c2d3280f0f
This function allows one to extract the current IVs from an SSL connection. This is needed for the CBC cipher suites with implicit IVs because, for those, the IV can't be extracted from the handshake key material. Change-Id: I247a1d0813b7a434b3cfc88db86d2fe8754344b6 Reviewed-on: https://boringssl-review.googlesource.com/6433 Reviewed-by: Adam Langley <agl@google.com>
165 lines
7.3 KiB
C
165 lines
7.3 KiB
C
/* 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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int (*get_iv)(const EVP_AEAD_CTX *ctx, const uint8_t **out_iv,
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size_t *out_len);
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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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