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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
commitfc22b3d6507c6745911b9dfcc68f1e665ae13dbc (patch)
treece1e3bce06471410239a6f41282e328770aa404a /upstream/debian-unstable/man3/EVP_PKEY_decrypt.3ssl
parentInitial commit. (diff)
downloadmanpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.tar.xz
manpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.zip
Adding upstream version 4.22.0.upstream/4.22.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+. ds C` ""
+. ds C' ""
+'br\}
+.el\{\
+. ds C`
+. ds C'
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD. Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+. if \nF \{\
+. de IX
+. tm Index:\\$1\t\\n%\t"\\$2"
+..
+. if !\nF==2 \{\
+. nr % 0
+. nr F 2
+. \}
+. \}
+.\}
+.rr rF
+.\" ========================================================================
+.\"
+.IX Title "EVP_PKEY_DECRYPT 3SSL"
+.TH EVP_PKEY_DECRYPT 3SSL 2024-02-03 3.1.5 OpenSSL
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+EVP_PKEY_decrypt_init, EVP_PKEY_decrypt_init_ex,
+EVP_PKEY_decrypt \- decrypt using a public key algorithm
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/evp.h>
+\&
+\& int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
+\& int EVP_PKEY_decrypt_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);
+\& int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
+\& unsigned char *out, size_t *outlen,
+\& const unsigned char *in, size_t inlen);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+The \fBEVP_PKEY_decrypt_init()\fR function initializes a public key algorithm
+context using key \fIpkey\fR for a decryption operation.
+.PP
+The \fBEVP_PKEY_decrypt_init_ex()\fR function initializes a public key algorithm
+context using key \fIpkey\fR for a decryption operation and sets the
+algorithm specific \fIparams\fR.
+.PP
+The \fBEVP_PKEY_decrypt()\fR function performs a public key decryption operation
+using \fIctx\fR. The data to be decrypted is specified using the \fIin\fR and
+\&\fIinlen\fR parameters. If \fIout\fR is NULL then the minimum required size of
+the output buffer is written to the \fI*outlen\fR parameter.
+.PP
+If \fIout\fR is not NULL then before the call the \fI*outlen\fR parameter must
+contain the length of the \fIout\fR buffer. If the call is successful the
+decrypted data is written to \fIout\fR and the amount of the decrypted data
+written to \fI*outlen\fR, otherwise an error is returned.
+.SH NOTES
+.IX Header "NOTES"
+After the call to \fBEVP_PKEY_decrypt_init()\fR algorithm specific control
+operations can be performed to set any appropriate parameters for the
+operation. These operations can be included in the \fBEVP_PKEY_decrypt_init_ex()\fR
+call.
+.PP
+The function \fBEVP_PKEY_decrypt()\fR can be called more than once on the same
+context if several operations are performed using the same parameters.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBEVP_PKEY_decrypt_init()\fR, \fBEVP_PKEY_decrypt_init_ex()\fR and \fBEVP_PKEY_decrypt()\fR
+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.
+.SH EXAMPLES
+.IX Header "EXAMPLES"
+Decrypt data using OAEP (for RSA keys):
+.PP
+.Vb 2
+\& #include <openssl/evp.h>
+\& #include <openssl/rsa.h>
+\&
+\& EVP_PKEY_CTX *ctx;
+\& ENGINE *eng;
+\& unsigned char *out, *in;
+\& size_t outlen, inlen;
+\& EVP_PKEY *key;
+\&
+\& /*
+\& * NB: assumes key, eng, in, inlen are already set up
+\& * and that key is an RSA private key
+\& */
+\& ctx = EVP_PKEY_CTX_new(key, eng);
+\& if (!ctx)
+\& /* Error occurred */
+\& if (EVP_PKEY_decrypt_init(ctx) <= 0)
+\& /* Error */
+\& if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING) <= 0)
+\& /* Error */
+\&
+\& /* Determine buffer length */
+\& if (EVP_PKEY_decrypt(ctx, NULL, &outlen, in, inlen) <= 0)
+\& /* Error */
+\&
+\& out = OPENSSL_malloc(outlen);
+\&
+\& if (!out)
+\& /* malloc failure */
+\&
+\& if (EVP_PKEY_decrypt(ctx, out, &outlen, in, inlen) <= 0)
+\& /* Error */
+\&
+\& /* Decrypted data is outlen bytes written to buffer out */
+.Ve
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBEVP_PKEY_CTX_new\fR\|(3),
+\&\fBEVP_PKEY_encrypt\fR\|(3),
+\&\fBEVP_PKEY_sign\fR\|(3),
+\&\fBEVP_PKEY_verify\fR\|(3),
+\&\fBEVP_PKEY_verify_recover\fR\|(3),
+\&\fBEVP_PKEY_derive\fR\|(3)
+.SH HISTORY
+.IX Header "HISTORY"
+These functions were added in OpenSSL 1.0.0.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2006\-2022 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (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
+<https://www.openssl.org/source/license.html>.