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diff --git a/library/md_wrap.h b/library/md_wrap.h
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+/**
+ * \file md_wrap.h
+ *
+ * \brief Message digest wrappers.
+ *
+ * \warning This in an internal header. Do not include directly.
+ *
+ * \author Adriaan de Jong <dejong@fox-it.com>
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed 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.
+ */
+#ifndef MBEDTLS_MD_WRAP_H
+#define MBEDTLS_MD_WRAP_H
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/md.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Message digest information.
+ * Allows message digest functions to be called in a generic way.
+ */
+struct mbedtls_md_info_t
+{
+    /** Name of the message digest */
+    const char * name;
+
+    /** Digest identifier */
+    mbedtls_md_type_t type;
+
+    /** Output length of the digest function in bytes */
+    unsigned char size;
+
+    /** Block length of the digest function in bytes */
+    unsigned char block_size;
+};
+
+#if defined(MBEDTLS_MD5_C)
+extern const mbedtls_md_info_t mbedtls_md5_info;
+#endif
+#if defined(MBEDTLS_RIPEMD160_C)
+extern const mbedtls_md_info_t mbedtls_ripemd160_info;
+#endif
+#if defined(MBEDTLS_SHA1_C)
+extern const mbedtls_md_info_t mbedtls_sha1_info;
+#endif
+#if defined(MBEDTLS_SHA224_C)
+extern const mbedtls_md_info_t mbedtls_sha224_info;
+#endif
+#if defined(MBEDTLS_SHA256_C)
+extern const mbedtls_md_info_t mbedtls_sha256_info;
+#endif
+#if defined(MBEDTLS_SHA384_C)
+extern const mbedtls_md_info_t mbedtls_sha384_info;
+#endif
+#if defined(MBEDTLS_SHA512_C)
+extern const mbedtls_md_info_t mbedtls_sha512_info;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MBEDTLS_MD_WRAP_H */