b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
108 lines
3.1 KiB
Text
108 lines
3.1 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx);
|
|
int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
|
|
unsigned char *out, size_t *outlen,
|
|
const unsigned char *in, size_t inlen);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The EVP_PKEY_encrypt_init() function initializes a public key algorithm
|
|
context using key B<pkey> for an encryption operation.
|
|
|
|
The EVP_PKEY_encrypt() function performs a public key encryption operation
|
|
using B<ctx>. The data to be encrypted is specified using the B<in> and
|
|
B<inlen> parameters. If B<out> is B<NULL> then the maximum size of the output
|
|
buffer is written to the B<outlen> parameter. If B<out> is not B<NULL> then
|
|
before the call the B<outlen> parameter should contain the length of the
|
|
B<out> buffer, if the call is successful the encrypted data is written to
|
|
B<out> and the amount of data written to B<outlen>.
|
|
|
|
=head1 NOTES
|
|
|
|
After the call to EVP_PKEY_encrypt_init() algorithm specific control
|
|
operations can be performed to set any appropriate parameters for the
|
|
operation.
|
|
|
|
The function EVP_PKEY_encrypt() can be called more than once on the same
|
|
context if several operations are performed using the same parameters.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
EVP_PKEY_encrypt_init() and EVP_PKEY_encrypt() 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.
|
|
|
|
=head1 EXAMPLE
|
|
|
|
Encrypt data using OAEP (for RSA keys). See also L<PEM_read_PUBKEY(3)> or
|
|
L<d2i_X509(3)> for means to load a public key. You may also simply
|
|
set 'eng = NULL;' to start with the default OpenSSL RSA implementation:
|
|
|
|
#include <openssl/evp.h>
|
|
#include <openssl/rsa.h>
|
|
#include <openssl/engine.h>
|
|
|
|
EVP_PKEY_CTX *ctx;
|
|
ENGINE *eng;
|
|
unsigned char *out, *in;
|
|
size_t outlen, inlen;
|
|
EVP_PKEY *key;
|
|
/* NB: assumes eng, key, in, inlen are already set up,
|
|
* and that key is an RSA public key
|
|
*/
|
|
ctx = EVP_PKEY_CTX_new(key, eng);
|
|
if (!ctx)
|
|
/* Error occurred */
|
|
if (EVP_PKEY_encrypt_init(ctx) <= 0)
|
|
/* Error */
|
|
if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
|
|
/* Error */
|
|
|
|
/* Determine buffer length */
|
|
if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0)
|
|
/* Error */
|
|
|
|
out = OPENSSL_malloc(outlen);
|
|
|
|
if (!out)
|
|
/* malloc failure */
|
|
|
|
if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0)
|
|
/* Error */
|
|
|
|
/* Encrypted data is outlen bytes written to buffer out */
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<d2i_X509(3)>,
|
|
L<ENGINE_by_id(3)>,
|
|
L<EVP_PKEY_CTX_new(3)>,
|
|
L<EVP_PKEY_decrypt(3)>,
|
|
L<EVP_PKEY_sign(3)>,
|
|
L<EVP_PKEY_verify(3)>,
|
|
L<EVP_PKEY_verify_recover(3)>,
|
|
L<EVP_PKEY_derive(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
These functions were first added to OpenSSL 1.0.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|