1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
57 #ifndef OPENSSL_HEADER_CIPHER_EXTRA_INTERNAL_H
58 #define OPENSSL_HEADER_CIPHER_EXTRA_INTERNAL_H
60 #include <openssl/base.h>
62 #include "../internal.h"
64 #if defined(__cplusplus)
69 // EVP_tls_cbc_get_padding determines the padding from the decrypted, TLS, CBC
70 // record in |in|. This decrypted record should not include any "decrypted"
71 // explicit IV. If the record is publicly invalid, it returns zero. Otherwise,
72 // it returns one and sets |*out_padding_ok| to all ones (0xfff..f) if the
73 // padding is valid and zero otherwise. It then sets |*out_len| to the length
74 // with the padding removed or |in_len| if invalid.
76 // If the function returns one, it runs in time independent of the contents of
77 // |in|. It is also guaranteed that |*out_len| >= |mac_size|, satisfying
78 // |EVP_tls_cbc_copy_mac|'s precondition.
79 int EVP_tls_cbc_remove_padding(crypto_word_t *out_padding_ok, size_t *out_len,
80 const uint8_t *in, size_t in_len,
81 size_t block_size, size_t mac_size);
83 // EVP_tls_cbc_copy_mac copies |md_size| bytes from the end of the first
84 // |in_len| bytes of |in| to |out| in constant time (independent of the concrete
85 // value of |in_len|, which may vary within a 256-byte window). |in| must point
86 // to a buffer of |orig_len| bytes.
89 // orig_len >= in_len >= md_size
90 // md_size <= EVP_MAX_MD_SIZE
91 void EVP_tls_cbc_copy_mac(uint8_t *out, size_t md_size, const uint8_t *in,
92 size_t in_len, size_t orig_len);
94 // EVP_tls_cbc_record_digest_supported returns 1 iff |md| is a hash function
95 // which EVP_tls_cbc_digest_record supports.
96 int EVP_tls_cbc_record_digest_supported(const EVP_MD *md);
98 // EVP_tls_cbc_digest_record computes the MAC of a decrypted, padded TLS
101 // md: the hash function used in the HMAC.
102 // EVP_tls_cbc_record_digest_supported must return true for this hash.
103 // md_out: the digest output. At most EVP_MAX_MD_SIZE bytes will be written.
104 // md_out_size: the number of output bytes is written here.
105 // header: the 13-byte, TLS record header.
106 // data: the record data itself
107 // data_plus_mac_size: the secret, reported length of the data and MAC
108 // once the padding has been removed.
109 // data_plus_mac_plus_padding_size: the public length of the whole
110 // record, including padding.
112 // On entry: by virtue of having been through one of the remove_padding
113 // functions, above, we know that data_plus_mac_size is large enough to contain
114 // a padding byte and MAC. (If the padding was invalid, it might contain the
116 int EVP_tls_cbc_digest_record(const EVP_MD *md, uint8_t *md_out,
117 size_t *md_out_size, const uint8_t header[13],
118 const uint8_t *data, size_t data_plus_mac_size,
119 size_t data_plus_mac_plus_padding_size,
120 const uint8_t *mac_secret,
121 unsigned mac_secret_length);
124 #if defined(__cplusplus)
128 #endif // OPENSSL_HEADER_CIPHER_EXTRA_INTERNAL_H