ERL_NIF_TERM rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Lo,Hi) */
BIGNUM *bn_from = NULL, *bn_to, *bn_rand;
unsigned char* data;
unsigned dlen;
ERL_NIF_TERM ret;
if (!get_bn_from_mpint(env, argv[0], &bn_from)
|| !get_bn_from_mpint(env, argv[1], &bn_rand)) {
if (bn_from) BN_free(bn_from);
return enif_make_badarg(env);
}
bn_to = BN_new();
BN_sub(bn_to, bn_rand, bn_from);
BN_pseudo_rand_range(bn_rand, bn_to);
BN_add(bn_rand, bn_rand, bn_from);
dlen = BN_num_bytes(bn_rand);
data = enif_make_new_binary(env, dlen+4, &ret);
put_int32(data, dlen);
BN_bn2bin(bn_rand, data+4);
ERL_VALGRIND_MAKE_MEM_DEFINED(data+4, dlen);
BN_free(bn_rand);
BN_free(bn_from);
BN_free(bn_to);
return ret;
}
ERL_NIF_TERM strong_rand_bytes_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Bytes) */
unsigned bytes;
unsigned char* data;
ERL_NIF_TERM ret;
if (!enif_get_uint(env, argv[0], &bytes)) {
return enif_make_badarg(env);
}
data = enif_make_new_binary(env, bytes, &ret);
if ( RAND_bytes(data, bytes) != 1) {
return atom_false;
}
ERL_VALGRIND_MAKE_MEM_DEFINED(data, bytes);
return ret;
}
ERL_NIF_TERM bn2term(ErlNifEnv* env, const BIGNUM *bn)
{
int dlen;
unsigned char* ptr;
ERL_NIF_TERM ret;
if (bn == NULL)
return atom_undefined;
dlen = BN_num_bytes(bn);
if (dlen < 0)
goto err;
if ((ptr = enif_make_new_binary(env, (size_t)dlen, &ret)) == NULL)
goto err;
BN_bn2bin(bn, ptr);
ERL_VALGRIND_MAKE_MEM_DEFINED(ptr, dlen);
return ret;
err:
return enif_make_badarg(env);
}
ERL_NIF_TERM dh_generate_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (PrivKey|undefined, DHParams=[P,G], Mpint, Len|0) */
DH *dh_params = NULL;
int mpint; /* 0 or 4 */
{
ERL_NIF_TERM head, tail;
BIGNUM
*dh_p = NULL,
*dh_g = NULL,
*priv_key_in = NULL;
unsigned long
len = 0;
if (!(get_bn_from_bin(env, argv[0], &priv_key_in)
|| argv[0] == atom_undefined)
|| !enif_get_list_cell(env, argv[1], &head, &tail)
|| !get_bn_from_bin(env, head, &dh_p)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dh_g)
|| !enif_is_empty_list(env, tail)
|| !enif_get_int(env, argv[2], &mpint) || (mpint & ~4)
|| !enif_get_ulong(env, argv[3], &len)
/* Load dh_params with values to use by the generator.
Mem mgmnt transfered from dh_p etc to dh_params */
|| !(dh_params = DH_new())
|| (priv_key_in && !DH_set0_key(dh_params, NULL, priv_key_in))
|| !DH_set0_pqg(dh_params, dh_p, NULL, dh_g)
) {
if (priv_key_in) BN_free(priv_key_in);
if (dh_p) BN_free(dh_p);
if (dh_g) BN_free(dh_g);
if (dh_params) DH_free(dh_params);
return enif_make_badarg(env);
}
if (len) {
if (len < BN_num_bits(dh_p))
DH_set_length(dh_params, len);
else {
if (priv_key_in) BN_free(priv_key_in);
if (dh_p) BN_free(dh_p);
if (dh_g) BN_free(dh_g);
if (dh_params) DH_free(dh_params);
return enif_make_badarg(env);
}
}
}
#ifdef HAS_EVP_PKEY_CTX
{
EVP_PKEY_CTX *ctx;
EVP_PKEY *dhkey, *params;
int success;
params = EVP_PKEY_new();
success = EVP_PKEY_set1_DH(params, dh_params); /* set the key referenced by params to dh_params... */
DH_free(dh_params); /* ...dh_params (and params) must be freed */
if (!success) return atom_error;
ctx = EVP_PKEY_CTX_new(params, NULL);
EVP_PKEY_free(params);
if (!ctx) {
return atom_error;
}
if (!EVP_PKEY_keygen_init(ctx)) {
/* EVP_PKEY_CTX_free(ctx); */
return atom_error;
}
dhkey = EVP_PKEY_new();
if (!EVP_PKEY_keygen(ctx, &dhkey)) { /* "performs a key generation operation, the ... */
/*... generated key is written to ppkey." (=last arg) */
/* EVP_PKEY_CTX_free(ctx); */
/* EVP_PKEY_free(dhkey); */
return atom_error;
}
dh_params = EVP_PKEY_get1_DH(dhkey); /* return the referenced key. dh_params and dhkey must be freed */
EVP_PKEY_free(dhkey);
if (!dh_params) {
/* EVP_PKEY_CTX_free(ctx); */
return atom_error;
}
EVP_PKEY_CTX_free(ctx);
}
#else
if (!DH_generate_key(dh_params)) return atom_error;
#endif
{
unsigned char *pub_ptr, *prv_ptr;
int pub_len, prv_len;
ERL_NIF_TERM ret_pub, ret_prv;
const BIGNUM *pub_key_gen, *priv_key_gen;
DH_get0_key(dh_params,
&pub_key_gen, &priv_key_gen); /* Get pub_key_gen and priv_key_gen.
"The values point to the internal representation of
the public key and private key values. This memory
should not be freed directly." says man */
pub_len = BN_num_bytes(pub_key_gen);
prv_len = BN_num_bytes(priv_key_gen);
pub_ptr = enif_make_new_binary(env, pub_len+mpint, &ret_pub);
prv_ptr = enif_make_new_binary(env, prv_len+mpint, &ret_prv);
if (mpint) {
put_int32(pub_ptr, pub_len); pub_ptr += 4;
put_int32(prv_ptr, prv_len); prv_ptr += 4;
}
BN_bn2bin(pub_key_gen, pub_ptr);
BN_bn2bin(priv_key_gen, prv_ptr);
ERL_VALGRIND_MAKE_MEM_DEFINED(pub_ptr, pub_len);
ERL_VALGRIND_MAKE_MEM_DEFINED(prv_ptr, prv_len);
DH_free(dh_params);
return enif_make_tuple2(env, ret_pub, ret_prv);
}
}
