X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=tfdef.h;h=0facb028e2999dc74a1c804ba5cd9911c08e6ab4;hb=427cccc02bf41be626fb70408e172d41fb1176b4;hp=2eac9f8c240d46a16f2df37d223432e8e2e5853e;hpb=c0d678824537239f5e17822cd8473ac32f1ed251;p=tfcrypt.git

diff --git a/tfdef.h b/tfdef.h
index 2eac9f8..0facb02 100644
--- 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;