// =============================================================================
// Std::Crypto — backward-compatible wrapper (delegates to submodules)
//
// Migration note: new code should use the submodules directly:
//   Std::Crypto::Hash::{Hash_Sha256, ...}
//   Std::Crypto::Hmac::{Hmac_Sha256, ...}
//   Std::Crypto::Base64::{Base64_Encode, Base64URL_Encode, ...}
//   Std::Crypto::Random::{Random_Bytes, ...}
//   Std::Crypto::Jwt::{Jwt_EncodeHS256, ...}
// =============================================================================
module Std::Crypto {

import Std::Mem::{Alloc, Free};
import Std::String::{String_Len};

// Re-use the same externs from submodules (merged by compiler)
extern func bux_sha256(data: String, len: int, out: *void);
extern func bux_hmac_sha256(key: String, keylen: int, msg: String, msglen: int, out: *void);
extern func bux_random_bytes(buf: *void, len: int) -> int;
extern func bux_base64_encode(data: String, len: int) -> String;
extern func bux_base64_decode(data: String, len: int, outlen: *int) -> String;
extern func bux_bytes_to_hex(data: *void, len: int) -> String;

// --- Legacy function names (delegate to new submodule functions) ---

// SHA-256 → hex
func Crypto_Sha256(data: String) -> String {
    let len: int = String_Len(data) as int;
    let hashBuf: *void = Alloc(32);
    bux_sha256(data, len, hashBuf);
    let result: String = bux_bytes_to_hex(hashBuf as *void, 32);
    Free(hashBuf);
    return result;
}

// HMAC-SHA256 → hex
func Crypto_HmacSha256(key: String, message: String) -> String {
    let keylen: int = String_Len(key) as int;
    let msglen: int = String_Len(message) as int;
    let hmacBuf: *void = Alloc(32);
    bux_hmac_sha256(key, keylen, message, msglen, hmacBuf);
    let result: String = bux_bytes_to_hex(hmacBuf as *void, 32);
    Free(hmacBuf);
    return result;
}

// Random bytes → base64
func Crypto_RandomBytes(n: int) -> String {
    if n <= 0 { return ""; }
    let buf: *void = Alloc(n as uint);
    if bux_random_bytes(buf, n) != 1 {
        Free(buf);
        return "";
    }
    let result: String = bux_base64_encode(buf as String, n);
    Free(buf);
    return result;
}

// Base64 encode
func Crypto_Base64Encode(s: String) -> String {
    return bux_base64_encode(s, String_Len(s) as int);
}

// HMAC-SHA256 raw → base64
func Crypto_HmacSha256Raw(key: String, message: String) -> String {
    let keylen: int = String_Len(key) as int;
    let msglen: int = String_Len(message) as int;
    let hmacBuf: *void = Alloc(32);
    bux_hmac_sha256(key, keylen, message, msglen, hmacBuf);
    let result: String = bux_base64_encode(hmacBuf as String, 32);
    Free(hmacBuf);
    return result;
}

// Base64 decode
func Crypto_Base64Decode(s: String) -> String {
    let outlen: int = 0;
    return bux_base64_decode(s, String_Len(s) as int, &outlen);
}
}