from small one page howto to huge articles all in one place
 

search text in:





Poll
Which kernel version do you use?





poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

186387

userrating:

average rating: 1.7 (102 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

250363

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

137545

userrating:

average rating: 1.4 (42 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion
You are here: manpages





EVP_PKEY_encrypt

Section: OpenSSL (3)
Updated: 2017-05-25
Index Return to Main Contents
 

NAME

EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm  

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);

 

DESCRIPTION

The EVP_PKEY_encrypt_init() function initializes a public key algorithm context using key pkey for an encryption operation.

The EVP_PKEY_encrypt() function performs a public key encryption operation using ctx. The data to be encrypted is specified using the in and inlen parameters. If out is NULL then the maximum size of the output buffer is written to the outlen parameter. If out is not NULL then before the call the outlen parameter should contain the length of the out buffer, if the call is successful the encrypted data is written to out and the amount of data written to outlen.  

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.  

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.  

EXAMPLE

Encrypt data using OAEP (for RSA keys). See also PEM_read_PUBKEY(3) or 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 */

 

SEE ALSO

d2i_X509(3), engine(3), EVP_PKEY_CTX_new(3), EVP_PKEY_decrypt(3), EVP_PKEY_sign(3), EVP_PKEY_verify(3), EVP_PKEY_verify_recover(3), EVP_PKEY_derive(3)  

HISTORY

These functions were first added to OpenSSL 1.0.0.


 

Index

NAME
SYNOPSIS
DESCRIPTION
NOTES
RETURN VALUES
EXAMPLE
SEE ALSO
HISTORY





Support us on Content Nation
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2020 Sascha Nitsch Unternehmensberatung GmbH
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 19.2 ms