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Edit File : EVP_PKEY_sign_init.3ssl \| Size : 7.33 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" 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_sign_init, EVP_PKEY_sign \- sign using a public key algorithm .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> \& \& int EVP_PKEY_sign_init(EVP_PKEY_CTX ctx); \& int EVP_PKEY_sign(EVP_PKEY_CTX ctx, \& unsigned char sig, size_t siglen, \& const unsigned char tbs, size_t tbslen); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBEVP_PKEY_sign_init()\fR function initializes a public key algorithm context using key \fBpkey\fR for a signing operation. .PP The \fBEVP_PKEY_sign()\fR function performs a public key signing operation using \fBctx\fR. The data to be signed is specified using the \fBtbs\fR and \&\fBtbslen\fR parameters. If \fBsig\fR is \fB\s-1NULL\s0\fR then the maximum size of the output buffer is written to the \fBsiglen\fR parameter. If \fBsig\fR is not \fB\s-1NULL\s0\fR then before the call the \fBsiglen\fR parameter should contain the length of the \&\fBsig\fR buffer, if the call is successful the signature is written to \&\fBsig\fR and the amount of data written to \fBsiglen\fR. .SH "NOTES" .IX Header "NOTES" \&\fBEVP_PKEY_sign()\fR does not hash the data to be signed, and therefore is normally used to sign digests. For signing arbitrary messages, see the \&\fBEVP_DigestSignInit\fR\\|(3) and \&\fBEVP_SignInit\fR\\|(3) signing interfaces instead. .PP After the call to \fBEVP_PKEY_sign_init()\fR algorithm specific control operations can be performed to set any appropriate parameters for the operation (see \fBEVP_PKEY_CTX_ctrl\fR\\|(3)). .PP The function \fBEVP_PKEY_sign()\fR can be called more than once on the same context if several operations are performed using the same parameters. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBEVP_PKEY_sign_init()\fR and \fBEVP_PKEY_sign()\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 "EXAMPLE" .IX Header "EXAMPLE" Sign data using \s-1RSA\s0 with PKCS#1 padding and \s-1SHA256\s0 digest: .PP .Vb 2 \& #include <openssl/evp.h> \& #include <openssl/rsa.h> \& \& EVP_PKEY_CTX ctx; \& / md is a SHA\-256 digest in this example. / \& unsigned char md, sig; \& size_t mdlen = 32, siglen; \& EVP_PKEY signing_key; \& \& /* \& * NB: assumes signing_key and md are set up before the next \& * step. signing_key must be an RSA private key and md must \& * point to the SHA\-256 digest to be signed. \& / \& ctx = EVP_PKEY_CTX_new(signing_key, NULL / no engine /); \& if (!ctx) \& / Error occurred / \& if (EVP_PKEY_sign_init(ctx) <= 0) \& / Error / \& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0) \& / Error / \& if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0) \& / Error / \& \& / Determine buffer length / \& if (EVP_PKEY_sign(ctx, NULL, &siglen, md, mdlen) <= 0) \& / Error / \& \& sig = OPENSSL_malloc(siglen); \& \& if (!sig) \& / malloc failure / \& \& if (EVP_PKEY_sign(ctx, sig, &siglen, md, mdlen) <= 0) \& / Error / \& \& / Signature is siglen bytes written to buffer sig */ .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_PKEY_CTX_new\fR\\|(3), \&\fBEVP_PKEY_CTX_ctrl\fR\\|(3), \&\fBEVP_PKEY_encrypt\fR\\|(3), \&\fBEVP_PKEY_decrypt\fR\\|(3), \&\fBEVP_PKEY_verify\fR\\|(3), \&\fBEVP_PKEY_verify_recover\fR\\|(3), \&\fBEVP_PKEY_derive\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" These functions were first added to OpenSSL 1.0.0. Back

Edit File : EVP_PKEY_sign_init.3ssl | Size : 7.33 KB

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.\" ========================================================================
.\"
.IX Title "EVP_PKEY_sign 3"
.TH EVP_PKEY_sign 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
EVP_PKEY_sign_init, EVP_PKEY_sign \- sign using a public key algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx);
\& int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
\&                        unsigned char *sig, size_t *siglen,
\&                        const unsigned char *tbs, size_t tbslen);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBEVP_PKEY_sign_init()\fR function initializes a public key algorithm
context using key \fBpkey\fR for a signing operation.
.PP
The \fBEVP_PKEY_sign()\fR function performs a public key signing operation
using \fBctx\fR. The data to be signed is specified using the \fBtbs\fR and
\&\fBtbslen\fR parameters. If \fBsig\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
buffer is written to the \fBsiglen\fR parameter. If \fBsig\fR is not \fB\s-1NULL\s0\fR then
before the call the \fBsiglen\fR parameter should contain the length of the
\&\fBsig\fR buffer, if the call is successful the signature is written to
\&\fBsig\fR and the amount of data written to \fBsiglen\fR.
.SH "NOTES"
.IX Header "NOTES"
\&\fBEVP_PKEY_sign()\fR does not hash the data to be signed, and therefore is
normally used to sign digests. For signing arbitrary messages, see the
\&\fBEVP_DigestSignInit\fR\|(3) and
\&\fBEVP_SignInit\fR\|(3) signing interfaces instead.
.PP
After the call to \fBEVP_PKEY_sign_init()\fR algorithm specific control
operations can be performed to set any appropriate parameters for the
operation (see \fBEVP_PKEY_CTX_ctrl\fR\|(3)).
.PP
The function \fBEVP_PKEY_sign()\fR can be called more than once on the same
context if several operations are performed using the same parameters.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBEVP_PKEY_sign_init()\fR and \fBEVP_PKEY_sign()\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 "EXAMPLE"
.IX Header "EXAMPLE"
Sign data using \s-1RSA\s0 with PKCS#1 padding and \s-1SHA256\s0 digest:
.PP
.Vb 2
\& #include <openssl/evp.h>
\& #include <openssl/rsa.h>
\&
\& EVP_PKEY_CTX *ctx;
\& /* md is a SHA\-256 digest in this example. */
\& unsigned char *md, *sig;
\& size_t mdlen = 32, siglen;
\& EVP_PKEY *signing_key;
\&
\& /*
\&  * NB: assumes signing_key and md are set up before the next
\&  * step. signing_key must be an RSA private key and md must
\&  * point to the SHA\-256 digest to be signed.
\&  */
\& ctx = EVP_PKEY_CTX_new(signing_key, NULL /* no engine */);
\& if (!ctx)
\&        /* Error occurred */
\& if (EVP_PKEY_sign_init(ctx) <= 0)
\&        /* Error */
\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
\&        /* Error */
\& if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
\&        /* Error */
\&
\& /* Determine buffer length */
\& if (EVP_PKEY_sign(ctx, NULL, &siglen, md, mdlen) <= 0)
\&        /* Error */
\&
\& sig = OPENSSL_malloc(siglen);
\&
\& if (!sig)
\&        /* malloc failure */
\& 
\& if (EVP_PKEY_sign(ctx, sig, &siglen, md, mdlen) <= 0)
\&        /* Error */
\&
\& /* Signature is siglen bytes written to buffer sig */
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_PKEY_CTX_new\fR\|(3),
\&\fBEVP_PKEY_CTX_ctrl\fR\|(3),
\&\fBEVP_PKEY_encrypt\fR\|(3),
\&\fBEVP_PKEY_decrypt\fR\|(3),
\&\fBEVP_PKEY_verify\fR\|(3),
\&\fBEVP_PKEY_verify_recover\fR\|(3),
\&\fBEVP_PKEY_derive\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
These functions were first added to OpenSSL 1.0.0.

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