372 lines
13 KiB
Plaintext
372 lines
13 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_PKEY_KEYGEN 3ossl"
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.TH EVP_PKEY_KEYGEN 3ossl "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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EVP_PKEY_Q_keygen,
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EVP_PKEY_keygen_init, EVP_PKEY_paramgen_init, EVP_PKEY_generate,
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EVP_PKEY_CTX_set_cb, EVP_PKEY_CTX_get_cb,
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EVP_PKEY_CTX_get_keygen_info, EVP_PKEY_CTX_set_app_data,
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EVP_PKEY_CTX_get_app_data,
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EVP_PKEY_gen_cb,
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EVP_PKEY_paramgen, EVP_PKEY_keygen
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\&\- key and parameter generation and check functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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\&
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\& EVP_PKEY *EVP_PKEY_Q_keygen(OSSL_LIB_CTX *libctx, const char *propq,
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\& const char *type, ...);
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\&
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\& int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_generate(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey);
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\& int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey);
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\& int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey);
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\&
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\& typedef int EVP_PKEY_gen_cb(EVP_PKEY_CTX *ctx);
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\&
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\& void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb);
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\& EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx);
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\&
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\& int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx);
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\&
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\& void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data);
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\& void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Generating keys is sometimes straight forward, just generate the key's
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numbers and be done with it. However, there are certain key types that need
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key parameters, often called domain parameters but not necessarily limited
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to that, that also need to be generated. In addition to this, the caller
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may want to set user provided generation parameters that further affect key
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parameter or key generation, such as the desired key size.
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.PP
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To flexibly allow all that's just been described, key parameter and key
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generation is divided into an initialization of a key algorithm context,
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functions to set user provided parameters, and finally the key parameter or
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key generation function itself.
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.PP
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The key algorithm context must be created using \fIEVP_PKEY_CTX_new\fR\|(3) or
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variants thereof, see that manual for details.
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.PP
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\&\fIEVP_PKEY_keygen_init()\fR initializes a public key algorithm context \fIctx\fR
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for a key generation operation.
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.PP
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\&\fIEVP_PKEY_paramgen_init()\fR is similar to \fIEVP_PKEY_keygen_init()\fR except key
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parameters are generated.
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.PP
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After initialization, generation parameters may be provided with
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\&\fIEVP_PKEY_CTX_ctrl\fR\|(3) or \fIEVP_PKEY_CTX_set_params\fR\|(3), or any other
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function described in those manuals.
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.PP
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\&\fIEVP_PKEY_generate()\fR performs the generation operation, the resulting key
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parameters or key are written to \fI*ppkey\fR. If \fI*ppkey\fR is \s-1NULL\s0 when this
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function is called, it will be allocated, and should be freed by the caller
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when no longer useful, using \fIEVP_PKEY_free\fR\|(3).
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.PP
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\&\fIEVP_PKEY_paramgen()\fR and \fIEVP_PKEY_keygen()\fR do exactly the same thing as
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\&\fIEVP_PKEY_generate()\fR, after checking that the corresponding \fIEVP_PKEY_paramgen_init()\fR
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or \fIEVP_PKEY_keygen_init()\fR was used to initialize \fIctx\fR.
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These are older functions that are kept for backward compatibility.
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It is safe to use \fIEVP_PKEY_generate()\fR instead.
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.PP
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The function \fIEVP_PKEY_set_cb()\fR sets the key or parameter generation callback
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to \fIcb\fR. The function \fIEVP_PKEY_CTX_get_cb()\fR returns the key or parameter
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generation callback.
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.PP
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The function \fIEVP_PKEY_CTX_get_keygen_info()\fR returns parameters associated
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with the generation operation. If \fIidx\fR is \-1 the total number of
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parameters available is returned. Any non negative value returns the value of
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that parameter. \fIEVP_PKEY_CTX_gen_keygen_info()\fR with a nonnegative value for
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\&\fIidx\fR should only be called within the generation callback.
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.PP
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If the callback returns 0 then the key generation operation is aborted and an
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error occurs. This might occur during a time consuming operation where
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a user clicks on a \*(L"cancel\*(R" button.
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.PP
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The functions \fIEVP_PKEY_CTX_set_app_data()\fR and \fIEVP_PKEY_CTX_get_app_data()\fR set
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and retrieve an opaque pointer. This can be used to set some application
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defined value which can be retrieved in the callback: for example a handle
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which is used to update a \*(L"progress dialog\*(R".
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.PP
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\&\fIEVP_PKEY_Q_keygen()\fR abstracts from the explicit use of \fB\s-1EVP_PKEY_CTX\s0\fR while
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providing a 'quick' but limited way of generating a new asymmetric key pair.
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It provides shorthands for simple and common cases of key generation.
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As usual, the library context \fIlibctx\fR and property query \fIpropq\fR
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can be given for fetching algorithms from providers.
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If \fItype\fR is \f(CW\*(C`RSA\*(C'\fR,
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a \fBsize_t\fR parameter must be given to specify the size of the \s-1RSA\s0 key.
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If \fItype\fR is \f(CW\*(C`EC\*(C'\fR,
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a string parameter must be given to specify the name of the \s-1EC\s0 curve.
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If \fItype\fR is \f(CW\*(C`X25519\*(C'\fR, \f(CW\*(C`X448\*(C'\fR, \f(CW\*(C`ED25519\*(C'\fR, \f(CW\*(C`ED448\*(C'\fR, or \f(CW\*(C`SM2\*(C'\fR
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no further parameter is needed.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_PKEY_keygen_init()\fR, \fIEVP_PKEY_paramgen_init()\fR, \fIEVP_PKEY_keygen()\fR and
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\&\fIEVP_PKEY_paramgen()\fR return 1 for success and 0 or a negative value for failure.
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In particular a return value of \-2 indicates the operation is not supported by
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the public key algorithm.
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.PP
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\&\fIEVP_PKEY_Q_keygen()\fR returns an \fB\s-1EVP_PKEY\s0\fR, or \s-1NULL\s0 on failure.
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.SH "NOTES"
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.IX Header "NOTES"
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After the call to \fIEVP_PKEY_keygen_init()\fR or \fIEVP_PKEY_paramgen_init()\fR algorithm
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specific control operations can be performed to set any appropriate parameters
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for the operation.
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.PP
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The functions \fIEVP_PKEY_keygen()\fR and \fIEVP_PKEY_paramgen()\fR can be called more than
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once on the same context if several operations are performed using the same
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parameters.
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.PP
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The meaning of the parameters passed to the callback will depend on the
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algorithm and the specific implementation of the algorithm. Some might not
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give any useful information at all during key or parameter generation. Others
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might not even call the callback.
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.PP
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The operation performed by key or parameter generation depends on the algorithm
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used. In some cases (e.g. \s-1EC\s0 with a supplied named curve) the \*(L"generation\*(R"
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option merely sets the appropriate fields in an \s-1EVP_PKEY\s0 structure.
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.PP
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In OpenSSL an \s-1EVP_PKEY\s0 structure containing a private key also contains the
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public key components and parameters (if any). An OpenSSL private key is
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equivalent to what some libraries call a \*(L"key pair\*(R". A private key can be used
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in functions which require the use of a public key or parameters.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Generate a 2048 bit \s-1RSA\s0 key:
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.PP
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.Vb 2
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\& #include <openssl/evp.h>
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\& #include <openssl/rsa.h>
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\&
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\& EVP_PKEY_CTX *ctx;
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\& EVP_PKEY *pkey = NULL;
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\&
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\& ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL);
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\& if (!ctx)
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\& /* Error occurred */
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\& if (EVP_PKEY_keygen_init(ctx) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, 2048) <= 0)
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\& /* Error */
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\&
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\& /* Generate key */
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\& if (EVP_PKEY_keygen(ctx, &pkey) <= 0)
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\& /* Error */
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.Ve
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.PP
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Generate a key from a set of parameters:
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.PP
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.Vb 2
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\& #include <openssl/evp.h>
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\& #include <openssl/rsa.h>
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\&
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\& EVP_PKEY_CTX *ctx;
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\& ENGINE *eng;
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\& EVP_PKEY *pkey = NULL, *param;
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\&
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\& /* Assumed param, eng are set up already */
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\& ctx = EVP_PKEY_CTX_new(param, eng);
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\& if (!ctx)
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\& /* Error occurred */
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\& if (EVP_PKEY_keygen_init(ctx) <= 0)
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\& /* Error */
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\&
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\& /* Generate key */
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\& if (EVP_PKEY_keygen(ctx, &pkey) <= 0)
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\& /* Error */
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.Ve
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.PP
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Example of generation callback for OpenSSL public key implementations:
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.PP
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.Vb 1
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\& /* Application data is a BIO to output status to */
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\&
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\& EVP_PKEY_CTX_set_app_data(ctx, status_bio);
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\&
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\& static int genpkey_cb(EVP_PKEY_CTX *ctx)
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\& {
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\& char c = \*(Aq*\*(Aq;
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\& BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
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\& int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
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\&
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\& if (p == 0)
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\& c = \*(Aq.\*(Aq;
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\& if (p == 1)
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\& c = \*(Aq+\*(Aq;
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\& if (p == 2)
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\& c = \*(Aq*\*(Aq;
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\& if (p == 3)
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\& c = \*(Aq\en\*(Aq;
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\& BIO_write(b, &c, 1);
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\& (void)BIO_flush(b);
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\& return 1;
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\& }
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_RSA_gen\fR\|(3), \fIEVP_EC_gen\fR\|(3),
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\&\fIEVP_PKEY_CTX_new\fR\|(3),
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\&\fIEVP_PKEY_encrypt\fR\|(3),
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\&\fIEVP_PKEY_decrypt\fR\|(3),
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\&\fIEVP_PKEY_sign\fR\|(3),
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\&\fIEVP_PKEY_verify\fR\|(3),
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\&\fIEVP_PKEY_verify_recover\fR\|(3),
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\&\fIEVP_PKEY_derive\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIEVP_PKEY_keygen_init()\fR, int \fIEVP_PKEY_paramgen_init()\fR, \fIEVP_PKEY_keygen()\fR,
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\&\fIEVP_PKEY_paramgen()\fR, \fIEVP_PKEY_gen_cb()\fR, \fIEVP_PKEY_CTX_set_cb()\fR,
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\&\fIEVP_PKEY_CTX_get_cb()\fR, \fIEVP_PKEY_CTX_get_keygen_info()\fR,
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\&\fIEVP_PKEY_CTX_set_app_data()\fR and \fIEVP_PKEY_CTX_get_app_data()\fR were added in
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OpenSSL 1.0.0.
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.PP
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\&\fIEVP_PKEY_Q_keygen()\fR and \fIEVP_PKEY_generate()\fR were added in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2006\-2021 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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