mirror of
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bd6e7fb7a7
Reviewed-by: Shane Lontis <shane.lontis@oracle.com> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14756)
504 lines
21 KiB
Plaintext
504 lines
21 KiB
Plaintext
=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 B<OSSL_DISPATCH> arrays via
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B<OSSL_ALGORITHM> 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 B<OSSL_DISPATCH> 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_OSSL_FUNC_cipher_newctx_fn)(void *provctx);
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static ossl_inline OSSL_OSSL_FUNC_cipher_newctx_fn
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OSSL_FUNC_cipher_newctx(const OSSL_DISPATCH *opf);
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B<OSSL_DISPATCH> 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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I<out> may be the same location as I<in> but it should not partially overlap.
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The same expectations apply to I<outsize> as documented for
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L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)>.
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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 B<OSSL_PARAM>
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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 as follows. Not all
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parameters are relevant to, or are understood by all ciphers:
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=over 4
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=item "padding" (B<OSSL_CIPHER_PARAM_PADDING>) <unsigned integer>
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Sets the padding mode for the associated cipher ctx.
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Setting a value of 1 will turn padding on.
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Setting a value of 0 will turn padding off.
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=item "mode" (B<OSSL_CIPHER_PARAM_MODE>) <unsigned integer>
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Gets the mode for the associated cipher algorithm.
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See L<EVP_CIPHER_mode(3)> for a list of valid modes.
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=item "blocksize" (B<OSSL_CIPHER_PARAM_BLOCK_SIZE>) <unsigned integer>
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Gets the block size for the associated cipher algorithm.
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The block size should be 1 for stream ciphers.
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Note that the block size for a cipher may be different to the block size for
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the underlying encryption/decryption primitive.
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For example AES in CTR mode has a block size of 1 (because it operates like a
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stream cipher), even though AES has a block size of 16.
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The length of the "blocksize" parameter should not exceed that of a B<size_t>.
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=item "aead" (B<OSSL_CIPHER_PARAM_AEAD>) <integer>
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Gets 1 if this is an AEAD cipher algorithm, otherwise it gets 0.
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=item "custom-iv" (B<OSSL_CIPHER_PARAM_CUSTOM_IV>) <integer>
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Gets 1 if the cipher algorithm has a custom IV, otherwise it gets 0.
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Storing and initializing the IV is left entirely to the implementation, if a
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custom IV is used.
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=item "cts" (B<OSSL_CIPHER_PARAM_CTS>) <integer>
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Gets 1 if the cipher algorithm uses ciphertext stealing, otherwise it gets 0.
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This is currently used to indicate that the cipher is a one shot that only
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allows a single call to EVP_CipherUpdate().
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=item "tls-multi" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK>) <integer>
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Gets 1 if the cipher algorithm supports interleaving of crypto blocks, otherwise
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it gets 0. The interleaving is an optimization only applicable to certain
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TLS ciphers.
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=item "keylen" (B<OSSL_CIPHER_PARAM_KEYLEN>) <unsigned integer>
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Gets the key length for the associated cipher algorithm.
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This can also be used to get or set the key length for the associated cipher
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ctx.
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The length of the "keylen" parameter should not exceed that of a B<size_t>.
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=item "ivlen" (B<OSSL_CIPHER_PARAM_IVLEN>) <unsigned integer>
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Gets the IV length for the associated cipher algorithm.
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The length of the "ivlen" parameter should not exceed that of a B<size_t>.
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=item "iv" (B<OSSL_CIPHER_PARAM_IV>) <octet string OR octet ptr>
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Gets the IV used to initialize the associated cipher ctx.
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=item "updated-iv" (B<OSSL_CIPHER_PARAM_UPDATED_IV>) <octet string OR octet ptr>
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Gets the updated pseudo-IV state for the associated cipher ctx, e.g.,
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the previous ciphertext block for CBC mode or the iteratively encrypted IV
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value for OFB mode. Note that octet pointer access is deprecated and is
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provided only for backwards compatibility with historical libcrypto APIs.
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=item "num" (B<OSSL_CIPHER_PARAM_NUM>) <unsigned integer>
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Gets or sets the cipher specific "num" parameter for the associated cipher ctx.
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Built-in ciphers typically use this to track how much of the current underlying
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block has been "used" already.
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=item "tag" (B<OSSL_CIPHER_PARAM_AEAD_TAG>) <octet string>
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Gets or sets the AEAD tag for the associated cipher ctx.
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See L<EVP_EncryptInit(3)/AEAD Interface>.
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=item "taglen" (B<OSSL_CIPHER_PARAM_AEAD_TAGLEN>) <unsigned integer>
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Gets the tag length to be used for an AEAD cipher for the associated cipher ctx.
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It gets a default value if it has not been set.
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The length of the "taglen" parameter should not exceed that of a B<size_t>.
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=item "tlsaad" (B<OSSL_CIPHER_PARAM_AEAD_TLS1_AAD>) <octet string>
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Sets TLSv1.2 AAD information for the associated cipher ctx.
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TLSv1.2 AAD information is always 13 bytes in length and is as defined for the
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"additional_data" field described in section 6.2.3.3 of RFC5246.
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=item "tlsaadpad" (B<OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD>) <unsigned integer>
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Gets the length of the tag that will be added to a TLS record for the AEAD
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tag for the associated cipher ctx.
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The length of the "tlsaadpad" parameter should not exceed that of a B<size_t>.
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=item "tlsivfixed" (B<OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED>) <octet string>
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Sets the fixed portion of an IV for an AEAD cipher used in a TLS record
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encryption/ decryption for the associated cipher ctx.
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TLS record encryption/decryption always occurs "in place" so that the input and
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output buffers are always the same memory location.
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AEAD IVs in TLSv1.2 consist of an implicit "fixed" part and an explicit part
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that varies with every record.
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Setting a TLS fixed IV changes a cipher to encrypt/decrypt TLS records.
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TLS records are encrypted/decrypted using a single OSSL_FUNC_cipher_cipher call per
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record.
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For a record decryption the first bytes of the input buffer will be the explicit
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part of the IV and the final bytes of the input buffer will be the AEAD tag.
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The length of the explicit part of the IV and the tag length will depend on the
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cipher in use and will be defined in the RFC for the relevant ciphersuite.
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In order to allow for "in place" decryption the plaintext output should be
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written to the same location in the output buffer that the ciphertext payload
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was read from, i.e. immediately after the explicit IV.
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When encrypting a record the first bytes of the input buffer will be empty to
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allow space for the explicit IV, as will the final bytes where the tag will
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be written.
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The length of the input buffer will include the length of the explicit IV, the
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payload, and the tag bytes.
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The cipher implementation should generate the explicit IV and write it to the
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beginning of the output buffer, do "in place" encryption of the payload and
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write that to the output buffer, and finally add the tag onto the end of the
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output buffer.
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Whether encrypting or decrypting the value written to I<*outl> in the
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OSSL_FUNC_cipher_cipher call should be the length of the payload excluding the explicit
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IV length and the tag length.
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=item "ivlen" (B<OSSL_CIPHER_PARAM_AEAD_IVLEN>) <unsigned integer>
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Sets the IV length to be used for an AEAD cipher for the associated cipher ctx.
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The length of the "ivlen" parameter should not exceed that of a B<size_t>.
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=item "mackey" (B<OSSL_CIPHER_PARAM_AEAD_MAC_KEY>) <octet string>
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Sets the MAC key used by composite AEAD ciphers such as AES-CBC-HMAC-SHA256.
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=item "randkey" (B<OSSL_CIPHER_PARAM_RANDOM_KEY>) <octet string>
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Gets a implementation specific randomly generated key for the associated
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cipher ctx. This is currently only supported by 3DES (which sets the key to
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odd parity).
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=item "alg_id_param" (B<OSSL_CIPHER_PARAM_ALG_ID>) <octet string>
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Used to pass the DER encoded AlgorithmIdentifier parameter to or from
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the cipher implementation. Functions like L<EVP_CIPHER_param_to_asn1(3)>
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and L<EVP_CIPHER_asn1_to_param(3)> use this parameter for any implementation
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that has the flag B<EVP_CIPH_FLAG_CUSTOM_ASN1> set.
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=item "rounds" (B<OSSL_CIPHER_PARAM_ROUNDS>) <unsigned integer>
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Sets or gets the number of rounds to be used for a cipher.
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This is used by the RC5 cipher.
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=item "keybits" (B<OSSL_CIPHER_PARAM_RC2_KEYBITS>) <unsigned integer>
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Gets or sets the effective keybits used for a RC2 cipher.
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The length of the "keybits" parameter should not exceed that of a B<size_t>.
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=item "speed" (B<OSSL_CIPHER_PARAM_SPEED>) <unsigned integer>
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Sets the speed option for the associated cipher ctx. This is only supported
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by AES SIV ciphers which disallow multiple operations by default.
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Setting "speed" to 1 allows another encrypt or decrypt operation to be
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performed. This is used for performance testing.
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=item "tlsivgen" (B<OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN>) <octet string>
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Gets the invocation field generated for encryption.
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Can only be called after "tlsivfixed" is set.
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This is only used for GCM mode.
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=item "tlsivinv" (B<OSSL_CIPHER_PARAM_AEAD_TLS1_SET_IV_INV>) <octet string>
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Sets the invocation field used for decryption.
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Can only be called after "tlsivfixed" is set.
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This is only used for GCM mode.
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=item "tls1multi_enc" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC>) <octet string>
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Triggers a multiblock tls1 encrypt operation for a tls1 aware cipher that supports
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sending 4 or 8 records in one go.
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The cipher performs both the MAC and encrypt stages and constructs the record
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headers itself.
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"tls1multi_enc" supplies the output buffer for the encrypt operation,
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"tls1multi_encin" & "tls1multi_interleave" must also be set in order to supply
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values to the encrypt operation.
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=item "tls1multi_enclen" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_LEN>) <unsigned integer>
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Get the total length of the record returned from the "tls1multi_enc" operation.
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=item "tls1multi_interleave" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_INTERLEAVE>) <unsigned integer>
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Sets or gets the number of records being sent in one go for a tls1 multiblock
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cipher operation (either 4 or 8 records).
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=item "tls1multi_encin" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_ENC_IN>) <octet string>
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Supplies the data to encrypt for a tls1 multiblock cipher operation.
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=item "tls1multi_maxsndfrag" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT>) <unsigned integer>
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Sets the maximum send fragment size for a tls1 multiblock cipher operation.
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It must be set before using "tls1multi_maxbufsz".
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The length of the "tls1multi_maxsndfrag" parameter should not exceed that of a B<size_t>.
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=item "tls1multi_maxbufsz" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE>) <unsigned integer>
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Gets the maximum record length for a tls1 multiblock cipher operation.
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The length of the "tls1multi_maxbufsz" parameter should not exceed that of a B<size_t>.
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=item "tls1multi_aad" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD>) <octet string>
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Sets the authenticated additional data used by a tls1 multiblock cipher operation.
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The supplied data consists of 13 bytes of record data containing:
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Bytes 0-7: The sequence number of the first record
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Byte 8: The record type
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Byte 9-10: The protocol version
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Byte 11-12: Input length (Always 0)
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"tls1multi_interleave" must also be set for this operation.
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=item "tls1multi_aadpacklen" (B<OSSL_CIPHER_PARAM_TLS1_MULTIBLOCK_AAD_PACKLEN>) <unsigned integer>
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Gets the result of running the "tls1multi_aad" operation.
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=item "cts_mode" (B<OSSL_CIPHER_PARAM_CTS_MODE>) <utf8 string>
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Sets the cipher text stealing mode. For all modes the output size is the same as
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|
the input size.
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Valid values for the mode are:
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=over 4
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=item "CS1"
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The NIST variant of cipher text stealing.
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For message lengths that are multiples of the block size it is equivalent to
|
|
using a "AES-CBC" cipher otherwise the second last cipher text block is a
|
|
partial block.
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=item "CS2"
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For message lengths that are multiples of the block size it is equivalent to
|
|
using a "AES-CBC" cipher, otherwise it is the same as "CS3".
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=item "CS3"
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The Kerberos5 variant of cipher text stealing which always swaps the last
|
|
cipher text block with the previous block (which may be a partial or full block
|
|
depending on the input length).
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=back
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The default is "CS1".
|
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This is only supported for "AES-128-CBC-CTS", "AES-192-CBC-CTS" and "AES-256-CBC-CTS".
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=back
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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
|
|
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(),
|
|
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.
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|
|
|
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.
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|
|
|
=head1 SEE ALSO
|
|
|
|
L<provider(7)>
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|
|
=head1 HISTORY
|
|
|
|
The provider CIPHER interface was introduced in OpenSSL 3.0.
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|
=head1 COPYRIGHT
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|
|
|
Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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|
|
|
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>.
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|
=cut
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