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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * FILE: sha2.h
+ * AUTHOR: Aaron D. Gifford <me@aarongifford.com>
+ *
+ * A licence was granted to the ASF by Aaron on 4 November 2003.
+ */
+
+#ifndef __SHA2_H__
+#define __SHA2_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "apr.h"
+
+/*** SHA-256 Various Length Definitions ***********************/
+#define SHA256_BLOCK_LENGTH 64
+#define SHA256_DIGEST_LENGTH 32
+#define SHA256_DIGEST_STRING_LENGTH (SHA256_DIGEST_LENGTH * 2 + 1)
+
+
+/*** SHA-256/384/512 Context Structures *******************************/
+typedef struct _SHA256_CTX {
+ apr_uint32_t state[8];
+ apr_uint64_t bitcount;
+ apr_byte_t buffer[SHA256_BLOCK_LENGTH];
+} SHA256_CTX;
+
+
+/*** SHA-256/384/512 Function Prototypes ******************************/
+void apr__SHA256_Init(SHA256_CTX *);
+void apr__SHA256_Update(SHA256_CTX *, const apr_byte_t *, size_t);
+void apr__SHA256_Final(apr_byte_t [SHA256_DIGEST_LENGTH], SHA256_CTX *);
+char* apr__SHA256_End(SHA256_CTX *, char [SHA256_DIGEST_STRING_LENGTH]);
+char* apr__SHA256_Data(const apr_byte_t *, size_t,
+ char [SHA256_DIGEST_STRING_LENGTH]);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __SHA2_H__ */
+