Merge branch 'pr_1239' into development-proposed

ChangeLog

@@ -116,6 +116,7 @@ Changes
    * Only run AES-192 self-test if AES-192 is available. Fixes #963.
    * Tighten the RSA PKCS#1 v1.5 signature verification code and remove the
      undeclared dependency of the RSA module on the ASN.1 module.
+   * Add mechanism to provide alternative implementation of the DHM module.
 
 = mbed TLS 2.6.0 branch released 2017-08-10
 

include/mbedtls/config.h

@@ -269,6 +269,7 @@
 //#define MBEDTLS_CCM_ALT
 //#define MBEDTLS_CMAC_ALT
 //#define MBEDTLS_DES_ALT
+//#define MBEDTLS_DHM_ALT
 //#define MBEDTLS_GCM_ALT
 //#define MBEDTLS_MD2_ALT
 //#define MBEDTLS_MD4_ALT

include/mbedtls/dhm.h

@@ -23,7 +23,13 @@
 #ifndef MBEDTLS_DHM_H
 #define MBEDTLS_DHM_H
 
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
 #include "bignum.h"
+#if !defined(MBEDTLS_DHM_ALT)
 
 /*
  * DHM Error codes
@@ -291,6 +297,18 @@ int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path );
 #endif /* MBEDTLS_FS_IO */
 #endif /* MBEDTLS_ASN1_PARSE_C */
 
+#ifdef __cplusplus
+}
+#endif
+
+#else /* MBEDTLS_DHM_ALT */
+#include "dhm_alt.h"
+#endif /* MBEDTLS_DHM_ALT */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * \brief          Checkup routine
  *

library/dhm.c

@@ -57,6 +57,7 @@
 #define mbedtls_free       free
 #endif
 
+#if !defined(MBEDTLS_DHM_ALT)
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
@@ -577,6 +578,7 @@ int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path )
 }
 #endif /* MBEDTLS_FS_IO */
 #endif /* MBEDTLS_ASN1_PARSE_C */
+#endif /* MBEDTLS_DHM_ALT */
 
 #if defined(MBEDTLS_SELF_TEST)
 

library/version_features.c

@@ -105,6 +105,9 @@ static const char *features[] = {
 #if defined(MBEDTLS_DES_ALT)
     "MBEDTLS_DES_ALT",
 #endif /* MBEDTLS_DES_ALT */
+#if defined(MBEDTLS_DHM_ALT)
+    "MBEDTLS_DHM_ALT",
+#endif /* MBEDTLS_DHM_ALT */
 #if defined(MBEDTLS_GCM_ALT)
     "MBEDTLS_GCM_ALT",
 #endif /* MBEDTLS_GCM_ALT */