Feature/mbedtls (#84)

* try to import mbedtls and build it

* add stubs socket class

* some boilterplate, read and write function implemented

* more boilterplate / current error in handshake because no CA cert is setup

* add something so skip ca verification, can ws curl https://google.com !

* cleanup / close implemented

* tweak CMakefiles

* typo in include

* update readme

* disable unittests

third_party/mbedtls/crypto/tests/suites/test_suite_asn1write.function

@@ -0,0 +1,174 @@
+/* BEGIN_HEADER */
+#include "mbedtls/asn1write.h"
+
+#define GUARD_LEN 4
+#define GUARD_VAL 0x2a
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_ASN1_WRITE_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void mbedtls_asn1_write_octet_string( data_t * str, data_t * asn1,
+                                      int buf_len, int result )
+{
+    int ret;
+    unsigned char buf[150];
+    size_t i;
+    unsigned char *p;
+
+    memset( buf, GUARD_VAL, sizeof( buf ) );
+
+
+    p = buf + GUARD_LEN + buf_len;
+
+    ret = mbedtls_asn1_write_octet_string( &p, buf + GUARD_LEN, str->x, str->len );
+
+    /* Check for buffer overwrite on both sides */
+    for( i = 0; i < GUARD_LEN; i++ )
+    {
+        TEST_ASSERT( buf[i] == GUARD_VAL );
+        TEST_ASSERT( buf[GUARD_LEN + buf_len + i] == GUARD_VAL );
+    }
+
+    if( result >= 0 )
+    {
+        TEST_ASSERT( (size_t) ret == asn1->len );
+        TEST_ASSERT( p + asn1->len == buf + GUARD_LEN + buf_len );
+
+        TEST_ASSERT( memcmp( p, asn1->x, asn1->len ) == 0 );
+    }
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mbedtls_asn1_write_ia5_string( char * str, data_t * asn1,
+                                    int buf_len, int result )
+{
+    int ret;
+    unsigned char buf[150];
+    size_t str_len;
+    size_t i;
+    unsigned char *p;
+
+    memset( buf, GUARD_VAL, sizeof( buf ) );
+
+    str_len = strlen( str );
+
+    p = buf + GUARD_LEN + buf_len;
+
+    ret = mbedtls_asn1_write_ia5_string( &p, buf + GUARD_LEN, str, str_len );
+
+    /* Check for buffer overwrite on both sides */
+    for( i = 0; i < GUARD_LEN; i++ )
+    {
+        TEST_ASSERT( buf[i] == GUARD_VAL );
+        TEST_ASSERT( buf[GUARD_LEN + buf_len + i] == GUARD_VAL );
+    }
+
+    if( result >= 0 )
+    {
+        TEST_ASSERT( (size_t) ret == asn1->len );
+        TEST_ASSERT( p + asn1->len == buf + GUARD_LEN + buf_len );
+
+        TEST_ASSERT( memcmp( p, asn1->x, asn1->len ) == 0 );
+    }
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_ASN1PARSE_C */
+void mbedtls_asn1_write_len( int len, data_t * asn1, int buf_len,
+                             int result )
+{
+    int ret;
+    unsigned char buf[150];
+    unsigned char *p;
+    size_t i;
+    size_t read_len;
+
+    memset( buf, GUARD_VAL, sizeof( buf ) );
+
+    p = buf + GUARD_LEN + buf_len;
+
+    ret = mbedtls_asn1_write_len( &p, buf + GUARD_LEN, (size_t) len );
+
+    TEST_ASSERT( ret == result );
+
+    /* Check for buffer overwrite on both sides */
+    for( i = 0; i < GUARD_LEN; i++ )
+    {
+        TEST_ASSERT( buf[i] == GUARD_VAL );
+        TEST_ASSERT( buf[GUARD_LEN + buf_len + i] == GUARD_VAL );
+    }
+
+    if( result >= 0 )
+    {
+        TEST_ASSERT( p + asn1->len == buf + GUARD_LEN + buf_len );
+
+        TEST_ASSERT( memcmp( p, asn1->x, asn1->len ) == 0 );
+
+        /* Read back with mbedtls_asn1_get_len() to check */
+        ret = mbedtls_asn1_get_len( &p, buf + GUARD_LEN + buf_len, &read_len );
+
+        if( len == 0 )
+        {
+            TEST_ASSERT( ret == 0 );
+        }
+        else
+        {
+            /* Return will be MBEDTLS_ERR_ASN1_OUT_OF_DATA because the rest of
+             * the buffer is missing
+             */
+            TEST_ASSERT( ret == MBEDTLS_ERR_ASN1_OUT_OF_DATA );
+        }
+        TEST_ASSERT( read_len == (size_t) len );
+        TEST_ASSERT( p == buf + GUARD_LEN + buf_len );
+    }
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void test_asn1_write_bitstrings( data_t *bitstring, int bits,
+                                 data_t *expected_asn1, int result,
+                                 int is_named )
+{
+    int ret;
+    size_t i;
+    unsigned char buf[150];
+    unsigned char *p;
+
+    memset( buf, GUARD_VAL, sizeof( buf ) );
+
+    p = buf + GUARD_LEN + expected_asn1->len;
+
+    if ( is_named == 0 )
+    {
+        ret = mbedtls_asn1_write_bitstring( &p,
+                                            buf,
+                                            (unsigned char *)bitstring->x,
+                                            (size_t) bits );
+    }
+    else
+    {
+        ret = mbedtls_asn1_write_named_bitstring( &p,
+                                                  buf,
+                                                  (unsigned char *)bitstring->x,
+                                                  (size_t) bits );
+    }
+    TEST_ASSERT( ret == result );
+
+    /* Check for buffer overwrite on both sides */
+    for( i = 0; i < GUARD_LEN; i++ )
+    {
+        TEST_ASSERT( buf[i] == GUARD_VAL );
+        TEST_ASSERT( buf[GUARD_LEN + expected_asn1->len + i] == GUARD_VAL );
+    }
+
+    if ( result >= 0 )
+    {
+        TEST_ASSERT( memcmp( p, expected_asn1->x, expected_asn1->len ) == 0 );
+    }
+}
+/* END_CASE */