Sync with tfcipher

[tfcrypt.git] / tfdef.h

diff --git a/tfdef.h b/tfdef.h
index 2eac9f8c240d46a16f2df37d223432e8e2e5853e..0facb028e2999dc74a1c804ba5cd9911c08e6ab4 100644 (file)
--- a/tfdef.h
+++ b/tfdef.h
@@ -92,6 +92,18 @@ static inline void data_to_words(void *p, size_t l)
 #endif
 }
 
+static inline void xor_block(void *dst, const void *src, size_t sz)
+{
+       const size_t *sx = (const size_t *)src;
+       const TF_BYTE_TYPE *usx = (const TF_BYTE_TYPE *)src;
+       size_t *dx = (size_t *)dst;
+       TF_BYTE_TYPE *udx = (TF_BYTE_TYPE *)dst;
+       size_t sl = sz;
+
+       for (sl = 0; sl < (sz / sizeof(size_t)); sl++) dx[sl] ^= sx[sl];
+       if (sz - (sl * sizeof(size_t))) for (sl *= sizeof(size_t); sl < sz; sl++) udx[sl] ^= usx[sl];
+}
+
 static inline void ctr_inc(TF_UNIT_TYPE *x, size_t xl)
 {
        size_t z;