mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-03 13:13:30 +01:00
269 lines
11 KiB
Plaintext
269 lines
11 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
provider-asym_cipher - The asym_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_asym_cipher_newctx(void *provctx);
|
|
void OSSL_FUNC_asym_cipher_freectx(void *ctx);
|
|
void *OSSL_FUNC_asym_cipher_dupctx(void *ctx);
|
|
|
|
/* Encryption */
|
|
int OSSL_FUNC_asym_cipher_encrypt_init(void *ctx, void *provkey,
|
|
const OSSL_PARAM params[]);
|
|
int OSSL_FUNC_asym_cipher_encrypt(void *ctx, unsigned char *out, size_t *outlen,
|
|
size_t outsize, const unsigned char *in,
|
|
size_t inlen);
|
|
|
|
/* Decryption */
|
|
int OSSL_FUNC_asym_cipher_decrypt_init(void *ctx, void *provkey,
|
|
const OSSL_PARAM params[]);
|
|
int OSSL_FUNC_asym_cipher_decrypt(void *ctx, unsigned char *out, size_t *outlen,
|
|
size_t outsize, const unsigned char *in,
|
|
size_t inlen);
|
|
|
|
/* Asymmetric Cipher parameters */
|
|
int OSSL_FUNC_asym_cipher_get_ctx_params(void *ctx, OSSL_PARAM params[]);
|
|
const OSSL_PARAM *OSSL_FUNC_asym_cipher_gettable_ctx_params(void *provctx);
|
|
int OSSL_FUNC_asym_cipher_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
|
|
const OSSL_PARAM *OSSL_FUNC_asym_cipher_settable_ctx_params(void *provctx);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This documentation is primarily aimed at provider authors. See L<provider(7)>
|
|
for further information.
|
|
|
|
The asymmetric cipher (OSSL_OP_ASYM_CIPHER) operation enables providers to
|
|
implement asymmetric cipher algorithms and make them available to applications
|
|
via the API functions L<EVP_PKEY_encrypt(3)>,
|
|
L<EVP_PKEY_decrypt(3)> and
|
|
other related functions).
|
|
|
|
All "functions" mentioned here are passed as function pointers between
|
|
F<libcrypto> and the provider in L<OSSL_DISPATCH(3)> arrays via
|
|
L<OSSL_ALGORITHM(3)> 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 L<OSSL_DISPATCH(3)> element named
|
|
B<OSSL_FUNC_{name}>.
|
|
For example, the "function" OSSL_FUNC_asym_cipher_newctx() has these:
|
|
|
|
typedef void *(OSSL_FUNC_asym_cipher_newctx_fn)(void *provctx);
|
|
static ossl_inline OSSL_FUNC_asym_cipher_newctx_fn
|
|
OSSL_FUNC_asym_cipher_newctx(const OSSL_DISPATCH *opf);
|
|
|
|
L<OSSL_DISPATCH(3)> arrays are indexed by numbers that are provided as
|
|
macros in L<openssl-core_dispatch.h(7)>, as follows:
|
|
|
|
OSSL_FUNC_asym_cipher_newctx OSSL_FUNC_ASYM_CIPHER_NEWCTX
|
|
OSSL_FUNC_asym_cipher_freectx OSSL_FUNC_ASYM_CIPHER_FREECTX
|
|
OSSL_FUNC_asym_cipher_dupctx OSSL_FUNC_ASYM_CIPHER_DUPCTX
|
|
|
|
OSSL_FUNC_asym_cipher_encrypt_init OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT
|
|
OSSL_FUNC_asym_cipher_encrypt OSSL_FUNC_ASYM_CIPHER_ENCRYPT
|
|
|
|
OSSL_FUNC_asym_cipher_decrypt_init OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT
|
|
OSSL_FUNC_asym_cipher_decrypt OSSL_FUNC_ASYM_CIPHER_DECRYPT
|
|
|
|
OSSL_FUNC_asym_cipher_get_ctx_params OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS
|
|
OSSL_FUNC_asym_cipher_gettable_ctx_params OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS
|
|
OSSL_FUNC_asym_cipher_set_ctx_params OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS
|
|
OSSL_FUNC_asym_cipher_settable_ctx_params OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS
|
|
|
|
An asymmetric cipher algorithm implementation may not implement all of these
|
|
functions.
|
|
In order to be a consistent set of functions a provider must implement
|
|
OSSL_FUNC_asym_cipher_newctx and OSSL_FUNC_asym_cipher_freectx.
|
|
It must also implement both of OSSL_FUNC_asym_cipher_encrypt_init and
|
|
OSSL_FUNC_asym_cipher_encrypt, or both of OSSL_FUNC_asym_cipher_decrypt_init and
|
|
OSSL_FUNC_asym_cipher_decrypt.
|
|
OSSL_FUNC_asym_cipher_get_ctx_params is optional but if it is present then so must
|
|
OSSL_FUNC_asym_cipher_gettable_ctx_params.
|
|
Similarly, OSSL_FUNC_asym_cipher_set_ctx_params is optional but if it is present then
|
|
so must OSSL_FUNC_asym_cipher_settable_ctx_params.
|
|
|
|
An asymmetric cipher algorithm must also implement some mechanism for generating,
|
|
loading or importing keys via the key management (OSSL_OP_KEYMGMT) operation.
|
|
See L<provider-keymgmt(7)> for further details.
|
|
|
|
=head2 Context Management Functions
|
|
|
|
OSSL_FUNC_asym_cipher_newctx() should create and return a pointer to a provider side
|
|
structure for holding context information during an asymmetric cipher operation.
|
|
A pointer to this context will be passed back in a number of the other
|
|
asymmetric cipher operation function calls.
|
|
The parameter I<provctx> is the provider context generated during provider
|
|
initialisation (see L<provider(7)>).
|
|
|
|
OSSL_FUNC_asym_cipher_freectx() is passed a pointer to the provider side asymmetric
|
|
cipher context in the I<ctx> parameter.
|
|
This function should free any resources associated with that context.
|
|
|
|
OSSL_FUNC_asym_cipher_dupctx() should duplicate the provider side asymmetric cipher
|
|
context in the I<ctx> parameter and return the duplicate copy.
|
|
|
|
=head2 Encryption Functions
|
|
|
|
OSSL_FUNC_asym_cipher_encrypt_init() initialises a context for an asymmetric encryption
|
|
given a provider side asymmetric cipher context in the I<ctx> parameter, and a
|
|
pointer to a provider key object in the I<provkey> parameter.
|
|
The I<params>, if not NULL, should be set on the context in a manner similar to
|
|
using OSSL_FUNC_asym_cipher_set_ctx_params().
|
|
The key object should have been previously generated, loaded or imported into
|
|
the provider using the key management (OSSL_OP_KEYMGMT) operation (see L<provider-keymgmt(7)>).
|
|
OSSL_FUNC_asym_cipher_encrypt() performs the actual encryption itself.
|
|
A previously initialised asymmetric cipher context is passed in the I<ctx>
|
|
parameter.
|
|
The data to be encrypted is pointed to by the I<in> parameter which is I<inlen>
|
|
bytes long.
|
|
Unless I<out> is NULL, the encrypted data should be written to the location
|
|
pointed to by the I<out> parameter and it should not exceed I<outsize> bytes in
|
|
length.
|
|
The length of the encrypted data should be written to I<*outlen>.
|
|
If I<out> is NULL then the maximum length of the encrypted data should be
|
|
written to I<*outlen>.
|
|
|
|
=head2 Decryption Functions
|
|
|
|
OSSL_FUNC_asym_cipher_decrypt_init() initialises a context for an asymmetric decryption
|
|
given a provider side asymmetric cipher context in the I<ctx> parameter, and a
|
|
pointer to a provider key object in the I<provkey> parameter.
|
|
The I<params>, if not NULL, should be set on the context in a manner similar to
|
|
using OSSL_FUNC_asym_cipher_set_ctx_params().
|
|
The key object should have been previously generated, loaded or imported into
|
|
the provider using the key management (OSSL_OP_KEYMGMT) operation (see
|
|
L<provider-keymgmt(7)>).
|
|
|
|
OSSL_FUNC_asym_cipher_decrypt() performs the actual decryption itself.
|
|
A previously initialised asymmetric cipher context is passed in the I<ctx>
|
|
parameter.
|
|
The data to be decrypted is pointed to by the I<in> parameter which is I<inlen>
|
|
bytes long.
|
|
Unless I<out> is NULL, the decrypted data should be written to the location
|
|
pointed to by the I<out> parameter and it should not exceed I<outsize> bytes in
|
|
length.
|
|
The length of the decrypted data should be written to I<*outlen>.
|
|
If I<out> is NULL then the maximum length of the decrypted data should be
|
|
written to I<*outlen>.
|
|
|
|
=head2 Asymmetric Cipher Parameters
|
|
|
|
See L<OSSL_PARAM(3)> for further details on the parameters structure used by
|
|
the OSSL_FUNC_asym_cipher_get_ctx_params() and OSSL_FUNC_asym_cipher_set_ctx_params()
|
|
functions.
|
|
|
|
OSSL_FUNC_asym_cipher_get_ctx_params() gets asymmetric cipher parameters associated
|
|
with the given provider side asymmetric cipher context I<ctx> and stores them in
|
|
I<params>.
|
|
Passing NULL for I<params> should return true.
|
|
|
|
OSSL_FUNC_asym_cipher_set_ctx_params() sets the asymmetric cipher parameters associated
|
|
with the given provider side asymmetric cipher context I<ctx> to I<params>.
|
|
Any parameter settings are additional to any that were previously set.
|
|
Passing NULL for I<params> should return true.
|
|
|
|
Parameters currently recognised by built-in asymmetric cipher algorithms are as
|
|
follows.
|
|
Not all parameters are relevant to, or are understood by all asymmetric cipher
|
|
algorithms:
|
|
|
|
=over 4
|
|
|
|
=item "pad-mode" (B<OSSL_ASYM_CIPHER_PARAM_PAD_MODE>) <UTF8 string> OR <integer>
|
|
|
|
The type of padding to be used. The interpretation of this value will depend
|
|
on the algorithm in use.
|
|
|
|
=item "digest" (B<OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST>) <UTF8 string>
|
|
|
|
Gets or sets the name of the OAEP digest algorithm used when OAEP padding is in
|
|
use.
|
|
|
|
=item "digest" (B<OSSL_ASYM_CIPHER_PARAM_DIGEST>) <UTF8 string>
|
|
|
|
Gets or sets the name of the digest algorithm used by the algorithm (where
|
|
applicable).
|
|
|
|
=item "digest-props" (B<OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS>) <UTF8 string>
|
|
|
|
Gets or sets the properties to use when fetching the OAEP digest algorithm.
|
|
|
|
=item "digest-props" (B<OSSL_ASYM_CIPHER_PARAM_DIGEST_PROPS>) <UTF8 string>
|
|
|
|
Gets or sets the properties to use when fetching the cipher digest algorithm.
|
|
|
|
=item "mgf1-digest" (B<OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST>) <UTF8 string>
|
|
|
|
Gets or sets the name of the MGF1 digest algorithm used when OAEP or PSS padding
|
|
is in use.
|
|
|
|
=item "mgf1-digest-props" (B<OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS>) <UTF8 string>
|
|
|
|
Gets or sets the properties to use when fetching the MGF1 digest algorithm.
|
|
|
|
=item "oaep-label" (B<OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL>) <octet string ptr>
|
|
|
|
Gets the OAEP label used when OAEP padding is in use.
|
|
|
|
=item "oaep-label" (B<OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL>) <octet string>
|
|
|
|
Sets the OAEP label used when OAEP padding is in use.
|
|
|
|
=item "tls-client-version" (B<OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION>) <unsigned integer>
|
|
|
|
The TLS protocol version first requested by the client.
|
|
|
|
=item "tls-negotiated-version" (B<OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION>) <unsigned integer>
|
|
|
|
The negotiated TLS protocol version.
|
|
|
|
=back
|
|
|
|
OSSL_FUNC_asym_cipher_gettable_ctx_params() and OSSL_FUNC_asym_cipher_settable_ctx_params()
|
|
get a constant L<OSSL_PARAM(3)> array that describes the gettable and settable
|
|
parameters, i.e. parameters that can be used with OSSL_FUNC_asym_cipherget_ctx_params()
|
|
and OSSL_FUNC_asym_cipher_set_ctx_params() respectively.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
OSSL_FUNC_asym_cipher_newctx() and OSSL_FUNC_asym_cipher_dupctx() should return the newly
|
|
created provider side asymmetric cipher context, or NULL on failure.
|
|
|
|
All other functions should return 1 for success or 0 on error.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<provider(7)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The provider ASYM_CIPHER interface was introduced in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2019-2023 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
|