forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
336 lines
11 KiB
Groff
336 lines
11 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "EVP_PKEY_KEYGEN 3"
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.TH EVP_PKEY_KEYGEN 3 "2020-04-21" "1.1.1g" "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_keygen_init, EVP_PKEY_keygen, EVP_PKEY_paramgen_init, EVP_PKEY_paramgen, EVP_PKEY_CTX_set_cb, EVP_PKEY_CTX_get_cb, EVP_PKEY_CTX_get_keygen_info, EVP_PKEY_CTX_set_app_data, EVP_PKEY_CTX_get_app_data, EVP_PKEY_gen_cb, EVP_PKEY_check, EVP_PKEY_public_check, EVP_PKEY_param_check \&\- 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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\& int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey);
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\& int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_paramgen(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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\&
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\& int EVP_PKEY_check(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_public_check(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_param_check(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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The \fBEVP_PKEY_keygen_init()\fR function initializes a public key algorithm
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context using key \fBpkey\fR for a key generation operation.
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.PP
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The \fBEVP_PKEY_keygen()\fR function performs a key generation operation, the
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generated key is written to \fBppkey\fR.
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.PP
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The functions \fBEVP_PKEY_paramgen_init()\fR and \fBEVP_PKEY_paramgen()\fR are similar
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except parameters are generated.
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.PP
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The function \fBEVP_PKEY_set_cb()\fR sets the key or parameter generation callback
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to \fBcb\fR. The function \fBEVP_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 \fBEVP_PKEY_CTX_get_keygen_info()\fR returns parameters associated
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with the generation operation. If \fBidx\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. \fBEVP_PKEY_CTX_gen_keygen_info()\fR with a non-negative value for
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\&\fBidx\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 \fBEVP_PKEY_CTX_set_app_data()\fR and \fBEVP_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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\&\fBEVP_PKEY_check()\fR validates the key-pair given by \fBctx\fR. This function first tries
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to use customized key check method in \fB\s-1EVP_PKEY_METHOD\s0\fR if it's present; otherwise
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it calls a default one defined in \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR.
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.PP
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\&\fBEVP_PKEY_public_check()\fR validates the public component of the key-pair given by \fBctx\fR.
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This function first tries to use customized key check method in \fB\s-1EVP_PKEY_METHOD\s0\fR
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if it's present; otherwise it calls a default one defined in \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR.
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.PP
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\&\fBEVP_PKEY_param_check()\fR validates the algorithm parameters of the key-pair given by \fBctx\fR.
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This function first tries to use customized key check method in \fB\s-1EVP_PKEY_METHOD\s0\fR
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if it's present; otherwise it calls a default one defined in \fB\s-1EVP_PKEY_ASN1_METHOD\s0\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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After the call to \fBEVP_PKEY_keygen_init()\fR or \fBEVP_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 \fBEVP_PKEY_keygen()\fR and \fBEVP_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 "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBEVP_PKEY_keygen_init()\fR, \fBEVP_PKEY_paramgen_init()\fR, \fBEVP_PKEY_keygen()\fR and
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\&\fBEVP_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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\&\fBEVP_PKEY_check()\fR, \fBEVP_PKEY_public_check()\fR and \fBEVP_PKEY_param_check()\fR return 1
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for success or others for failure. They return \-2 if the operation is not supported
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for the specific algorithm.
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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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\&\fBEVP_PKEY_CTX_new\fR\|(3),
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\&\fBEVP_PKEY_encrypt\fR\|(3),
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\&\fBEVP_PKEY_decrypt\fR\|(3),
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\&\fBEVP_PKEY_sign\fR\|(3),
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\&\fBEVP_PKEY_verify\fR\|(3),
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\&\fBEVP_PKEY_verify_recover\fR\|(3),
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\&\fBEVP_PKEY_derive\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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These functions were added in OpenSSL 1.0.0.
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.PP
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\&\fBEVP_PKEY_check()\fR, \fBEVP_PKEY_public_check()\fR and \fBEVP_PKEY_param_check()\fR were added
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in OpenSSL 1.1.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2006\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (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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