BoringSSL as optional cryptobackend for ngtcp2

PR добавляет возможность использовать BoringSSL в ngtcp2 в качестве криптобиблиотеки. Для проектов в Аркадии, уже зависящих от ngtcp2, добавлена явная зависимость от слоя абстракции quictls (сейчас в транке ngtcp2 собирается с quictls).
commit_hash:3d6607abecfcff2157859acbdd18f9d0345ac485

1 files changed, 663 insertions, 0 deletions

diff --git a/contrib/restricted/google/boringssl/include/openssl/cipher.h b/contrib/restricted/google/boringssl/include/openssl/cipher.h
new file mode 100644
index 00000000000..6e5d030648e
--- /dev/null
+++ b/contrib/restricted/google/boringssl/include/openssl/cipher.h
@@ -0,0 +1,663 @@
+/* Copyright (C) 1995-1998 Eric Young ([email protected])
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young ([email protected]).
+ * 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 ([email protected]).
+ *
+ * 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 ([email protected])"
+ *    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 ([email protected])"
+ *
+ * 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 <contrib/restricted/google/boringssl/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_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 |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
+#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