From 0b1a07c8a70486534526d8967f03e32806da5661 Mon Sep 17 00:00:00 2001
From: Alessandro Ghedini <alessandro@ghedini.me>
Date: Tue, 8 Mar 2016 22:37:01 +0000
Subject: Convert RSA blinding to new multi-threading API

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
---
 crypto/bn/bn_blind.c | 49 ++++++++++++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 17 deletions(-)

(limited to 'crypto/bn/bn_blind.c')

diff --git a/crypto/bn/bn_blind.c b/crypto/bn/bn_blind.c
index a08d821ac3..81b895ce37 100644
--- a/crypto/bn/bn_blind.c
+++ b/crypto/bn/bn_blind.c
@@ -110,6 +110,7 @@
 
 #include <openssl/opensslconf.h>
 #include "internal/cryptlib.h"
+#include "internal/threads.h"
 #include "bn_lcl.h"
 
 #define BN_BLINDING_COUNTER     32
@@ -119,16 +120,13 @@ struct bn_blinding_st {
     BIGNUM *Ai;
     BIGNUM *e;
     BIGNUM *mod;                /* just a reference */
-#if OPENSSL_API_COMPAT < 0x10000000L
-    unsigned long thread_id;    /* added in OpenSSL 0.9.6j and 0.9.7b; used
-                                 * only by crypto/rsa/rsa_eay.c, rsa_lib.c */
-#endif
-    CRYPTO_THREADID tid;
+    CRYPTO_THREAD_ID tid;
     int counter;
     unsigned long flags;
     BN_MONT_CTX *m_ctx;
     int (*bn_mod_exp) (BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                        const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+    CRYPTO_RWLOCK *lock;
 };
 
 BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
@@ -139,12 +137,23 @@ BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
 
     if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
         BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
-        return (NULL);
+        return NULL;
     }
+
+    ret->lock = CRYPTO_THREAD_lock_new();
+    if (ret->lock == NULL) {
+        BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
+        OPENSSL_free(ret);
+        return NULL;
+    }
+
+    BN_BLINDING_set_current_thread(ret);
+
     if (A != NULL) {
         if ((ret->A = BN_dup(A)) == NULL)
             goto err;
     }
+
     if (Ai != NULL) {
         if ((ret->Ai = BN_dup(Ai)) == NULL)
             goto err;
@@ -153,6 +162,7 @@ BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
     /* save a copy of mod in the BN_BLINDING structure */
     if ((ret->mod = BN_dup(mod)) == NULL)
         goto err;
+
     if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0)
         BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
 
@@ -162,11 +172,12 @@ BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
      * use.
      */
     ret->counter = -1;
-    CRYPTO_THREADID_current(&ret->tid);
-    return (ret);
+
+    return ret;
+
  err:
     BN_BLINDING_free(ret);
-    return (NULL);
+    return NULL;
 }
 
 void BN_BLINDING_free(BN_BLINDING *r)
@@ -178,6 +189,7 @@ void BN_BLINDING_free(BN_BLINDING *r)
     BN_free(r->Ai);
     BN_free(r->e);
     BN_free(r->mod);
+    CRYPTO_THREAD_lock_free(r->lock);
     OPENSSL_free(r);
 }
 
@@ -271,21 +283,24 @@ int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
     return (ret);
 }
 
-#if OPENSSL_API_COMPAT < 0x10000000L
-unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *b)
+int BN_BLINDING_is_current_thread(BN_BLINDING *b)
+{
+    return CRYPTO_THREAD_compare_id(CRYPTO_THREAD_get_current_id(), b->tid);
+}
+
+void BN_BLINDING_set_current_thread(BN_BLINDING *b)
 {
-    return b->thread_id;
+    b->tid = CRYPTO_THREAD_get_current_id();
 }
 
-void BN_BLINDING_set_thread_id(BN_BLINDING *b, unsigned long n)
+int BN_BLINDING_lock(BN_BLINDING *b)
 {
-    b->thread_id = n;
+    return CRYPTO_THREAD_write_lock(b->lock);
 }
-#endif
 
-CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *b)
+int BN_BLINDING_unlock(BN_BLINDING *b)
 {
-    return &b->tid;
+    return CRYPTO_THREAD_unlock(b->lock);
 }
 
 unsigned long BN_BLINDING_get_flags(const BN_BLINDING *b)
-- 
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