (nullable NSData *)addScalar:(NSData *)left toScalar:(NSData *)right;

@end

NS_ASSUME_NONNULL_END