- Added support for Hardware Acceleration hooking in SSL/TLS

ChangeLog

@@ -16,6 +16,7 @@ Features
    * Added TLS 1.2 support
    * Added GCM suites to TLS 1.2 (RFC 5288)
    * Added commandline error code convertor (util/strerror)
+   * Added support for Hardware Acceleration hooking in SSL/TLS
 
 Changes
    * Removed redundant POLARSSL_DEBUG_MSG define

include/polarssl/config.h

@@ -228,6 +228,16 @@
  */
 #define POLARSSL_SELF_TEST
 
+/**
+ * \def POLARSSL_SSL_HW_RECORD_ACCEL
+ *
+ * Enable hooking functions in SSL module for hardware acceleration of
+ * individual records.
+ *
+ * Uncomment this macro to enable hooking functions.
+#define POLARSSL_SSL_HW_RECORD_ACCEL
+ */
+
 /**
  * \def POLARSSL_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
  *

include/polarssl/error.h

@@ -75,7 +75,8 @@
  * RSA      4   9
  * MD       5   4
  * CIPHER   6   5
- * SSL      7   30
+ * SSL      6   1 (Started from top)
+ * SSL      7   31
  *
  * Module dependent error code (5 bits 0x.08.-0x.F8.)
  */

include/polarssl/ssl.h

@@ -84,6 +84,8 @@
 #define POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC         -0x7E00  /**< Processing of the ChangeCipherSpec handshake message failed. */
 #define POLARSSL_ERR_SSL_BAD_HS_FINISHED                   -0x7E80  /**< Processing of the Finished handshake message failed. */
 #define POLARSSL_ERR_SSL_MALLOC_FAILED                     -0x7F00  /**< Memory allocation failed */
+#define POLARSSL_ERR_SSL_HW_ACCEL_FAILED                   -0x7F80  /**< Hardware acceleration function returned with error */
+#define POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH              -0x6F80  /**< Hardware acceleration function skipped / left alone data */
 
 /*
  * Various constants
@@ -385,6 +387,17 @@ extern "C" {
 
 extern int ssl_default_ciphersuites[];
 
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+extern int (*ssl_hw_record_init)(ssl_context *ssl,
+                const unsigned char *key_enc, const unsigned char *key_dec,
+                const unsigned char *iv_enc,  const unsigned char *iv_dec,
+                const unsigned char *mac_enc, const unsigned char *mac_dec);
+extern int (*ssl_hw_record_reset)(ssl_context *ssl);
+extern int (*ssl_hw_record_write)(ssl_context *ssl);
+extern int (*ssl_hw_record_read)(ssl_context *ssl);
+extern int (*ssl_hw_record_finish)(ssl_context *ssl);
+#endif
+
 /**
  * \brief Returns the list of ciphersuites supported by the SSL/TLS module.
  *

library/error.c

@@ -169,7 +169,7 @@ void error_strerror( int ret, char *buf, size_t buflen )
         if( use_ret == -(POLARSSL_ERR_DHM_READ_PUBLIC_FAILED) )
             snprintf( buf, buflen, "DHM - Reading of the public values failed" );
         if( use_ret == -(POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED) )
-            snprintf( buf, buflen, "DHM - Makeing of the public value failed" );
+            snprintf( buf, buflen, "DHM - Making of the public value failed" );
         if( use_ret == -(POLARSSL_ERR_DHM_CALC_SECRET_FAILED) )
             snprintf( buf, buflen, "DHM - Calculation of the DHM secret failed" );
 #endif /* POLARSSL_DHM_C */
@@ -286,6 +286,10 @@ void error_strerror( int ret, char *buf, size_t buflen )
             snprintf( buf, buflen, "SSL - Processing of the Finished handshake message failed" );
         if( use_ret == -(POLARSSL_ERR_SSL_MALLOC_FAILED) )
             snprintf( buf, buflen, "SSL - Memory allocation failed" );
+        if( use_ret == -(POLARSSL_ERR_SSL_HW_ACCEL_FAILED) )
+            snprintf( buf, buflen, "SSL - Hardware acceleration function returned with error" );
+        if( use_ret == -(POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH) )
+            snprintf( buf, buflen, "SSL - Hardware acceleration function skipped / left alone data" );
 #endif /* POLARSSL_SSL_TLS_C */
 
 #if defined(POLARSSL_X509_PARSE_C)

library/ssl_tls.c

@@ -54,6 +54,17 @@
 #define strcasecmp _stricmp
 #endif
 
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+int (*ssl_hw_record_init)(ssl_context *ssl,
+                       const unsigned char *key_enc, const unsigned char *key_dec,
+                       const unsigned char *iv_enc,  const unsigned char *iv_dec,
+                       const unsigned char *mac_enc, const unsigned char *mac_dec) = NULL;
+int (*ssl_hw_record_reset)(ssl_context *ssl) = NULL;
+int (*ssl_hw_record_write)(ssl_context *ssl) = NULL;
+int (*ssl_hw_record_read)(ssl_context *ssl) = NULL;
+int (*ssl_hw_record_finish)(ssl_context *ssl) = NULL;
+#endif
+
 /*
  * Key material generation
  */
@@ -520,6 +531,23 @@ int ssl_derive_keys( ssl_context *ssl )
                 iv_copy_len );
     }
 
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+    if( ssl_hw_record_init != NULL)
+    {
+        int ret = 0;
+
+        SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_init()" ) );
+
+        if( ( ret = ssl_hw_record_init( ssl, key1, key2, ssl->iv_enc,
+                                        ssl->iv_dec, ssl->mac_enc,
+                                        ssl->mac_dec ) ) != 0 )
+        {
+            SSL_DEBUG_RET( 1, "ssl_hw_record_init", ret );
+            return POLARSSL_ERR_SSL_HW_ACCEL_FAILED;
+        }
+    }
+#endif
+
     switch( ssl->session->ciphersuite )
     {
 #if defined(POLARSSL_ARC4_C)
@@ -1422,17 +1450,11 @@ int ssl_flush_output( ssl_context *ssl )
  */
 int ssl_write_record( ssl_context *ssl )
 {
-    int ret;
+    int ret, done = 0;
     size_t len = ssl->out_msglen;
 
     SSL_DEBUG_MSG( 2, ( "=> write record" ) );
 
-    ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
-    ssl->out_hdr[1] = (unsigned char) ssl->major_ver;
-    ssl->out_hdr[2] = (unsigned char) ssl->minor_ver;
-    ssl->out_hdr[3] = (unsigned char)( len >> 8 );
-    ssl->out_hdr[4] = (unsigned char)( len      );
-
     if( ssl->out_msgtype == SSL_MSG_HANDSHAKE )
     {
         ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
@@ -1442,6 +1464,28 @@ int ssl_write_record( ssl_context *ssl )
         ssl->update_checksum( ssl, ssl->out_msg, len );
     }
 
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+    if( ssl_hw_record_write != NULL)
+    {
+        SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_write()" ) );
+
+        ret = ssl_hw_record_write( ssl );
+        if( ret != 0 && ret != POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH )
+        {
+            SSL_DEBUG_RET( 1, "ssl_hw_record_write", ret );
+            return POLARSSL_ERR_SSL_HW_ACCEL_FAILED;
+        }
+        done = 1;
+    }
+#endif
+    if( !done )
+    {
+        ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
+        ssl->out_hdr[1] = (unsigned char) ssl->major_ver;
+        ssl->out_hdr[2] = (unsigned char) ssl->minor_ver;
+        ssl->out_hdr[3] = (unsigned char)( len >> 8 );
+        ssl->out_hdr[4] = (unsigned char)( len      );
+
         if( ssl->do_crypt != 0 )
         {
             if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
@@ -1464,6 +1508,7 @@ int ssl_write_record( ssl_context *ssl )
 
         SSL_DEBUG_BUF( 4, "output record sent to network",
                        ssl->out_hdr, 5 + ssl->out_msglen );
+    }
 
     if( ( ret = ssl_flush_output( ssl ) ) != 0 )
     {
@@ -1478,7 +1523,7 @@ int ssl_write_record( ssl_context *ssl )
 
 int ssl_read_record( ssl_context *ssl )
 {
-    int ret;
+    int ret, done = 0;
 
     SSL_DEBUG_MSG( 2, ( "=> read record" ) );
 
@@ -1598,7 +1643,21 @@ int ssl_read_record( ssl_context *ssl )
     SSL_DEBUG_BUF( 4, "input record from network",
                    ssl->in_hdr, 5 + ssl->in_msglen );
 
-    if( ssl->do_crypt != 0 )
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+    if( ssl_hw_record_read != NULL)
+    {
+        SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_read()" ) );
+
+        ret = ssl_hw_record_read( ssl );
+        if( ret != 0 && ret != POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH )
+        {
+            SSL_DEBUG_RET( 1, "ssl_hw_record_read", ret );
+            return POLARSSL_ERR_SSL_HW_ACCEL_FAILED;
+        }
+        done = 1;
+    }
+#endif
+    if( !done && ssl->do_crypt != 0 )
     {
         if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
         {
@@ -2458,6 +2517,14 @@ void ssl_session_reset( ssl_context *ssl )
     memset( ssl->ctx_dec, 0, 128 );
 
     ssl->update_checksum = ssl_update_checksum_start;
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+    if( ssl_hw_record_reset != NULL)
+    {
+        SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_reset()" ) );
+        ssl_hw_record_reset( ssl );
+    }
+#endif
 }
 
 /*
@@ -3157,6 +3224,14 @@ void ssl_free( ssl_context *ssl )
         ssl->hostname_len = 0;
     }
 
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+    if( ssl_hw_record_finish != NULL )
+    {
+        SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_finish()" ) );
+        ssl_hw_record_finish( ssl );
+    }
+#endif
+
     SSL_DEBUG_MSG( 2, ( "<= free" ) );
 
     /* Actually free after last debug message */