Squashed 'contrib/signify/' content from commit a1554a4

git-subtree-dir: contrib/signify
git-subtree-split: a1554a4384c794c004da70bd006ce93101f77426

crypto_api.c

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+/* $OpenBSD: crypto_api.c,v 1.1 2014/01/08 03:59:46 tedu Exp $ */
+/*
+ * Public domain. Author: Ted Unangst <tedu@openbsd.org>
+ * API compatible reimplementation of functions from nacl
+ */
+#include <sys/types.h>
+
+#include <string.h>
+#include <sha2.h>
+
+#include "crypto_api.h"
+
+int
+crypto_hash_sha512(unsigned char *out, const unsigned char *in,
+    unsigned long long inlen)
+{
+	SHA2_CTX ctx;
+
+	SHA512Init(&ctx);
+	SHA512Update(&ctx, in, inlen);
+	SHA512Final(out, &ctx);
+	return 0;
+}
+
+int
+crypto_verify_32(const unsigned char *x, const unsigned char *y)
+{
+	return timingsafe_bcmp(x, y, 32) ? -1 : 0;
+}