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#include "handy.h"
#include "dstr.h"
#include "shitlisp.h"
#include "aes.h"
#include "sha2.h"
#include "hmac.h"
#include "pbkdf2.h"
#include <assert.h>
static sl_value * aes_block_fn(sl_value *self, sl_value *args, sl_symboltab *tab,
void (*blockfn)(const cf_aes_context *ctx,
const uint8_t *in,
uint8_t *out))
{
sl_iter it = sl_iter_start(args);
sl_value *key = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
sl_value *block = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
sl_value *ret = NULL;
if (!key || !block ||
(key->u.bytes.len != 16 && key->u.bytes.len != 24 && key->u.bytes.len != 32) ||
block->u.bytes.len != AES_BLOCKSZ)
{
ret = sl_get_nil();
goto x_err;
}
cf_aes_context ctx;
cf_aes_init(&ctx, key->u.bytes.buf, key->u.bytes.len);
uint8_t blockout[AES_BLOCKSZ];
blockfn(&ctx, block->u.bytes.buf, blockout);
ret = sl_new_bytes(blockout, AES_BLOCKSZ);
cf_aes_finish(&ctx);
x_err:
sl_decref(key);
sl_decref(block);
return ret;
}
static sl_value * aes_block_encrypt(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return aes_block_fn(self, args, tab, cf_aes_encrypt);
}
static sl_value * aes_block_decrypt(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return aes_block_fn(self, args, tab, cf_aes_decrypt);
}
/* Hashing */
static sl_value * hash_fn(sl_value *self, sl_value *args, sl_symboltab *tab, const cf_chash *h)
{
sl_iter it = sl_iter_start(args);
sl_value *msg = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
if (!msg)
return sl_get_nil();
cf_chash_ctx ctx;
assert(h->ctxsz <= CF_CHASH_MAXCTX);
h->init(&ctx);
h->update(&ctx, msg->u.bytes.buf, msg->u.bytes.len);
sl_decref(msg);
uint8_t result[CF_MAXHASH];
assert(h->hashsz <= CF_MAXHASH);
h->digest(&ctx, result);
return sl_new_bytes(result, h->hashsz);
}
static sl_value * sha224(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return hash_fn(self, args, tab, &cf_sha224);
}
static sl_value * sha256(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return hash_fn(self, args, tab, &cf_sha256);
}
static sl_value * sha384(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return hash_fn(self, args, tab, &cf_sha384);
}
static sl_value * sha512(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return hash_fn(self, args, tab, &cf_sha512);
}
/* HMAC */
static sl_value * hmac_fn(sl_value *self, sl_value *args, sl_symboltab *tab, const cf_chash *h)
{
sl_iter it = sl_iter_start(args);
sl_value *key = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
sl_value *msg = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
if (!key || !msg)
{
sl_decref(key);
sl_decref(msg);
return sl_get_nil();
}
uint8_t result[CF_MAXHASH];
cf_hmac(key->u.bytes.buf, key->u.bytes.len,
msg->u.bytes.buf, msg->u.bytes.len,
result,
h);
sl_decref(key);
sl_decref(msg);
return sl_new_bytes(result, h->hashsz);
}
static sl_value * hmac_sha224(sl_value *self, sl_value *args, sl_symboltab *tab)
{ return hmac_fn(self, args, tab, &cf_sha224); }
static sl_value * hmac_sha256(sl_value *self, sl_value *args, sl_symboltab *tab)
{ return hmac_fn(self, args, tab, &cf_sha256); }
static sl_value * hmac_sha384(sl_value *self, sl_value *args, sl_symboltab *tab)
{ return hmac_fn(self, args, tab, &cf_sha384); }
static sl_value * hmac_sha512(sl_value *self, sl_value *args, sl_symboltab *tab)
{ return hmac_fn(self, args, tab, &cf_sha512); }
/* PBKDF2 */
static sl_value * do_pbkdf2(const cf_chash *h, sl_value *pw, sl_value *salt,
uint32_t iterations, uint32_t outlen)
{
dstr out;
dstr_init(&out);
if (dstr_expand(&out, outlen))
return NULL;
cf_pbkdf2_hmac(pw->u.bytes.buf, pw->u.bytes.len,
salt->u.bytes.buf, salt->u.bytes.len,
iterations,
(uint8_t *) out.start, outlen,
h);
sl_value *ret = sl_new_bytes((uint8_t *) out.start, outlen);
dstr_free(&out);
return ret;
}
static sl_value * pbkdf2_fn(sl_value *self, sl_value *args, sl_symboltab *tab, const cf_chash *h)
{
sl_iter it = sl_iter_start(args);
sl_value *pw = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
sl_value *salt = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_bytes, tab);
sl_value *iterations = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_integer, tab);
sl_value *outlen = sl_iter_convert(&it, sl_preprocess_eval, sl_assert_integer, tab);
sl_value *ret;
if (!pw || !salt || !iterations || !outlen)
ret = sl_get_nil();
else
{
assert(bignum_len_words(&iterations->u.integer.bn) == 1);
assert(bignum_len_words(&outlen->u.integer.bn) == 1);
ret = do_pbkdf2(h, pw, salt,
iterations->u.integer.bn.v[0],
outlen->u.integer.bn.v[0]);
}
sl_decref(pw);
sl_decref(salt);
sl_decref(iterations);
sl_decref(outlen);
return ret;
}
static sl_value * pbkdf2_sha224(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return pbkdf2_fn(self, args, tab, &cf_sha224);
}
static sl_value * pbkdf2_sha256(sl_value *self, sl_value *args, sl_symboltab *tab)
{
return pbkdf2_fn(self, args, tab, &cf_sha256);
}
int SL_MODULE_ENTRY(sl_symboltab *tab)
{
ER(sl_symboltab_add_name_native(tab, "aes-encrypt", aes_block_encrypt));
ER(sl_symboltab_add_name_native(tab, "aes-decrypt", aes_block_decrypt));
ER(sl_symboltab_add_name_native(tab, "sha224", sha224));
ER(sl_symboltab_add_name_native(tab, "sha256", sha256));
ER(sl_symboltab_add_name_native(tab, "sha384", sha384));
ER(sl_symboltab_add_name_native(tab, "sha512", sha512));
ER(sl_symboltab_add_name_native(tab, "hmac-sha224", hmac_sha224));
ER(sl_symboltab_add_name_native(tab, "hmac-sha256", hmac_sha256));
ER(sl_symboltab_add_name_native(tab, "hmac-sha384", hmac_sha384));
ER(sl_symboltab_add_name_native(tab, "hmac-sha512", hmac_sha512));
ER(sl_symboltab_add_name_native(tab, "pbkdf2-sha224", pbkdf2_sha224));
ER(sl_symboltab_add_name_native(tab, "pbkdf2-sha256", pbkdf2_sha256));
return 0;
}
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