First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 72 insertions, 0 deletions

diff --git a/libblake_internal_blakes_digest.c b/libblake_internal_blakes_digest.c
new file mode 100644
index 0000000..79f5528
--- /dev/null
+++ b/libblake_internal_blakes_digest.c
@@ -0,0 +1,72 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+static void
+encode_uint32_be(unsigned char *out, uint_least64_t value)
+{
+	out[0] = (unsigned char)((value >> 24) & 255);
+	out[1] = (unsigned char)((value >> 16) & 255);
+	out[2] = (unsigned char)((value >>  8) & 255);
+	out[3] = (unsigned char)((value >>  0) & 255);
+}
+
+void
+libblake_internal_blakes_digest(struct libblake_blakes_state *state, unsigned char *data, size_t len,
+                                size_t bits, const char *suffix, unsigned char *output, size_t words_out)
+{
+	size_t r, i;
+	unsigned char pad;
+	uint_least32_t t0, t1;
+
+	len += bits >> 3;
+	bits &= 7;
+	if (suffix) {
+		while (*suffix) {
+			data[len] |= (unsigned char)((*suffix++ & 1) << bits++);
+			if (bits == 8) {
+				bits = 0;
+				data[++len] = 0;
+			}
+		}
+	}
+
+	r = libblake_internal_blakes_update(state, data, len);
+	data = &data[r];
+	len -= r;
+
+	pad = 0x80 >> bits;
+	data[len] &= (unsigned char)(255U - (pad - 1U));
+	data[len] |= pad;
+	bits += len << 3;
+
+	t0 = state->t[0] + (uint_least32_t)bits;
+	t1 = state->t[1];
+
+	if (!bits) {
+		state->t[0] = UINT_LEAST32_C(0xFFFFfe00);
+		state->t[1] = UINT_LEAST32_C(0xFFFFffff);
+	} else if (!state->t[0]) {
+		state->t[0] = UINT_LEAST32_C(0xFFFFfe00) + (uint_least32_t)bits;
+		state->t[1] = (state->t[1] - 1) & UINT_LEAST32_C(0xFFFFffff);
+	} else {
+		state->t[1] -= (uint_least32_t)(512U - bits);
+	}
+
+	if (bits < 512 - (1 + 2 * 32)) {
+		memset(&data[len + 1], 0, (512 - 2 * 32) / 8 - 1 - len);
+	} else {
+		memset(&data[len + 1], 0, 512 / 8 - 1 - len);
+		data += libblake_internal_blakes_update(state, data, 512 / 8);
+		state->t[0] = UINT_LEAST32_C(0xFFFFfe00);
+		state->t[1] = UINT_LEAST32_C(0xFFFFffff);
+		memset(data, 0, (512 - 2 * 32) / 8 - len);
+	}
+	if (words_out == 8)
+		data[(512 - 2 * 32) / 8 - 1] |= 1;
+	encode_uint32_be(&data[(512 - 2 * 32) / 8], t1);
+	encode_uint32_be(&data[(512 - 1 * 32) / 8], t0);
+	libblake_internal_blakes_update(state, data, 512 / 8);
+
+	for (i = 0; i < words_out; i++)
+		encode_uint32_be(&output[i * 4], state->h[i]);
+}