234 lines
7.3 KiB
Groff
234 lines
7.3 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "EVP_PKEY_sign 3"
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.TH EVP_PKEY_sign 3 "2017-05-25" "1.0.2l" "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_sign_init, EVP_PKEY_sign \- sign using a public key algorithm
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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_sign_init(EVP_PKEY_CTX *ctx);
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\& int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
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\& unsigned char *sig, size_t *siglen,
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\& const unsigned char *tbs, size_t tbslen);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fIEVP_PKEY_sign_init()\fR function initializes a public key algorithm
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context using key \fBpkey\fR for a signing operation.
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.PP
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The \fIEVP_PKEY_sign()\fR function performs a public key signing operation
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using \fBctx\fR. The data to be signed is specified using the \fBtbs\fR and
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\&\fBtbslen\fR parameters. If \fBsig\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
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buffer is written to the \fBsiglen\fR parameter. If \fBsig\fR is not \fB\s-1NULL\s0\fR then
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before the call the \fBsiglen\fR parameter should contain the length of the
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\&\fBsig\fR buffer, if the call is successful the signature is written to
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\&\fBsig\fR and the amount of data written to \fBsiglen\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fIEVP_PKEY_sign()\fR does not hash the data to be signed, and therefore is
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normally used to sign digests. For signing arbitrary messages, see the
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\&\fIEVP_DigestSignInit\fR\|(3) and
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\&\fIEVP_SignInit\fR\|(3) signing interfaces instead.
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.PP
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After the call to \fIEVP_PKEY_sign_init()\fR algorithm specific control
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operations can be performed to set any appropriate parameters for the
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operation (see \fIEVP_PKEY_CTX_ctrl\fR\|(3)).
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.PP
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The function \fIEVP_PKEY_sign()\fR can be called more than once on the same
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context if several operations are performed using the same parameters.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_PKEY_sign_init()\fR and \fIEVP_PKEY_sign()\fR return 1 for success and 0
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or a negative value for failure. In particular a return value of \-2
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indicates the operation is not supported by the public key algorithm.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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Sign data using \s-1RSA\s0 with PKCS#1 padding and \s-1SHA256\s0 digest:
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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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\& /* md is a SHA\-256 digest in this example. */
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\& unsigned char *md, *sig;
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\& size_t mdlen = 32, siglen;
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\& EVP_PKEY *signing_key;
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\&
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\& /*
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\& * NB: assumes signing_key and md are set up before the next
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\& * step. signing_key must be an RSA private key and md must
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\& * point to the SHA\-256 digest to be signed.
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\& */
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\& ctx = EVP_PKEY_CTX_new(signing_key, NULL /* no engine */);
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\& if (!ctx)
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\& /* Error occurred */
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\& if (EVP_PKEY_sign_init(ctx) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
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\& /* Error */
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\& if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
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\& /* Error */
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\&
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\& /* Determine buffer length */
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\& if (EVP_PKEY_sign(ctx, NULL, &siglen, md, mdlen) <= 0)
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\& /* Error */
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\&
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\& sig = OPENSSL_malloc(siglen);
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\&
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\& if (!sig)
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\& /* malloc failure */
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\&
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\& if (EVP_PKEY_sign(ctx, sig, &siglen, md, mdlen) <= 0)
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\& /* Error */
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\&
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\& /* Signature is siglen bytes written to buffer sig */
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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_PKEY_CTX_new\fR\|(3),
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\&\fIEVP_PKEY_CTX_ctrl\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_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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These functions were first added to OpenSSL 1.0.0.
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