Add md/shaXXX_clone() API

Will be used in the SSL/TLS modules

library/md2.c

@@ -97,6 +97,12 @@ void mbedtls_md2_free( mbedtls_md2_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_md2_context ) );
 }
 
+void mbedtls_md2_clone( mbedtls_md2_context *dst,
+                        const mbedtls_md2_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * MD2 context setup
  */

library/md4.c

@@ -90,6 +90,12 @@ void mbedtls_md4_free( mbedtls_md4_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_md4_context ) );
 }
 
+void mbedtls_md4_clone( mbedtls_md4_context *dst,
+                        const mbedtls_md4_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * MD4 context setup
  */

library/md5.c

@@ -89,6 +89,12 @@ void mbedtls_md5_free( mbedtls_md5_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_md5_context ) );
 }
 
+void mbedtls_md5_clone( mbedtls_md5_context *dst,
+                        const mbedtls_md5_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * MD5 context setup
  */

library/ripemd160.c

@@ -88,6 +88,12 @@ void mbedtls_ripemd160_free( mbedtls_ripemd160_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_ripemd160_context ) );
 }
 
+void mbedtls_ripemd160_clone( mbedtls_ripemd160_context *dst,
+                        const mbedtls_ripemd160_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * RIPEMD-160 context setup
  */

library/sha1.c

@@ -89,6 +89,12 @@ void mbedtls_sha1_free( mbedtls_sha1_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_sha1_context ) );
 }
 
+void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
+                         const mbedtls_sha1_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * SHA-1 context setup
  */

library/sha256.c

@@ -89,6 +89,12 @@ void mbedtls_sha256_free( mbedtls_sha256_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_sha256_context ) );
 }
 
+void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
+                           const mbedtls_sha256_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * SHA-256 context setup
  */

library/sha512.c

@@ -150,6 +150,12 @@ void mbedtls_sha512_free( mbedtls_sha512_context *ctx )
     mbedtls_zeroize( ctx, sizeof( mbedtls_sha512_context ) );
 }
 
+void mbedtls_sha512_clone( mbedtls_sha512_context *dst,
+                           const mbedtls_sha512_context *src )
+{
+    *dst = *src;
+}
+
 /*
  * SHA-512 context setup
  */