--- /dev/null
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * 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 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.] */
+
+#ifndef OPENSSL_HEADER_DIGEST_INTERNAL_H
+#define OPENSSL_HEADER_DIGEST_INTERNAL_H
+
+#include <openssl/base.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+struct env_md_st {
+ // type contains a NID identifing the digest function. (For example,
+ // NID_md5.)
+ int type;
+
+ // md_size contains the size, in bytes, of the resulting digest.
+ unsigned md_size;
+
+ // flags contains the OR of |EVP_MD_FLAG_*| values.
+ uint32_t flags;
+
+ // init initialises the state in |ctx->md_data|.
+ void (*init)(EVP_MD_CTX *ctx);
+
+ // update hashes |len| bytes of |data| into the state in |ctx->md_data|.
+ void (*update)(EVP_MD_CTX *ctx, const void *data, size_t count);
+
+ // final completes the hash and writes |md_size| bytes of digest to |out|.
+ void (*final)(EVP_MD_CTX *ctx, uint8_t *out);
+
+ // block_size contains the hash's native block size.
+ unsigned block_size;
+
+ // ctx_size contains the size, in bytes, of the state of the hash function.
+ unsigned ctx_size;
+};
+
+// evp_md_pctx_ops contains function pointers to allow the |pctx| member of
+// |EVP_MD_CTX| to be manipulated without breaking layering by calling EVP
+// functions.
+struct evp_md_pctx_ops {
+ // free is called when an |EVP_MD_CTX| is being freed and the |pctx| also
+ // needs to be freed.
+ void (*free) (EVP_PKEY_CTX *pctx);
+
+ // dup is called when an |EVP_MD_CTX| is copied and so the |pctx| also needs
+ // to be copied.
+ EVP_PKEY_CTX* (*dup) (EVP_PKEY_CTX *pctx);
+};
+
+
+#if defined(__cplusplus)
+} // extern C
+#endif
+
+#endif // OPENSSL_HEADER_DIGEST_INTERNAL
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