| /* 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 |
