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author | Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org> | 2021-04-30 00:33:56 +0200 |
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committer | Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org> | 2021-04-30 00:33:56 +0200 |
commit | aa4d426b4d3527d7e166df1a05058c9a4a0f6683 (patch) | |
tree | 4ff17ce8b89a2321b9d0ed4bcfc37c447bcb6820 /openssl-1.1.0h/doc/crypto/RSA_private_encrypt.pod | |
download | smtps-and-pop3s-console-program-master.tar.gz smtps-and-pop3s-console-program-master.zip |
Diffstat (limited to 'openssl-1.1.0h/doc/crypto/RSA_private_encrypt.pod')
-rw-r--r-- | openssl-1.1.0h/doc/crypto/RSA_private_encrypt.pod | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/openssl-1.1.0h/doc/crypto/RSA_private_encrypt.pod b/openssl-1.1.0h/doc/crypto/RSA_private_encrypt.pod new file mode 100644 index 0000000..1eb7a0a --- /dev/null +++ b/openssl-1.1.0h/doc/crypto/RSA_private_encrypt.pod @@ -0,0 +1,74 @@ +=pod + +=head1 NAME + +RSA_private_encrypt, RSA_public_decrypt - low level signature operations + +=head1 SYNOPSIS + + #include <openssl/rsa.h> + + int RSA_private_encrypt(int flen, const unsigned char *from, + unsigned char *to, RSA *rsa, int padding); + + int RSA_public_decrypt(int flen, const unsigned char *from, + unsigned char *to, RSA *rsa, int padding); + +=head1 DESCRIPTION + +These functions handle RSA signatures at a low level. + +RSA_private_encrypt() signs the B<flen> bytes at B<from> (usually a +message digest with an algorithm identifier) using the private key +B<rsa> and stores the signature in B<to>. B<to> must point to +B<RSA_size(rsa)> bytes of memory. + +B<padding> denotes one of the following modes: + +=over 4 + +=item RSA_PKCS1_PADDING + +PKCS #1 v1.5 padding. This function does not handle the +B<algorithmIdentifier> specified in PKCS #1. When generating or +verifying PKCS #1 signatures, L<RSA_sign(3)> and L<RSA_verify(3)> should be +used. + +=item RSA_NO_PADDING + +Raw RSA signature. This mode should I<only> be used to implement +cryptographically sound padding modes in the application code. +Signing user data directly with RSA is insecure. + +=back + +RSA_public_decrypt() recovers the message digest from the B<flen> +bytes long signature at B<from> using the signer's public key +B<rsa>. B<to> must point to a memory section large enough to hold the +message digest (which is smaller than B<RSA_size(rsa) - +11>). B<padding> is the padding mode that was used to sign the data. + +=head1 RETURN VALUES + +RSA_private_encrypt() returns the size of the signature (i.e., +RSA_size(rsa)). RSA_public_decrypt() returns the size of the +recovered message digest. + +On error, -1 is returned; the error codes can be +obtained by L<ERR_get_error(3)>. + +=head1 SEE ALSO + +L<ERR_get_error(3)>, +L<RSA_sign(3)>, L<RSA_verify(3)> + +=head1 COPYRIGHT + +Copyright 2000-2016 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 |