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+/* 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_CIPHER_EXTRA_INTERNAL_H
+#define OPENSSL_HEADER_CIPHER_EXTRA_INTERNAL_H
+
+#include <openssl/base.h>
+
+#include "../internal.h"
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// EVP_tls_cbc_get_padding determines the padding from the decrypted, TLS, CBC
+// record in |in|. This decrypted record should not include any "decrypted"
+// explicit IV. If the record is publicly invalid, it returns zero. Otherwise,
+// it returns one and sets |*out_padding_ok| to all ones (0xfff..f) if the
+// padding is valid and zero otherwise. It then sets |*out_len| to the length
+// with the padding removed or |in_len| if invalid.
+//
+// If the function returns one, it runs in time independent of the contents of
+// |in|. It is also guaranteed that |*out_len| >= |mac_size|, satisfying
+// |EVP_tls_cbc_copy_mac|'s precondition.
+int EVP_tls_cbc_remove_padding(crypto_word_t *out_padding_ok, size_t *out_len,
+ const uint8_t *in, size_t in_len,
+ size_t block_size, size_t mac_size);
+
+// EVP_tls_cbc_copy_mac copies |md_size| bytes from the end of the first
+// |in_len| bytes of |in| to |out| in constant time (independent of the concrete
+// value of |in_len|, which may vary within a 256-byte window). |in| must point
+// to a buffer of |orig_len| bytes.
+//
+// On entry:
+// orig_len >= in_len >= md_size
+// md_size <= EVP_MAX_MD_SIZE
+void EVP_tls_cbc_copy_mac(uint8_t *out, size_t md_size, const uint8_t *in,
+ size_t in_len, size_t orig_len);
+
+// EVP_tls_cbc_record_digest_supported returns 1 iff |md| is a hash function
+// which EVP_tls_cbc_digest_record supports.
+int EVP_tls_cbc_record_digest_supported(const EVP_MD *md);
+
+// EVP_tls_cbc_digest_record computes the MAC of a decrypted, padded TLS
+// record.
+//
+// md: the hash function used in the HMAC.
+// EVP_tls_cbc_record_digest_supported must return true for this hash.
+// md_out: the digest output. At most EVP_MAX_MD_SIZE bytes will be written.
+// md_out_size: the number of output bytes is written here.
+// header: the 13-byte, TLS record header.
+// data: the record data itself
+// data_plus_mac_size: the secret, reported length of the data and MAC
+// once the padding has been removed.
+// data_plus_mac_plus_padding_size: the public length of the whole
+// record, including padding.
+//
+// On entry: by virtue of having been through one of the remove_padding
+// functions, above, we know that data_plus_mac_size is large enough to contain
+// a padding byte and MAC. (If the padding was invalid, it might contain the
+// padding too. )
+int EVP_tls_cbc_digest_record(const EVP_MD *md, uint8_t *md_out,
+ size_t *md_out_size, const uint8_t header[13],
+ const uint8_t *data, size_t data_plus_mac_size,
+ size_t data_plus_mac_plus_padding_size,
+ const uint8_t *mac_secret,
+ unsigned mac_secret_length);
+
+
+#if defined(__cplusplus)
+} // extern C
+#endif
+
+#endif // OPENSSL_HEADER_CIPHER_EXTRA_INTERNAL_H
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