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diff --git a/src/lib/sha2.h b/src/lib/sha2.h
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+/*
+ * FIPS 180-2 SHA-224/256/384/512 implementation
+ * Last update: 02/02/2007
+ * Issue date:  04/30/2005
+ *
+ * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef SHA2_H
+#define SHA2_H
+
+#include "hash-method.h"
+#include "sha-common.h"
+
+struct sha256_ctx {
+	size_t tot_len;
+	size_t len;
+	unsigned char block[2 * SHA256_BLOCK_SIZE];
+	uint32_t h[8];
+};
+
+struct sha384_ctx {
+	size_t tot_len;
+	size_t len;
+	unsigned char block[2 * SHA384_BLOCK_SIZE];
+	uint64_t h[8];
+};
+
+struct sha512_ctx {
+	size_t tot_len;
+	size_t len;
+	unsigned char block[2 * SHA512_BLOCK_SIZE];
+	uint64_t h[8];
+};
+
+void sha256_init(struct sha256_ctx *ctx);
+void sha256_loop(struct sha256_ctx *ctx, const void *data, size_t len);
+void sha256_result(struct sha256_ctx *ctx,
+		   unsigned char digest[STATIC_ARRAY SHA256_RESULTLEN]);
+
+void sha256_get_digest(const void *data, size_t size,
+		       unsigned char digest[STATIC_ARRAY SHA256_RESULTLEN]);
+
+void sha384_init(struct sha384_ctx *ctx);
+void sha384_loop(struct sha384_ctx *ctx, const void *data, size_t len);
+void sha384_result(struct sha384_ctx *ctx,
+		   unsigned char digest[STATIC_ARRAY SHA384_RESULTLEN]);
+
+void sha384_get_digest(const void *data, size_t size,
+		       unsigned char digest[STATIC_ARRAY SHA384_RESULTLEN]);
+
+void sha512_init(struct sha512_ctx *ctx);
+void sha512_loop(struct sha512_ctx *ctx, const void *data, size_t len);
+void sha512_result(struct sha512_ctx *ctx,
+		   unsigned char digest[STATIC_ARRAY SHA512_RESULTLEN]);
+
+void sha512_get_digest(const void *data, size_t size,
+		       unsigned char digest[STATIC_ARRAY SHA512_RESULTLEN]);
+
+extern const struct hash_method hash_method_sha256;
+extern const struct hash_method hash_method_sha384;
+extern const struct hash_method hash_method_sha512;
+
+#endif /* !SHA2_H */