diff --git a/tests/src/helpers.c b/tests/src/helpers.c
index 2258e55..b5ca1f8 100644
--- a/tests/src/helpers.c
+++ b/tests/src/helpers.c
@@ -17,3 +17,132 @@
  */
 
 #include <test/helpers.h>
+#include <test/macros.h>
+#include <string.h>
+
+#if defined(MBEDTLS_PLATFORM_C)
+static mbedtls_platform_context platform_ctx;
+#endif
+
+int platform_setup( void )
+{
+    int ret = 0;
+#if defined(MBEDTLS_PLATFORM_C)
+    ret = mbedtls_platform_setup( &platform_ctx );
+#endif /* MBEDTLS_PLATFORM_C */
+    return( ret );
+}
+
+void platform_teardown( void )
+{
+#if defined(MBEDTLS_PLATFORM_C)
+    mbedtls_platform_teardown( &platform_ctx );
+#endif /* MBEDTLS_PLATFORM_C */
+}
+
+int unhexify( unsigned char *obuf, const char *ibuf )
+{
+    unsigned char c, c2;
+    int len = strlen( ibuf ) / 2;
+    TEST_HELPER_ASSERT( strlen( ibuf ) % 2 == 0 ); /* must be even number of bytes */
+
+    while( *ibuf != 0 )
+    {
+        c = *ibuf++;
+        if( c >= '0' && c <= '9' )
+            c -= '0';
+        else if( c >= 'a' && c <= 'f' )
+            c -= 'a' - 10;
+        else if( c >= 'A' && c <= 'F' )
+            c -= 'A' - 10;
+        else
+            TEST_HELPER_ASSERT( 0 );
+
+        c2 = *ibuf++;
+        if( c2 >= '0' && c2 <= '9' )
+            c2 -= '0';
+        else if( c2 >= 'a' && c2 <= 'f' )
+            c2 -= 'a' - 10;
+        else if( c2 >= 'A' && c2 <= 'F' )
+            c2 -= 'A' - 10;
+        else
+            TEST_HELPER_ASSERT( 0 );
+
+        *obuf++ = ( c << 4 ) | c2;
+    }
+
+    return len;
+}
+
+void hexify( unsigned char *obuf, const unsigned char *ibuf, int len )
+{
+    unsigned char l, h;
+
+    while( len != 0 )
+    {
+        h = *ibuf / 16;
+        l = *ibuf % 16;
+
+        if( h < 10 )
+            *obuf++ = '0' + h;
+        else
+            *obuf++ = 'a' + h - 10;
+
+        if( l < 10 )
+            *obuf++ = '0' + l;
+        else
+            *obuf++ = 'a' + l - 10;
+
+        ++ibuf;
+        len--;
+    }
+}
+
+unsigned char *zero_alloc( size_t len )
+{
+    void *p;
+    size_t actual_len = ( len != 0 ) ? len : 1;
+
+    p = mbedtls_calloc( 1, actual_len );
+    TEST_HELPER_ASSERT( p != NULL );
+
+    memset( p, 0x00, actual_len );
+
+    return( p );
+}
+
+unsigned char *unhexify_alloc( const char *ibuf, size_t *olen )
+{
+    unsigned char *obuf;
+
+    *olen = strlen( ibuf ) / 2;
+
+    if( *olen == 0 )
+        return( zero_alloc( *olen ) );
+
+    obuf = mbedtls_calloc( 1, *olen );
+    TEST_HELPER_ASSERT( obuf != NULL );
+
+    (void) unhexify( obuf, ibuf );
+
+    return( obuf );
+}
+
+int hexcmp( uint8_t * a, uint8_t * b, uint32_t a_len, uint32_t b_len )
+{
+    int ret = 0;
+    uint32_t i = 0;
+
+    if( a_len != b_len )
+        return( -1 );
+
+    for( i = 0; i < a_len; i++ )
+    {
+        if( a[i] != b[i] )
+        {
+            ret = -1;
+            break;
+        }
+    }
+    return ret;
+}