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/*
* 'OpenSSL for Ruby' project
* Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz>
*
* All rights reserved.
*
* This program is licensed under the same licence as Ruby.
* (See the file 'LICENCE'.)
*/
#include "ossl.h"
VALUE mRandom;
VALUE eRandomError;
/*
* call-seq:
* seed(str) -> str
*
* ::seed is equivalent to ::add where +entropy+ is length of +str+.
*/
static VALUE
ossl_rand_seed(VALUE self, VALUE str)
{
StringValue(str);
RAND_seed(RSTRING_PTR(str), RSTRING_LENINT(str));
return str;
}
/*
* call-seq:
* add(str, entropy) -> self
*
* Mixes the bytes from +str+ into the Pseudo Random Number Generator(PRNG)
* state.
*
* Thus, if the data from +str+ are unpredictable to an adversary, this
* increases the uncertainty about the state and makes the PRNG output less
* predictable.
*
* The +entropy+ argument is (the lower bound of) an estimate of how much
* randomness is contained in +str+, measured in bytes.
*
* Example:
*
* pid = $$
* now = Time.now
* ary = [now.to_i, now.nsec, 1000, pid]
* OpenSSL::Random.add(ary.join("").to_s, 0.0)
* OpenSSL::Random.seed(ary.join("").to_s)
*/
static VALUE
ossl_rand_add(VALUE self, VALUE str, VALUE entropy)
{
StringValue(str);
RAND_add(RSTRING_PTR(str), RSTRING_LENINT(str), NUM2DBL(entropy));
return self;
}
/*
* call-seq:
* load_random_file(filename) -> true
*
* Reads bytes from +filename+ and adds them to the PRNG.
*/
static VALUE
ossl_rand_load_file(VALUE self, VALUE filename)
{
SafeStringValue(filename);
if(!RAND_load_file(RSTRING_PTR(filename), -1)) {
ossl_raise(eRandomError, NULL);
}
return Qtrue;
}
/*
* call-seq:
* write_random_file(filename) -> true
*
* Writes a number of random generated bytes (currently 1024) to +filename+
* which can be used to initialize the PRNG by calling ::load_random_file in a
* later session.
*/
static VALUE
ossl_rand_write_file(VALUE self, VALUE filename)
{
SafeStringValue(filename);
if (RAND_write_file(RSTRING_PTR(filename)) == -1) {
ossl_raise(eRandomError, NULL);
}
return Qtrue;
}
/*
* call-seq:
* random_bytes(length) -> string
*
* Generates +string+ with +length+ number of cryptographically strong
* pseudo-random bytes.
*
* Example:
*
* OpenSSL::Random.random_bytes(12)
* => "..."
*/
static VALUE
ossl_rand_bytes(VALUE self, VALUE len)
{
VALUE str;
int n = NUM2INT(len);
int ret;
str = rb_str_new(0, n);
ret = RAND_bytes((unsigned char *)RSTRING_PTR(str), n);
if (ret == 0){
char buf[256];
ERR_error_string_n(ERR_get_error(), buf, 256);
ossl_raise(eRandomError, "RAND_bytes error: %s", buf);
} else if (ret == -1) {
ossl_raise(eRandomError, "RAND_bytes is not supported");
}
return str;
}
/*
* call-seq:
* pseudo_bytes(length) -> string
*
* Generates +string+ with +length+ number of pseudo-random bytes.
*
* Pseudo-random byte sequences generated by ::pseudo_bytes will be unique if
* they are of sufficient length, but are not necessarily unpredictable.
*
* Example:
*
* OpenSSL::Random.pseudo_bytes(12)
* => "..."
*/
static VALUE
ossl_rand_pseudo_bytes(VALUE self, VALUE len)
{
VALUE str;
int n = NUM2INT(len);
str = rb_str_new(0, n);
if (!RAND_pseudo_bytes((unsigned char *)RSTRING_PTR(str), n)) {
ossl_raise(eRandomError, NULL);
}
return str;
}
#ifdef HAVE_RAND_EGD
/*
* call-seq:
* egd(filename) -> true
*
* Same as ::egd_bytes but queries 255 bytes by default.
*/
static VALUE
ossl_rand_egd(VALUE self, VALUE filename)
{
SafeStringValue(filename);
if(!RAND_egd(RSTRING_PTR(filename))) {
ossl_raise(eRandomError, NULL);
}
return Qtrue;
}
/*
* call-seq:
* egd_bytes(filename, length) -> true
*
* Queries the entropy gathering daemon EGD on socket path given by +filename+.
*
* Fetches +length+ number of bytes and uses ::add to seed the OpenSSL built-in
* PRNG.
*/
static VALUE
ossl_rand_egd_bytes(VALUE self, VALUE filename, VALUE len)
{
int n = NUM2INT(len);
SafeStringValue(filename);
if (!RAND_egd_bytes(RSTRING_PTR(filename), n)) {
ossl_raise(eRandomError, NULL);
}
return Qtrue;
}
#endif /* HAVE_RAND_EGD */
/*
* call-seq:
* status? => true | false
*
* Return true if the PRNG has been seeded with enough data, false otherwise.
*/
static VALUE
ossl_rand_status(VALUE self)
{
return RAND_status() ? Qtrue : Qfalse;
}
/*
* INIT
*/
void
Init_ossl_rand(void)
{
#if 0
mOSSL = rb_define_module("OpenSSL"); /* let rdoc know about mOSSL */
#endif
mRandom = rb_define_module_under(mOSSL, "Random");
eRandomError = rb_define_class_under(mRandom, "RandomError", eOSSLError);
rb_define_module_function(mRandom, "seed", ossl_rand_seed, 1);
rb_define_module_function(mRandom, "random_add", ossl_rand_add, 2);
rb_define_module_function(mRandom, "load_random_file", ossl_rand_load_file, 1);
rb_define_module_function(mRandom, "write_random_file", ossl_rand_write_file, 1);
rb_define_module_function(mRandom, "random_bytes", ossl_rand_bytes, 1);
rb_define_module_function(mRandom, "pseudo_bytes", ossl_rand_pseudo_bytes, 1);
#ifdef HAVE_RAND_EGD
rb_define_module_function(mRandom, "egd", ossl_rand_egd, 1);
rb_define_module_function(mRandom, "egd_bytes", ossl_rand_egd_bytes, 2);
#endif /* HAVE_RAND_EGD */
rb_define_module_function(mRandom, "status?", ossl_rand_status, 0);
}
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