Implement chunk_to_sequence function

This function converts a given chunk to a variable-length byte sequence.

src/charon-tkm/src/tkm/tkm_utils.c

@@ -16,9 +16,23 @@
 
 #include "tkm_utils.h"
 
+/* Generic variable-length sequence */
+struct sequence_type {
+	uint32_t size;
+	byte_t data[];
+};
+typedef struct sequence_type sequence_type;
+
 void sequence_to_chunk(const byte_t * const first, const uint32_t len,
 		chunk_t * const chunk)
 {
 	*chunk = chunk_alloc(len);
 	memcpy(chunk->ptr, first, len);
 }
+
+void chunk_to_sequence(const chunk_t * const chunk, void *sequence)
+{
+	sequence_type *seq = sequence;
+	seq->size = chunk->len;
+	memcpy(seq->data, chunk->ptr, seq->size);
+}

src/charon-tkm/src/tkm/tkm_utils.h

@@ -30,4 +30,12 @@
 void sequence_to_chunk(const byte_t * const first, const uint32_t len,
 		chunk_t * const chunk);
 
+/**
+ * Convert chunk to variable-length byte sequence.
+ *
+ * @param chunk		pointer to chunk struct
+ * @param sequence	pointer to variable-length sequence
+ */
+void chunk_to_sequence(const chunk_t * const chunk, void *sequence);
+
 #endif /** TKM_UTILS_H_ */

src/charon-tkm/tests/utils_tests.c

@@ -36,10 +36,28 @@ START_TEST(test_sequence_to_chunk)
 }
 END_TEST
 
+START_TEST(test_chunk_to_sequence)
+{
+	chunk_t chunk = chunk_from_thing("ABCDEFGH");
+	key_type key;
+
+	chunk_to_sequence(&chunk, &key);
+	fail_if(key.size != chunk.len, "Seq size mismatch");
+
+	uint32_t i;
+	for (i = 0; i < key.size - 1; i++)
+	{
+		fail_if(key.data[i] != 65 + i, "Data mismatch (1)");
+	}
+	fail_if(key.data[key.size - 1] != 0, "Data mismatch (2)");
+}
+END_TEST
+
 TCase *make_utility_tests(void)
 {
 	TCase *tc = tcase_create("Utility tests");
 	tcase_add_test(tc, test_sequence_to_chunk);
+	tcase_add_test(tc, test_chunk_to_sequence);
 
 	return tc;
 }