252 lines
11 KiB
Plaintext
252 lines
11 KiB
Plaintext
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=pod
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=head1 NAME
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provider-cipher - The cipher library E<lt>-E<gt> provider functions
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=head1 SYNOPSIS
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=for openssl multiple includes
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#include <openssl/core_dispatch.h>
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#include <openssl/core_names.h>
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/*
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* None of these are actual functions, but are displayed like this for
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* the function signatures for functions that are offered as function
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* pointers in OSSL_DISPATCH arrays.
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*/
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/* Context management */
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void *OSSL_FUNC_cipher_newctx(void *provctx);
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void OSSL_FUNC_cipher_freectx(void *cctx);
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void *OSSL_FUNC_cipher_dupctx(void *cctx);
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/* Encryption/decryption */
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int OSSL_FUNC_cipher_encrypt_init(void *cctx, const unsigned char *key,
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size_t keylen, const unsigned char *iv,
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size_t ivlen, const OSSL_PARAM params[]);
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int OSSL_FUNC_cipher_decrypt_init(void *cctx, const unsigned char *key,
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size_t keylen, const unsigned char *iv,
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size_t ivlen, const OSSL_PARAM params[]);
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int OSSL_FUNC_cipher_update(void *cctx, unsigned char *out, size_t *outl,
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size_t outsize, const unsigned char *in, size_t inl);
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int OSSL_FUNC_cipher_final(void *cctx, unsigned char *out, size_t *outl,
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size_t outsize);
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int OSSL_FUNC_cipher_cipher(void *cctx, unsigned char *out, size_t *outl,
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size_t outsize, const unsigned char *in, size_t inl);
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/* Cipher parameter descriptors */
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const OSSL_PARAM *OSSL_FUNC_cipher_gettable_params(void *provctx);
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/* Cipher operation parameter descriptors */
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const OSSL_PARAM *OSSL_FUNC_cipher_gettable_ctx_params(void *cctx,
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void *provctx);
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const OSSL_PARAM *OSSL_FUNC_cipher_settable_ctx_params(void *cctx,
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void *provctx);
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/* Cipher parameters */
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int OSSL_FUNC_cipher_get_params(OSSL_PARAM params[]);
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/* Cipher operation parameters */
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int OSSL_FUNC_cipher_get_ctx_params(void *cctx, OSSL_PARAM params[]);
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int OSSL_FUNC_cipher_set_ctx_params(void *cctx, const OSSL_PARAM params[]);
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=head1 DESCRIPTION
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This documentation is primarily aimed at provider authors. See L<provider(7)>
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for further information.
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The CIPHER operation enables providers to implement cipher algorithms and make
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them available to applications via the API functions L<EVP_EncryptInit_ex(3)>,
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L<EVP_EncryptUpdate(3)> and L<EVP_EncryptFinal(3)> (as well as the decrypt
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equivalents and other related functions).
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All "functions" mentioned here are passed as function pointers between
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F<libcrypto> and the provider in L<OSSL_DISPATCH(3)> arrays via
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L<OSSL_ALGORITHM(3)> arrays that are returned by the provider's
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provider_query_operation() function
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(see L<provider-base(7)/Provider Functions>).
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All these "functions" have a corresponding function type definition
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named B<OSSL_FUNC_{name}_fn>, and a helper function to retrieve the
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function pointer from an L<OSSL_DISPATCH(3)> element named
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B<OSSL_FUNC_{name}>.
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For example, the "function" OSSL_FUNC_cipher_newctx() has these:
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typedef void *(OSSL_FUNC_cipher_newctx_fn)(void *provctx);
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static ossl_inline OSSL_FUNC_cipher_newctx_fn
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OSSL_FUNC_cipher_newctx(const OSSL_DISPATCH *opf);
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L<OSSL_DISPATCH(3)> arrays are indexed by numbers that are provided as
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macros in L<openssl-core_dispatch.h(7)>, as follows:
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OSSL_FUNC_cipher_newctx OSSL_FUNC_CIPHER_NEWCTX
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OSSL_FUNC_cipher_freectx OSSL_FUNC_CIPHER_FREECTX
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OSSL_FUNC_cipher_dupctx OSSL_FUNC_CIPHER_DUPCTX
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OSSL_FUNC_cipher_encrypt_init OSSL_FUNC_CIPHER_ENCRYPT_INIT
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OSSL_FUNC_cipher_decrypt_init OSSL_FUNC_CIPHER_DECRYPT_INIT
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OSSL_FUNC_cipher_update OSSL_FUNC_CIPHER_UPDATE
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OSSL_FUNC_cipher_final OSSL_FUNC_CIPHER_FINAL
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OSSL_FUNC_cipher_cipher OSSL_FUNC_CIPHER_CIPHER
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OSSL_FUNC_cipher_get_params OSSL_FUNC_CIPHER_GET_PARAMS
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OSSL_FUNC_cipher_get_ctx_params OSSL_FUNC_CIPHER_GET_CTX_PARAMS
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OSSL_FUNC_cipher_set_ctx_params OSSL_FUNC_CIPHER_SET_CTX_PARAMS
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OSSL_FUNC_cipher_gettable_params OSSL_FUNC_CIPHER_GETTABLE_PARAMS
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OSSL_FUNC_cipher_gettable_ctx_params OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS
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OSSL_FUNC_cipher_settable_ctx_params OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS
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A cipher algorithm implementation may not implement all of these functions.
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In order to be a consistent set of functions there must at least be a complete
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set of "encrypt" functions, or a complete set of "decrypt" functions, or a
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single "cipher" function.
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In all cases both the OSSL_FUNC_cipher_newctx and OSSL_FUNC_cipher_freectx functions must be
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present.
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All other functions are optional.
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=head2 Context Management Functions
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OSSL_FUNC_cipher_newctx() should create and return a pointer to a provider side
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structure for holding context information during a cipher operation.
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A pointer to this context will be passed back in a number of the other cipher
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operation function calls.
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The parameter I<provctx> is the provider context generated during provider
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initialisation (see L<provider(7)>).
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OSSL_FUNC_cipher_freectx() is passed a pointer to the provider side cipher context in
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the I<cctx> parameter.
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This function should free any resources associated with that context.
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OSSL_FUNC_cipher_dupctx() should duplicate the provider side cipher context in the
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I<cctx> parameter and return the duplicate copy.
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=head2 Encryption/Decryption Functions
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OSSL_FUNC_cipher_encrypt_init() initialises a cipher operation for encryption given a
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newly created provider side cipher context in the I<cctx> parameter.
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The key to be used is given in I<key> which is I<keylen> bytes long.
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The IV to be used is given in I<iv> which is I<ivlen> bytes long.
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The I<params>, if not NULL, should be set on the context in a manner similar to
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using OSSL_FUNC_cipher_set_ctx_params().
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OSSL_FUNC_cipher_decrypt_init() is the same as OSSL_FUNC_cipher_encrypt_init() except that it
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initialises the context for a decryption operation.
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OSSL_FUNC_cipher_update() is called to supply data to be encrypted/decrypted as part of
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a previously initialised cipher operation.
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The I<cctx> parameter contains a pointer to a previously initialised provider
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side context.
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OSSL_FUNC_cipher_update() should encrypt/decrypt I<inl> bytes of data at the location
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pointed to by I<in>.
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The encrypted data should be stored in I<out> and the amount of data written to
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I<*outl> which should not exceed I<outsize> bytes.
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OSSL_FUNC_cipher_update() may be called multiple times for a single cipher operation.
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It is the responsibility of the cipher implementation to handle input lengths
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that are not multiples of the block length.
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In such cases a cipher implementation will typically cache partial blocks of
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input data until a complete block is obtained.
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The pointers I<out> and I<in> may point to the same location, in which
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case the encryption must be done in-place. If I<out> and I<in> point to different
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locations, the requirements of L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)>
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guarantee that the two buffers are disjoint.
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Similarly, the requirements of L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)>
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ensure that the buffer pointed to by I<out> contains sufficient room for the
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operation being performed.
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OSSL_FUNC_cipher_final() completes an encryption or decryption started through previous
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OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init(), and OSSL_FUNC_cipher_update()
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calls.
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The I<cctx> parameter contains a pointer to the provider side context.
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Any final encryption/decryption output should be written to I<out> and the
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amount of data written to I<*outl> which should not exceed I<outsize> bytes.
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The same expectations apply to I<outsize> as documented for
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L<EVP_EncryptFinal(3)> and L<EVP_DecryptFinal(3)>.
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OSSL_FUNC_cipher_cipher() performs encryption/decryption using the provider side cipher
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context in the I<cctx> parameter that should have been previously initialised via
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a call to OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init().
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This should call the raw underlying cipher function without any padding.
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This will be invoked in the provider as a result of the application calling
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L<EVP_Cipher(3)>.
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The application is responsible for ensuring that the input is a multiple of the
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block length.
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The data to be encrypted/decrypted will be in I<in>, and it will be I<inl> bytes
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in length.
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The output from the encryption/decryption should be stored in I<out> and the
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amount of data stored should be put in I<*outl> which should be no more than
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I<outsize> bytes.
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=head2 Cipher Parameters
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See L<OSSL_PARAM(3)> for further details on the parameters structure used by
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these functions.
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OSSL_FUNC_cipher_get_params() gets details of the algorithm implementation
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and stores them in I<params>.
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OSSL_FUNC_cipher_set_ctx_params() sets cipher operation parameters for the
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provider side cipher context I<cctx> to I<params>.
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Any parameter settings are additional to any that were previously set.
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Passing NULL for I<params> should return true.
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OSSL_FUNC_cipher_get_ctx_params() gets cipher operation details details from
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the given provider side cipher context I<cctx> and stores them in I<params>.
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Passing NULL for I<params> should return true.
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OSSL_FUNC_cipher_gettable_params(), OSSL_FUNC_cipher_gettable_ctx_params(),
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and OSSL_FUNC_cipher_settable_ctx_params() all return constant L<OSSL_PARAM(3)>
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arrays as descriptors of the parameters that OSSL_FUNC_cipher_get_params(),
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OSSL_FUNC_cipher_get_ctx_params(), and OSSL_FUNC_cipher_set_ctx_params()
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can handle, respectively. OSSL_FUNC_cipher_gettable_ctx_params() and
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OSSL_FUNC_cipher_settable_ctx_params() will return the parameters associated
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with the provider side context I<cctx> in its current state if it is
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not NULL. Otherwise, they return the parameters associated with the
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provider side algorithm I<provctx>.
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Parameters currently recognised by built-in ciphers are listed in
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L<EVP_EncryptInit(3)/PARAMETERS>.
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Not all parameters are relevant to, or are understood by all ciphers.
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=head1 RETURN VALUES
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OSSL_FUNC_cipher_newctx() and OSSL_FUNC_cipher_dupctx() should return the newly created
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provider side cipher context, or NULL on failure.
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OSSL_FUNC_cipher_encrypt_init(), OSSL_FUNC_cipher_decrypt_init(), OSSL_FUNC_cipher_update(),
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OSSL_FUNC_cipher_final(), OSSL_FUNC_cipher_cipher(), OSSL_FUNC_cipher_get_params(),
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OSSL_FUNC_cipher_get_ctx_params() and OSSL_FUNC_cipher_set_ctx_params() should return 1 for
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success or 0 on error.
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OSSL_FUNC_cipher_gettable_params(), OSSL_FUNC_cipher_gettable_ctx_params() and
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OSSL_FUNC_cipher_settable_ctx_params() should return a constant L<OSSL_PARAM(3)>
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array, or NULL if none is offered.
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=head1 SEE ALSO
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L<provider(7)>, L<OSSL_PROVIDER-FIPS(7)>, L<OSSL_PROVIDER-default(7)>,
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L<OSSL_PROVIDER-legacy(7)>,
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L<EVP_CIPHER-AES(7)>, L<EVP_CIPHER-ARIA(7)>, L<EVP_CIPHER-BLOWFISH(7)>,
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L<EVP_CIPHER-CAMELLIA(7)>, L<EVP_CIPHER-CAST(7)>, L<EVP_CIPHER-CHACHA(7)>,
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L<EVP_CIPHER-DES(7)>, L<EVP_CIPHER-IDEA(7)>, L<EVP_CIPHER-RC2(7)>,
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L<EVP_CIPHER-RC4(7)>, L<EVP_CIPHER-RC5(7)>, L<EVP_CIPHER-SEED(7)>,
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L<EVP_CIPHER-SM4(7)>, L<EVP_CIPHER-NULL(7)>,
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L<life_cycle-cipher(7)>, L<EVP_EncryptInit(3)>
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=head1 HISTORY
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The provider CIPHER interface was introduced in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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