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Filename : RSA_padding_check_PKCS1_OAEP.3
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.\" ========================================================================
.\"
.IX Title "RSA_padding_add_PKCS1_type_1 3"
.TH RSA_padding_add_PKCS1_type_1 3 "2016-09-22" "1.0.1u" "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"
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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBRSA_padding_xxx_xxx()\fR functions are called from the \s-1RSA\s0 encrypt,
decrypt, sign and verify functions. Normally they should not be called
from application programs.
.PP
However, they can also be called directly to implement padding for other
asymmetric ciphers. \fBRSA_padding_add_PKCS1_OAEP()\fR and
\&\fBRSA_padding_check_PKCS1_OAEP()\fR may be used in an application combined
with \fB\s-1RSA_NO_PADDING\s0\fR in order to implement \s-1OAEP\s0 with an encoding
parameter.
.PP
\&\fBRSA_padding_add_xxx()\fR encodes \fBfl\fR bytes from \fBf\fR so as to fit into
\&\fBtlen\fR bytes and stores the result at \fBto\fR. An error occurs if \fBfl\fR
does not meet the size requirements of the encoding method.
.PP
The following encoding methods are implemented:
.IP "PKCS1_type_1" 4
.IX Item "PKCS1_type_1"
\&\s-1PKCS\s0 #1 v2.0 EMSA\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 1); used for signatures
.IP "PKCS1_type_2" 4
.IX Item "PKCS1_type_2"
\&\s-1PKCS\s0 #1 v2.0 EME\-PKCS1\-v1_5 (\s-1PKCS\s0 #1 v1.5 block type 2)
.IP "\s-1PKCS1_OAEP\s0" 4
.IX Item "PKCS1_OAEP"
\&\s-1PKCS\s0 #1 v2.0 EME-OAEP
.IP "SSLv23" 4
.IX Item "SSLv23"
\&\s-1PKCS\s0 #1 EME\-PKCS1\-v1_5 with SSL-specific modification
.IP "none" 4
.IX Item "none"
simply copy the data
.PP
The random number generator must be seeded prior to calling
\&\fBRSA_padding_add_xxx()\fR.
.PP
\&\fBRSA_padding_check_xxx()\fR verifies that the \fBfl\fR bytes at \fBf\fR contain
a valid encoding for a \fBrsa_len\fR byte \s-1RSA\s0 key in the respective
encoding method and stores the recovered data of at most \fBtlen\fR bytes
(for \fB\s-1RSA_NO_PADDING\s0\fR: of size \fBtlen\fR)
at \fBto\fR.
.PP
For \fBRSA_padding_xxx_OAEP()\fR, \fBp\fR points to the encoding parameter
of length \fBpl\fR. \fBp\fR may be \fB\s-1NULL\s0\fR if \fBpl\fR is 0.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The \fBRSA_padding_add_xxx()\fR functions return 1 on success, 0 on error.
The \fBRSA_padding_check_xxx()\fR functions return the length of the
recovered data, \-1 on error. Error codes can be obtained by calling
\&\fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBRSA_public_encrypt\fR\|(3),
\&\fBRSA_private_decrypt\fR\|(3),
\&\fBRSA_sign\fR\|(3), \fBRSA_verify\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBRSA_padding_add_PKCS1_type_1()\fR, \fBRSA_padding_check_PKCS1_type_1()\fR,
\&\fBRSA_padding_add_PKCS1_type_2()\fR, \fBRSA_padding_check_PKCS1_type_2()\fR,
\&\fBRSA_padding_add_SSLv23()\fR, \fBRSA_padding_check_SSLv23()\fR,
\&\fBRSA_padding_add_none()\fR and \fBRSA_padding_check_none()\fR appeared in
SSLeay 0.9.0.
.PP
\&\fBRSA_padding_add_PKCS1_OAEP()\fR and \fBRSA_padding_check_PKCS1_OAEP()\fR were
added in OpenSSL 0.9.2b.