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diff --git a/lib/libalpm/sha2.h b/lib/libalpm/sha2.h
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+/*
+ * SHA-224 and SHA-256 cryptographic hash function
+ *
+ * Copyright (C) 2006-2010, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _SHA2_H
+#define _SHA2_H
+
+#include <string.h>
+
+/**
+ * \brief SHA-256 context structure
+ */
+typedef struct
+{
+ unsigned long total[2]; /*!< number of bytes processed */
+ unsigned long state[8]; /*!< intermediate digest state */
+ unsigned char buffer[64]; /*!< data block being processed */
+
+ int is224; /*!< 0 => SHA-256, else SHA-224 */
+}
+sha2_context;
+
+/**
+ * \brief Output = SHA-256( input buffer )
+ *
+ * \param input buffer holding the data
+ * \param ilen length of the input data
+ * \param output SHA-224/256 checksum result
+ * \param is224 0 = use SHA256, 1 = use SHA224
+ */
+void sha2( const unsigned char *input, size_t ilen,
+ unsigned char output[32], int is224 );
+
+/**
+ * \brief Output = SHA-256( file contents )
+ *
+ * \param path input file name
+ * \param output SHA-224/256 checksum result
+ * \param is224 0 = use SHA256, 1 = use SHA224
+ *
+ * \return 0 if successful, 1 if fopen failed,
+ * or 2 if fread failed
+ */
+int sha2_file( const char *path, unsigned char output[32], int is224 );
+
+#endif /* sha2.h */