Import gcrypt public-key cryptography and implement signature checking.

grub-core/lib/libgcrypt/src/hmac256.h

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+/* hmac256.h - Declarations for _gcry_hmac256
+ *	Copyright (C) 2008 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HMAC256_H
+#define HMAC256_H
+
+
+struct hmac256_context;
+typedef struct hmac256_context *hmac256_context_t;
+
+hmac256_context_t _gcry_hmac256_new (const void *key, size_t keylen);
+void _gcry_hmac256_update (hmac256_context_t hd, const void *buf, size_t len);
+const void *_gcry_hmac256_finalize (hmac256_context_t hd, size_t *r_dlen);
+void _gcry_hmac256_release (hmac256_context_t hd);
+
+int _gcry_hmac256_file (void *result, size_t resultsize, const char *filename,
+                        const void *key, size_t keylen);
+
+
+#endif /*HMAC256_H*/