From d3507e3ea697be7aab4e9344c379d6b277cf81cf Mon Sep 17 00:00:00 2001
From: nahi <nahi@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 1 Sep 2011 07:42:29 +0000
Subject: * Release GVL while OpenSSL's public key generation.

    t = Thread.new { print "."; sleep 0.1 }
    key = OpenSSL::PKey::RSA.new(2048)
    #=> Thread t works in parallel with public key generation if
        OS/machine allows it.

  This works with OpenSSL >= 0.9.8. From this version, it has new
  public key generation function which allows us to interrupt the
  execution while pkey generation iterations.

* ext/openssl/extconf.rb: Check existence of OpenSSL's new public key
  generation function. (DH_generate_parameters_ex,
  DSA_generate_parameters_ex and RSA_generate_key_ex.

* ext/openssl/ossl_pkey.{h,c} (ossl_generate_cb_2,
  ossl_generate_cb_stop): Added new callback function for OpenSSL pkey
  generation which handles Thread interruption by Ruby.
  ossl_generate_cb_stop is the unblock function(ubf) for Ruby which
  sets a stop flag. New pkey generation callback ossl_generate_cb_2
  checks the stop flag at each iterations of OpenSSL and interrupts
  pkey generation when the flag is set.

* ext/openssl/ossl_pkey_dsa.c (dsa_generate): Call
  rb_thread_blocking_region with the above unblock function to release
  GVL while pkey generation.

* ext/openssl/ossl_pkey_rsa.c (rsa_generate): ditto.

* ext/openssl/ossl_pkey_dh.c (dh_generate): ditto.

* test/openssl/test_pkey_{dh,dsa,rsa}.rb: Test it.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33155 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/openssl/ossl_pkey_dsa.c | 63 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 61 insertions(+), 2 deletions(-)

(limited to 'ext/openssl/ossl_pkey_dsa.c')

diff --git a/ext/openssl/ossl_pkey_dsa.c b/ext/openssl/ossl_pkey_dsa.c
index 6b10e8fdf8..3339c1dfc6 100644
--- a/ext/openssl/ossl_pkey_dsa.c
+++ b/ext/openssl/ossl_pkey_dsa.c
@@ -75,9 +75,68 @@ ossl_dsa_new(EVP_PKEY *pkey)
 /*
  * Private
  */
+#if defined(HAVE_DSA_GENERATE_PARAMETERS_EX) && HAVE_BN_GENCB
+struct dsa_blocking_gen_arg {
+    DSA *dsa;
+    int size;
+    unsigned char* seed;
+    int seed_len;
+    int *counter;
+    unsigned long *h;
+    BN_GENCB *cb;
+    int result;
+};
+
+static void
+dsa_blocking_gen(void *arg)
+{
+    struct dsa_blocking_gen_arg *gen = (struct dsa_blocking_gen_arg *)arg;
+    gen->result = DSA_generate_parameters_ex(gen->dsa, gen->size, gen->seed, gen->seed_len, gen->counter, gen->h, gen->cb);
+}
+#endif
+
 static DSA *
 dsa_generate(int size)
 {
+#if defined(HAVE_DSA_GENERATE_PARAMETERS_EX) && HAVE_BN_GENCB
+    BN_GENCB cb;
+    struct ossl_generate_cb_arg cb_arg;
+    struct dsa_blocking_gen_arg gen_arg;
+    DSA *dsa = DSA_new();
+    unsigned char seed[20];
+    int seed_len = 20, counter;
+    unsigned long h;
+
+    if (!dsa) return 0;
+    if (!RAND_bytes(seed, seed_len)) {
+	DSA_free(dsa);
+	return 0;
+    }
+
+    memset(&cb_arg, 0, sizeof(struct ossl_generate_cb_arg));
+    if (rb_block_given_p())
+	cb_arg.yield = 1;
+    BN_GENCB_set(&cb, ossl_generate_cb_2, &cb_arg);
+    gen_arg.dsa = dsa;
+    gen_arg.size = size;
+    gen_arg.seed = seed;
+    gen_arg.seed_len = seed_len;
+    gen_arg.counter = &counter;
+    gen_arg.h = &h;
+    gen_arg.cb = &cb;
+    if (cb_arg.yield == 1) {
+	/* we cannot release GVL when callback proc is supplied */
+	dsa_blocking_gen(&gen_arg);
+    } else {
+	/* there's a chance to unblock */
+	rb_thread_blocking_region(dsa_blocking_gen, &gen_arg, ossl_generate_cb_stop, &cb_arg);
+    }
+    if (!gen_arg.result) {
+	DSA_free(dsa);
+	if (cb_arg.state) rb_jump_tag(cb_arg.state);
+	return 0;
+    }
+#else
     DSA *dsa;
     unsigned char seed[20];
     int seed_len = 20, counter;
@@ -87,9 +146,9 @@ dsa_generate(int size)
 	return 0;
     }
     dsa = DSA_generate_parameters(size, seed, seed_len, &counter, &h,
-	    rb_block_given_p() ? ossl_generate_cb : NULL,
-	    NULL);
+	    rb_block_given_p() ? ossl_generate_cb : NULL, NULL);
     if(!dsa) return 0;
+#endif
 
     if (!DSA_generate_key(dsa)) {
 	DSA_free(dsa);
-- 
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