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3dbf824380
There was recently an instance where a user was confused by the deprecation warnings in the docs. They believed the warning applied to the immediately preceding function declarations, when it fact it applied to the following function declarations. https://mta.openssl.org/pipermail/openssl-users/2021-December/014665.html We clarify the wording to make it clear that the warning applies to the following functions. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17180)
89 lines
2.6 KiB
Plaintext
89 lines
2.6 KiB
Plaintext
=pod
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=head1 NAME
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RSA_private_encrypt, RSA_public_decrypt - low-level signature operations
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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int RSA_private_encrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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int RSA_public_decrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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=head1 DESCRIPTION
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Both of the functions described on this page are deprecated.
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Applications should instead use L<EVP_PKEY_sign_init_ex(3)>,
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L<EVP_PKEY_sign(3)>, L<EVP_PKEY_verify_recover_init(3)>, and
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L<EVP_PKEY_verify_recover(3)>.
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These functions handle RSA signatures at a low-level.
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RSA_private_encrypt() signs the B<flen> bytes at B<from> (usually a
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message digest with an algorithm identifier) using the private key
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B<rsa> and stores the signature in B<to>. B<to> must point to
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B<RSA_size(rsa)> bytes of memory.
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B<padding> denotes one of the following modes:
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=over 4
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=item RSA_PKCS1_PADDING
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PKCS #1 v1.5 padding. This function does not handle the
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B<algorithmIdentifier> specified in PKCS #1. When generating or
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verifying PKCS #1 signatures, L<RSA_sign(3)> and L<RSA_verify(3)> should be
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used.
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=item RSA_NO_PADDING
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Raw RSA signature. This mode should I<only> be used to implement
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cryptographically sound padding modes in the application code.
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Signing user data directly with RSA is insecure.
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=back
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RSA_public_decrypt() recovers the message digest from the B<flen>
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bytes long signature at B<from> using the signer's public key
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B<rsa>. B<to> must point to a memory section large enough to hold the
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message digest (which is smaller than B<RSA_size(rsa) -
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11>). B<padding> is the padding mode that was used to sign the data.
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=head1 RETURN VALUES
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RSA_private_encrypt() returns the size of the signature (i.e.,
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RSA_size(rsa)). RSA_public_decrypt() returns the size of the
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recovered message digest.
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On error, -1 is returned; the error codes can be
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obtained by L<ERR_get_error(3)>.
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=head1 SEE ALSO
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L<ERR_get_error(3)>,
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L<RSA_sign(3)>, L<RSA_verify(3)>,
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L<EVP_PKEY_sign(3)>, L<EVP_PKEY_verify_recover(3)>
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=head1 HISTORY
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Both of these functions were deprecated in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (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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