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-rw-r--r--lib/crypto/c_src/crypto.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index b2f31870b9..0e17279e62 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -429,6 +429,7 @@ static ERL_NIF_TERM aes_ige_crypt_nif(ErlNifEnv* env, int argc, const ERL_NIF_TE
static ERL_NIF_TERM aes_ctr_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM strong_rand_bytes_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM strong_rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM mod_exp_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM dss_verify_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
@@ -501,6 +502,7 @@ static ErlNifFunc nif_funcs[] = {
{"aes_ctr_stream_encrypt", 2, aes_ctr_stream_encrypt},
{"aes_ctr_stream_decrypt", 2, aes_ctr_stream_encrypt},
{"strong_rand_bytes_nif", 1, strong_rand_bytes_nif},
+ {"strong_rand_uniform_nif", 2, strong_rand_uniform_nif},
{"rand_uniform_nif", 2, rand_uniform_nif},
{"mod_exp_nif", 4, mod_exp_nif},
{"dss_verify_nif", 4, dss_verify_nif},
@@ -2331,6 +2333,38 @@ static ERL_NIF_TERM bin_from_bn(ErlNifEnv* env, const BIGNUM *bn)
return term;
}
+static ERL_NIF_TERM strong_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);
+ if (BN_rand_range(bn_rand, bn_to) != 1) {
+ ret = atom_false;
+ }
+ else {
+ 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;
+}
+
static 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;