Rewrite code, but keeping the exact same semantic and behaviourHEADmain

- assert that the generated `siphash.o` code is identical to the
  original code, available at `tests/assert-identical.sh`;
- remove unneeded `#define`s;
- rewrite code with the correct indentation, spacing and formatting;
- use C99 constructs over C89 (for loop variable declarations inside
  the parentheses);
- fix the public API.

1 files changed, 101 insertions, 0 deletions

diff --git a/tests/lib.c b/tests/lib.c
new file mode 100644
index 0000000..acae834
--- /dev/null
+++ b/tests/lib.c
@@ -0,0 +1,101 @@
+#include "../src/lib.c"
+
+#include <assert.h>
+#include <time.h>
+
+
+static int
+test_hash(void) {
+	int rc = -1;
+
+	fprintf(stderr, "hash():\n");
+
+	FILE *f = NULL;
+	size_t read_count;
+
+	const size_t iterations = 100U;
+	u8 *input = NULL;
+
+	f = fopen("/dev/urandom", "r");
+	if (f == NULL) {
+		perror("fopen()");
+		goto out;
+	}
+
+	u8 key[SIPHASH_KEY_LENGTH];
+	read_count = fread(key, sizeof(u8), sizeof(key), f);
+	if (ferror(f)) {
+		perror("fread()");
+		goto out;
+	}
+	assert(read_count == sizeof(key));
+
+	time_t t = time(NULL);
+	if (t == (time_t)-1) {
+		perror("time(NULL)");
+	}
+	srand((unsigned int)t);
+
+	{
+		fprintf(
+			stderr,
+			"\033[0;33mtesting\033[0m: hash() === SipHash-2-4-128 %ld times...",
+			iterations
+		);
+
+		u8    given[SIPHASH_OUTPUT_LENGTH];
+		u8 expected[SIPHASH_OUTPUT_LENGTH];
+		for (u8 i = 0; i < iterations; i++) {
+			const size_t input_size = ((unsigned int)abs(rand())) % 256;
+			input = malloc(input_size);
+			if (input == NULL) {
+				perror("malloc()");
+				goto out;
+			}
+
+			read_count = fread(input, sizeof(u8), input_size, f);
+			if (ferror(f)) {
+				perror("fread()");
+				goto out;
+			}
+			assert(read_count == input_size);
+
+			siphash(key, input_size, input, given);
+			siphash_impl(input, input_size, key, expected, SIPHASH_OUTPUT_LENGTH);
+
+			assert(memcmp(given, expected, SIPHASH_OUTPUT_LENGTH) == 0);
+
+			free(input);
+			input = NULL;
+		}
+
+		fprintf(stderr, " \033[0;32mOK\033[0m\n");
+	}
+
+	rc = 0;
+out:
+	if (f != NULL) {
+		if (fclose(f)) {
+			perror("fclose(f)");
+			rc = -1;
+		}
+	}
+	if (input != NULL) {
+		free(input);
+	}
+	return rc;
+}
+
+int
+main(void) {
+	int rc = -1;
+
+	if (test_hash()) {
+		fprintf(stderr, "test_hash()\n");
+		goto out;
+	}
+
+	rc = 0;
+out:
+	return !!rc;
+}