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Diffstat (limited to 'secure/lib/libcrypto/man/EVP_PKEY_keygen.3')
| -rw-r--r-- | secure/lib/libcrypto/man/EVP_PKEY_keygen.3 | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/EVP_PKEY_keygen.3 b/secure/lib/libcrypto/man/EVP_PKEY_keygen.3 new file mode 100644 index 0000000..8e76de1 --- /dev/null +++ b/secure/lib/libcrypto/man/EVP_PKEY_keygen.3 @@ -0,0 +1,288 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.23) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +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_PKEVP_PKEY_CTX_set_app_data, EVP_PKEY_CTX_get_app_data \- key and parameter generation functions +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/evp.h> +\& +\& int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx); +\& int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey); +\& int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx); +\& int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey); +\& +\& typedef int EVP_PKEY_gen_cb(EVP_PKEY_CTX *ctx); +\& +\& void EVP_PKEY_CTX_set_cb(EVP_PKEY_CTX *ctx, EVP_PKEY_gen_cb *cb); +\& EVP_PKEY_gen_cb *EVP_PKEY_CTX_get_cb(EVP_PKEY_CTX *ctx); +\& +\& int EVP_PKEY_CTX_get_keygen_info(EVP_PKEY_CTX *ctx, int idx); +\& +\& void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data); +\& void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +The \fIEVP_PKEY_keygen_init()\fR function initializes a public key algorithm +context using key \fBpkey\fR for a key genration operation. +.PP +The \fIEVP_PKEY_keygen()\fR function performs a key generation operation, the +generated key is written to \fBppkey\fR. +.PP +The functions \fIEVP_PKEY_paramgen_init()\fR and \fIEVP_PKEY_paramgen()\fR are similar +except parameters are generated. +.PP +The function \fIEVP_PKEY_set_cb()\fR sets the key or parameter generation callback +to \fBcb\fR. The function \fIEVP_PKEY_CTX_get_cb()\fR returns the key or parameter +generation callback. +.PP +The function \fIEVP_PKEY_CTX_get_keygen_info()\fR returns parameters associated +with the generation operation. If \fBidx\fR is \-1 the total number of +parameters available is returned. Any non negative value returns the value of +that parameter. \fIEVP_PKEY_CTX_gen_keygen_info()\fR with a non-negative value for +\&\fBidx\fR should only be called within the generation callback. +.PP +If the callback returns 0 then the key genration operation is aborted and an +error occurs. This might occur during a time consuming operation where +a user clicks on a \*(L"cancel\*(R" button. +.PP +The functions \fIEVP_PKEY_CTX_set_app_data()\fR and \fIEVP_PKEY_CTX_get_app_data()\fR set +and retrieve an opaque pointer. This can be used to set some application +defined value which can be retrieved in the callback: for example a handle +which is used to update a \*(L"progress dialog\*(R". +.SH "NOTES" +.IX Header "NOTES" +After the call to \fIEVP_PKEY_keygen_init()\fR or \fIEVP_PKEY_paramgen_init()\fR algorithm +specific control operations can be performed to set any appropriate parameters +for the operation. +.PP +The functions \fIEVP_PKEY_keygen()\fR and \fIEVP_PKEY_paramgen()\fR can be called more than +once on the same context if several operations are performed using the same +parameters. +.PP +The meaning of the parameters passed to the callback will depend on the +algorithm and the specifiic implementation of the algorithm. Some might not +give any useful information at all during key or parameter generation. Others +might not even call the callback. +.PP +The operation performed by key or parameter generation depends on the algorithm +used. In some cases (e.g. \s-1EC\s0 with a supplied named curve) the \*(L"generation\*(R" +option merely sets the appropriate fields in an \s-1EVP_PKEY\s0 structure. +.PP +In OpenSSL an \s-1EVP_PKEY\s0 structure containing a private key also contains the +public key components and parameters (if any). An OpenSSL private key is +equivalent to what some libraries call a \*(L"key pair\*(R". A private key can be used +in functions which require the use of a public key or parameters. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIEVP_PKEY_keygen_init()\fR, \fIEVP_PKEY_paramgen_init()\fR, \fIEVP_PKEY_keygen()\fR and +\&\fIEVP_PKEY_paramgen()\fR return 1 for success and 0 or a negative value for failure. +In particular a return value of \-2 indicates the operation is not supported by +the public key algorithm. +.SH "EXAMPLES" +.IX Header "EXAMPLES" +Generate a 2048 bit \s-1RSA\s0 key: +.PP +.Vb 2 +\& #include <openssl/evp.h> +\& #include <openssl/rsa.h> +\& +\& EVP_PKEY_CTX *ctx; +\& EVP_PKEY *pkey = NULL; +\& ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL); +\& if (!ctx) +\& /* Error occurred */ +\& if (EVP_PKEY_keygen_init(ctx) <= 0) +\& /* Error */ +\& if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, 2048) <= 0) +\& /* Error */ +\& +\& /* Generate key */ +\& if (EVP_PKEY_keygen(ctx, &pkey) <= 0) +\& /* Error */ +.Ve +.PP +Generate a key from a set of parameters: +.PP +.Vb 2 +\& #include <openssl/evp.h> +\& #include <openssl/rsa.h> +\& +\& EVP_PKEY_CTX *ctx; +\& EVP_PKEY *pkey = NULL, *param; +\& /* Assumed param is set up already */ +\& ctx = EVP_PKEY_CTX_new(param); +\& if (!ctx) +\& /* Error occurred */ +\& if (EVP_PKEY_keygen_init(ctx) <= 0) +\& /* Error */ +\& +\& /* Generate key */ +\& if (EVP_PKEY_keygen(ctx, &pkey) <= 0) +\& /* Error */ +.Ve +.PP +Example of generation callback for OpenSSL public key implementations: +.PP +.Vb 1 +\& /* Application data is a BIO to output status to */ +\& +\& EVP_PKEY_CTX_set_app_data(ctx, status_bio); +\& +\& static int genpkey_cb(EVP_PKEY_CTX *ctx) +\& { +\& char c=\*(Aq*\*(Aq; +\& BIO *b = EVP_PKEY_CTX_get_app_data(ctx); +\& int p; +\& p = EVP_PKEY_CTX_get_keygen_info(ctx, 0); +\& if (p == 0) c=\*(Aq.\*(Aq; +\& if (p == 1) c=\*(Aq+\*(Aq; +\& if (p == 2) c=\*(Aq*\*(Aq; +\& if (p == 3) c=\*(Aq\en\*(Aq; +\& BIO_write(b,&c,1); +\& (void)BIO_flush(b); +\& return 1; +\& } +.Ve +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIEVP_PKEY_CTX_new\fR\|(3), +\&\fIEVP_PKEY_encrypt\fR\|(3), +\&\fIEVP_PKEY_decrypt\fR\|(3), +\&\fIEVP_PKEY_sign\fR\|(3), +\&\fIEVP_PKEY_verify\fR\|(3), +\&\fIEVP_PKEY_verify_recover\fR\|(3), +\&\fIEVP_PKEY_derive\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +These functions were first added to OpenSSL 1.0.0. |
