382 lines
17 KiB
Plaintext
382 lines
17 KiB
Plaintext
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.rm #[ #] #H #V #F C
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-CIPHER 7ossl"
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.TH PROVIDER-CIPHER 7ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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provider\-cipher \- The cipher library <\-> provider functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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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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\& /*
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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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\&
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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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\&
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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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\&
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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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\&
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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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\&
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\& /* Cipher parameters */
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\& int OSSL_FUNC_cipher_get_params(OSSL_PARAM params[]);
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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This documentation is primarily aimed at provider authors. See \fIprovider\fR\|(7)
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for further information.
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.PP
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The \s-1CIPHER\s0 operation enables providers to implement cipher algorithms and make
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them available to applications via the \s-1API\s0 functions \fIEVP_EncryptInit_ex\fR\|(3),
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\&\fIEVP_EncryptUpdate\fR\|(3) and \fIEVP_EncryptFinal\fR\|(3) (as well as the decrypt
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equivalents and other related functions).
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.PP
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All \*(L"functions\*(R" mentioned here are passed as function pointers between
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\&\fIlibcrypto\fR and the provider in \s-1\fIOSSL_DISPATCH\s0\fR\|(3) arrays via
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\&\s-1\fIOSSL_ALGORITHM\s0\fR\|(3) arrays that are returned by the provider's
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\&\fIprovider_query_operation()\fR function
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(see \*(L"Provider Functions\*(R" in \fIprovider\-base\fR\|(7)).
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.PP
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All these \*(L"functions\*(R" have a corresponding function type definition
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named \fBOSSL_FUNC_{name}_fn\fR, and a helper function to retrieve the
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function pointer from an \s-1\fIOSSL_DISPATCH\s0\fR\|(3) element named
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\&\fBOSSL_FUNC_{name}\fR.
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For example, the \*(L"function\*(R" \fIOSSL_FUNC_cipher_newctx()\fR has these:
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.PP
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.Vb 3
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\& typedef void *(OSSL_FUNC_cipher_newctx_fn)(void *provctx);
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\& static ossl_inline OSSL_FUNC_cipher_newctx_fn
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\& OSSL_FUNC_cipher_newctx(const OSSL_DISPATCH *opf);
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.Ve
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.PP
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\&\s-1\fIOSSL_DISPATCH\s0\fR\|(3) arrays are indexed by numbers that are provided as
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macros in \fIopenssl\-core_dispatch.h\fR\|(7), as follows:
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.PP
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.Vb 3
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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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\&
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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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\&
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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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\&
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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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.Ve
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.PP
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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 \*(L"encrypt\*(R" functions, or a complete set of \*(L"decrypt\*(R" functions, or a
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single \*(L"cipher\*(R" 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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.SS "Context Management Functions"
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.IX Subsection "Context Management Functions"
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\&\fIOSSL_FUNC_cipher_newctx()\fR 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 \fIprovctx\fR is the provider context generated during provider
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initialisation (see \fIprovider\fR\|(7)).
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.PP
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\&\fIOSSL_FUNC_cipher_freectx()\fR is passed a pointer to the provider side cipher context in
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the \fIcctx\fR parameter.
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This function should free any resources associated with that context.
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.PP
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\&\fIOSSL_FUNC_cipher_dupctx()\fR should duplicate the provider side cipher context in the
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\&\fIcctx\fR parameter and return the duplicate copy.
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.SS "Encryption/Decryption Functions"
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.IX Subsection "Encryption/Decryption Functions"
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\&\fIOSSL_FUNC_cipher_encrypt_init()\fR initialises a cipher operation for encryption given a
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newly created provider side cipher context in the \fIcctx\fR parameter.
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The key to be used is given in \fIkey\fR which is \fIkeylen\fR bytes long.
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The \s-1IV\s0 to be used is given in \fIiv\fR which is \fIivlen\fR bytes long.
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The \fIparams\fR, if not \s-1NULL,\s0 should be set on the context in a manner similar to
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using \fIOSSL_FUNC_cipher_set_ctx_params()\fR.
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.PP
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\&\fIOSSL_FUNC_cipher_decrypt_init()\fR is the same as \fIOSSL_FUNC_cipher_encrypt_init()\fR except that it
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initialises the context for a decryption operation.
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.PP
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\&\fIOSSL_FUNC_cipher_update()\fR 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 \fIcctx\fR parameter contains a pointer to a previously initialised provider
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side context.
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\&\fIOSSL_FUNC_cipher_update()\fR should encrypt/decrypt \fIinl\fR bytes of data at the location
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pointed to by \fIin\fR.
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The encrypted data should be stored in \fIout\fR and the amount of data written to
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\&\fI*outl\fR which should not exceed \fIoutsize\fR bytes.
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\&\fIOSSL_FUNC_cipher_update()\fR may be called multiple times for a single cipher operation.
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It is the responsibility of the cipher implementation to handle input lengths
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that are not multiples of the block length.
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In such cases a cipher implementation will typically cache partial blocks of
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input data until a complete block is obtained.
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The pointers \fIout\fR and \fIin\fR may point to the same location, in which
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case the encryption must be done in-place. If \fIout\fR and \fIin\fR point to different
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locations, the requirements of \fIEVP_EncryptUpdate\fR\|(3) and \fIEVP_DecryptUpdate\fR\|(3)
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guarantee that the two buffers are disjoint.
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|
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Similarly, the requirements of \fIEVP_EncryptUpdate\fR\|(3) and \fIEVP_DecryptUpdate\fR\|(3)
|
||
|
|
ensure that the buffer pointed to by \fIout\fR contains sufficient room for the
|
||
|
|
operation being performed.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_final()\fR completes an encryption or decryption started through previous
|
||
|
|
\&\fIOSSL_FUNC_cipher_encrypt_init()\fR or \fIOSSL_FUNC_cipher_decrypt_init()\fR, and \fIOSSL_FUNC_cipher_update()\fR
|
||
|
|
calls.
|
||
|
|
The \fIcctx\fR parameter contains a pointer to the provider side context.
|
||
|
|
Any final encryption/decryption output should be written to \fIout\fR and the
|
||
|
|
amount of data written to \fI*outl\fR which should not exceed \fIoutsize\fR bytes.
|
||
|
|
The same expectations apply to \fIoutsize\fR as documented for
|
||
|
|
\&\fIEVP_EncryptFinal\fR\|(3) and \fIEVP_DecryptFinal\fR\|(3).
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_cipher()\fR performs encryption/decryption using the provider side cipher
|
||
|
|
context in the \fIcctx\fR parameter that should have been previously initialised via
|
||
|
|
a call to \fIOSSL_FUNC_cipher_encrypt_init()\fR or \fIOSSL_FUNC_cipher_decrypt_init()\fR.
|
||
|
|
This should call the raw underlying cipher function without any padding.
|
||
|
|
This will be invoked in the provider as a result of the application calling
|
||
|
|
\&\fIEVP_Cipher\fR\|(3).
|
||
|
|
The application is responsible for ensuring that the input is a multiple of the
|
||
|
|
block length.
|
||
|
|
The data to be encrypted/decrypted will be in \fIin\fR, and it will be \fIinl\fR bytes
|
||
|
|
in length.
|
||
|
|
The output from the encryption/decryption should be stored in \fIout\fR and the
|
||
|
|
amount of data stored should be put in \fI*outl\fR which should be no more than
|
||
|
|
\&\fIoutsize\fR bytes.
|
||
|
|
.SS "Cipher Parameters"
|
||
|
|
.IX Subsection "Cipher Parameters"
|
||
|
|
See \s-1\fIOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
|
||
|
|
these functions.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_get_params()\fR gets details of the algorithm implementation
|
||
|
|
and stores them in \fIparams\fR.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_set_ctx_params()\fR sets cipher operation parameters for the
|
||
|
|
provider side cipher context \fIcctx\fR to \fIparams\fR.
|
||
|
|
Any parameter settings are additional to any that were previously set.
|
||
|
|
Passing \s-1NULL\s0 for \fIparams\fR should return true.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_get_ctx_params()\fR gets cipher operation details details from
|
||
|
|
the given provider side cipher context \fIcctx\fR and stores them in \fIparams\fR.
|
||
|
|
Passing \s-1NULL\s0 for \fIparams\fR should return true.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_gettable_params()\fR, \fIOSSL_FUNC_cipher_gettable_ctx_params()\fR,
|
||
|
|
and \fIOSSL_FUNC_cipher_settable_ctx_params()\fR all return constant \s-1\fIOSSL_PARAM\s0\fR\|(3)
|
||
|
|
arrays as descriptors of the parameters that \fIOSSL_FUNC_cipher_get_params()\fR,
|
||
|
|
\&\fIOSSL_FUNC_cipher_get_ctx_params()\fR, and \fIOSSL_FUNC_cipher_set_ctx_params()\fR
|
||
|
|
can handle, respectively. \fIOSSL_FUNC_cipher_gettable_ctx_params()\fR and
|
||
|
|
\&\fIOSSL_FUNC_cipher_settable_ctx_params()\fR will return the parameters associated
|
||
|
|
with the provider side context \fIcctx\fR in its current state if it is
|
||
|
|
not \s-1NULL. \s0 Otherwise, they return the parameters associated with the
|
||
|
|
provider side algorithm \fIprovctx\fR.
|
||
|
|
.PP
|
||
|
|
Parameters currently recognised by built-in ciphers are listed in
|
||
|
|
\&\*(L"\s-1PARAMETERS\*(R"\s0 in \fIEVP_EncryptInit\fR\|(3).
|
||
|
|
Not all parameters are relevant to, or are understood by all ciphers.
|
||
|
|
.SH "RETURN VALUES"
|
||
|
|
.IX Header "RETURN VALUES"
|
||
|
|
\&\fIOSSL_FUNC_cipher_newctx()\fR and \fIOSSL_FUNC_cipher_dupctx()\fR should return the newly created
|
||
|
|
provider side cipher context, or \s-1NULL\s0 on failure.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_encrypt_init()\fR, \fIOSSL_FUNC_cipher_decrypt_init()\fR, \fIOSSL_FUNC_cipher_update()\fR,
|
||
|
|
\&\fIOSSL_FUNC_cipher_final()\fR, \fIOSSL_FUNC_cipher_cipher()\fR, \fIOSSL_FUNC_cipher_get_params()\fR,
|
||
|
|
\&\fIOSSL_FUNC_cipher_get_ctx_params()\fR and \fIOSSL_FUNC_cipher_set_ctx_params()\fR should return 1 for
|
||
|
|
success or 0 on error.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_cipher_gettable_params()\fR, \fIOSSL_FUNC_cipher_gettable_ctx_params()\fR and
|
||
|
|
\&\fIOSSL_FUNC_cipher_settable_ctx_params()\fR should return a constant \s-1\fIOSSL_PARAM\s0\fR\|(3)
|
||
|
|
array, or \s-1NULL\s0 if none is offered.
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.IX Header "SEE ALSO"
|
||
|
|
\&\fIprovider\fR\|(7), \s-1\fIOSSL_PROVIDER\-FIPS\s0\fR\|(7), \fIOSSL_PROVIDER\-default\fR\|(7),
|
||
|
|
\&\fIOSSL_PROVIDER\-legacy\fR\|(7),
|
||
|
|
\&\s-1\fIEVP_CIPHER\-AES\s0\fR\|(7), \s-1\fIEVP_CIPHER\-ARIA\s0\fR\|(7), \s-1\fIEVP_CIPHER\-BLOWFISH\s0\fR\|(7),
|
||
|
|
\&\s-1\fIEVP_CIPHER\-CAMELLIA\s0\fR\|(7), \s-1\fIEVP_CIPHER\-CAST\s0\fR\|(7), \s-1\fIEVP_CIPHER\-CHACHA\s0\fR\|(7),
|
||
|
|
\&\s-1\fIEVP_CIPHER\-DES\s0\fR\|(7), \s-1\fIEVP_CIPHER\-IDEA\s0\fR\|(7), \s-1\fIEVP_CIPHER\-RC2\s0\fR\|(7),
|
||
|
|
\&\s-1\fIEVP_CIPHER\-RC4\s0\fR\|(7), \s-1\fIEVP_CIPHER\-RC5\s0\fR\|(7), \s-1\fIEVP_CIPHER\-SEED\s0\fR\|(7),
|
||
|
|
\&\s-1\fIEVP_CIPHER\-SM4\s0\fR\|(7), \s-1\fIEVP_CIPHER\-NULL\s0\fR\|(7),
|
||
|
|
\&\fIlife_cycle\-cipher\fR\|(7), \fIEVP_EncryptInit\fR\|(3)
|
||
|
|
.SH "HISTORY"
|
||
|
|
.IX Header "HISTORY"
|
||
|
|
The provider \s-1CIPHER\s0 interface was introduced in OpenSSL 3.0.
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.IX Header "COPYRIGHT"
|
||
|
|
Copyright 2019\-2023 The OpenSSL Project Authors. All Rights Reserved.
|
||
|
|
.PP
|
||
|
|
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
|
||
|
|
this file except in compliance with the License. You can obtain a copy
|
||
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
||
|
|
<https://www.openssl.org/source/license.html>.
|