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Diffstat (limited to 'src/crypto/cipher/internal.h')
| -rw-r--r-- | src/crypto/cipher/internal.h | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/crypto/cipher/internal.h b/src/crypto/cipher/internal.h new file mode 100644 index 0000000..2b8fb05 --- /dev/null +++ b/src/crypto/cipher/internal.h @@ -0,0 +1,193 @@ +/* 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_INTERNAL_H +#define OPENSSL_HEADER_CIPHER_INTERNAL_H + +#include <openssl/base.h> + +#include <openssl/asn1t.h> + +#if defined(__cplusplus) +extern "C" { +#endif + + +struct evp_cipher_st { + /* type contains a NID identifing the cipher. (For example, NID_rc4.) */ + int nid; + + /* block_size contains the block size, in bytes, of the cipher, or 1 for a + * stream cipher. */ + unsigned block_size; + + /* key_len contains the key size, in bytes, for the cipher. If the cipher + * takes a variable key size then this contains the default size. */ + unsigned key_len; + + /* iv_len contains the IV size, in bytes, or zero if inapplicable. */ + unsigned iv_len; + + /* ctx_size contains the size, in bytes, of the per-key context for this + * cipher. */ + unsigned ctx_size; + + /* flags contains the OR of a number of flags. See |EVP_CIPH_*|. */ + uint32_t flags; + + /* app_data is a pointer to opaque, user data. */ + void *app_data; + + int (*init)(EVP_CIPHER_CTX *ctx, const uint8_t *key, const uint8_t *iv, + int enc); + + int (*cipher)(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, + size_t inl); + + int (*cleanup)(EVP_CIPHER_CTX *); + + int (*ctrl)(EVP_CIPHER_CTX *, int type, int arg, void *ptr); +}; + +/* EVP_CIPH_MODE_MASK contains the bits of |flags| that represent the mode. */ +#define EVP_CIPH_MODE_MASK 0x3f + + +struct evp_aead_ctx_st; + +/* EVP_AEAD represents a specific AEAD algorithm. */ +struct evp_aead_st { + uint8_t key_len; + uint8_t nonce_len; + uint8_t overhead; + uint8_t max_tag_len; + + int (*init)(struct evp_aead_ctx_st *, const uint8_t *key, + size_t key_len, size_t tag_len); + void (*cleanup)(struct evp_aead_ctx_st *); + + int (*seal)(const struct evp_aead_ctx_st *ctx, uint8_t *out, + size_t *out_len, size_t max_out_len, const uint8_t *nonce, + size_t nonce_len, const uint8_t *in, size_t in_len, + const uint8_t *ad, size_t ad_len); + + int (*open)(const struct evp_aead_ctx_st *ctx, uint8_t *out, + size_t *out_len, size_t max_out_len, const uint8_t *nonce, + size_t nonce_len, const uint8_t *in, size_t in_len, + const uint8_t *ad, size_t ad_len); +}; + + +/* 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. It sets |*out_len| to the length with the padding removed or + * |in_len| if invalid. + * + * block_size: the block size of the cipher used to encrypt the record. + * returns: + * 0: (in non-constant time) if the record is publicly invalid. + * 1: if the padding was valid + * -1: otherwise. */ +int EVP_tls_cbc_remove_padding(unsigned *out_len, + const uint8_t *in, unsigned in_len, + unsigned block_size, unsigned 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, unsigned md_size, + const uint8_t *in, unsigned in_len, + unsigned 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_INTERNAL_H */ |