1 files changed, 47 insertions, 0 deletions
diff --git a/libblake_blake2s_digest.c b/libblake_blake2s_digest.c
new file mode 100644
index 0000000..d9106a5
--- /dev/null
+++ b/libblake_blake2s_digest.c
@@ -0,0 +1,47 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+static void
+encode_uint32_le(unsigned char *out, uint_least32_t value, size_t bytes)
+{
+	switch (bytes) {
+	default:
+		out[3] = (unsigned char)((value >> 24) & 255);
+		/* fall through */
+	case 3:
+		out[2] = (unsigned char)((value >> 16) & 255);
+		/* fall through */
+	case 2:
+		out[1] = (unsigned char)((value >>  8) & 255);
+		/* fall through */
+	case 1:
+		out[0] = (unsigned char)((value >>  0) & 255);
+		/* fall through */
+	case 0:
+		break;
+	}
+}
+
+void
+libblake_blake2s_digest(struct libblake_blake2s_state *state, void *data_, size_t len,
+                        size_t output_len, unsigned char output[static output_len])
+{
+	unsigned char *data = data_;
+	size_t r, i, j;
+
+	r = libblake_blake2s_update(state, data, len);
+	data = &data[r];
+	len -= r;
+
+	state->f[0] = UINT_LEAST32_C(0xFFFFffff);
+	memset(&data[len], 0, 64 - len);
+
+	state->t[0] = (state->t[0] + len) & UINT_LEAST32_C(0xFFFFffff);
+	if (state->t[0] < len)
+		state->t[1] = (state->t[1] + 1) & UINT_LEAST32_C(0xFFFFffff);
+
+	libblake_internal_blake2s_compress(state, data);
+
+	for (i = 0, j = 0; i < output_len; i += 4, j += 1)
+		encode_uint32_le(&output[i], state->h[j], output_len - i);
+}