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-=pod
-
-=head1 NAME
-
-RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1,
-RSA_padding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2,
-RSA_padding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP,
-RSA_padding_add_SSLv23, RSA_padding_check_SSLv23,
-RSA_padding_add_none, RSA_padding_check_none - asymmetric encryption
-padding
-
-=head1 SYNOPSIS
-
- #include <openssl/rsa.h>
-
- int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
- unsigned char *f, int fl);
-
- int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
- unsigned char *f, int fl, int rsa_len);
-
- int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
- unsigned char *f, int fl);
-
- int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
- unsigned char *f, int fl, int rsa_len);
-
- int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
- unsigned char *f, int fl, unsigned char *p, int pl);
-
- int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
- unsigned char *f, int fl, int rsa_len, unsigned char *p, int pl);
-
- int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
- unsigned char *f, int fl);
-
- int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
- unsigned char *f, int fl, int rsa_len);
-
- int RSA_padding_add_none(unsigned char *to, int tlen,
- unsigned char *f, int fl);
-
- int RSA_padding_check_none(unsigned char *to, int tlen,
- unsigned char *f, int fl, int rsa_len);
-
-=head1 DESCRIPTION
-
-The RSA_padding_xxx_xxx() functions are called from the RSA encrypt,
-decrypt, sign and verify functions. Normally they should not be called
-from application programs.
-
-However, they can also be called directly to implement padding for other
-asymmetric ciphers. RSA_padding_add_PKCS1_OAEP() and
-RSA_padding_check_PKCS1_OAEP() may be used in an application combined
-with B<RSA_NO_PADDING> in order to implement OAEP with an encoding
-parameter.
-
-RSA_padding_add_xxx() encodes B<fl> bytes from B<f> so as to fit into
-B<tlen> bytes and stores the result at B<to>. An error occurs if B<fl>
-does not meet the size requirements of the encoding method.
-
-The following encoding methods are implemented:
-
-=over 4
-
-=item PKCS1_type_1
-
-PKCS #1 v2.0 EMSA-PKCS1-v1_5 (PKCS #1 v1.5 block type 1); used for signatures
-
-=item PKCS1_type_2
-
-PKCS #1 v2.0 EME-PKCS1-v1_5 (PKCS #1 v1.5 block type 2)
-
-=item PKCS1_OAEP
-
-PKCS #1 v2.0 EME-OAEP
-
-=item SSLv23
-
-PKCS #1 EME-PKCS1-v1_5 with SSL-specific modification
-
-=item none
-
-simply copy the data
-
-=back
-
-The random number generator must be seeded prior to calling
-RSA_padding_add_xxx().
-
-RSA_padding_check_xxx() verifies that the B<fl> bytes at B<f> contain
-a valid encoding for a B<rsa_len> byte RSA key in the respective
-encoding method and stores the recovered data of at most B<tlen> bytes
-(for B<RSA_NO_PADDING>: of size B<tlen>)
-at B<to>.
-
-For RSA_padding_xxx_OAEP(), B<p> points to the encoding parameter
-of length B<pl>. B<p> may be B<NULL> if B<pl> is 0.
-
-=head1 RETURN VALUES
-
-The RSA_padding_add_xxx() functions return 1 on success, 0 on error.
-The RSA_padding_check_xxx() functions return the length of the
-recovered data, -1 on error. Error codes can be obtained by calling
-L<ERR_get_error(3)|ERR_get_error(3)>.
-
-=head1 WARNING
-
-The RSA_padding_check_PKCS1_type_2() padding check leaks timing
-information which can potentially be used to mount a Bleichenbacher
-padding oracle attack. This is an inherent weakness in the PKCS #1
-v1.5 padding design. Prefer PKCS1_OAEP padding.
-
-=head1 SEE ALSO
-
-L<RSA_public_encrypt(3)|RSA_public_encrypt(3)>,
-L<RSA_private_decrypt(3)|RSA_private_decrypt(3)>,
-L<RSA_sign(3)|RSA_sign(3)>, L<RSA_verify(3)|RSA_verify(3)>
-
-=head1 HISTORY
-
-RSA_padding_add_PKCS1_type_1(), RSA_padding_check_PKCS1_type_1(),
-RSA_padding_add_PKCS1_type_2(), RSA_padding_check_PKCS1_type_2(),
-RSA_padding_add_SSLv23(), RSA_padding_check_SSLv23(),
-RSA_padding_add_none() and RSA_padding_check_none() appeared in
-SSLeay 0.9.0.
-
-RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() were
-added in OpenSSL 0.9.2b.
-
-=cut