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+/* sha2 implementation by Aaron D. Gifford (http://www.aarongifford.com) */
+
+#ifndef UTIL_SHA_H
+#define UTIL_SHA_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include "utildecl.h"
+
+/* begin of sha2.h */
+
+/*
+ * FILE: sha2.h
+ * AUTHOR: Aaron D. Gifford - http://www.aarongifford.com/
+ *
+ * Copyright (c) 2000-2001, Aaron D. Gifford
+ * 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 copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``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 AUTHOR OR CONTRIBUTOR(S) 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.
+ *
+ * $Id: sha2.h,v 1.1 2001/11/08 00:02:01 adg Exp adg $
+ */
+
+/*** SHA-256/384/512 Various Length Definitions ***********************/
+
+#define SHA256_BLOCK_LENGTH 64
+#define SHA256_DIGEST_LENGTH 32
+#define SHA256_DIGEST_STRING_LENGTH (SHA256_DIGEST_LENGTH * 2 + 1)
+#define SHA384_BLOCK_LENGTH 128
+#define SHA384_DIGEST_LENGTH 48
+#define SHA384_DIGEST_STRING_LENGTH (SHA384_DIGEST_LENGTH * 2 + 1)
+#define SHA512_BLOCK_LENGTH 128
+#define SHA512_DIGEST_LENGTH 64
+#define SHA512_DIGEST_STRING_LENGTH (SHA512_DIGEST_LENGTH * 2 + 1)
+
+typedef struct _SHA256_CTX {
+ uint32_t state[8];
+ uint64_t bitcount;
+ union {
+ uint8_t buffer[SHA256_BLOCK_LENGTH];
+ uint64_t buffer64[SHA256_BLOCK_LENGTH / sizeof(uint64_t)]; // to avoid warnings about violating aliasing rules
+ };
+} SHA256_CTX;
+
+typedef struct _SHA512_CTX {
+ uint64_t state[8];
+ uint64_t bitcount[2];
+ union {
+ uint8_t buffer[SHA512_BLOCK_LENGTH];
+ uint64_t buffer64[SHA512_BLOCK_LENGTH / sizeof(uint64_t)];
+ };
+} SHA512_CTX;
+
+typedef SHA512_CTX SHA384_CTX;
+
+/*** SHA-256/384/512 Function Prototypes ******************************/
+
+/*
+void SHA256_Init(SHA256_CTX *);
+void SHA256_Update(SHA256_CTX*, const u_int8_t*, size_t);
+void SHA256_Final(u_int8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
+char* SHA256_End(SHA256_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
+char* SHA256_Data(const u_int8_t*, size_t, char[SHA256_DIGEST_STRING_LENGTH]);
+
+void SHA384_Init(SHA384_CTX*);
+void SHA384_Update(SHA384_CTX*, const u_int8_t*, size_t);
+void SHA384_Final(u_int8_t[SHA384_DIGEST_LENGTH], SHA384_CTX*);
+char* SHA384_End(SHA384_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
+char* SHA384_Data(const u_int8_t*, size_t, char[SHA384_DIGEST_STRING_LENGTH]);
+
+void SHA512_Init(SHA512_CTX*);
+void SHA512_Update(SHA512_CTX*, const u_int8_t*, size_t);
+void SHA512_Final(u_int8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
+char* SHA512_End(SHA512_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
+char* SHA512_Data(const u_int8_t*, size_t, char[SHA512_DIGEST_STRING_LENGTH]);
+*/
+
+/* end of sha2.h */
+
+#define sha256_state SHA256_CTX
+#define sha384_state SHA384_CTX
+#define sha512_state SHA512_CTX
+
+UTILAPI void sha256_init (sha256_state *state);
+UTILAPI void sha384_init (sha384_state *state);
+UTILAPI void sha512_init (sha512_state *state);
+
+UTILAPI void sha256_add (sha256_state *state, const void *data, size_t size);
+UTILAPI void sha384_add (sha384_state *state, const void *data, size_t size);
+UTILAPI void sha512_add (sha512_state *state, const void *data, size_t size);
+
+UTILAPI void sha256_put (sha256_state *state, uint8_t digest[SHA256_DIGEST_LENGTH]);
+UTILAPI void sha384_put (sha384_state *state, uint8_t digest[SHA384_DIGEST_LENGTH]);
+UTILAPI void sha512_put (sha512_state *state, uint8_t digest[SHA512_DIGEST_LENGTH]);
+
+UTILAPI void sha256 (const void *data, size_t size, uint8_t digest[SHA256_DIGEST_LENGTH]);
+UTILAPI void sha384 (const void *data, size_t size, uint8_t digest[SHA384_DIGEST_LENGTH]);
+UTILAPI void sha512 (const void *data, size_t size, uint8_t digest[SHA512_DIGEST_LENGTH]);
+
+UTILAPI void sha256init (void);
+UTILAPI void sha384init (void);
+UTILAPI void sha512init (void);
+
+UTILAPI void sha256add (const void *data, size_t size);
+UTILAPI void sha384add (const void *data, size_t size);
+UTILAPI void sha512add (const void *data, size_t size);
+
+UTILAPI void sha256put (uint8_t digest[SHA256_DIGEST_LENGTH]);
+UTILAPI void sha384put (uint8_t digest[SHA384_DIGEST_LENGTH]);
+UTILAPI void sha512put (uint8_t digest[SHA512_DIGEST_LENGTH]);
+
+#endif \ No newline at end of file