gnunet-android

cipher.h (26700B)

---

 // Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef OPENSSL_HEADER_CIPHER_H
 #define OPENSSL_HEADER_CIPHER_H
 
 #include <openssl/base.h>   // IWYU pragma: export
 
 #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_ecb(void);
 OPENSSL_EXPORT const EVP_CIPHER *EVP_des_ede(void);
 OPENSSL_EXPORT const EVP_CIPHER *EVP_des_ede3(void);
 OPENSSL_EXPORT const EVP_CIPHER *EVP_des_ede_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);
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_xts(void);
 
 // EVP_enc_null returns a 'cipher' that passes plaintext through as
 // ciphertext.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_enc_null(void);
 
 // EVP_rc2_cbc returns a cipher that implements 128-bit RC2 in CBC mode.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_rc2_cbc(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. Note using this function links almost every
 // cipher implemented by BoringSSL into the binary, whether the caller uses them
 // or not. Size-conscious callers, such as client software, should not use this
 // function.
 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);
 
 // EVP_CIPHER_CTX_reset calls |EVP_CIPHER_CTX_cleanup| followed by
 // |EVP_CIPHER_CTX_init| and returns one.
 OPENSSL_EXPORT int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx);
 
 
 // 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.
 //
 // If |ctx| is an AEAD cipher, e.g. |EVP_aes_128_gcm|, and |out| is NULL, this
 // function instead adds |in_len| bytes from |in| to the AAD and sets |*out_len|
 // to |in_len|. The AAD must be fully specified in this way before this function
 // is used to encrypt plaintext.
 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.
 //
 // If |ctx| is an AEAD cipher, e.g. |EVP_aes_128_gcm|, and |out| is NULL, this
 // function instead adds |in_len| bytes from |in| to the AAD and sets |*out_len|
 // to |in_len|. The AAD must be fully specified in this way before this function
 // is used to decrypt ciphertext.
 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 unauthenticated
 // ciphertext if padding is enabled.
 OPENSSL_EXPORT int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out,
                                        int *out_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_encrypting returns one if |ctx| is configured for encryption
 // and zero otherwise.
 OPENSSL_EXPORT int EVP_CIPHER_CTX_encrypting(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 identifying |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 an optional |salt|, writing the result to
 // |key| and |iv|. If not NULL, the |key| and |iv| buffers must have enough
 // space to hold a key and IV for |type|, as returned by |EVP_CIPHER_key_length|
 // and |EVP_CIPHER_iv_length|. This function returns the length of the key
 // (without the IV) on success or zero on error.
 //
 // If |salt| is NULL, the empty string is used as the salt. Salt lengths other
 // than 0 and 8 are not supported by this function. Either of |key| or |iv| may
 // be NULL to skip that output.
 //
 // When the total data derived is less than the size of |md|, this function
 // implements PBKDF1 from RFC 8018. Otherwise, it generalizes PBKDF1 by
 // computing prepending the previous output to |data| and re-running PBKDF1 for
 // further output.
 //
 // This function is provided for compatibility with legacy uses of PBKDF1. New
 // applications should use a more modern algorithm, such as |EVP_PBE_scrypt|.
 OPENSSL_EXPORT int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
                                   const uint8_t salt[8], 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
 #define EVP_CIPH_XTS_MODE 0x7
 
 // The following values are never returned from |EVP_CIPHER_mode| and are
 // included only to make it easier to compile code with BoringSSL.
 #define EVP_CIPH_CCM_MODE 0x8
 #define EVP_CIPH_OCB_MODE 0x9
 #define EVP_CIPH_WRAP_MODE 0xa
 
 
 // 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
 
 // EVP_CIPH_FLAG_NON_FIPS_ALLOW is meaningless. In OpenSSL it permits non-FIPS
 // algorithms in FIPS mode. But BoringSSL FIPS mode doesn't prohibit algorithms
 // (it's up the the caller to use the FIPS module in a fashion compliant with
 // their needs). Thus this exists only to allow code to compile.
 #define EVP_CIPH_FLAG_NON_FIPS_ALLOW 0
 
 
 // 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_CipherFinal calls |EVP_CipherFinal_ex|.
 OPENSSL_EXPORT int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, uint8_t *out,
                                    int *out_len);
 
 // EVP_EncryptFinal calls |EVP_EncryptFinal_ex|.
 OPENSSL_EXPORT int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, uint8_t *out,
                                     int *out_len);
 
 // EVP_DecryptFinal calls |EVP_DecryptFinal_ex|.
 OPENSSL_EXPORT int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, uint8_t *out,
                                     int *out_len);
 
 // EVP_Cipher historically exposed an internal implementation detail of |ctx|
 // and should not be used. Use |EVP_CipherUpdate| and |EVP_CipherFinal_ex|
 // instead.
 //
 // If |ctx|'s cipher does not have the |EVP_CIPH_FLAG_CUSTOM_CIPHER| flag, it
 // encrypts or decrypts |in_len| bytes from |in| and writes the resulting
 // |in_len| bytes to |out|. It returns one on success and zero on error.
 // |in_len| must be a multiple of the cipher's block size, or the behavior is
 // undefined.
 //
 // TODO(davidben): Rather than being undefined (it'll often round the length up
 // and likely read past the buffer), just fail the operation.
 //
 // If |ctx|'s cipher has the |EVP_CIPH_FLAG_CUSTOM_CIPHER| flag, it runs in one
 // of two modes: If |in| is non-NULL, it behaves like |EVP_CipherUpdate|. If
 // |in| is NULL, it behaves like |EVP_CipherFinal_ex|. In both cases, it returns
 // |*out_len| on success and -1 on error.
 //
 // WARNING: The two possible calling conventions of this function signal errors
 // incompatibly. In the first, zero indicates an error. In the second, zero
 // indicates success with zero bytes of output.
 OPENSSL_EXPORT int EVP_Cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
                               const uint8_t *in, size_t in_len);
 
 // 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. Note using this function links almost
 // every cipher implemented by BoringSSL into the binary, not just the ones the
 // caller requests. Size-conscious callers, such as client software, should not
 // use this function.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_get_cipherbyname(const char *name);
 
 // These AEADs are deprecated AES-GCM implementations that set
 // |EVP_CIPH_FLAG_CUSTOM_CIPHER|. Use |EVP_aead_aes_128_gcm| and
 // |EVP_aead_aes_256_gcm| instead.
 //
 // WARNING: Although these APIs allow streaming an individual AES-GCM operation,
 // this is not secure. Until calling |EVP_DecryptFinal_ex|, the tag has not yet
 // been checked and output released by |EVP_DecryptUpdate| is unauthenticated
 // and easily manipulated by attackers. Callers must buffer the output and may
 // not act on it until the entire operation is complete.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_gcm(void);
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_gcm(void);
 
 // These are 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);
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_ofb(void);
 
 // EVP_des_ede3_ecb is an alias for |EVP_des_ede3|. Use the former instead.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_des_ede3_ecb(void);
 
 // EVP_aes_128_cfb128 is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_cfb128(void);
 
 // EVP_aes_128_cfb is an alias for |EVP_aes_128_cfb128| and is only available in
 // decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_128_cfb(void);
 
 // EVP_aes_192_cfb128 is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_cfb128(void);
 
 // EVP_aes_192_cfb is an alias for |EVP_aes_192_cfb128| and is only available in
 // decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_192_cfb(void);
 
 // EVP_aes_256_cfb128 is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_cfb128(void);
 
 // EVP_aes_256_cfb is an alias for |EVP_aes_256_cfb128| and is only available in
 // decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_aes_256_cfb(void);
 
 // EVP_bf_ecb is Blowfish in ECB mode and is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_bf_ecb(void);
 
 // EVP_bf_cbc is Blowfish in CBC mode and is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_bf_cbc(void);
 
 // EVP_bf_cfb is Blowfish in 64-bit CFB mode and is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_bf_cfb(void);
 
 // EVP_cast5_ecb is CAST5 in ECB mode and is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_cast5_ecb(void);
 
 // EVP_cast5_cbc is CAST5 in CBC mode and is only available in decrepit.
 OPENSSL_EXPORT const EVP_CIPHER *EVP_cast5_cbc(void);
 
 // The following flags do nothing and are included only to make it easier to
 // compile code with BoringSSL.
 #define EVP_CIPHER_CTX_FLAG_WRAP_ALLOW 0
 
 // EVP_CIPHER_CTX_set_flags does nothing.
 OPENSSL_EXPORT void EVP_CIPHER_CTX_set_flags(const EVP_CIPHER_CTX *ctx,
                                              uint32_t flags);
 
 
 // Private functions.
 
 // EVP_CIPH_NO_PADDING disables padding in block ciphers.
 #define EVP_CIPH_NO_PADDING 0x800
 
 // The following are |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_AEAD_SET_IVLEN 0x9
 #define EVP_CTRL_AEAD_GET_TAG 0x10
 #define EVP_CTRL_AEAD_SET_TAG 0x11
 #define EVP_CTRL_AEAD_SET_IV_FIXED 0x12
 #define EVP_CTRL_GCM_IV_GEN 0x13
 #define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
 // EVP_CTRL_GCM_SET_IV_INV sets the GCM invocation field, decrypt only
 #define EVP_CTRL_GCM_SET_IV_INV 0x18
 #define EVP_CTRL_GET_IVLEN 0x19
 
 // The following constants are unused.
 #define EVP_GCM_TLS_FIXED_IV_LEN 4
 #define EVP_GCM_TLS_EXPLICIT_IV_LEN 8
 #define EVP_GCM_TLS_TAG_LEN 16
 
 // The following are legacy aliases for AEAD |EVP_CIPHER_CTX_ctrl| values.
 #define EVP_CTRL_GCM_SET_IVLEN EVP_CTRL_AEAD_SET_IVLEN
 #define EVP_CTRL_GCM_GET_TAG EVP_CTRL_AEAD_GET_TAG
 #define EVP_CTRL_GCM_SET_TAG EVP_CTRL_AEAD_SET_TAG
 #define EVP_CTRL_GCM_SET_IV_FIXED EVP_CTRL_AEAD_SET_IV_FIXED
 
 #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.
   unsigned num;
 
   // final_used is non-zero if the |final| buffer contains plaintext.
   int final_used;
 
   uint8_t final[EVP_MAX_BLOCK_LENGTH];  // possible final block
 
   // Has this structure been rendered unusable by a failure.
   int poisoned;
 } /* EVP_CIPHER_CTX */;
 
 typedef struct evp_cipher_info_st {
   const EVP_CIPHER *cipher;
   unsigned char iv[EVP_MAX_IV_LENGTH];
 } EVP_CIPHER_INFO;
 
 
 #if defined(__cplusplus)
 }  // extern C
 
 #if !defined(BORINGSSL_NO_CXX)
 extern "C++" {
 
 BSSL_NAMESPACE_BEGIN
 
 BORINGSSL_MAKE_DELETER(EVP_CIPHER_CTX, EVP_CIPHER_CTX_free)
 
 using ScopedEVP_CIPHER_CTX =
     internal::StackAllocated<EVP_CIPHER_CTX, int, EVP_CIPHER_CTX_init,
                              EVP_CIPHER_CTX_cleanup>;
 
 BSSL_NAMESPACE_END
 
 }  // extern C++
 #endif
 
 #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
 #define CIPHER_R_INVALID_NONCE 125
 
 #endif  // OPENSSL_HEADER_CIPHER_H