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.\" ========================================================================
.\"
.IX Title "EVP_PKEY_decrypt 3openssl"
.TH EVP_PKEY_decrypt 3openssl "2016-05-03" "1.0.1t" "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_decrypt_init, EVP_PKEY_decrypt \- decrypt using a public key algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/evp.h>
\&
\& int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
\& int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
\&                        unsigned char *out, size_t *outlen,
\&                        const unsigned char *in, size_t inlen);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fIEVP_PKEY_decrypt_init()\fR function initializes a public key algorithm
context using key \fBpkey\fR for a decryption operation.
.PP
The \fIEVP_PKEY_decrypt()\fR function performs a public key decryption operation
using \fBctx\fR. The data to be decrypted is specified using the \fBin\fR and
\&\fBinlen\fR parameters. If \fBout\fR is \fB\s-1NULL\s0\fR then the maximum size of the output
buffer is written to the \fBoutlen\fR parameter. If \fBout\fR is not \fB\s-1NULL\s0\fR then
before the call the \fBoutlen\fR parameter should contain the length of the
\&\fBout\fR buffer, if the call is successful the decrypted data is written to
\&\fBout\fR and the amount of data written to \fBoutlen\fR.

.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	library/security/openssl
=
Stability	Uncommitted
.TE 
.PP
.SH "NOTES"
.IX Header "NOTES"
After the call to \fIEVP_PKEY_decrypt_init()\fR algorithm specific control
operations can be performed to set any appropriate parameters for the
operation.
.PP
The function \fIEVP_PKEY_decrypt()\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"
\&\fIEVP_PKEY_decrypt_init()\fR and \fIEVP_PKEY_decrypt()\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"
Decrypt data using \s-1OAEP\s0 (for \s-1RSA\s0 keys):
.PP
.Vb 2
\& #include <openssl/evp.h>
\& #include <openssl/rsa.h>
\&
\& EVP_PKEY_CTX *ctx;
\& unsigned char *out, *in;
\& size_t outlen, inlen; 
\& EVP_PKEY *key;
\& /* NB: assumes key in, inlen are already set up
\&  * and that key is an RSA private key
\&  */
\& ctx = EVP_PKEY_CTX_new(key);
\& if (!ctx)
\&        /* Error occurred */
\& if (EVP_PKEY_decrypt_init(ctx) <= 0)
\&        /* Error */
\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
\&        /* Error */
\&
\& /* Determine buffer length */
\& if (EVP_PKEY_decrypt(ctx, NULL, &outlen, in, inlen) <= 0)
\&        /* Error */
\&
\& out = OPENSSL_malloc(outlen);
\&
\& if (!out)
\&        /* malloc failure */
\& 
\& if (EVP_PKEY_decrypt(ctx, out, &outlen, in, inlen) <= 0)
\&        /* Error */
\&
\& /* Decrypted data is outlen bytes written to buffer out */
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIEVP_PKEY_CTX_new\fR\|(3),
\&\fIEVP_PKEY_encrypt\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.


.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.openssl.org/source/openssl-1.0.1t.tar.gz

Further information about this software can be found on the open source community website at http://www.openssl.org/.