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#include "cmac.h"
#include "cipher.h"
ERL_NIF_TERM cmac_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Type, Key, Data) */
#if defined(HAVE_CMAC)
struct cipher_type_t *cipherp = NULL;
const EVP_CIPHER *cipher;
CMAC_CTX *ctx;
ErlNifBinary key;
ErlNifBinary data;
ERL_NIF_TERM ret;
size_t ret_size;
if (!enif_inspect_iolist_as_binary(env, argv[1], &key)
|| !(cipherp = get_cipher_type(argv[0], key.size))
|| !enif_inspect_iolist_as_binary(env, argv[2], &data)) {
return enif_make_badarg(env);
}
cipher = cipherp->cipher.p;
if (!cipher) {
return enif_raise_exception(env, atom_notsup);
}
ctx = CMAC_CTX_new();
if (!CMAC_Init(ctx, key.data, key.size, cipher, NULL)) {
CMAC_CTX_free(ctx);
return atom_notsup;
}
if (!CMAC_Update(ctx, data.data, data.size) ||
!CMAC_Final(ctx,
enif_make_new_binary(env, EVP_CIPHER_block_size(cipher), &ret),
&ret_size)) {
CMAC_CTX_free(ctx);
return atom_notsup;
}
ASSERT(ret_size == (unsigned)EVP_CIPHER_block_size(cipher));
CMAC_CTX_free(ctx);
CONSUME_REDS(env, data);
return ret;
#else
/* The CMAC functionality was introduced in OpenSSL 1.0.1
* Although OTP requires at least version 0.9.8, the versions 0.9.8 and 1.0.0 are
* no longer maintained. */
return atom_notsup;
#endif
}
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