Add librecrypt_verify

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

1 files changed, 71 insertions, 0 deletions

diff --git a/librecrypt_verify.c b/librecrypt_verify.c
new file mode 100644
index 0000000..18d8cd8
--- /dev/null
+++ b/librecrypt_verify.c
@@ -0,0 +1,71 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+int
+librecrypt_verify(const char *phrase, size_t len, const char *settings, void *reserved)
+{
+	char *hash = NULL;
+	size_t size = 0u;
+	size_t off;
+	ssize_t n;
+	int ret, err;
+
+	n = librecrypt_hash_(NULL, 0u, phrase, len, settings, reserved, ASCII_HASH);
+	if (n < 0) {
+		if (errno == EOVERFLOW)
+			errno = ENOMEM;
+		return -1;
+	}
+
+	off = librecrypt_settings_prefix(hash, NULL, reserved);
+	if (hash[off] == '*') {
+		if ('0'> hash[off + 1u] || hash[off + 1u] > '9') {
+			errno = EINVAL;
+			return -1;
+		}
+	}
+
+	size = (size_t)n + 128u; /* a little extra so the hasher don't need to allocate output scratch */
+	hash = malloc(size);
+	if (!hash)
+		return -1;
+
+	n = librecrypt_hash_(hash, size, phrase, len, settings, reserved, ASCII_HASH);
+	if (n < 0) {
+		err = errno;
+		librecrypt_wipe(hash, size);
+		free(hash);
+		if (err == EOVERFLOW)
+			err = ENOMEM;
+		errno = err;
+		return -1;
+	}
+	if ((size_t)n > size)
+		abort();
+
+	ret = librecrypt_equal(hash, &settings[off]);
+	librecrypt_wipe(hash, size);
+	free(hash);
+	return ret;
+}
+
+
+#else
+
+
+int
+main(void)
+{
+	SET_UP_ALARM();
+	INIT_RESOURCE_TEST();
+
+	/* TODO test */
+
+	STOP_RESOURCE_TEST();
+	return 0;
+}
+
+
+#endif