df75c2bfcd
While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
110 lines
3.1 KiB
Text
110 lines
3.1 KiB
Text
=pod
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=head1 NAME
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EVP_PKEY_encrypt_init, EVP_PKEY_encrypt - encrypt using a public key algorithm
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx);
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int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
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unsigned char *out, size_t *outlen,
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const unsigned char *in, size_t inlen);
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=head1 DESCRIPTION
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The EVP_PKEY_encrypt_init() function initializes a public key algorithm
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context using key B<pkey> for an encryption operation.
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The EVP_PKEY_encrypt() function performs a public key encryption operation
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using B<ctx>. The data to be encrypted is specified using the B<in> and
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B<inlen> parameters. If B<out> is B<NULL> then the maximum size of the output
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buffer is written to the B<outlen> parameter. If B<out> is not B<NULL> then
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before the call the B<outlen> parameter should contain the length of the
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B<out> buffer, if the call is successful the encrypted data is written to
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B<out> and the amount of data written to B<outlen>.
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=head1 NOTES
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After the call to EVP_PKEY_encrypt_init() algorithm specific control
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operations can be performed to set any appropriate parameters for the
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operation.
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The function EVP_PKEY_encrypt() can be called more than once on the same
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context if several operations are performed using the same parameters.
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=head1 RETURN VALUES
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EVP_PKEY_encrypt_init() and EVP_PKEY_encrypt() return 1 for success and 0
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or a negative value for failure. In particular a return value of -2
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indicates the operation is not supported by the public key algorithm.
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=head1 EXAMPLE
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Encrypt data using OAEP (for RSA keys). See also L<PEM_read_PUBKEY(3)> or
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L<d2i_X509(3)> for means to load a public key. You may also simply
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set 'eng = NULL;' to start with the default OpenSSL RSA implementation:
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#include <openssl/evp.h>
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#include <openssl/rsa.h>
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#include <openssl/engine.h>
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EVP_PKEY_CTX *ctx;
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ENGINE *eng;
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unsigned char *out, *in;
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size_t outlen, inlen;
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EVP_PKEY *key;
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/*
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* NB: assumes eng, key, in, inlen are already set up,
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* and that key is an RSA public key
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*/
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ctx = EVP_PKEY_CTX_new(key, eng);
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if (!ctx)
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/* Error occurred */
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if (EVP_PKEY_encrypt_init(ctx) <= 0)
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/* Error */
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if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) <= 0)
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/* Error */
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/* Determine buffer length */
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if (EVP_PKEY_encrypt(ctx, NULL, &outlen, in, inlen) <= 0)
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/* Error */
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out = OPENSSL_malloc(outlen);
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if (!out)
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/* malloc failure */
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if (EVP_PKEY_encrypt(ctx, out, &outlen, in, inlen) <= 0)
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/* Error */
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/* Encrypted data is outlen bytes written to buffer out */
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=head1 SEE ALSO
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L<d2i_X509(3)>,
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L<ENGINE_by_id(3)>,
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_decrypt(3)>,
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L<EVP_PKEY_sign(3)>,
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L<EVP_PKEY_verify(3)>,
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L<EVP_PKEY_verify_recover(3)>,
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L<EVP_PKEY_derive(3)>
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=head1 HISTORY
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These functions were added in OpenSSL 1.0.0.
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=head1 COPYRIGHT
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Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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