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| author | Lukas Larsson <[email protected]> | 2014-02-13 18:14:10 +0100 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2014-02-24 15:16:06 +0100 |
| commit | d58602adef3412b354fd521bbd4bda24a0b1a789 (patch) | |
| tree | f77e5139df373983c15e2eca62943ba6bde927f1 | |
| parent | 3b0eb33f899f361d5006824782e1ef1d16f57e5c (diff) | |
| download | otp-d58602adef3412b354fd521bbd4bda24a0b1a789.tar.gz otp-d58602adef3412b354fd521bbd4bda24a0b1a789.tar.bz2 otp-d58602adef3412b354fd521bbd4bda24a0b1a789.zip | |
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.c | 15 | ||||
| -rw-r--r-- | lib/crypto/doc/src/crypto.xml | 15 |
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> |