From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 .../doc/crypto/EVP_PKEY_verify_recover.pod         | 112 +++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 openssl-1.1.0h/doc/crypto/EVP_PKEY_verify_recover.pod

(limited to 'openssl-1.1.0h/doc/crypto/EVP_PKEY_verify_recover.pod')

diff --git a/openssl-1.1.0h/doc/crypto/EVP_PKEY_verify_recover.pod b/openssl-1.1.0h/doc/crypto/EVP_PKEY_verify_recover.pod
new file mode 100644
index 0000000..837bc64
--- /dev/null
+++ b/openssl-1.1.0h/doc/crypto/EVP_PKEY_verify_recover.pod
@@ -0,0 +1,112 @@
+=pod
+
+=head1 NAME
+
+EVP_PKEY_verify_recover_init, EVP_PKEY_verify_recover - recover signature using a public key algorithm
+
+=head1 SYNOPSIS
+
+ #include <openssl/evp.h>
+
+ int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx);
+ int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,
+                        unsigned char *rout, size_t *routlen,
+                        const unsigned char *sig, size_t siglen);
+
+=head1 DESCRIPTION
+
+The EVP_PKEY_verify_recover_init() function initializes a public key algorithm
+context using key B<pkey> for a verify recover operation.
+
+The EVP_PKEY_verify_recover() function recovers signed data
+using B<ctx>. The signature is specified using the B<sig> and
+B<siglen> parameters. If B<rout> is B<NULL> then the maximum size of the output
+buffer is written to the B<routlen> parameter. If B<rout> is not B<NULL> then
+before the call the B<routlen> parameter should contain the length of the
+B<rout> buffer, if the call is successful recovered data is written to
+B<rout> and the amount of data written to B<routlen>.
+
+=head1 NOTES
+
+Normally an application is only interested in whether a signature verification
+operation is successful in those cases the EVP_verify() function should be
+used.
+
+Sometimes however it is useful to obtain the data originally signed using a
+signing operation. Only certain public key algorithms can recover a signature
+in this way (for example RSA in PKCS padding mode).
+
+After the call to EVP_PKEY_verify_recover_init() algorithm specific control
+operations can be performed to set any appropriate parameters for the
+operation.
+
+The function EVP_PKEY_verify_recover() can be called more than once on the same
+context if several operations are performed using the same parameters.
+
+=head1 RETURN VALUES
+
+EVP_PKEY_verify_recover_init() and EVP_PKEY_verify_recover() 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.
+
+=head1 EXAMPLE
+
+Recover digest originally signed using PKCS#1 and SHA256 digest:
+
+ #include <openssl/evp.h>
+ #include <openssl/rsa.h>
+
+ EVP_PKEY_CTX *ctx;
+ unsigned char *rout, *sig;
+ size_t routlen, siglen;
+ EVP_PKEY *verify_key;
+ /* NB: assumes verify_key, sig and siglen are already set up
+  * and that verify_key is an RSA public key
+  */
+ ctx = EVP_PKEY_CTX_new(verify_key);
+ if (!ctx)
+        /* Error occurred */
+ if (EVP_PKEY_verify_recover_init(ctx) <= 0)
+        /* Error */
+ if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
+        /* Error */
+ if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
+        /* Error */
+
+ /* Determine buffer length */
+ if (EVP_PKEY_verify_recover(ctx, NULL, &routlen, sig, siglen) <= 0)
+        /* Error */
+
+ rout = OPENSSL_malloc(routlen);
+
+ if (!rout)
+        /* malloc failure */
+
+ if (EVP_PKEY_verify_recover(ctx, rout, &routlen, sig, siglen) <= 0)
+        /* Error */
+
+ /* Recovered data is routlen bytes written to buffer rout */
+
+=head1 SEE ALSO
+
+L<EVP_PKEY_CTX_new(3)>,
+L<EVP_PKEY_encrypt(3)>,
+L<EVP_PKEY_decrypt(3)>,
+L<EVP_PKEY_sign(3)>,
+L<EVP_PKEY_verify(3)>,
+L<EVP_PKEY_derive(3)>
+
+=head1 HISTORY
+
+These functions were first added to OpenSSL 1.0.0.
+
+=head1 COPYRIGHT
+
+Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (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
+L<https://www.openssl.org/source/license.html>.
+
+=cut
-- 
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