- /* 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_H
- #define OPENSSL_HEADER_CIPHER_H
-
- #include <openssl/base.h>
-
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
-
- /* Ciphers. */
-
-
- /* Cipher primitives.
- *
- * The following functions return |EVP_CIPHER| objects that implement the named
- * cipher algorithm. */
-
- OPENSSL_EXPORT const EVP_CIPHER *EVP_rc4(void);
-
- OPENSSL_EXPORT const EVP_CIPHER *EVP_des_cbc(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_des_ede3_cbc(void);
-
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_ecb(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_cbc(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_ctr(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_ofb(void);
-
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_ecb(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_cbc(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_ctr(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_ofb(void);
-
- /* Deprecated AES-GCM implementations that set |EVP_CIPH_FLAG_CUSTOM_CIPHER|.
- * Use |EVP_aead_aes_128_gcm| and |EVP_aead_aes_256_gcm| instead. */
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_gcm(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_gcm(void);
-
- /* Deprecated 192-bit version of AES. */
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_ecb(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_cbc(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_ctr(void);
- OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_gcm(void);
-
- /* EVP_enc_null returns a 'cipher' that passes plaintext through as
- * ciphertext. */
- OPENSSL_EXPORT const EVP_CIPHER *EVP_enc_null(void);
-
- /* EVP_rc2_40_cbc returns a cipher that implements 40-bit RC2 in CBC mode. This
- * is obviously very, very weak and is included only in order to read PKCS#12
- * files, which often encrypt the certificate chain using this cipher. It is
- * deliberately not exported. */
- const EVP_CIPHER *EVP_rc2_40_cbc(void);
-
- /* EVP_get_cipherbynid returns the cipher corresponding to the given NID, or
- * NULL if no such cipher is known. */
- OPENSSL_EXPORT const EVP_CIPHER *EVP_get_cipherbynid(int nid);
-
-
- /* Cipher context allocation.
- *
- * An |EVP_CIPHER_CTX| represents the state of an encryption or decryption in
- * progress. */
-
- /* EVP_CIPHER_CTX_init initialises an, already allocated, |EVP_CIPHER_CTX|. */
- OPENSSL_EXPORT void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_new allocates a fresh |EVP_CIPHER_CTX|, calls
- * |EVP_CIPHER_CTX_init| and returns it, or NULL on allocation failure. */
- OPENSSL_EXPORT EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void);
-
- /* EVP_CIPHER_CTX_cleanup frees any memory referenced by |ctx|. It returns
- * one. */
- OPENSSL_EXPORT int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_free calls |EVP_CIPHER_CTX_cleanup| on |ctx| and then frees
- * |ctx| itself. */
- OPENSSL_EXPORT void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_copy sets |out| to be a duplicate of the current state of
- * |in|. The |out| argument must have been previously initialised. */
- OPENSSL_EXPORT int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out,
- const EVP_CIPHER_CTX *in);
-
-
- /* Cipher context configuration. */
-
- /* EVP_CipherInit_ex configures |ctx| for a fresh encryption (or decryption, if
- * |enc| is zero) operation using |cipher|. If |ctx| has been previously
- * configured with a cipher then |cipher|, |key| and |iv| may be |NULL| and
- * |enc| may be -1 to reuse the previous values. The operation will use |key|
- * as the key and |iv| as the IV (if any). These should have the correct
- * lengths given by |EVP_CIPHER_key_length| and |EVP_CIPHER_iv_length|. It
- * returns one on success and zero on error. */
- OPENSSL_EXPORT int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx,
- const EVP_CIPHER *cipher, ENGINE *engine,
- const uint8_t *key, const uint8_t *iv,
- int enc);
-
- /* EVP_EncryptInit_ex calls |EVP_CipherInit_ex| with |enc| equal to one. */
- OPENSSL_EXPORT int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,
- const EVP_CIPHER *cipher, ENGINE *impl,
- const uint8_t *key, const uint8_t *iv);
-
- /* EVP_DecryptInit_ex calls |EVP_CipherInit_ex| with |enc| equal to zero. */
- OPENSSL_EXPORT int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx,
- const EVP_CIPHER *cipher, ENGINE *impl,
- const uint8_t *key, const uint8_t *iv);
-
-
- /* Cipher operations. */
-
- /* EVP_EncryptUpdate encrypts |in_len| bytes from |in| to |out|. The number
- * of output bytes may be up to |in_len| plus the block length minus one and
- * |out| must have sufficient space. The number of bytes actually output is
- * written to |*out_len|. It returns one on success and zero otherwise. */
- OPENSSL_EXPORT int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out,
- int *out_len, const uint8_t *in,
- int in_len);
-
- /* EVP_EncryptFinal_ex writes at most a block of ciphertext to |out| and sets
- * |*out_len| to the number of bytes written. If padding is enabled (the
- * default) then standard padding is applied to create the final block. If
- * padding is disabled (with |EVP_CIPHER_CTX_set_padding|) then any partial
- * block remaining will cause an error. The function returns one on success and
- * zero otherwise. */
- OPENSSL_EXPORT int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out,
- int *out_len);
-
- /* EVP_DecryptUpdate decrypts |in_len| bytes from |in| to |out|. The number of
- * output bytes may be up to |in_len| plus the block length minus one and |out|
- * must have sufficient space. The number of bytes actually output is written
- * to |*out_len|. It returns one on success and zero otherwise. */
- OPENSSL_EXPORT int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out,
- int *out_len, const uint8_t *in,
- int in_len);
-
- /* EVP_DecryptFinal_ex writes at most a block of ciphertext to |out| and sets
- * |*out_len| to the number of bytes written. If padding is enabled (the
- * default) then padding is removed from the final block.
- *
- * WARNING: it is unsafe to call this function with unauthenticted
- * ciphertext if padding is enabled. */
- OPENSSL_EXPORT int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out,
- int *out_len);
-
- /* EVP_Cipher performs a one-shot encryption/decryption operation. No partial
- * blocks are maintained between calls. However, any internal cipher state is
- * still updated. For CBC-mode ciphers, the IV is updated to the final
- * ciphertext block. For stream ciphers, the stream is advanced past the bytes
- * used. It returns one on success and zero otherwise, unless |EVP_CIPHER_flags|
- * has |EVP_CIPH_FLAG_CUSTOM_CIPHER| set. Then it returns the number of bytes
- * written or -1 on error.
- *
- * WARNING: this differs from the usual return value convention when using
- * |EVP_CIPH_FLAG_CUSTOM_CIPHER|.
- *
- * TODO(davidben): The normal ciphers currently never fail, even if, e.g.,
- * |in_len| is not a multiple of the block size for CBC-mode decryption. The
- * input just gets rounded up while the output gets truncated. This should
- * either be officially documented or fail. */
- OPENSSL_EXPORT int EVP_Cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
- const uint8_t *in, size_t in_len);
-
- /* EVP_CipherUpdate calls either |EVP_EncryptUpdate| or |EVP_DecryptUpdate|
- * depending on how |ctx| has been setup. */
- OPENSSL_EXPORT int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out,
- int *out_len, const uint8_t *in,
- int in_len);
-
- /* EVP_CipherFinal_ex calls either |EVP_EncryptFinal_ex| or
- * |EVP_DecryptFinal_ex| depending on how |ctx| has been setup. */
- OPENSSL_EXPORT int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out,
- int *out_len);
-
-
- /* Cipher context accessors. */
-
- /* EVP_CIPHER_CTX_cipher returns the |EVP_CIPHER| underlying |ctx|, or NULL if
- * none has been set. */
- OPENSSL_EXPORT const EVP_CIPHER *EVP_CIPHER_CTX_cipher(
- const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_nid returns a NID identifying the |EVP_CIPHER| underlying
- * |ctx| (e.g. |NID_aes_128_gcm|). It will crash if no cipher has been
- * configured. */
- OPENSSL_EXPORT int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_block_size returns the block size, in bytes, of the cipher
- * underlying |ctx|, or one if the cipher is a stream cipher. It will crash if
- * no cipher has been configured. */
- OPENSSL_EXPORT unsigned EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_key_length returns the key size, in bytes, of the cipher
- * underlying |ctx| or zero if no cipher has been configured. */
- OPENSSL_EXPORT unsigned EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_iv_length returns the IV size, in bytes, of the cipher
- * underlying |ctx|. It will crash if no cipher has been configured. */
- OPENSSL_EXPORT unsigned EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_get_app_data returns the opaque, application data pointer for
- * |ctx|, or NULL if none has been set. */
- OPENSSL_EXPORT void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_set_app_data sets the opaque, application data pointer for
- * |ctx| to |data|. */
- OPENSSL_EXPORT void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx,
- void *data);
-
- /* EVP_CIPHER_CTX_flags returns a value which is the OR of zero or more
- * |EVP_CIPH_*| flags. It will crash if no cipher has been configured. */
- OPENSSL_EXPORT uint32_t EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_mode returns one of the |EVP_CIPH_*| cipher mode values
- * enumerated below. It will crash if no cipher has been configured. */
- OPENSSL_EXPORT uint32_t EVP_CIPHER_CTX_mode(const EVP_CIPHER_CTX *ctx);
-
- /* EVP_CIPHER_CTX_ctrl is an |ioctl| like function. The |command| argument
- * should be one of the |EVP_CTRL_*| values. The |arg| and |ptr| arguments are
- * specific to the command in question. */
- OPENSSL_EXPORT int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int command,
- int arg, void *ptr);
-
- /* EVP_CIPHER_CTX_set_padding sets whether padding is enabled for |ctx| and
- * returns one. Pass a non-zero |pad| to enable padding (the default) or zero
- * to disable. */
- OPENSSL_EXPORT int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad);
-
- /* EVP_CIPHER_CTX_set_key_length sets the key length for |ctx|. This is only
- * valid for ciphers that can take a variable length key. It returns one on
- * success and zero on error. */
- OPENSSL_EXPORT int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *ctx, unsigned key_len);
-
-
- /* Cipher accessors. */
-
- /* EVP_CIPHER_nid returns a NID identifing |cipher|. (For example,
- * |NID_aes_128_gcm|.) */
- OPENSSL_EXPORT int EVP_CIPHER_nid(const EVP_CIPHER *cipher);
-
- /* EVP_CIPHER_block_size returns the block size, in bytes, for |cipher|, or one
- * if |cipher| is a stream cipher. */
- OPENSSL_EXPORT unsigned EVP_CIPHER_block_size(const EVP_CIPHER *cipher);
-
- /* EVP_CIPHER_key_length returns the key size, in bytes, for |cipher|. If
- * |cipher| can take a variable key length then this function returns the
- * default key length and |EVP_CIPHER_flags| will return a value with
- * |EVP_CIPH_VARIABLE_LENGTH| set. */
- OPENSSL_EXPORT unsigned EVP_CIPHER_key_length(const EVP_CIPHER *cipher);
-
- /* EVP_CIPHER_iv_length returns the IV size, in bytes, of |cipher|, or zero if
- * |cipher| doesn't take an IV. */
- OPENSSL_EXPORT unsigned EVP_CIPHER_iv_length(const EVP_CIPHER *cipher);
-
- /* EVP_CIPHER_flags returns a value which is the OR of zero or more
- * |EVP_CIPH_*| flags. */
- OPENSSL_EXPORT uint32_t EVP_CIPHER_flags(const EVP_CIPHER *cipher);
-
- /* EVP_CIPHER_mode returns one of the cipher mode values enumerated below. */
- OPENSSL_EXPORT uint32_t EVP_CIPHER_mode(const EVP_CIPHER *cipher);
-
-
- /* Key derivation. */
-
- /* EVP_BytesToKey generates a key and IV for the cipher |type| by iterating
- * |md| |count| times using |data| and |salt|. On entry, the |key| and |iv|
- * buffers must have enough space to hold a key and IV for |type|. It returns
- * the length of the key on success or zero on error. */
- OPENSSL_EXPORT int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
- const uint8_t *salt, const uint8_t *data,
- size_t data_len, unsigned count, uint8_t *key,
- uint8_t *iv);
-
-
- /* Cipher modes (for |EVP_CIPHER_mode|). */
-
- #define EVP_CIPH_STREAM_CIPHER 0x0
- #define EVP_CIPH_ECB_MODE 0x1
- #define EVP_CIPH_CBC_MODE 0x2
- #define EVP_CIPH_CFB_MODE 0x3
- #define EVP_CIPH_OFB_MODE 0x4
- #define EVP_CIPH_CTR_MODE 0x5
- #define EVP_CIPH_GCM_MODE 0x6
-
-
- /* Cipher flags (for |EVP_CIPHER_flags|). */
-
- /* EVP_CIPH_VARIABLE_LENGTH indicates that the cipher takes a variable length
- * key. */
- #define EVP_CIPH_VARIABLE_LENGTH 0x40
-
- /* EVP_CIPH_ALWAYS_CALL_INIT indicates that the |init| function for the cipher
- * should always be called when initialising a new operation, even if the key
- * is NULL to indicate that the same key is being used. */
- #define EVP_CIPH_ALWAYS_CALL_INIT 0x80
-
- /* EVP_CIPH_CUSTOM_IV indicates that the cipher manages the IV itself rather
- * than keeping it in the |iv| member of |EVP_CIPHER_CTX|. */
- #define EVP_CIPH_CUSTOM_IV 0x100
-
- /* EVP_CIPH_CTRL_INIT indicates that EVP_CTRL_INIT should be used when
- * initialising an |EVP_CIPHER_CTX|. */
- #define EVP_CIPH_CTRL_INIT 0x200
-
- /* EVP_CIPH_FLAG_CUSTOM_CIPHER indicates that the cipher manages blocking
- * itself. This causes EVP_(En|De)crypt_ex to be simple wrapper functions. */
- #define EVP_CIPH_FLAG_CUSTOM_CIPHER 0x400
-
- /* EVP_CIPH_FLAG_AEAD_CIPHER specifies that the cipher is an AEAD. This is an
- * older version of the proper AEAD interface. See aead.h for the current
- * one. */
- #define EVP_CIPH_FLAG_AEAD_CIPHER 0x800
-
- /* EVP_CIPH_CUSTOM_COPY indicates that the |ctrl| callback should be called
- * with |EVP_CTRL_COPY| at the end of normal |EVP_CIPHER_CTX_copy|
- * processing. */
- #define EVP_CIPH_CUSTOM_COPY 0x1000
-
-
- /* Deprecated functions */
-
- /* EVP_CipherInit acts like EVP_CipherInit_ex except that |EVP_CIPHER_CTX_init|
- * is called on |cipher| first, if |cipher| is not NULL. */
- OPENSSL_EXPORT int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- const uint8_t *key, const uint8_t *iv,
- int enc);
-
- /* EVP_EncryptInit calls |EVP_CipherInit| with |enc| equal to one. */
- OPENSSL_EXPORT int EVP_EncryptInit(EVP_CIPHER_CTX *ctx,
- const EVP_CIPHER *cipher, const uint8_t *key,
- const uint8_t *iv);
-
- /* EVP_DecryptInit calls |EVP_CipherInit| with |enc| equal to zero. */
- OPENSSL_EXPORT int EVP_DecryptInit(EVP_CIPHER_CTX *ctx,
- const EVP_CIPHER *cipher, const uint8_t *key,
- const uint8_t *iv);
-
- /* EVP_add_cipher_alias does nothing and returns one. */
- OPENSSL_EXPORT int EVP_add_cipher_alias(const char *a, const char *b);
-
- /* EVP_get_cipherbyname returns an |EVP_CIPHER| given a human readable name in
- * |name|, or NULL if the name is unknown. */
- OPENSSL_EXPORT const EVP_CIPHER *EVP_get_cipherbyname(const char *name);
-
-
- /* Private functions. */
-
- /* EVP_CIPH_NO_PADDING disables padding in block ciphers. */
- #define EVP_CIPH_NO_PADDING 0x800
-
- /* EVP_CIPHER_CTX_ctrl commands. */
- #define EVP_CTRL_INIT 0x0
- #define EVP_CTRL_SET_KEY_LENGTH 0x1
- #define EVP_CTRL_GET_RC2_KEY_BITS 0x2
- #define EVP_CTRL_SET_RC2_KEY_BITS 0x3
- #define EVP_CTRL_GET_RC5_ROUNDS 0x4
- #define EVP_CTRL_SET_RC5_ROUNDS 0x5
- #define EVP_CTRL_RAND_KEY 0x6
- #define EVP_CTRL_PBE_PRF_NID 0x7
- #define EVP_CTRL_COPY 0x8
- #define EVP_CTRL_GCM_SET_IVLEN 0x9
- #define EVP_CTRL_GCM_GET_TAG 0x10
- #define EVP_CTRL_GCM_SET_TAG 0x11
- #define EVP_CTRL_GCM_SET_IV_FIXED 0x12
- #define EVP_CTRL_GCM_IV_GEN 0x13
- #define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
- /* Set the GCM invocation field, decrypt only */
- #define EVP_CTRL_GCM_SET_IV_INV 0x18
-
- /* GCM TLS constants */
- /* Length of fixed part of IV derived from PRF */
- #define EVP_GCM_TLS_FIXED_IV_LEN 4
- /* Length of explicit part of IV part of TLS records */
- #define EVP_GCM_TLS_EXPLICIT_IV_LEN 8
- /* Length of tag for TLS */
- #define EVP_GCM_TLS_TAG_LEN 16
-
- #define EVP_MAX_KEY_LENGTH 64
- #define EVP_MAX_IV_LENGTH 16
- #define EVP_MAX_BLOCK_LENGTH 32
-
- struct evp_cipher_ctx_st {
- /* cipher contains the underlying cipher for this context. */
- const EVP_CIPHER *cipher;
-
- /* app_data is a pointer to opaque, user data. */
- void *app_data; /* application stuff */
-
- /* cipher_data points to the |cipher| specific state. */
- void *cipher_data;
-
- /* key_len contains the length of the key, which may differ from
- * |cipher->key_len| if the cipher can take a variable key length. */
- unsigned key_len;
-
- /* encrypt is one if encrypting and zero if decrypting. */
- int encrypt;
-
- /* flags contains the OR of zero or more |EVP_CIPH_*| flags, above. */
- uint32_t flags;
-
- /* oiv contains the original IV value. */
- uint8_t oiv[EVP_MAX_IV_LENGTH];
-
- /* iv contains the current IV value, which may have been updated. */
- uint8_t iv[EVP_MAX_IV_LENGTH];
-
- /* buf contains a partial block which is used by, for example, CTR mode to
- * store unused keystream bytes. */
- uint8_t buf[EVP_MAX_BLOCK_LENGTH];
-
- /* buf_len contains the number of bytes of a partial block contained in
- * |buf|. */
- int buf_len;
-
- /* num contains the number of bytes of |iv| which are valid for modes that
- * manage partial blocks themselves. */
- int num;
-
- /* final_used is non-zero if the |final| buffer contains plaintext. */
- int final_used;
-
- /* block_mask contains |cipher->block_size| minus one. (The block size
- * assumed to be a power of two.) */
- int block_mask;
-
- uint8_t final[EVP_MAX_BLOCK_LENGTH]; /* possible final block */
- } /* EVP_CIPHER_CTX */;
-
- typedef struct evp_cipher_info_st {
- const EVP_CIPHER *cipher;
- unsigned char iv[EVP_MAX_IV_LENGTH];
- } EVP_CIPHER_INFO;
-
- struct evp_cipher_st {
- /* type contains a NID identifing the cipher. (e.g. NID_aes_128_gcm.) */
- 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);
-
- /* cleanup, if non-NULL, releases memory associated with the context. It is
- * called if |EVP_CTRL_INIT| succeeds. Note that |init| may not have been
- * called at this point. */
- void (*cleanup)(EVP_CIPHER_CTX *);
-
- int (*ctrl)(EVP_CIPHER_CTX *, int type, int arg, void *ptr);
- };
-
-
- #if defined(__cplusplus)
- } /* extern C */
- #endif
-
- #define CIPHER_R_AES_KEY_SETUP_FAILED 100
- #define CIPHER_R_BAD_DECRYPT 101
- #define CIPHER_R_BAD_KEY_LENGTH 102
- #define CIPHER_R_BUFFER_TOO_SMALL 103
- #define CIPHER_R_CTRL_NOT_IMPLEMENTED 104
- #define CIPHER_R_CTRL_OPERATION_NOT_IMPLEMENTED 105
- #define CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH 106
- #define CIPHER_R_INITIALIZATION_ERROR 107
- #define CIPHER_R_INPUT_NOT_INITIALIZED 108
- #define CIPHER_R_INVALID_AD_SIZE 109
- #define CIPHER_R_INVALID_KEY_LENGTH 110
- #define CIPHER_R_INVALID_NONCE_SIZE 111
- #define CIPHER_R_INVALID_OPERATION 112
- #define CIPHER_R_IV_TOO_LARGE 113
- #define CIPHER_R_NO_CIPHER_SET 114
- #define CIPHER_R_OUTPUT_ALIASES_INPUT 115
- #define CIPHER_R_TAG_TOO_LARGE 116
- #define CIPHER_R_TOO_LARGE 117
- #define CIPHER_R_UNSUPPORTED_AD_SIZE 118
- #define CIPHER_R_UNSUPPORTED_INPUT_SIZE 119
- #define CIPHER_R_UNSUPPORTED_KEY_SIZE 120
- #define CIPHER_R_UNSUPPORTED_NONCE_SIZE 121
- #define CIPHER_R_UNSUPPORTED_TAG_SIZE 122
- #define CIPHER_R_WRONG_FINAL_BLOCK_LENGTH 123
- #define CIPHER_R_NO_DIRECTION_SET 124
-
- #endif /* OPENSSL_HEADER_CIPHER_H */
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