162 lines
7.2 KiB
C
162 lines
7.2 KiB
C
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#ifndef OPENSSL_HEADER_CIPHER_INTERNAL_H
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#define OPENSSL_HEADER_CIPHER_INTERNAL_H
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#include <openssl/base.h>
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#include <openssl/aead.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* EVP_CIPH_MODE_MASK contains the bits of |flags| that represent the mode. */
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#define EVP_CIPH_MODE_MASK 0x3f
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/* EVP_AEAD represents a specific AEAD algorithm. */
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struct evp_aead_st {
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uint8_t key_len;
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uint8_t nonce_len;
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uint8_t overhead;
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uint8_t max_tag_len;
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/* init initialises an |EVP_AEAD_CTX|. If this call returns zero then
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* |cleanup| will not be called for that context. */
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int (*init)(EVP_AEAD_CTX *, const uint8_t *key, size_t key_len,
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size_t tag_len);
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int (*init_with_direction)(EVP_AEAD_CTX *, const uint8_t *key, size_t key_len,
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size_t tag_len, enum evp_aead_direction_t dir);
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void (*cleanup)(EVP_AEAD_CTX *);
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int (*seal)(const EVP_AEAD_CTX *ctx, uint8_t *out, size_t *out_len,
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size_t max_out_len, const uint8_t *nonce, size_t nonce_len,
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const uint8_t *in, size_t in_len, const uint8_t *ad,
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size_t ad_len);
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int (*open)(const EVP_AEAD_CTX *ctx, uint8_t *out, size_t *out_len,
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size_t max_out_len, const uint8_t *nonce, size_t nonce_len,
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const uint8_t *in, size_t in_len, const uint8_t *ad,
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size_t ad_len);
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int (*get_rc4_state)(const EVP_AEAD_CTX *ctx, const RC4_KEY **out_key);
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};
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/* EVP_tls_cbc_get_padding determines the padding from the decrypted, TLS, CBC
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* record in |in|. This decrypted record should not include any "decrypted"
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* explicit IV. It sets |*out_len| to the length with the padding removed or
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* |in_len| if invalid.
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*
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* block_size: the block size of the cipher used to encrypt the record.
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* returns:
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* 0: (in non-constant time) if the record is publicly invalid.
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* 1: if the padding was valid
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* -1: otherwise. */
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int EVP_tls_cbc_remove_padding(unsigned *out_len,
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const uint8_t *in, unsigned in_len,
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unsigned block_size, unsigned mac_size);
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/* EVP_tls_cbc_copy_mac copies |md_size| bytes from the end of the first
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* |in_len| bytes of |in| to |out| in constant time (independent of the concrete
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* value of |in_len|, which may vary within a 256-byte window). |in| must point
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* to a buffer of |orig_len| bytes.
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*
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* On entry:
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* orig_len >= in_len >= md_size
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* md_size <= EVP_MAX_MD_SIZE */
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void EVP_tls_cbc_copy_mac(uint8_t *out, unsigned md_size,
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const uint8_t *in, unsigned in_len,
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unsigned orig_len);
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/* EVP_tls_cbc_record_digest_supported returns 1 iff |md| is a hash function
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* which EVP_tls_cbc_digest_record supports. */
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int EVP_tls_cbc_record_digest_supported(const EVP_MD *md);
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/* EVP_tls_cbc_digest_record computes the MAC of a decrypted, padded TLS
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* record.
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*
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* md: the hash function used in the HMAC.
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* EVP_tls_cbc_record_digest_supported must return true for this hash.
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* md_out: the digest output. At most EVP_MAX_MD_SIZE bytes will be written.
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* md_out_size: the number of output bytes is written here.
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* header: the 13-byte, TLS record header.
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* data: the record data itself
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* data_plus_mac_size: the secret, reported length of the data and MAC
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* once the padding has been removed.
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* data_plus_mac_plus_padding_size: the public length of the whole
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* record, including padding.
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*
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* On entry: by virtue of having been through one of the remove_padding
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* functions, above, we know that data_plus_mac_size is large enough to contain
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* a padding byte and MAC. (If the padding was invalid, it might contain the
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* padding too. ) */
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int EVP_tls_cbc_digest_record(const EVP_MD *md, uint8_t *md_out,
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size_t *md_out_size, const uint8_t header[13],
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const uint8_t *data, size_t data_plus_mac_size,
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size_t data_plus_mac_plus_padding_size,
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const uint8_t *mac_secret,
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unsigned mac_secret_length);
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#endif /* OPENSSL_HEADER_CIPHER_INTERNAL_H */
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