mirror of
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886ad0045b
The core_thread_start upcall previously had a placeholder in the docs. Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/13660)
704 lines
26 KiB
Plaintext
704 lines
26 KiB
Plaintext
=pod
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=head1 NAME
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provider-base
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- The basic OpenSSL library E<lt>-E<gt> provider functions
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=head1 SYNOPSIS
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#include <openssl/core_dispatch.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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/* Functions offered by libcrypto to the providers */
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const OSSL_ITEM *core_gettable_params(const OSSL_CORE_HANDLE *handle);
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int core_get_params(const OSSL_CORE_HANDLE *handle, OSSL_PARAM params[]);
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typedef void (*OSSL_thread_stop_handler_fn)(void *arg);
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int core_thread_start(const OSSL_CORE_HANDLE *handle,
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OSSL_thread_stop_handler_fn handfn);
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OPENSSL_CORE_CTX *core_get_libctx(const OSSL_CORE_HANDLE *handle);
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void core_new_error(const OSSL_CORE_HANDLE *handle);
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void core_set_error_debug(const OSSL_CORE_HANDLE *handle,
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const char *file, int line, const char *func);
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void core_vset_error(const OSSL_CORE_HANDLE *handle,
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uint32_t reason, const char *fmt, va_list args);
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/*
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* Some OpenSSL functionality is directly offered to providers via
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* dispatch
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*/
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void *CRYPTO_malloc(size_t num, const char *file, int line);
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void *CRYPTO_zalloc(size_t num, const char *file, int line);
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void *CRYPTO_memdup(const void *str, size_t siz,
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const char *file, int line);
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char *CRYPTO_strdup(const char *str, const char *file, int line);
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char *CRYPTO_strndup(const char *str, size_t s,
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const char *file, int line);
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void CRYPTO_free(void *ptr, const char *file, int line);
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void CRYPTO_clear_free(void *ptr, size_t num,
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const char *file, int line);
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void *CRYPTO_realloc(void *addr, size_t num,
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const char *file, int line);
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void *CRYPTO_clear_realloc(void *addr, size_t old_num, size_t num,
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const char *file, int line);
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void *CRYPTO_secure_malloc(size_t num, const char *file, int line);
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void *CRYPTO_secure_zalloc(size_t num, const char *file, int line);
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void CRYPTO_secure_free(void *ptr, const char *file, int line);
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void CRYPTO_secure_clear_free(void *ptr, size_t num,
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const char *file, int line);
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int CRYPTO_secure_allocated(const void *ptr);
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void OPENSSL_cleanse(void *ptr, size_t len);
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OSSL_CORE_BIO * BIO_new_file(const char *filename, const char *mode)
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OSSL_CORE_BIO * BIO_new_membuf(const void *buf, int len)
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int BIO_read_ex(OSSL_CORE_BIO *bio, void *data, size_t data_len,
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size_t *bytes_read))
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int BIO_write_ex(OSSL_CORE_BIO *bio, const void *data, size_t data_len,
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size_t *written)
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int BIO_free(OSSL_CORE_BIO *bio))
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int BIO_vprintf(OSSL_CORE_BIO *bio, const char *format, va_list args)
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int BIO_vsnprintf(char *buf, size_t n, const char *fmt, va_list args)
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void self_test_cb(OPENSSL_CORE_CTX *ctx, OSSL_CALLBACK **cb, void **cbarg)
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size_t get_entropy(const OSSL_CORE_HANDLE *handle,
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unsigned char **pout, int entropy,
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size_t min_len, size_t max_len)
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void cleanup_entropy(const OSSL_CORE_HANDLE *handle,
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unsigned char *buf, size_t len)
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size_t get_nonce(const OSSL_CORE_HANDLE *handle,
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unsigned char **pout, size_t min_len, size_t max_len,
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const void *salt, size_t salt_len)
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void cleanup_nonce(const OSSL_CORE_HANDLE *handle,
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unsigned char *buf, size_t len)
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/* Functions offered by the provider to libcrypto */
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void provider_teardown(void *provctx);
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const OSSL_ITEM *provider_gettable_params(void *provctx);
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int provider_get_params(void *provctx, OSSL_PARAM params[]);
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const OSSL_ALGORITHM *provider_query_operation(void *provctx,
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int operation_id,
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const int *no_store);
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const OSSL_ITEM *provider_get_reason_strings(void *provctx);
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int provider_get_capabilities(void *provctx, const char *capability,
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OSSL_CALLBACK *cb, void *arg);
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=head1 DESCRIPTION
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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, in the call
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of the provider initialization function. See L<provider(7)/Provider>
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for a description of the initialization function.
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All these "functions" have a corresponding function type definition
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named B<OSSL_{name}_fn>, and a helper function to retrieve the
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function pointer from a B<OSSL_DISPATCH> element named
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B<OSSL_FUNC_{name}>.
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For example, the "function" core_gettable_params() has these:
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typedef OSSL_PARAM *
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(OSSL_FUNC_core_gettable_params_fn)(const OSSL_CORE_HANDLE *handle);
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static ossl_inline OSSL_NAME_core_gettable_params_fn
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OSSL_FUNC_core_gettable_params(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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For I<in> (the B<OSSL_DISPATCH> array passed from F<libcrypto> to the
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provider):
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core_gettable_params OSSL_FUNC_CORE_GETTABLE_PARAMS
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core_get_params OSSL_FUNC_CORE_GET_PARAMS
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core_thread_start OSSL_FUNC_CORE_THREAD_START
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core_get_libctx OSSL_FUNC_CORE_GET_LIBCTX
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core_new_error OSSL_FUNC_CORE_NEW_ERROR
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core_set_error_debug OSSL_FUNC_CORE_SET_ERROR_DEBUG
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core_set_error OSSL_FUNC_CORE_SET_ERROR
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CRYPTO_malloc OSSL_FUNC_CRYPTO_MALLOC
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CRYPTO_zalloc OSSL_FUNC_CRYPTO_ZALLOC
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CRYPTO_memdup OSSL_FUNC_CRYPTO_MEMDUP
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CRYPTO_strdup OSSL_FUNC_CRYPTO_STRDUP
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CRYPTO_strndup OSSL_FUNC_CRYPTO_STRNDUP
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CRYPTO_free OSSL_FUNC_CRYPTO_FREE
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CRYPTO_clear_free OSSL_FUNC_CRYPTO_CLEAR_FREE
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CRYPTO_realloc OSSL_FUNC_CRYPTO_REALLOC
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CRYPTO_clear_realloc OSSL_FUNC_CRYPTO_CLEAR_REALLOC
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CRYPTO_secure_malloc OSSL_FUNC_CRYPTO_SECURE_MALLOC
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CRYPTO_secure_zalloc OSSL_FUNC_CRYPTO_SECURE_ZALLOC
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CRYPTO_secure_free OSSL_FUNC_CRYPTO_SECURE_FREE
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CRYPTO_secure_clear_free OSSL_FUNC_CRYPTO_SECURE_CLEAR_FREE
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CRYPTO_secure_allocated OSSL_FUNC_CRYPTO_SECURE_ALLOCATED
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BIO_new_file OSSL_FUNC_BIO_NEW_FILE
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BIO_new_mem_buf OSSL_FUNC_BIO_NEW_MEMBUF
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BIO_read_ex OSSL_FUNC_BIO_READ_EX
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BIO_free OSSL_FUNC_BIO_FREE
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BIO_vprintf OSSL_FUNC_BIO_VPRINTF
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OPENSSL_cleanse OSSL_FUNC_OPENSSL_CLEANSE
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OSSL_SELF_TEST_set_callback OSSL_FUNC_SELF_TEST_CB
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ossl_rand_get_entropy OSSL_FUNC_GET_ENTROPY
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ossl_rand_cleanup_entropy OSSL_FUNC_CLEANUP_ENTROPY
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ossl_rand_get_nonce OSSL_FUNC_GET_NONCE
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ossl_rand_cleanup_nonce OSSL_FUNC_CLEANUP_NONCE
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For I<*out> (the B<OSSL_DISPATCH> array passed from the provider to
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F<libcrypto>):
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provider_teardown OSSL_FUNC_PROVIDER_TEARDOWN
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provider_gettable_params OSSL_FUNC_PROVIDER_GETTABLE_PARAMS
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provider_get_params OSSL_FUNC_PROVIDER_GET_PARAMS
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provider_query_operation OSSL_FUNC_PROVIDER_QUERY_OPERATION
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provider_get_reason_strings OSSL_FUNC_PROVIDER_GET_REASON_STRINGS
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provider_get_capabilities OSSL_FUNC_PROVIDER_GET_CAPABILITIES
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provider_self_test OSSL_FUNC_PROVIDER_SELF_TEST
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=head2 Core functions
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core_gettable_params() returns a constant array of descriptor
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B<OSSL_PARAM>, for parameters that core_get_params() can handle.
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core_get_params() retrieves parameters from the core for the given I<handle>.
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See L</Core parameters> below for a description of currently known
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parameters.
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The core_thread_start() function informs the core that the provider has started
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an interest in the current thread. The core will inform the provider when the
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thread eventually stops. It must be passed the I<handle> for this provider, as
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well as a callback I<handfn> which will be called when the thread stops. The
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callback will subsequently be called from the thread that is stopping and gets
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passed the provider context as an argument. This may be useful to perform thread
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specific clean up such as freeing thread local variables.
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core_get_libctx() retrieves the library context in which the library
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object for the current provider is stored, accessible through the I<handle>.
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This may sometimes be useful if the provider wishes to store a
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reference to its context in the same library context.
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core_new_error(), core_set_error_debug() and core_set_error() are
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building blocks for reporting an error back to the core, with
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reference to the I<handle>.
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=over 4
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=item core_new_error()
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allocates a new thread specific error record.
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This corresponds to the OpenSSL function L<ERR_new(3)>.
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=item core_set_error_debug()
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sets debugging information in the current thread specific error
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record.
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The debugging information includes the name of the file I<file>, the
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line I<line> and the function name I<func> where the error occurred.
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This corresponds to the OpenSSL function L<ERR_set_debug(3)>.
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=item core_set_error()
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sets the I<reason> for the error, along with any addition data.
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The I<reason> is a number defined by the provider and used to index
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the reason strings table that's returned by
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provider_get_reason_strings().
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The additional data is given as a format string I<fmt> and a set of
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arguments I<args>, which are treated in the same manner as with
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BIO_vsnprintf().
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I<file> and I<line> may also be passed to indicate exactly where the
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error occurred or was reported.
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This corresponds to the OpenSSL function L<ERR_vset_error(3)>.
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=back
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CRYPTO_malloc(), CRYPTO_zalloc(), CRYPTO_memdup(), CRYPTO_strdup(),
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CRYPTO_strndup(), CRYPTO_free(), CRYPTO_clear_free(),
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CRYPTO_realloc(), CRYPTO_clear_realloc(), CRYPTO_secure_malloc(),
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CRYPTO_secure_zalloc(), CRYPTO_secure_free(),
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CRYPTO_secure_clear_free(), CRYPTO_secure_allocated(),
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BIO_new_file(), BIO_new_mem_buf(), BIO_read_ex(), BIO_free(),
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BIO_vprintf(), OPENSSL_cleanse(), and OPENSSL_hexstr2buf()
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correspond exactly to the public functions with the same name.
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As a matter of fact, the pointers in the B<OSSL_DISPATCH> array are
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direct pointers to those public functions. Note that the BIO functions take an
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B<OSSL_CORE_BIO> type rather than the standard B<BIO> type. This is to ensure
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that a provider does not mix BIOs from the core with BIOs used on the provider
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side (the two are not compatible).
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OSSL_SELF_TEST_set_callback() is used to set an optional callback that can be
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passed into a provider. This may be ignored by a provider.
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get_entropy() retrieves seeding material from the operating system.
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The seeding material will have at least I<entropy> bytes of randomness and the
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output will have at least I<min_len> and at most I<max_len> bytes.
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The buffer address is stored in I<*pout> and the buffer length is
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returned to the caller. On error, zero is returned.
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cleanup_entropy() is used to clean up and free the buffer returned by
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get_entropy(). The entropy pointer returned by get_entropy() is passed in
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B<buf> and its length in B<len>.
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get_nonce() retrieves a nonce using the passed I<salt> parameter
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of length I<salt_len> and operating system specific information.
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The I<salt> should contain uniquely identifying information and this is
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included, in an unspecified manner, as part of the output.
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The output is stored in a buffer which contrains at least I<min_len> and at
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most I<max_len> bytes. The buffer address is stored in I<*pout> and the
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buffer length returned to the caller. On error, zero is returned.
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cleanup_nonce() is used to clean up and free the buffer returned by
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get_nonce(). The nonce pointer returned by get_nonce() is passed in
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B<buf> and its length in B<len>.
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=head2 Provider functions
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provider_teardown() is called when a provider is shut down and removed
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from the core's provider store.
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It must free the passed I<provctx>.
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provider_gettable_params() should return a constant array of
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descriptor B<OSSL_PARAM>, for parameters that provider_get_params()
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can handle.
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provider_get_params() should process the B<OSSL_PARAM> array
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I<params>, setting the values of the parameters it understands.
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provider_query_operation() should return a constant B<OSSL_ALGORITHM>
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that corresponds to the given I<operation_id>.
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It should indicate if the core may store a reference to this array by
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setting I<*no_store> to 0 (core may store a reference) or 1 (core may
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not store a reference).
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provider_get_reason_strings() should return a constant B<OSSL_ITEM>
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array that provides reason strings for reason codes the provider may
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use when reporting errors using core_put_error().
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The provider_get_capabilities() function should call the callback I<cb> passing
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it a set of B<OSSL_PARAM>s and the caller supplied argument I<arg>. The
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B<OSSL_PARAM>s should provide details about the capability with the name given
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in the I<capability> argument relevant for the provider context I<provctx>. If a
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provider supports multiple capabilities with the given name then it may call the
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callback multiple times (one for each capability). Capabilities can be useful for
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describing the services that a provider can offer. For further details see the
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L</CAPABILITIES> section below. It should return 1 on success or 0 on error.
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The provider_self_test() function should perform known answer tests on a subset
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of the algorithms that it uses, and may also verify the integrity of the
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provider module. It should return 1 on success or 0 on error. It will return 1
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if this function is not used.
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None of these functions are mandatory, but a provider is fairly
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useless without at least provider_query_operation(), and
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provider_gettable_params() is fairly useless if not accompanied by
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provider_get_params().
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=head2 Provider parameters
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provider_get_params() can return the following provider parameters to the core:
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=over 4
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=item "name" (B<OSSL_PROV_PARAM_NAME>) <UTF8_ptr>
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This points to a string that should give a unique name for the provider.
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=item "version" (B<OSSL_PROV_PARAM_VERSION>) <UTF8_ptr>
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This points to a string that is a version number associated with this provider.
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OpenSSL in-built providers use OPENSSL_VERSION_STR, but this may be different
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for any third party provider. This string is for informational purposes only.
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=item "buildinfo" (B<OSSL_PROV_PARAM_BUILDINFO>) <UTF8_ptr>
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This points to a string that is a build information associated with this provider.
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OpenSSL in-built providers use OPENSSL_FULL_VERSION_STR, but this may be
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different for any third party provider.
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=item "status" (B<OSSL_PROV_PARAM_STATUS>) <unsigned integer>
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This returns 0 if the provider has entered an error state, otherwise it returns
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1.
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=back
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provider_gettable_params() should return the above parameters.
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=head2 Core parameters
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core_get_params() can retrieve the following core parameters for each provider:
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=over 4
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=item "openssl-version" (B<OSSL_PROV_PARAM_CORE_VERSION>) <UTF8_ptr>
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This points to the OpenSSL libraries' full version string, i.e. the string
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expanded from the macro B<OPENSSL_VERSION_STR>.
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=item "provider-name" (B<OSSL_PROV_PARAM_CORE_PROV_NAME>) <UTF8_ptr>
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This points to the OpenSSL libraries' idea of what the calling provider is named.
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=item "module-filename" (B<OSSL_PROV_PARAM_CORE_MODULE_FILENAME>) <UTF8_ptr>
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This points to a string containing the full filename of the providers
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module file.
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=back
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Additionally, provider specific configuration parameters from the
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config file are available, in dotted name form.
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The dotted name form is a concatenation of section names and final
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config command name separated by periods.
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For example, let's say we have the following config example:
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openssl_conf = openssl_init
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[openssl_init]
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providers = providers_sect
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[providers_sect]
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foo = foo_sect
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[foo_sect]
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activate = 1
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data1 = 2
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data2 = str
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more = foo_more
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[foo_more]
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data3 = foo,bar
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The provider will have these additional parameters available:
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=over 4
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=item "activate"
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pointing at the string "1"
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=item "data1"
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pointing at the string "2"
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=item "data2"
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pointing at the string "str"
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=item "more.data3"
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pointing at the string "foo,bar"
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=back
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For more information on handling parameters, see L<OSSL_PARAM(3)> as
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L<OSSL_PARAM_int(3)>.
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=head1 CAPABILITIES
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Capabilities describe some of the services that a provider can offer.
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Applications can query the capabilities to discover those services.
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=head3 "TLS-GROUP" Capability
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The "TLS-GROUP" capability can be queried by libssl to discover the list of
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TLS groups that a provider can support. Each group supported can be used for
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I<key exchange> (KEX) or I<key encapsulation method> (KEM) during a TLS
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handshake.
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TLS clients can advertise the list of TLS groups they support in the
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supported_groups extension, and TLS servers can select a group from the offered
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list that they also support. In this way a provider can add to the list of
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groups that libssl already supports with additional ones.
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Each TLS group that a provider supports should be described via the callback
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passed in through the provider_get_capabilities function. Each group should have
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the following details supplied (all are mandatory, except
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B<OSSL_CAPABILITY_TLS_GROUP_IS_KEM>):
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=over 4
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=item "tls-group-name" (B<OSSL_CAPABILITY_TLS_GROUP_NAME>) <utf8 string>
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The name of the group as given in the IANA TLS Supported Groups registry
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L<https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-8>.
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=item "tls-group-name-internal" (B<OSSL_CAPABILITY_TLS_GROUP_NAME_INTERNAL>) <utf8 string>
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The name of the group as known by the provider. This could be the same as the
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"tls-group-name", but does not have to be.
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=item "tls-group-id" (B<OSSL_CAPABILITY_TLS_GROUP_ID>) <unsigned integer>
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The TLS group id value as given in the IANA TLS Supported Groups registry.
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=item "tls-group-alg" (B<OSSL_CAPABILITY_TLS_GROUP_ALG>) <utf8 string>
|
|
|
|
The name of a Key Management algorithm that the provider offers and that should
|
|
be used with this group. Keys created should be able to support I<key exchange>
|
|
or I<key encapsulation method> (KEM), as implied by the optional
|
|
B<OSSL_CAPABILITY_TLS_GROUP_IS_KEM> flag.
|
|
The algorithm must support key and parameter generation as well as the
|
|
key/parameter generation parameter, B<OSSL_PKEY_PARAM_GROUP_NAME>. The group
|
|
name given via "tls-group-name-internal" above will be passed via
|
|
B<OSSL_PKEY_PARAM_GROUP_NAME> when libssl wishes to generate keys/parameters.
|
|
|
|
=item "tls-group-sec-bits" (B<OSSL_CAPABILITY_TLS_GROUP_SECURITY_BITS>) <unsigned integer>
|
|
|
|
The number of bits of security offered by keys in this group. The number of bits
|
|
should be comparable with the ones given in table 2 and 3 of the NIST SP800-57
|
|
document.
|
|
|
|
=item "tls-group-is-kem" (B<OSSL_CAPABILITY_TLS_GROUP_IS_KEM>) <unsigned integer>
|
|
|
|
Boolean flag to describe if the group should be used in I<key exchange> (KEX)
|
|
mode (0, default) or in I<key encapsulation method> (KEM) mode (1).
|
|
|
|
This parameter is optional: if not specified, KEX mode is assumed as the default
|
|
mode for the group.
|
|
|
|
In KEX mode, in a typical Diffie-Hellman fashion, both sides execute I<keygen>
|
|
then I<derive> against the peer public key. To operate in KEX mode, the group
|
|
implementation must support the provider functions as described in
|
|
L<provider-keyexch(7)>.
|
|
|
|
In KEM mode, the client executes I<keygen> and sends its public key, the server
|
|
executes I<encapsulate> using the client's public key and sends back the
|
|
resulting I<ciphertext>, finally the client executes I<decapsulate> to retrieve
|
|
the same I<shared secret> generated by the server's I<encapsulate>. To operate
|
|
in KEM mode, the group implementation must support the provider functions as
|
|
described in L<provider-kem(7)>.
|
|
|
|
Both in KEX and KEM mode, the resulting I<shared secret> is then used according
|
|
to the protocol specification.
|
|
|
|
=item "tls-min-tls" (B<OSSL_CAPABILITY_TLS_GROUP_MIN_TLS>) <integer>
|
|
|
|
=item "tls-max-tls" (B<OSSL_CAPABILITY_TLS_GROUP_MAX_TLS>) <integer>
|
|
|
|
=item "tls-min-dtls" (B<OSSL_CAPABILITY_TLS_GROUP_MIN_DTLS>) <integer>
|
|
|
|
=item "tls-max-dtls" (B<OSSL_CAPABILITY_TLS_GROUP_MAX_DTLS>) <integer>
|
|
|
|
These parameters can be used to describe the minimum and maximum TLS and DTLS
|
|
versions supported by the group. The values equate to the on-the-wire encoding
|
|
of the various TLS versions. For example TLSv1.3 is 0x0304 (772 decimal), and
|
|
TLSv1.2 is 0x0303 (771 decimal). A 0 indicates that there is no defined minimum
|
|
or maximum. A -1 indicates that the group should not be used in that protocol.
|
|
|
|
=back
|
|
|
|
=head1 EXAMPLES
|
|
|
|
This is an example of a simple provider made available as a
|
|
dynamically loadable module.
|
|
It implements the fictitious algorithm C<FOO> for the fictitious
|
|
operation C<BAR>.
|
|
|
|
#include <malloc.h>
|
|
#include <openssl/core.h>
|
|
#include <openssl/core_dispatch.h>
|
|
|
|
/* Errors used in this provider */
|
|
#define E_MALLOC 1
|
|
|
|
static const OSSL_ITEM reasons[] = {
|
|
{ E_MALLOC, "memory allocation failure" }.
|
|
{ 0, NULL } /* Termination */
|
|
};
|
|
|
|
/*
|
|
* To ensure we get the function signature right, forward declare
|
|
* them using function types provided by openssl/core_dispatch.h
|
|
*/
|
|
OSSL_FUNC_bar_newctx_fn foo_newctx;
|
|
OSSL_FUNC_bar_freectx_fn foo_freectx;
|
|
OSSL_FUNC_bar_init_fn foo_init;
|
|
OSSL_FUNC_bar_update_fn foo_update;
|
|
OSSL_FUNC_bar_final_fn foo_final;
|
|
|
|
OSSL_FUNC_provider_query_operation_fn p_query;
|
|
OSSL_FUNC_provider_get_reason_strings_fn p_reasons;
|
|
OSSL_FUNC_provider_teardown_fn p_teardown;
|
|
|
|
OSSL_provider_init_fn OSSL_provider_init;
|
|
|
|
OSSL_FUNC_core_put_error *c_put_error = NULL;
|
|
|
|
/* Provider context */
|
|
struct prov_ctx_st {
|
|
OSSL_CORE_HANDLE *handle;
|
|
}
|
|
|
|
/* operation context for the algorithm FOO */
|
|
struct foo_ctx_st {
|
|
struct prov_ctx_st *provctx;
|
|
int b;
|
|
};
|
|
|
|
static void *foo_newctx(void *provctx)
|
|
{
|
|
struct foo_ctx_st *fooctx = malloc(sizeof(*fooctx));
|
|
|
|
if (fooctx != NULL)
|
|
fooctx->provctx = provctx;
|
|
else
|
|
c_put_error(provctx->handle, E_MALLOC, __FILE__, __LINE__);
|
|
return fooctx;
|
|
}
|
|
|
|
static void foo_freectx(void *fooctx)
|
|
{
|
|
free(fooctx);
|
|
}
|
|
|
|
static int foo_init(void *vfooctx)
|
|
{
|
|
struct foo_ctx_st *fooctx = vfooctx;
|
|
|
|
fooctx->b = 0x33;
|
|
}
|
|
|
|
static int foo_update(void *vfooctx, unsigned char *in, size_t inl)
|
|
{
|
|
struct foo_ctx_st *fooctx = vfooctx;
|
|
|
|
/* did you expect something serious? */
|
|
if (inl == 0)
|
|
return 1;
|
|
for (; inl-- > 0; in++)
|
|
*in ^= fooctx->b;
|
|
return 1;
|
|
}
|
|
|
|
static int foo_final(void *vfooctx)
|
|
{
|
|
struct foo_ctx_st *fooctx = vfooctx;
|
|
|
|
fooctx->b = 0x66;
|
|
}
|
|
|
|
static const OSSL_DISPATCH foo_fns[] = {
|
|
{ OSSL_FUNC_BAR_NEWCTX, (void (*)(void))foo_newctx },
|
|
{ OSSL_FUNC_BAR_FREECTX, (void (*)(void))foo_freectx },
|
|
{ OSSL_FUNC_BAR_INIT, (void (*)(void))foo_init },
|
|
{ OSSL_FUNC_BAR_UPDATE, (void (*)(void))foo_update },
|
|
{ OSSL_FUNC_BAR_FINAL, (void (*)(void))foo_final },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const OSSL_ALGORITHM bars[] = {
|
|
{ "FOO", "provider=chumbawamba", foo_fns },
|
|
{ NULL, NULL, NULL }
|
|
};
|
|
|
|
static const OSSL_ALGORITHM *p_query(void *provctx, int operation_id,
|
|
int *no_store)
|
|
{
|
|
switch (operation_id) {
|
|
case OSSL_OP_BAR:
|
|
return bars;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const OSSL_ITEM *p_reasons(void *provctx)
|
|
{
|
|
return reasons;
|
|
}
|
|
|
|
static void p_teardown(void *provctx)
|
|
{
|
|
free(provctx);
|
|
}
|
|
|
|
static const OSSL_DISPATCH prov_fns[] = {
|
|
{ OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))p_teardown },
|
|
{ OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))p_query },
|
|
{ OSSL_FUNC_PROVIDER_GET_REASON_STRINGS, (void (*)(void))p_reasons },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
int OSSL_provider_init(const OSSL_CORE_HANDLE *handle,
|
|
const OSSL_DISPATCH *in,
|
|
const OSSL_DISPATCH **out,
|
|
void **provctx)
|
|
{
|
|
struct prov_ctx_st *pctx = NULL;
|
|
|
|
for (; in->function_id != 0; in++)
|
|
switch (in->function_id) {
|
|
case OSSL_FUNC_CORE_PUT_ERROR:
|
|
c_put_error = OSSL_FUNC_core_put_error(in);
|
|
break;
|
|
}
|
|
|
|
*out = prov_fns;
|
|
|
|
if ((pctx = malloc(sizeof(*pctx))) == NULL) {
|
|
/*
|
|
* ALEA IACTA EST, if the core retrieves the reason table
|
|
* regardless, that string will be displayed, otherwise not.
|
|
*/
|
|
c_put_error(handle, E_MALLOC, __FILE__, __LINE__);
|
|
return 0;
|
|
}
|
|
pctx->handle = handle;
|
|
return 1;
|
|
}
|
|
|
|
This relies on a few things existing in F<openssl/core_dispatch.h>:
|
|
|
|
#define OSSL_OP_BAR 4711
|
|
|
|
#define OSSL_FUNC_BAR_NEWCTX 1
|
|
typedef void *(OSSL_FUNC_bar_newctx_fn)(void *provctx);
|
|
static ossl_inline OSSL_FUNC_bar_newctx(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_newctx_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_FREECTX 2
|
|
typedef void (OSSL_FUNC_bar_freectx_fn)(void *ctx);
|
|
static ossl_inline OSSL_FUNC_bar_newctx(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_freectx_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_INIT 3
|
|
typedef void *(OSSL_FUNC_bar_init_fn)(void *ctx);
|
|
static ossl_inline OSSL_FUNC_bar_init(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_init_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_UPDATE 4
|
|
typedef void *(OSSL_FUNC_bar_update_fn)(void *ctx,
|
|
unsigned char *in, size_t inl);
|
|
static ossl_inline OSSL_FUNC_bar_update(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_update_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_FINAL 5
|
|
typedef void *(OSSL_FUNC_bar_final_fn)(void *ctx);
|
|
static ossl_inline OSSL_FUNC_bar_final(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_final_fn *)opf->function; }
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<provider(7)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The concept of providers and everything surrounding them was
|
|
introduced in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2019-2020 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
|