5 EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm
9 #include <openssl/evp.h>
11 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx);
12 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
13 unsigned char *out, size_t *outlen,
14 const unsigned char *in, size_t inlen);
18 The EVP_PKEY_encrypt_init() function initializes a public key algorithm
19 context using key B<pkey> for an encryption operation.
21 The EVP_PKEY_encrypt() function performs a public key encryption operation
22 using B<ctx>. The data to be encrypted is specified using the B<in> and
23 B<inlen> parameters. If B<out> is B<NULL> then the maximum size of the output
24 buffer is written to the B<outlen> parameter. If B<out> is not B<NULL> then
25 before the call the B<outlen> parameter should contain the length of the
26 B<out> buffer, if the call is successful the encrypted data is written to
27 B<out> and the amount of data written to B<outlen>.
31 After the call to EVP_PKEY_encrypt_init() algorithm specific control
32 operations can be performed to set any appropriate parameters for the
35 The function EVP_PKEY_encrypt() can be called more than once on the same
36 context if several operations are performed using the same parameters.
40 EVP_PKEY_encrypt_init() and EVP_PKEY_encrypt() return 1 for success and 0
41 or a negative value for failure. In particular a return value of -2
42 indicates the operation is not supported by the public key algorithm.
46 Encrypt data using OAEP (for RSA keys). See also L<PEM_read_PUBKEY(3)> or
47 L<d2i_X509(3)> for means to load a public key. You may also simply
48 set 'eng = NULL;' to start with the default OpenSSL RSA implementation:
50 #include <openssl/evp.h>
51 #include <openssl/rsa.h>
52 #include <openssl/engine.h>
56 unsigned char *out, *in;
59 /* NB: assumes eng, key, in, inlen are already set up,
60 * and that key is an RSA public key
62 ctx = EVP_PKEY_CTX_new(key, eng);
65 if (EVP_PKEY_encrypt_init(ctx) <= 0)
67 if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
70 /* Determine buffer length */
71 if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0)
74 out = OPENSSL_malloc(outlen);
79 if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0)
82 /* Encrypted data is outlen bytes written to buffer out */
88 L<EVP_PKEY_CTX_new(3)>,
89 L<EVP_PKEY_decrypt(3)>,
91 L<EVP_PKEY_verify(3)>,
92 L<EVP_PKEY_verify_recover(3)>,
97 These functions were first added to OpenSSL 1.0.0.
101 Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
103 Licensed under the OpenSSL license (the "License"). You may not use
104 this file except in compliance with the License. You can obtain a copy
105 in the file LICENSE in the source distribution or at
106 L<https://www.openssl.org/source/license.html>.