376 lines
17 KiB
Groff
Executable File
376 lines
17 KiB
Groff
Executable File
.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16)
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-ASYM_CIPHER 7"
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.TH PROVIDER-ASYM_CIPHER 7 "2020-03-02" "3.0.0-dev" "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\-asym_cipher \- The asym_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_numbers.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 *OP_asym_cipher_newctx(void *provctx);
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\& void OP_asym_cipher_freectx(void *ctx);
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\& void *OP_asym_cipher_dupctx(void *ctx);
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\&
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\& /* Encryption */
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\& int OP_asym_cipher_encrypt_init(void *ctx, void *provkey);
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\& int OP_asym_cipher_encrypt(void *ctx, unsigned char *out, size_t *outlen,
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\& size_t outsize, const unsigned char *in,
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\& size_t inlen);
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\&
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\& /* Decryption */
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\& int OP_asym_cipher_decrypt_init(void *ctx, void *provkey);
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\& int OP_asym_cipher_decrypt(void *ctx, unsigned char *out, size_t *outlen,
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\& size_t outsize, const unsigned char *in,
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\& size_t inlen);
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\&
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\& /* Asymmetric Cipher parameters */
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\& int OP_asym_cipher_get_ctx_params(void *ctx, OSSL_PARAM params[]);
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\& const OSSL_PARAM *OP_asym_cipher_gettable_ctx_params(void);
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\& int OP_asym_cipher_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
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\& const OSSL_PARAM *OP_asym_cipher_settable_ctx_params(void);
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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 asymmetric cipher (\s-1OSSL_OP_ASYM_CIPHER\s0) operation enables providers to
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implement asymmetric cipher algorithms and make them available to applications
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via the \s-1API\s0 functions \fIEVP_PKEY_encrypt\fR\|(3),
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\&\fIEVP_PKEY_decrypt\fR\|(3) and
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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 \fB\s-1OSSL_DISPATCH\s0\fR arrays via
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\&\fB\s-1OSSL_ALGORITHM\s0\fR 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_{name}_fn\fR, and a helper function to retrieve the
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function pointer from an \fB\s-1OSSL_DISPATCH\s0\fR element named
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\&\fBOSSL_get_{name}\fR.
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For example, the \*(L"function\*(R" \fIOP_asym_cipher_newctx()\fR has these:
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.PP
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.Vb 3
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\& typedef void *(OSSL_OP_asym_cipher_newctx_fn)(void *provctx);
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\& static ossl_inline OSSL_OP_asym_cipher_newctx_fn
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\& OSSL_get_OP_asym_cipher_newctx(const OSSL_DISPATCH *opf);
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.Ve
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.PP
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\&\fB\s-1OSSL_DISPATCH\s0\fR arrays are indexed by numbers that are provided as
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macros in \fIopenssl\-core_numbers.h\fR\|(7), as follows:
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.PP
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.Vb 3
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\& OP_asym_cipher_newctx OSSL_FUNC_ASYM_CIPHER_NEWCTX
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\& OP_asym_cipher_freectx OSSL_FUNC_ASYM_CIPHER_FREECTX
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\& OP_asym_cipher_dupctx OSSL_FUNC_ASYM_CIPHER_DUPCTX
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\&
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\& OP_asym_cipher_encrypt_init OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT
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\& OP_asym_cipher_encrypt OSSL_FUNC_ASYM_CIPHER_ENCRYPT
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\&
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\& OP_asym_cipher_decrypt_init OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT
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\& OP_asym_cipher_decrypt OSSL_FUNC_ASYM_CIPHER_DECRYPT
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\&
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\& OP_asym_cipher_get_ctx_params OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS
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\& OP_asym_cipher_gettable_ctx_params OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS
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\& OP_asym_cipher_set_ctx_params OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS
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\& OP_asym_cipher_settable_ctx_params OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS
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.Ve
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.PP
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An asymmetric cipher algorithm implementation may not implement all of these
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functions.
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In order to be a consistent set of functions a provider must implement
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OP_asym_cipher_newctx and OP_asym_cipher_freectx.
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It must also implement both of OP_asym_cipher_encrypt_init and
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OP_asym_cipher_encrypt, or both of OP_asym_cipher_decrypt_init and
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OP_asym_cipher_decrypt.
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OP_asym_cipher_get_ctx_params is optional but if it is present then so must
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OP_asym_cipher_gettable_ctx_params.
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Similarly, OP_asym_cipher_set_ctx_params is optional but if it is present then
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so must OP_asym_cipher_settable_ctx_params.
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.PP
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An asymmetric cipher algorithm must also implement some mechanism for generating,
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loading or importing keys via the key management (\s-1OSSL_OP_KEYMGMT\s0) operation.
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See \fIprovider\-keymgmt\fR\|(7) for further details.
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.SS "Context Management Functions"
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.IX Subsection "Context Management Functions"
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\&\fIOP_asym_cipher_newctx()\fR should create and return a pointer to a provider side
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structure for holding context information during an asymmetric cipher operation.
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A pointer to this context will be passed back in a number of the other
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asymmetric cipher 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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\&\fIOP_asym_cipher_freectx()\fR is passed a pointer to the provider side asymmetric
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cipher context in the \fIctx\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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\&\fIOP_asym_cipher_dupctx()\fR should duplicate the provider side asymmetric cipher
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context in the \fIctx\fR parameter and return the duplicate copy.
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.SS "Encryption Functions"
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.IX Subsection "Encryption Functions"
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\&\fIOP_asym_cipher_encrypt_init()\fR initialises a context for an asymmetric encryption
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given a provider side asymmetric cipher context in the \fIctx\fR parameter, and a
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pointer to a provider key object in the \fIprovkey\fR parameter.
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The key object should have been previously generated, loaded or imported into
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the provider using the key management (\s-1OSSL_OP_KEYMGMT\s0) operation (see
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\&\fIprovider\-keymgmt\fR\|(7)>.
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.PP
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\&\fIOP_asym_cipher_encrypt()\fR performs the actual encryption itself.
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A previously initialised asymmetric cipher context is passed in the \fIctx\fR
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parameter.
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The data to be encrypted is pointed to by the \fIin\fR parameter which is \fIinlen\fR
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bytes long.
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Unless \fIout\fR is \s-1NULL\s0, the encrypted data should be written to the location
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pointed to by the \fIout\fR parameter and it should not exceed \fIoutsize\fR bytes in
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length.
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The length of the encrypted data should be written to \fI*outlen\fR.
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If \fIout\fR is \s-1NULL\s0 then the maximum length of the encrypted data should be
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written to \fI*outlen\fR.
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.SS "Decryption Functions"
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.IX Subsection "Decryption Functions"
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\&\fIOP_asym_cipher_decrypt_init()\fR initialises a context for an asymmetric decryption
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given a provider side asymmetric cipher context in the \fIctx\fR parameter, and a
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pointer to a provider key object in the \fIprovkey\fR parameter.
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The key object should have been previously generated, loaded or imported into
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the provider using the key management (\s-1OSSL_OP_KEYMGMT\s0) operation (see
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\&\fIprovider\-keymgmt\fR\|(7)>.
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.PP
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\&\fIOP_asym_cipher_decrypt()\fR performs the actual decryption itself.
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A previously initialised asymmetric cipher context is passed in the \fIctx\fR
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parameter.
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The data to be decrypted is pointed to by the \fIin\fR parameter which is \fIinlen\fR
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bytes long.
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Unless \fIout\fR is \s-1NULL\s0, the decrypted data should be written to the location
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pointed to by the \fIout\fR parameter and it should not exceed \fIoutsize\fR bytes in
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length.
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The length of the decrypted data should be written to \fI*outlen\fR.
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If \fIout\fR is \s-1NULL\s0 then the maximum length of the decrypted data should be
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written to \fI*outlen\fR.
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.SS "Asymmetric Cipher Parameters"
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.IX Subsection "Asymmetric Cipher Parameters"
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See \s-1\fIOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
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the \fIOP_asym_cipher_get_ctx_params()\fR and \fIOP_asym_cipher_set_ctx_params()\fR
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functions.
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.PP
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\&\fIOP_asym_cipher_get_ctx_params()\fR gets asymmetric cipher parameters associated
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with the given provider side asymmetric cipher context \fIctx\fR and stores them in
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\&\fIparams\fR.
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\&\fIOP_asym_cipher_set_ctx_params()\fR sets the asymmetric cipher parameters associated
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with the given provider side asymmetric cipher context \fIctx\fR to \fIparams\fR.
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Any parameter settings are additional to any that were previously set.
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.PP
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Parameters currently recognised by built-in asymmetric cipher algorithms are as
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follows.
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Not all parameters are relevant to, or are understood by all asymmetric cipher
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algorithms:
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.ie n .IP """pad-mode"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_PAD_MODE\s0\fR) <integer>" 4
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.el .IP "``pad-mode'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_PAD_MODE\s0\fR) <integer>" 4
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.IX Item "pad-mode (OSSL_ASYM_CIPHER_PARAM_PAD_MODE) <integer>"
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The type of padding to be used. The interpretation of this value will depend
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on the algorithm in use. The default provider understands these \s-1RSA\s0 padding
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modes: 1 (\s-1RSA_PKCS1_PADDING\s0), 2 (\s-1RSA_SSLV23_PADDING\s0), 3 (\s-1RSA_NO_PADDING\s0),
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4 (\s-1RSA_PKCS1_OAEP_PADDING\s0), 5 (\s-1RSA_X931_PADDING\s0), 6 (\s-1RSA_PKCS1_PSS_PADDING\s0) and
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7 (\s-1RSA_PKCS1_WITH_TLS_PADDING\s0). See \fIEVP_PKEY_CTX_set_rsa_padding\fR\|(3) for
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further details.
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.ie n .IP """digest"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``digest'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "digest (OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST) <UTF8 string>"
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Gets or sets the name of the \s-1OAEP\s0 digest algorithm used when \s-1OAEP\s0 padding is in
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use.
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.ie n .IP """digest-props"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``digest-props'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "digest-props (OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS) <UTF8 string>"
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Gets or sets the properties to use when fetching the \s-1OAEP\s0 digest algorithm.
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.ie n .IP """mgf1\-digest"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``mgf1\-digest'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "mgf1-digest (OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST) <UTF8 string>"
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Gets or sets the name of the \s-1MGF1\s0 digest algorithm used when \s-1OAEP\s0 or \s-1PSS\s0 padding
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is in use.
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.ie n .IP """mgf1\-digest\-props"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``mgf1\-digest\-props'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "mgf1-digest-props (OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS) <UTF8 string>"
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Gets or sets the properties to use when fetching the \s-1MGF1\s0 digest algorithm.
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.ie n .IP """oaep-label"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL\s0\fR) <octet string>" 4
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.el .IP "``oaep-label'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL\s0\fR) <octet string>" 4
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.IX Item "oaep-label (OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL) <octet string>"
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Gets or sets the \s-1OAEP\s0 label used when \s-1OAEP\s0 padding is in use.
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.ie n .IP """oaep-label-len"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN\s0\fR) <size_t>" 4
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.el .IP "``oaep-label-len'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN\s0\fR) <size_t>" 4
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.IX Item "oaep-label-len (OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN) <size_t>"
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Gets the length of an \s-1OAEP\s0 label when \s-1OAEP\s0 padding is in use.
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.ie n .IP """tls-client-version"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION\s0\fR) <unsigned integer>" 4
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.el .IP "``tls-client-version'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION\s0\fR) <unsigned integer>" 4
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.IX Item "tls-client-version (OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION) <unsigned integer>"
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The \s-1TLS\s0 protocol version first requested by the client. See
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\&\fB\s-1RSA_PKCS1_WITH_TLS_PADDING\s0\fR on the page \fIEVP_PKEY_CTX_set_rsa_padding\fR\|(3).
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.ie n .IP """tls-negotiated-version"" (\fB\s-1OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION\s0\fR) <unsigned integer>" 4
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.el .IP "``tls-negotiated-version'' (\fB\s-1OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION\s0\fR) <unsigned integer>" 4
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.IX Item "tls-negotiated-version (OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION) <unsigned integer>"
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The negotiated \s-1TLS\s0 protocol version. See
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\&\fB\s-1RSA_PKCS1_WITH_TLS_PADDING\s0\fR on the page \fIEVP_PKEY_CTX_set_rsa_padding\fR\|(3).
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.PP
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\&\fIOP_asym_cipher_gettable_ctx_params()\fR and \fIOP_asym_cipher_settable_ctx_params()\fR
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get a constant \fB\s-1OSSL_PARAM\s0\fR array that describes the gettable and settable
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parameters, i.e. parameters that can be used with \fIOP_asym_cipherget_ctx_params()\fR
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and \fIOP_asym_cipher_set_ctx_params()\fR respectively.
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See \s-1\fIOSSL_PARAM\s0\fR\|(3) for the use of \fB\s-1OSSL_PARAM\s0\fR as parameter descriptor.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIOP_asym_cipher_newctx()\fR and \fIOP_asym_cipher_dupctx()\fR should return the newly
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created provider side asymmetric cipher context, or \s-1NULL\s0 on failure.
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.PP
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All other functions should return 1 for success or 0 on error.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIprovider\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The provider \s-1ASYM_CIPHER\s0 interface was introduced in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
|
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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