commit c9965dca278becce5bac9a1d9996c8ecc7154d1d
author Paul Bakker <p.j.bakker@polarssl.org> Sun Sep 29 14:58:17 2013 +0200
committer Paul Bakker <p.j.bakker@polarssl.org> Sun Sep 29 15:02:11 2013 +0200
tree 7812fdc22062747d7ad75b7f24ede45b61ddc30c
parent 1337affc914d87e305fbec144643bcf73c7a48cc

RSA blinding threading support

include/polarssl/rsa.h

diff --git a/include/polarssl/rsa.h b/include/polarssl/rsa.h
index 71fbff2..e7b6191 100644
--- a/include/polarssl/rsa.h
+++ b/include/polarssl/rsa.h
@@ -32,6 +32,10 @@
 #include "bignum.h"
 #include "md.h"
 
+#if defined(POLARSSL_THREADING_C)
+#include "threading.h"
+#endif
+
 /*
  * RSA Error codes
  */
@@ -100,6 +104,9 @@
                                       specified in the md.h header file
                                       for the EME-OAEP and EMSA-PSS
                                       encoding                          */
+#if defined(POLARSSL_THREADING_C)
+    threading_mutex_t mutex;    /*!<  Thread-safety mutex       */
+#endif
 }
 rsa_context;
 

library/rsa.c

diff --git a/library/rsa.c b/library/rsa.c
index 42fea41..1784379 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -54,6 +54,10 @@
 
     ctx->padding = padding;
     ctx->hash_id = hash_id;
+
+#if defined(POLARSSL_THREADING_C)
+    polarssl_mutex_init( &ctx->mutex );
+#endif
 }
 
 #if defined(POLARSSL_GENPRIME)
@@ -298,6 +302,9 @@
                  unsigned char *output )
 {
     int ret;
+#if defined(POLARSSL_THREADING_C)
+    int locked = 0;
+#endif
     size_t olen;
     mpi T, T1, T2;
 
@@ -315,6 +322,10 @@
 #else
     if( f_rng != NULL )
     {
+#if defined(POLARSSL_THREADING_C)
+        polarssl_mutex_lock( &ctx->mutex );
+        locked = 1;
+#endif
         /*
          * Blinding
          * T = T * Vi mod N
@@ -361,7 +372,10 @@
     MPI_CHK( mpi_write_binary( &T, output, olen ) );
 
 cleanup:
-
+#if defined(POLARSSL_THREADING_C)
+    if( locked )
+        polarssl_mutex_unlock( &ctx->mutex );
+#endif
     mpi_free( &T ); mpi_free( &T1 ); mpi_free( &T2 );
 
     if( ret != 0 )
@@ -1330,6 +1344,10 @@
     mpi_free( &ctx->QP ); mpi_free( &ctx->DQ ); mpi_free( &ctx->DP );
     mpi_free( &ctx->Q  ); mpi_free( &ctx->P  ); mpi_free( &ctx->D );
     mpi_free( &ctx->E  ); mpi_free( &ctx->N  );
+
+#if defined(POLARSSL_THREADING_C)
+    polarssl_mutex_free( &ctx->mutex );
+#endif
 }
 
 #if defined(POLARSSL_SELF_TEST)