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#include "poly1305.h"
/* For OpenSSL >= 1.1.1 the hmac_nif and cmac_nif could be integrated into poly1305 (with 'type' as parameter) */
ERL_NIF_TERM poly1305_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, Text) */
#ifdef HAVE_POLY1305
ErlNifBinary key_bin, text, ret_bin;
ERL_NIF_TERM ret = atom_error;
EVP_PKEY *key = NULL;
EVP_MD_CTX *mctx = NULL;
EVP_PKEY_CTX *pctx = NULL;
const EVP_MD *md = NULL;
size_t size;
int type;
type = EVP_PKEY_POLY1305;
if (!enif_inspect_binary(env, argv[0], &key_bin) ||
!(key_bin.size == 32) ) {
return enif_make_badarg(env);
}
if (!enif_inspect_binary(env, argv[1], &text) ) {
return enif_make_badarg(env);
}
key = EVP_PKEY_new_raw_private_key(type, /*engine*/ NULL, key_bin.data, key_bin.size);
if (!key ||
!(mctx = EVP_MD_CTX_new()) ||
!EVP_DigestSignInit(mctx, &pctx, md, /*engine*/ NULL, key) ||
!EVP_DigestSignUpdate(mctx, text.data, text.size)) {
goto err;
}
if (!EVP_DigestSignFinal(mctx, NULL, &size) ||
!enif_alloc_binary(size, &ret_bin) ||
!EVP_DigestSignFinal(mctx, ret_bin.data, &size)) {
goto err;
}
if ((size != ret_bin.size) &&
!enif_realloc_binary(&ret_bin, size)) {
goto err;
}
ret = enif_make_binary(env, &ret_bin);
err:
EVP_MD_CTX_free(mctx);
EVP_PKEY_free(key);
return ret;
#else
return atom_notsup;
#endif
}
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