#include "lua.h"
#include "openssl.h"
#include "private.h"

#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
#include <openssl/kdf.h>
#include <openssl/core_names.h>

typedef enum {
  PARAM_T_INT = 1,
  PARAM_T_UINT,
  PARAM_T_LONG,
  PARAM_T_ULONG,
  PARAM_T_INT32,
  PARAM_T_UINT32,
  PARAM_T_INT64,
  PARAM_T_UINT64,
  PARAM_T_SIZE_T,
  PARAM_T_TIME_T,
  PARAM_T_BN,
  PARAM_T_DOUBLE,
} PARAM_NUMBER_TYPE;

struct param_info {
  const char* name;
  int data_type;
  PARAM_NUMBER_TYPE number_type;
};

/* KDF / PRF parameters */
static struct param_info kdf_params[] = {
  { OSSL_KDF_PARAM_SECRET,  OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_KEY,     OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_SALT,    OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_PASSWORD,OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_PREFIX,  OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_LABEL,   OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_DATA,    OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_UKM,     OSSL_PARAM_OCTET_STRING, 0 },

  { OSSL_KDF_PARAM_INFO,             OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_SEED,             OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_SSHKDF_XCGHASH,   OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_SSHKDF_SESSION_ID,OSSL_PARAM_OCTET_STRING, 0 },
  { OSSL_KDF_PARAM_CONSTANT,         OSSL_PARAM_OCTET_STRING, 0 },

  { OSSL_KDF_PARAM_DIGEST,    OSSL_PARAM_UTF8_STRING,  0 },
  { OSSL_KDF_PARAM_CIPHER,    OSSL_PARAM_UTF8_STRING,  0 },
  { OSSL_KDF_PARAM_MAC,       OSSL_PARAM_UTF8_STRING,  0 },
  { OSSL_KDF_PARAM_PROPERTIES,OSSL_PARAM_UTF8_STRING,  0 },
  { OSSL_KDF_PARAM_MODE,      OSSL_PARAM_UTF8_STRING,  0 },
  { OSSL_KDF_PARAM_CEK_ALG,   OSSL_PARAM_UTF8_STRING,  0 },

  { OSSL_KDF_PARAM_MAC_SIZE,   OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_SIZE_T},
  { OSSL_KDF_PARAM_ITER,       OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_UINT},
  { OSSL_KDF_PARAM_SCRYPT_N,   OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_UINT32},
  { OSSL_KDF_PARAM_SCRYPT_R,   OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_UINT32},
  { OSSL_KDF_PARAM_SCRYPT_P,   OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_UINT32},

  { OSSL_KDF_PARAM_SCRYPT_MAXMEM,       OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_UINT64},
  { OSSL_KDF_PARAM_PKCS5,               OSSL_PARAM_INTEGER,  PARAM_T_INT},
  { OSSL_KDF_PARAM_SSHKDF_TYPE,         OSSL_PARAM_INTEGER,  PARAM_T_INT},
  { OSSL_KDF_PARAM_PKCS12_ID,           OSSL_PARAM_INTEGER,  PARAM_T_INT},
  { OSSL_KDF_PARAM_KBKDF_USE_L,         OSSL_PARAM_INTEGER,  PARAM_T_INT},
  { OSSL_KDF_PARAM_KBKDF_USE_SEPARATOR, OSSL_PARAM_INTEGER,  PARAM_T_INT},

#if defined(OSSL_KDF_PARAM_KBKDF_R)
  { OSSL_KDF_PARAM_KBKDF_R,   OSSL_PARAM_INTEGER,  PARAM_T_INT},
#endif

  { OSSL_KDF_PARAM_SIZE,   OSSL_PARAM_UNSIGNED_INTEGER,  PARAM_T_SIZE_T},

  { NULL, 0, 0}
};

static int get_param_type(const char* name, PARAM_NUMBER_TYPE *nt)
{
  int i;

  for(i = 0; i < sizeof(kdf_params)/sizeof(kdf_params[0]); i++) {
    struct param_info *p = &kdf_params[i];
    if (p->name && strcmp(p->name, name)==0)
    {
      *nt = p->number_type;
      return p->data_type;
    }
  }
  return 0;
}

int openssl_pushparams(lua_State *L, const OSSL_PARAM* params)
{
  int i = 0;
  const OSSL_PARAM *p = params;

  lua_newtable(L);
  while(p->key)
  {
    lua_newtable(L);
    lua_pushliteral(L, "name");
    lua_pushstring(L, p->key);
    lua_rawset(L, -3);

    lua_pushliteral(L, "data_type");
    lua_pushinteger(L, p->data_type);
    lua_rawset(L, -3);

    if (p->data)
    {
      lua_pushliteral(L, "data");
      switch(p->data_type)
      {
      case OSSL_PARAM_INTEGER:
      case OSSL_PARAM_UNSIGNED_INTEGER:
        lua_pushinteger(L, (lua_Integer)p->data);
        break;
      case OSSL_PARAM_REAL:
        lua_pushnumber(L, (lua_Number)p->data_type);
        break;
      case OSSL_PARAM_UTF8_STRING:
      case OSSL_PARAM_OCTET_STRING:
        lua_pushlstring(L, (const char*)p->data, p->return_size);
        break;
      case OSSL_PARAM_UTF8_PTR:
      case OSSL_PARAM_OCTET_PTR:
        lua_pushlightuserdata(L, p->data);
        break;
      default:
        lua_pushnil(L);
      }
      lua_rawset(L, -3);
    }
    lua_rawseti(L, -2, ++i);
    p++;
  }

  return 1;
}

OSSL_PARAM* openssl_toparams(lua_State *L, int idx)
{
  OSSL_PARAM *params;
  lua_Number *values;

  size_t i, len = lua_rawlen(L, idx);

  luaL_checktype(L, idx, LUA_TTABLE);
  luaL_argcheck(L, len>0, idx, "empty paramaters table");

  params = OPENSSL_malloc((sizeof(OSSL_PARAM)+sizeof(lua_Number)) * (len+1));
  memset(params, 0, sizeof(OSSL_PARAM)+sizeof(lua_Number) * (len+1));
  values = (lua_Number*)((char*) params + sizeof(OSSL_PARAM) * (len+1));

  for (i = 0; i < len; i++)
  {
    size_t sz = 0;
    int type = 0;
    PARAM_NUMBER_TYPE nt = 0;
    const char* name;
    const char* str;

    /* get paramater node */
    lua_rawgeti(L, idx, i+1);

    /* get paramater name */
    lua_pushliteral(L, "name");
    lua_rawget(L, -2);
    name = luaL_checkstring(L, -1);
    lua_pop(L, 1);

    type = get_param_type(name, &nt);

    /* get paramater data */
    lua_pushliteral(L, "data");
    lua_rawget(L, -2);
    if (!lua_isnil(L, -1))
    {
      switch(type)
      {
      case OSSL_PARAM_INTEGER:
      case OSSL_PARAM_UNSIGNED_INTEGER:
        {
          values[i] = luaL_checknumber(L, -1);
          switch((int)nt)
          {
            case PARAM_T_INT:
            {
              *(int*)&values[i] = (int)(values[i]);
              params[i] = OSSL_PARAM_construct_int(name, (int*)&values[i]);
              break;
            }
            case PARAM_T_UINT:
            {
              *(unsigned int*)&values[i] = (unsigned int)(values[i]);
              params[i] = OSSL_PARAM_construct_uint(name,(unsigned int*)&values[i]);
              break;
            }
            case PARAM_T_LONG:
            {
              *(long*)&values[i] = (long)(values[i]);
              params[i] = OSSL_PARAM_construct_long(name, (long*)&values[i]);
              break;
            }
            case PARAM_T_ULONG:
            {
              *(unsigned long*)&values[i] = (unsigned long)(values[i]);
              params[i] = OSSL_PARAM_construct_ulong(name, (unsigned long*)&values[i]);
              break;
            }
            case PARAM_T_INT32:
            {
              *(int32_t*)&values[i] = (int32_t)(values[i]);
              params[i] = OSSL_PARAM_construct_int32(name, (int32_t*)&values[i]);
              break;
            }
            case PARAM_T_UINT32:
            {
              *(uint32_t*)&values[i] = (uint32_t)(values[i]);
              params[i] = OSSL_PARAM_construct_uint32(name, (uint32_t*)&values[i]);
              break;
            }
            case PARAM_T_INT64:
            {
              *(int64_t*)&values[i] = (int64_t)(values[i]);
              params[i] = OSSL_PARAM_construct_int64(name, (int64_t*)&values[i]);
              break;
            }
            case PARAM_T_UINT64:
            {
              *(uint64_t*)&values[i] = (uint64_t)(values[i]);
              params[i] = OSSL_PARAM_construct_uint64(name, (uint64_t*)&values[i]);
              break;
            }
            case PARAM_T_TIME_T:
            {
              *(time_t*)&values[i] = (time_t)(values[i]);
              params[i] = OSSL_PARAM_construct_time_t(name, (time_t*)&values[i]);
              break;
            }
            case PARAM_T_SIZE_T:
            {
              *(size_t*)&values[i] = (size_t)(values[i]);
              params[i] = OSSL_PARAM_construct_size_t(name, (size_t*)&values[i]);
              break;
            }
            case PARAM_T_DOUBLE:
            {
              *(double*)&values[i] = (double)(values[i]);
              params[i] = OSSL_PARAM_construct_double(name, (double*)&values[i]);
              break;
            }
            default:
              fprintf(stderr, "%s:%d in %s: Error NYI\n", __FILE__, __LINE__, __FUNCTION__);
              lua_pop(L, 2);
              goto done;
          }
        }
      break;
      case OSSL_PARAM_UTF8_STRING:
        str = luaL_checklstring(L, -1, &sz);
        params[i] = OSSL_PARAM_construct_utf8_string(
                    name,
                    (void*)str,
                    sz);
        break;
      case OSSL_PARAM_OCTET_STRING:
        str = luaL_checklstring(L, -1, &sz);
        params[i] = OSSL_PARAM_construct_octet_string(
                    name,
                    (void*)str,
                    sz);
        break;
      default:
        fprintf(stderr, "%s:%d in %s: Error NYI\n", __FILE__, __LINE__, __FUNCTION__);
        lua_pop(L, 2);
        goto done;
      }
    }
    lua_pop(L, 1);
    lua_pop(L, 1);
  }

done:

  params[i] = OSSL_PARAM_construct_end();
  return params;
}


int luaopen_param(lua_State *L)
{
  int i;

  lua_newtable(L);

  lua_pushliteral(L, "kdf");
  lua_newtable(L);

  for(i = 0; i < sizeof(kdf_params)/sizeof(kdf_params[0]); i++) {
    struct param_info *p = &kdf_params[i];
    if (p->name)
    {
      lua_pushstring(L, p->name);
      lua_newtable(L);
      lua_pushliteral(L, "type");
      lua_pushinteger(L, p->data_type);
      lua_rawset(L, -3);
      if (p->number_type) {
        lua_pushliteral(L, "number_type");
        switch((int)p->number_type)
        {
          case PARAM_T_INT:
            lua_pushliteral(L, "int");
            break;
          case PARAM_T_UINT:
            lua_pushliteral(L, "unsinged int");
            break;
          case PARAM_T_LONG:
            lua_pushliteral(L, "long");
            break;
          case PARAM_T_ULONG:
            lua_pushliteral(L, "unsinged long");
            break;
          case PARAM_T_INT32:
            lua_pushliteral(L, "int32");
            break;
          case PARAM_T_UINT32:
            lua_pushliteral(L, "uint32");
            break;
          case PARAM_T_INT64:
            lua_pushliteral(L, "int64");
            break;
          case PARAM_T_UINT64:
            lua_pushliteral(L, "uint64");
            break;
          case PARAM_T_SIZE_T:
            lua_pushliteral(L, "size_t");
            break;
          case PARAM_T_TIME_T:
            lua_pushliteral(L, "time_t");
            break;
          case PARAM_T_BN:
            lua_pushliteral(L, "BIGNUM");
            break;
          case PARAM_T_DOUBLE:
            lua_pushliteral(L, "double");
            break;
          default:
            lua_pushliteral(L, "unknown");
        }
        lua_rawset(L, -3);
      }
      lua_rawset(L, -3);
    }
  }

  lua_rawset(L, -3);

  return 1;
}

#endif