added custom implementation for shred

include/shred/tfcore.h

@@ -0,0 +1,51 @@
+#ifndef _THREEFISH_NOISE_GENERATOR_CIPHER_CORE_HEADER
+#define _THREEFISH_NOISE_GENERATOR_CIPHER_CORE_HEADER
+
+#ifndef _THREEFISH_NOISE_GENERATOR_CIPHER_DEFINITIONS_HEADER
+#error Threefish definitions header is required! Include tfdef.h first.
+#endif
+
+#define ROL(x, s, max) ((x << s) | (x >> (-s & (max-1))))
+#define ROR(x, s, max) ((x >> s) | (x << (-s & (max-1))))
+
+#define KE_MIX(x, y, k1, k2, sl)				\
+	do {							\
+		x += k1;					\
+		y += x;						\
+		y += k2;					\
+		x = ROL(x, sl, TFNG_UNIT_BITS);			\
+		x ^= y;						\
+	} while (0)
+
+#define BE_MIX(x, y, sl)					\
+	do {							\
+		x += y;						\
+		y = ROL(y, sl, TFNG_UNIT_BITS);			\
+		y ^= x;						\
+	} while (0)
+
+#define KD_MIX(x, y, k1, k2, sr)				\
+	do {							\
+		x ^= y;						\
+		x = ROR(x, sr, TFNG_UNIT_BITS);			\
+		y -= x;						\
+		y -= k2;					\
+		x -= k1;					\
+	} while (0)
+
+#define BD_MIX(x, y, sr)					\
+	do {							\
+		y ^= x;						\
+		y = ROR(y, sr, TFNG_UNIT_BITS);			\
+		x -= y;						\
+	} while (0)
+
+enum tfng_rotations
+{
+    TFS_KS01 =  7, TFS_KS02 = 25, TFS_KS03 = 19, TFS_KS04 =  7,
+    TFS_BS01 =  5, TFS_BS02 = 27, TFS_BS03 = 26, TFS_BS04 =  6,
+    TFS_BS05 = 14, TFS_BS06 = 11, TFS_BS07 = 24, TFS_BS08 = 18,
+    TFS_BS09 =  9, TFS_BS10 = 24, TFS_BS11 =  6, TFS_BS12 =  7,
+};
+
+#endif