doc/man7/provider-cipher.pod - third_party/openssl - Git at Google

 =pod

 =head1 NAME

 provider-cipher - The cipher library E<lt>-E<gt> provider functions

 =head1 SYNOPSIS

 =for openssl multiple includes

  #include <openssl/core_dispatch.h>
  #include <openssl/core_names.h>

  /*
   * None of these are actual functions, but are displayed like this for
   * the function signatures for functions that are offered as function
   * pointers in OSSL_DISPATCH arrays.
   */

  /* Context management */
  void *OSSL_FUNC_cipher_newctx(void *provctx);
  void OSSL_FUNC_cipher_freectx(void *cctx);
  void *OSSL_FUNC_cipher_dupctx(void *cctx);

  /* Encryption/decryption */
  int OSSL_FUNC_cipher_encrypt_init(void *cctx, const unsigned char *key,
                                    size_t keylen, const unsigned char *iv,
                                    size_t ivlen, const OSSL_PARAM params[]);
  int OSSL_FUNC_cipher_decrypt_init(void *cctx, const unsigned char *key,
                                    size_t keylen, const unsigned char *iv,
                                    size_t ivlen, const OSSL_PARAM params[]);
  int OSSL_FUNC_cipher_update(void *cctx, unsigned char *out, size_t *outl,
                              size_t outsize, const unsigned char *in, size_t inl);
  int OSSL_FUNC_cipher_final(void *cctx, unsigned char *out, size_t *outl,
                             size_t outsize);
  int OSSL_FUNC_cipher_cipher(void *cctx, unsigned char *out, size_t *outl,
                              size_t outsize, const unsigned char *in, size_t inl);

  /* Cipher parameter descriptors */
  const OSSL_PARAM *OSSL_FUNC_cipher_gettable_params(void *provctx);

  /* Cipher operation parameter descriptors */
  const OSSL_PARAM *OSSL_FUNC_cipher_gettable_ctx_params(void *cctx,
                                                         void *provctx);
  const OSSL_PARAM *OSSL_FUNC_cipher_settable_ctx_params(void *cctx,
                                                         void *provctx);

  /* Cipher parameters */
  int OSSL_FUNC_cipher_get_params(OSSL_PARAM params[]);

  /* Cipher operation parameters */
  int OSSL_FUNC_cipher_get_ctx_params(void *cctx, OSSL_PARAM params[]);
  int OSSL_FUNC_cipher_set_ctx_params(void *cctx, const OSSL_PARAM params[]);

 =head1 DESCRIPTION

 This documentation is primarily aimed at provider authors. See L<provider(7)>
 for further information.

 The CIPHER operation enables providers to implement cipher algorithms and make
 them available to applications via the API functions L<EVP_EncryptInit_ex(3)>,
 L<EVP_EncryptUpdate(3)> and L<EVP_EncryptFinal(3)> (as well as the decrypt
 equivalents and other related functions).

 All "functions" mentioned here are passed as function pointers between
 F<libcrypto> and the provider in B<OSSL_DISPATCH> arrays via
 B<OSSL_ALGORITHM> arrays that are returned by the provider's
 provider_query_operation() function
 (see L<provider-base(7)/Provider Functions>).

 All these "functions" have a corresponding function type definition
 named B<OSSL_FUNC_{name}_fn>, and a helper function to retrieve the
 function pointer from an B<OSSL_DISPATCH> element named
 B<OSSL_FUNC_{name}>.
 For example, the "function" OSSL_FUNC_cipher_newctx() has these:

  typedef void *(OSSL_OSSL_FUNC_cipher_newctx_fn)(void *provctx);
  static ossl_inline OSSL_OSSL_FUNC_cipher_newctx_fn
      OSSL_FUNC_cipher_newctx(const OSSL_DISPATCH *opf);

 B<OSSL_DISPATCH> arrays are indexed by numbers that are provided as
 macros in L<openssl-core_dispatch.h(7)>, as follows:

  OSSL_FUNC_cipher_newctx               OSSL_FUNC_CIPHER_NEWCTX
  OSSL_FUNC_cipher_freectx              OSSL_FUNC_CIPHER_FREECTX
  OSSL_FUNC_cipher_dupctx               OSSL_FUNC_CIPHER_DUPCTX

  OSSL_FUNC_cipher_encrypt_init         OSSL_FUNC_CIPHER_ENCRYPT_INIT
  OSSL_FUNC_cipher_decrypt_init         OSSL_FUNC_CIPHER_DECRYPT_INIT
  OSSL_FUNC_cipher_update               OSSL_FUNC_CIPHER_UPDATE
  OSSL_FUNC_cipher_final                OSSL_FUNC_CIPHER_FINAL
  OSSL_FUNC_cipher_cipher               OSSL_FUNC_CIPHER_CIPHER

  OSSL_FUNC_cipher_get_params           OSSL_FUNC_CIPHER_GET_PARAMS
  OSSL_FUNC_cipher_get_ctx_params       OSSL_FUNC_CIPHER_GET_CTX_PARAMS
  OSSL_FUNC_cipher_set_ctx_params       OSSL_FUNC_CIPHER_SET_CTX_PARAMS

  OSSL_FUNC_cipher_gettable_params      OSSL_FUNC_CIPHER_GETTABLE_PARAMS
  OSSL_FUNC_cipher_gettable_ctx_params  OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS
  OSSL_FUNC_cipher_settable_ctx_params  OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS

 A cipher algorithm implementation may not implement all of these functions.
 In order to be a consistent set of functions there must at least be a complete
 set of "encrypt" functions, or a complete set of "decrypt" functions, or a
 single "cipher" function.
 In all cases both the OSSL_FUNC_cipher_newctx and OSSL_FUNC_cipher_freectx functions must be
 present.
 All other functions are optional.

 =head2 Context Management Functions

 OSSL_FUNC_cipher_newctx() should create and return a pointer to a provider side
 structure for holding context information during a cipher operation.
 A pointer to this context will be passed back in a number of the other cipher
 operation function calls.
 The parameter I<provctx> is the provider context generated during provider
 initialisation (see L<provider(7)>).

 OSSL_FUNC_cipher_freectx() is passed a pointer to the provider side cipher context in
 the I<cctx> parameter.
 This function should free any resources associated with that context.

 OSSL_FUNC_cipher_dupctx() should duplicate the provider side cipher context in the
 I<cctx> parameter and return the duplicate copy.

 =head2 Encryption/Decryption Functions

 OSSL_FUNC_cipher_encrypt_init() initialises a cipher operation for encryption given a
 newly created provider side cipher context in the I<cctx> parameter.
 The key to be used is given in I<key> which is I<keylen> bytes long.
 The IV to be used is given in I<iv> which is I<ivlen> bytes long.
 The I<params>, if not NULL, should be set on the context in a manner similar to
 using OSSL_FUNC_cipher_set_ctx_params().

 OSSL_FUNC_cipher_decrypt_init() is the same as OSSL_FUNC_cipher_encrypt_init() except that it
 initialises the context for a decryption operation.

 OSSL_FUNC_cipher_update() is called to supply data to be encrypted/decrypted as part of
 a previously initialised cipher operation.
 The I<cctx> parameter contains a pointer to a previously initialised provider
 side context.
 OSSL_FUNC_cipher_update() should encrypt/decrypt I<inl> bytes of data at the location
 pointed to by I<in>.
 The encrypted data should be stored in I<out> and the amount of data written to
 I<*outl> which should not exceed I<outsize> bytes.
 OSSL_FUNC_cipher_update() may be called multiple times for a single cipher operation.
 It is the responsibility of the cipher implementation to handle input lengths
 that are not multiples of the block length.
 In such cases a cipher implementation will typically cache partial blocks of
 input data until a complete block is obtained.
 I<out> may be the same location as I<in> but it should not partially overlap.
 The same expectations apply to I<outsize> as documented for
 L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)>.

 OSSL_FUNC_cipher_final() completes an encryption or decryption started through previous
 OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init(), and OSSL_FUNC_cipher_update()
 calls.
 The I<cctx> parameter contains a pointer to the provider side context.
 Any final encryption/decryption output should be written to I<out> and the
 amount of data written to I<*outl> which should not exceed I<outsize> bytes.
 The same expectations apply to I<outsize> as documented for
 L<EVP_EncryptFinal(3)> and L<EVP_DecryptFinal(3)>.

 OSSL_FUNC_cipher_cipher() performs encryption/decryption using the provider side cipher
 context in the I<cctx> parameter that should have been previously initialised via
 a call to OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init().
 This should call the raw underlying cipher function without any padding.
 This will be invoked in the provider as a result of the application calling
 L<EVP_Cipher(3)>.
 The application is responsible for ensuring that the input is a multiple of the
 block length.
 The data to be encrypted/decrypted will be in I<in>, and it will be I<inl> bytes
 in length.
 The output from the encryption/decryption should be stored in I<out> and the
 amount of data stored should be put in I<*outl> which should be no more than
 I<outsize> bytes.

 =head2 Cipher Parameters

 See L<OSSL_PARAM(3)> for further details on the parameters structure used by
 these functions.

 OSSL_FUNC_cipher_get_params() gets details of the algorithm implementation
 and stores them in I<params>.

 OSSL_FUNC_cipher_set_ctx_params() sets cipher operation parameters for the
 provider side cipher context I<cctx> to I<params>.
 Any parameter settings are additional to any that were previously set.
 Passing NULL for I<params> should return true.

 OSSL_FUNC_cipher_get_ctx_params() gets cipher operation details details from
 the given provider side cipher context I<cctx> and stores them in I<params>.
 Passing NULL for I<params> should return true.

 OSSL_FUNC_cipher_gettable_params(), OSSL_FUNC_cipher_gettable_ctx_params(),
 and OSSL_FUNC_cipher_settable_ctx_params() all return constant B<OSSL_PARAM>
 arrays as descriptors of the parameters that OSSL_FUNC_cipher_get_params(),
 OSSL_FUNC_cipher_get_ctx_params(), and OSSL_FUNC_cipher_set_ctx_params()
 can handle, respectively.  OSSL_FUNC_cipher_gettable_ctx_params() and
 OSSL_FUNC_cipher_settable_ctx_params() will return the parameters associated
 with the provider side context I<cctx> in its current state if it is
 not NULL.  Otherwise, they return the parameters associated with the
 provider side algorithm I<provctx>.

 Parameters currently recognised by built-in ciphers are listed in
 L<EVP_EncryptInit(3)/PARAMETERS>.
 Not all parameters are relevant to, or are understood by all ciphers.

 =head1 RETURN VALUES

 OSSL_FUNC_cipher_newctx() and OSSL_FUNC_cipher_dupctx() should return the newly created
 provider side cipher context, or NULL on failure.

 OSSL_FUNC_cipher_encrypt_init(), OSSL_FUNC_cipher_decrypt_init(), OSSL_FUNC_cipher_update(),
 OSSL_FUNC_cipher_final(), OSSL_FUNC_cipher_cipher(), OSSL_FUNC_cipher_get_params(),
 OSSL_FUNC_cipher_get_ctx_params() and OSSL_FUNC_cipher_set_ctx_params() should return 1 for
 success or 0 on error.

 OSSL_FUNC_cipher_gettable_params(), OSSL_FUNC_cipher_gettable_ctx_params() and
 OSSL_FUNC_cipher_settable_ctx_params() should return a constant B<OSSL_PARAM>
 array, or NULL if none is offered.

 =head1 SEE ALSO

 L<provider(7)>, L<OSSL_PROVIDER-FIPS(7)>, L<OSSL_PROVIDER-default(7)>,
 L<OSSL_PROVIDER-legacy(7)>,
 L<EVP_CIPHER-AES(7)>, L<EVP_CIPHER-ARIA(7)>, L<EVP_CIPHER-BLOWFISH(7)>,
 L<EVP_CIPHER-CAMELLIA(7)>, L<EVP_CIPHER-CAST(7)>, L<EVP_CIPHER-CHACHA(7)>,
 L<EVP_CIPHER-DES(7)>, L<EVP_CIPHER-IDEA(7)>, L<EVP_CIPHER-RC2(7)>,
 L<EVP_CIPHER-RC4(7)>, L<EVP_CIPHER-RC5(7)>, L<EVP_CIPHER-SEED(7)>,
 L<EVP_CIPHER-SM4(7)>,
 L<life_cycle-cipher(7)>, L<EVP_EncryptInit(3)>

 =head1 HISTORY

 The provider CIPHER interface was introduced in OpenSSL 3.0.

 =head1 COPYRIGHT

 Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.

 Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy
 in the file LICENSE in the source distribution or at
 L<https://www.openssl.org/source/license.html>.

 =cut
	=pod

	=head1 NAME

	provider-cipher - The cipher library E<lt>-E<gt> provider functions

	=head1 SYNOPSIS

	=for openssl multiple includes

	#include <openssl/core_dispatch.h>
	#include <openssl/core_names.h>

	/*
	* None of these are actual functions, but are displayed like this for
	* the function signatures for functions that are offered as function
	* pointers in OSSL_DISPATCH arrays.
	*/

	/* Context management */
	void OSSL_FUNC_cipher_newctx(void provctx);
	void OSSL_FUNC_cipher_freectx(void *cctx);
	void OSSL_FUNC_cipher_dupctx(void cctx);

	/* Encryption/decryption */
	int OSSL_FUNC_cipher_encrypt_init(void cctx, const unsigned char key,
	size_t keylen, const unsigned char *iv,
	size_t ivlen, const OSSL_PARAM params[]);
	int OSSL_FUNC_cipher_decrypt_init(void cctx, const unsigned char key,
	size_t keylen, const unsigned char *iv,
	size_t ivlen, const OSSL_PARAM params[]);
	int OSSL_FUNC_cipher_update(void cctx, unsigned char out, size_t *outl,
	size_t outsize, const unsigned char *in, size_t inl);
	int OSSL_FUNC_cipher_final(void cctx, unsigned char out, size_t *outl,
	size_t outsize);
	int OSSL_FUNC_cipher_cipher(void cctx, unsigned char out, size_t *outl,
	size_t outsize, const unsigned char *in, size_t inl);

	/* Cipher parameter descriptors */
	const OSSL_PARAM OSSL_FUNC_cipher_gettable_params(void provctx);

	/* Cipher operation parameter descriptors */
	const OSSL_PARAM OSSL_FUNC_cipher_gettable_ctx_params(void cctx,
	void *provctx);
	const OSSL_PARAM OSSL_FUNC_cipher_settable_ctx_params(void cctx,
	void *provctx);

	/* Cipher parameters */
	int OSSL_FUNC_cipher_get_params(OSSL_PARAM params[]);

	/* Cipher operation parameters */
	int OSSL_FUNC_cipher_get_ctx_params(void *cctx, OSSL_PARAM params[]);
	int OSSL_FUNC_cipher_set_ctx_params(void *cctx, const OSSL_PARAM params[]);

	=head1 DESCRIPTION

	This documentation is primarily aimed at provider authors. See L<provider(7)>
	for further information.

	The CIPHER operation enables providers to implement cipher algorithms and make
	them available to applications via the API functions L<EVP_EncryptInit_ex(3)>,
	L<EVP_EncryptUpdate(3)> and L<EVP_EncryptFinal(3)> (as well as the decrypt
	equivalents and other related functions).

	All "functions" mentioned here are passed as function pointers between
	F<libcrypto> and the provider in B<OSSL_DISPATCH> arrays via
	B<OSSL_ALGORITHM> arrays that are returned by the provider's
	provider_query_operation() function
	(see L<provider-base(7)/Provider Functions>).

	All these "functions" have a corresponding function type definition
	named B<OSSL_FUNC_{name}_fn>, and a helper function to retrieve the
	function pointer from an B<OSSL_DISPATCH> element named
	B<OSSL_FUNC_{name}>.
	For example, the "function" OSSL_FUNC_cipher_newctx() has these:

	typedef void (OSSL_OSSL_FUNC_cipher_newctx_fn)(void provctx);
	static ossl_inline OSSL_OSSL_FUNC_cipher_newctx_fn
	OSSL_FUNC_cipher_newctx(const OSSL_DISPATCH *opf);

	B<OSSL_DISPATCH> arrays are indexed by numbers that are provided as
	macros in L<openssl-core_dispatch.h(7)>, as follows:

	OSSL_FUNC_cipher_newctx OSSL_FUNC_CIPHER_NEWCTX
	OSSL_FUNC_cipher_freectx OSSL_FUNC_CIPHER_FREECTX
	OSSL_FUNC_cipher_dupctx OSSL_FUNC_CIPHER_DUPCTX

	OSSL_FUNC_cipher_encrypt_init OSSL_FUNC_CIPHER_ENCRYPT_INIT
	OSSL_FUNC_cipher_decrypt_init OSSL_FUNC_CIPHER_DECRYPT_INIT
	OSSL_FUNC_cipher_update OSSL_FUNC_CIPHER_UPDATE
	OSSL_FUNC_cipher_final OSSL_FUNC_CIPHER_FINAL
	OSSL_FUNC_cipher_cipher OSSL_FUNC_CIPHER_CIPHER

	OSSL_FUNC_cipher_get_params OSSL_FUNC_CIPHER_GET_PARAMS
	OSSL_FUNC_cipher_get_ctx_params OSSL_FUNC_CIPHER_GET_CTX_PARAMS
	OSSL_FUNC_cipher_set_ctx_params OSSL_FUNC_CIPHER_SET_CTX_PARAMS

	OSSL_FUNC_cipher_gettable_params OSSL_FUNC_CIPHER_GETTABLE_PARAMS
	OSSL_FUNC_cipher_gettable_ctx_params OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS
	OSSL_FUNC_cipher_settable_ctx_params OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS

	A cipher algorithm implementation may not implement all of these functions.
	In order to be a consistent set of functions there must at least be a complete
	set of "encrypt" functions, or a complete set of "decrypt" functions, or a
	single "cipher" function.
	In all cases both the OSSL_FUNC_cipher_newctx and OSSL_FUNC_cipher_freectx functions must be
	present.
	All other functions are optional.

	=head2 Context Management Functions

	OSSL_FUNC_cipher_newctx() should create and return a pointer to a provider side
	structure for holding context information during a cipher operation.
	A pointer to this context will be passed back in a number of the other cipher
	operation function calls.
	The parameter I<provctx> is the provider context generated during provider
	initialisation (see L<provider(7)>).

	OSSL_FUNC_cipher_freectx() is passed a pointer to the provider side cipher context in
	the I<cctx> parameter.
	This function should free any resources associated with that context.

	OSSL_FUNC_cipher_dupctx() should duplicate the provider side cipher context in the
	I<cctx> parameter and return the duplicate copy.

	=head2 Encryption/Decryption Functions

	OSSL_FUNC_cipher_encrypt_init() initialises a cipher operation for encryption given a
	newly created provider side cipher context in the I<cctx> parameter.
	The key to be used is given in I<key> which is I<keylen> bytes long.
	The IV to be used is given in I<iv> which is I<ivlen> bytes long.
	The I<params>, if not NULL, should be set on the context in a manner similar to
	using OSSL_FUNC_cipher_set_ctx_params().

	OSSL_FUNC_cipher_decrypt_init() is the same as OSSL_FUNC_cipher_encrypt_init() except that it
	initialises the context for a decryption operation.

	OSSL_FUNC_cipher_update() is called to supply data to be encrypted/decrypted as part of
	a previously initialised cipher operation.
	The I<cctx> parameter contains a pointer to a previously initialised provider
	side context.
	OSSL_FUNC_cipher_update() should encrypt/decrypt I<inl> bytes of data at the location
	pointed to by I<in>.
	The encrypted data should be stored in I<out> and the amount of data written to
	I<*outl> which should not exceed I<outsize> bytes.
	OSSL_FUNC_cipher_update() may be called multiple times for a single cipher operation.
	It is the responsibility of the cipher implementation to handle input lengths
	that are not multiples of the block length.
	In such cases a cipher implementation will typically cache partial blocks of
	input data until a complete block is obtained.
	I<out> may be the same location as I<in> but it should not partially overlap.
	The same expectations apply to I<outsize> as documented for
	L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)>.

	OSSL_FUNC_cipher_final() completes an encryption or decryption started through previous
	OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init(), and OSSL_FUNC_cipher_update()
	calls.
	The I<cctx> parameter contains a pointer to the provider side context.
	Any final encryption/decryption output should be written to I<out> and the
	amount of data written to I<*outl> which should not exceed I<outsize> bytes.
	The same expectations apply to I<outsize> as documented for
	L<EVP_EncryptFinal(3)> and L<EVP_DecryptFinal(3)>.

	OSSL_FUNC_cipher_cipher() performs encryption/decryption using the provider side cipher
	context in the I<cctx> parameter that should have been previously initialised via
	a call to OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init().
	This should call the raw underlying cipher function without any padding.
	This will be invoked in the provider as a result of the application calling
	L<EVP_Cipher(3)>.
	The application is responsible for ensuring that the input is a multiple of the
	block length.
	The data to be encrypted/decrypted will be in I<in>, and it will be I<inl> bytes
	in length.
	The output from the encryption/decryption should be stored in I<out> and the
	amount of data stored should be put in I<*outl> which should be no more than
	I<outsize> bytes.

	=head2 Cipher Parameters

	See L<OSSL_PARAM(3)> for further details on the parameters structure used by
	these functions.

	OSSL_FUNC_cipher_get_params() gets details of the algorithm implementation
	and stores them in I<params>.

	OSSL_FUNC_cipher_set_ctx_params() sets cipher operation parameters for the
	provider side cipher context I<cctx> to I<params>.
	Any parameter settings are additional to any that were previously set.
	Passing NULL for I<params> should return true.

	OSSL_FUNC_cipher_get_ctx_params() gets cipher operation details details from
	the given provider side cipher context I<cctx> and stores them in I<params>.
	Passing NULL for I<params> should return true.

	OSSL_FUNC_cipher_gettable_params(), OSSL_FUNC_cipher_gettable_ctx_params(),
	and OSSL_FUNC_cipher_settable_ctx_params() all return constant B<OSSL_PARAM>
	arrays as descriptors of the parameters that OSSL_FUNC_cipher_get_params(),
	OSSL_FUNC_cipher_get_ctx_params(), and OSSL_FUNC_cipher_set_ctx_params()
	can handle, respectively. OSSL_FUNC_cipher_gettable_ctx_params() and
	OSSL_FUNC_cipher_settable_ctx_params() will return the parameters associated
	with the provider side context I<cctx> in its current state if it is
	not NULL. Otherwise, they return the parameters associated with the
	provider side algorithm I<provctx>.

	Parameters currently recognised by built-in ciphers are listed in
	L<EVP_EncryptInit(3)/PARAMETERS>.
	Not all parameters are relevant to, or are understood by all ciphers.

	=head1 RETURN VALUES

	OSSL_FUNC_cipher_newctx() and OSSL_FUNC_cipher_dupctx() should return the newly created
	provider side cipher context, or NULL on failure.

	OSSL_FUNC_cipher_encrypt_init(), OSSL_FUNC_cipher_decrypt_init(), OSSL_FUNC_cipher_update(),
	OSSL_FUNC_cipher_final(), OSSL_FUNC_cipher_cipher(), OSSL_FUNC_cipher_get_params(),
	OSSL_FUNC_cipher_get_ctx_params() and OSSL_FUNC_cipher_set_ctx_params() should return 1 for
	success or 0 on error.

	OSSL_FUNC_cipher_gettable_params(), OSSL_FUNC_cipher_gettable_ctx_params() and
	OSSL_FUNC_cipher_settable_ctx_params() should return a constant B<OSSL_PARAM>
	array, or NULL if none is offered.

	=head1 SEE ALSO

	L<provider(7)>, L<OSSL_PROVIDER-FIPS(7)>, L<OSSL_PROVIDER-default(7)>,
	L<OSSL_PROVIDER-legacy(7)>,
	L<EVP_CIPHER-AES(7)>, L<EVP_CIPHER-ARIA(7)>, L<EVP_CIPHER-BLOWFISH(7)>,
	L<EVP_CIPHER-CAMELLIA(7)>, L<EVP_CIPHER-CAST(7)>, L<EVP_CIPHER-CHACHA(7)>,
	L<EVP_CIPHER-DES(7)>, L<EVP_CIPHER-IDEA(7)>, L<EVP_CIPHER-RC2(7)>,
	L<EVP_CIPHER-RC4(7)>, L<EVP_CIPHER-RC5(7)>, L<EVP_CIPHER-SEED(7)>,
	L<EVP_CIPHER-SM4(7)>,
	L<life_cycle-cipher(7)>, L<EVP_EncryptInit(3)>

	=head1 HISTORY

	The provider CIPHER interface was introduced in OpenSSL 3.0.

	=head1 COPYRIGHT

	Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.

	Licensed under the Apache License 2.0 (the "License"). You may not use
	this file except in compliance with the License. You can obtain a copy
	in the file LICENSE in the source distribution or at
	L<https://www.openssl.org/source/license.html>.

	=cut