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authorLukas Larsson <lukas@erlang-solutions.com>2014-02-13 18:14:10 +0100
committerLukas Larsson <lukas@erlang-solutions.com>2014-02-24 15:16:06 +0100
commitd58602adef3412b354fd521bbd4bda24a0b1a789 (patch)
treef77e5139df373983c15e2eca62943ba6bde927f1
parent3b0eb33f899f361d5006824782e1ef1d16f57e5c (diff)
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crypto: Add rand_seed function
This function is needed on OSs that do not automatically initialize the PRNG seed.
-rw-r--r--lib/crypto/c_src/crypto.c15
-rw-r--r--lib/crypto/doc/src/crypto.xml15
2 files changed, 29 insertions, 1 deletions
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index 925ad0c091..bf8107d10b 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -254,6 +254,8 @@ static ERL_NIF_TERM ecdsa_sign_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM
static ERL_NIF_TERM ecdsa_verify_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM ecdh_compute_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM rand_seed_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+
/* helpers */
static void init_algorithms_types(ErlNifEnv*);
@@ -381,7 +383,9 @@ static ErlNifFunc nif_funcs[] = {
{"ec_key_generate", 1, ec_key_generate},
{"ecdsa_sign_nif", 4, ecdsa_sign_nif},
{"ecdsa_verify_nif", 5, ecdsa_verify_nif},
- {"ecdh_compute_key_nif", 3, ecdh_compute_key_nif}
+ {"ecdh_compute_key_nif", 3, ecdh_compute_key_nif},
+
+ {"rand_seed_nif", 1, rand_seed_nif}
};
ERL_NIF_INIT(crypto,nif_funcs,load,NULL,upgrade,unload)
@@ -3374,6 +3378,15 @@ out_err:
#endif
}
+static ERL_NIF_TERM rand_seed_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+ ErlNifBinary seed_bin;
+ if (!enif_inspect_binary(env, argv[0], &seed_bin))
+ return enif_make_badarg(env);
+ RAND_seed(seed_bin.data,seed_bin.size);
+ return atom_ok;
+}
+
/* HMAC */
diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml
index 40f829e704..952808d9db 100644
--- a/lib/crypto/doc/src/crypto.xml
+++ b/lib/crypto/doc/src/crypto.xml
@@ -552,6 +552,21 @@
</desc>
</func>
+ <func>
+ <name>rand_seed(Seed) -> ok</name>
+ <fsummary>Set the seed for random bytes generation</fsummary>
+ <type>
+ <v>Seed = binary()</v>
+ </type>
+ <desc>
+ <p>Set the seed for PRNG to the given binary. This calls the
+ RAND_seed function from openssl. Only use this if the system
+ you are running on does not have enough "randomness" built in.
+ Normally this is when <seealso marker="#strong_rand_bytes/1">
+ stong_rand_bytes/1</seealso> returns <c>low_entropy</c></p>
+ </desc>
+ </func>
+
<func>
<name>rand_uniform(Lo, Hi) -> N</name>
<fsummary>Generate a random number</fsummary>