5 EVP_PKEY_encrypt_init_ex,
6 EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm
10 #include <openssl/evp.h>
12 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx);
13 int EVP_PKEY_encrypt_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);
14 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
15 unsigned char *out, size_t *outlen,
16 const unsigned char *in, size_t inlen);
20 The EVP_PKEY_encrypt_init() function initializes a public key algorithm
21 context using key B<pkey> for an encryption operation.
23 The EVP_PKEY_encrypt_init_ex() function initializes a public key algorithm
24 context using key B<pkey> for an encryption operation and sets the
25 algorithm specific B<params>.
27 The EVP_PKEY_encrypt() function performs a public key encryption operation
28 using B<ctx>. The data to be encrypted is specified using the B<in> and
29 B<inlen> parameters. If B<out> is B<NULL> then the maximum size of the output
30 buffer is written to the B<outlen> parameter. If B<out> is not B<NULL> then
31 before the call the B<outlen> parameter should contain the length of the
32 B<out> buffer, if the call is successful the encrypted data is written to
33 B<out> and the amount of data written to B<outlen>.
37 After the call to EVP_PKEY_encrypt_init() algorithm specific control
38 operations can be performed to set any appropriate parameters for the
39 operation. These operations can be included in the EVP_PKEY_encrypt_init_ex()
42 The function EVP_PKEY_encrypt() can be called more than once on the same
43 context if several operations are performed using the same parameters.
47 EVP_PKEY_encrypt_init(), EVP_PKEY_encrypt_init_ex() and EVP_PKEY_encrypt()
48 return 1 for success and 0 or a negative value for failure. In particular a
49 return value of -2 indicates the operation is not supported by the public key
54 Encrypt data using OAEP (for RSA keys). See also L<PEM_read_PUBKEY(3)> or
55 L<d2i_X509(3)> for means to load a public key. You may also simply
56 set 'eng = NULL;' to start with the default OpenSSL RSA implementation:
58 #include <openssl/evp.h>
59 #include <openssl/rsa.h>
60 #include <openssl/engine.h>
64 unsigned char *out, *in;
69 * NB: assumes eng, key, in, inlen are already set up,
70 * and that key is an RSA public key
72 ctx = EVP_PKEY_CTX_new(key, eng);
75 if (EVP_PKEY_encrypt_init(ctx) <= 0)
77 if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
80 /* Determine buffer length */
81 if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0)
84 out = OPENSSL_malloc(outlen);
89 if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0)
92 /* Encrypted data is outlen bytes written to buffer out */
98 L<EVP_PKEY_CTX_new(3)>,
99 L<EVP_PKEY_decrypt(3)>,
101 L<EVP_PKEY_verify(3)>,
102 L<EVP_PKEY_verify_recover(3)>,
103 L<EVP_PKEY_derive(3)>
107 These functions were added in OpenSSL 1.0.0.
111 Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
113 Licensed under the Apache License 2.0 (the "License"). You may not use
114 this file except in compliance with the License. You can obtain a copy
115 in the file LICENSE in the source distribution or at
116 L<https://www.openssl.org/source/license.html>.