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135 .IX Title "EVP_PKEY_decrypt 3"
136 .TH EVP_PKEY_decrypt 3 "2015-03-19" "1.0.1m" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 EVP_PKEY_decrypt_init, EVP_PKEY_decrypt \- decrypt using a public key algorithm
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/evp.h>
148 \& int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
149 \& int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
150 \& unsigned char *out, size_t *outlen,
151 \& const unsigned char *in, size_t inlen);
154 .IX Header "DESCRIPTION"
155 The \fIEVP_PKEY_decrypt_init()\fR function initializes a public key algorithm
156 context using key \fBpkey\fR for a decryption operation.
158 The \fIEVP_PKEY_decrypt()\fR function performs a public key decryption operation
159 using \fBctx\fR. The data to be decrypted is specified using the \fBin\fR and
160 \&\fBinlen\fR parameters. If \fBout\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
161 buffer is written to the \fBoutlen\fR parameter. If \fBout\fR is not \fB\s-1NULL\s0\fR then
162 before the call the \fBoutlen\fR parameter should contain the length of the
163 \&\fBout\fR buffer, if the call is successful the decrypted data is written to
164 \&\fBout\fR and the amount of data written to \fBoutlen\fR.
167 After the call to \fIEVP_PKEY_decrypt_init()\fR algorithm specific control
168 operations can be performed to set any appropriate parameters for the
171 The function \fIEVP_PKEY_decrypt()\fR can be called more than once on the same
172 context if several operations are performed using the same parameters.
174 .IX Header "RETURN VALUES"
175 \&\fIEVP_PKEY_decrypt_init()\fR and \fIEVP_PKEY_decrypt()\fR return 1 for success and 0
176 or a negative value for failure. In particular a return value of \-2
177 indicates the operation is not supported by the public key algorithm.
180 Decrypt data using \s-1OAEP \s0(for \s-1RSA\s0 keys):
183 \& #include <openssl/evp.h>
184 \& #include <openssl/rsa.h>
186 \& EVP_PKEY_CTX *ctx;
187 \& unsigned char *out, *in;
188 \& size_t outlen, inlen;
190 \& /* NB: assumes key in, inlen are already set up
191 \& * and that key is an RSA private key
193 \& ctx = EVP_PKEY_CTX_new(key);
195 \& /* Error occurred */
196 \& if (EVP_PKEY_decrypt_init(ctx) <= 0)
198 \& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
201 \& /* Determine buffer length */
202 \& if (EVP_PKEY_decrypt(ctx, NULL, &outlen, in, inlen) <= 0)
205 \& out = OPENSSL_malloc(outlen);
208 \& /* malloc failure */
210 \& if (EVP_PKEY_decrypt(ctx, out, &outlen, in, inlen) <= 0)
213 \& /* Decrypted data is outlen bytes written to buffer out */
216 .IX Header "SEE ALSO"
217 \&\fIEVP_PKEY_CTX_new\fR\|(3),
218 \&\fIEVP_PKEY_encrypt\fR\|(3),
219 \&\fIEVP_PKEY_sign\fR\|(3),
220 \&\fIEVP_PKEY_verify\fR\|(3),
221 \&\fIEVP_PKEY_verify_recover\fR\|(3),
222 \&\fIEVP_PKEY_derive\fR\|(3)
225 These functions were first added to OpenSSL 1.0.0.