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136 .IX Title "EVP_PKEY_sign 3"
137 .TH EVP_PKEY_sign 3 "2006-07-08" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
139 .\" way too many mistakes in technical documents.
140 .if n .ad l
141 .nh
142 .SH "NAME"
143 EVP_PKEY_sign_init, EVP_PKEY_sign \- sign using a public key algorithm
144 .SH "LIBRARY"
145 libcrypto, -lcrypto
146 .SH "SYNOPSIS"
147 .IX Header "SYNOPSIS"
148 .Vb 1
149 \& #include <openssl/evp.h>
150 \&
151 \& int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx);
152 \& int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
153 \& unsigned char *sig, size_t *siglen,
154 \& const unsigned char *tbs, size_t tbslen);
155 .Ve
156 .SH "DESCRIPTION"
157 .IX Header "DESCRIPTION"
158 The \fIEVP_PKEY_sign_init()\fR function initializes a public key algorithm
159 context using key \fBpkey\fR for a signing operation.
160 .PP
161 The \fIEVP_PKEY_sign()\fR function performs a public key signing operation
162 using \fBctx\fR. The data to be signed is specified using the \fBtbs\fR and
163 \&\fBtbslen\fR parameters. If \fBsig\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
164 buffer is written to the \fBsiglen\fR parameter. If \fBsig\fR is not \fB\s-1NULL\s0\fR then
165 before the call the \fBsiglen\fR parameter should contain the length of the
166 \&\fBsig\fR buffer, if the call is successful the signature is written to
167 \&\fBsig\fR and the amount of data written to \fBsiglen\fR.
168 .SH "NOTES"
169 .IX Header "NOTES"
170 After the call to \fIEVP_PKEY_sign_init()\fR algorithm specific control
171 operations can be performed to set any appropriate parameters for the
172 operation.
173 .PP
174 The function \fIEVP_PKEY_sign()\fR can be called more than once on the same
175 context if several operations are performed using the same parameters.
176 .SH "RETURN VALUES"
177 .IX Header "RETURN VALUES"
178 \&\fIEVP_PKEY_sign_init()\fR and \fIEVP_PKEY_sign()\fR return 1 for success and 0
179 or a negative value for failure. In particular a return value of \-2
180 indicates the operation is not supported by the public key algorithm.
181 .SH "EXAMPLE"
182 .IX Header "EXAMPLE"
183 Sign data using \s-1RSA\s0 with PKCS#1 padding and \s-1SHA256\s0 digest:
184 .PP
185 .Vb 2
186 \& #include <openssl/evp.h>
187 \& #include <openssl/rsa.h>
188 \&
189 \& EVP_PKEY_CTX *ctx;
190 \& unsigned char *md, *sig;
191 \& size_t mdlen, siglen;
192 \& EVP_PKEY *signing_key;
193 \& /* NB: assumes signing_key, md and mdlen are already set up
194 \& * and that signing_key is an RSA private key
195 \& */
196 \& ctx = EVP_PKEY_CTX_new(signing_key);
197 \& if (!ctx)
198 \& /* Error occurred */
199 \& if (EVP_PKEY_sign_init(ctx) <= 0)
200 \& /* Error */
201 \& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
202 \& /* Error */
203 \& if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
204 \& /* Error */
205 \&
206 \& /* Determine buffer length */
207 \& if (EVP_PKEY_sign(ctx, NULL, &siglen, md, mdlen) <= 0)
208 \& /* Error */
209 \&
210 \& sig = OPENSSL_malloc(siglen);
211 \&
212 \& if (!sig)
213 \& /* malloc failure */
214 \&
215 \& if (EVP_PKEY_sign(ctx, sig, &siglen, md, mdlen) <= 0)
216 \& /* Error */
217 \&
218 \& /* Signature is siglen bytes written to buffer sig */
219 .Ve
220 .SH "SEE ALSO"
221 .IX Header "SEE ALSO"
222 \&\fIEVP_PKEY_CTX_new\fR\|(3),
223 \&\fIEVP_PKEY_encrypt\fR\|(3),
224 \&\fIEVP_PKEY_decrypt\fR\|(3),
225 \&\fIEVP_PKEY_verify\fR\|(3),
226 \&\fIEVP_PKEY_verifyrecover\fR\|(3),
227 \&\fIEVP_PKEY_derive\fR\|(3)
228 .SH "HISTORY"
229 .IX Header "HISTORY"
230 These functions were first added to OpenSSL 0.9.9.