NetBSD/lib/libcrypto/man/RSA_public_encrypt.3

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.TH RSA_public_encrypt 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
.UC
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.rm #[ #] #H #V #F C
.SH "NAME"
RSA_public_encrypt, RSA_private_decrypt \- RSA public key cryptography
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.PP
.Vb 1
\& #include <openssl/rsa.h>
.Ve
.Vb 2
\& int RSA_public_encrypt(int flen, unsigned char *from,
\&    unsigned char *to, RSA *rsa, int padding);
.Ve
.Vb 2
\& int RSA_private_decrypt(int flen, unsigned char *from,
\&     unsigned char *to, RSA *rsa, int padding);
.Ve
.SH "DESCRIPTION"
\fIRSA_public_encrypt()\fR encrypts the \fBflen\fR bytes at \fBfrom\fR (usually a
session key) using the public key \fBrsa\fR and stores the ciphertext in
\fBto\fR. \fBto\fR must point to \fIRSA_size\fR\|(\fBrsa\fR) bytes of memory.
.PP
\fBpadding\fR denotes one of the following modes:
.Ip "\s-1RSA_PKCS1_PADDING\s0" 4
\s-1PKCS\s0 #1 v1.5 padding. This currently is the most widely used mode.
.Ip "\s-1RSA_PKCS1_OAEP_PADDING\s0" 4
\s-1EME\s0\-\s-1OAEP\s0 as defined in \s-1PKCS\s0 #1 v2.0 with \s-1SHA\s0\-1, \s-1MGF1\s0 and an empty
encoding parameter. This mode is recommended for all new applications.
.Ip "\s-1RSA_SSLV23_PADDING\s0" 4
\s-1PKCS\s0 #1 v1.5 padding with an \s-1SSL\s0\-specific modification that denotes
that the server is \s-1SSL3\s0 capable.
.Ip "\s-1RSA_NO_PADDING\s0" 4
Raw \s-1RSA\s0 encryption. This mode should \fIonly\fR be used to implement
cryptographically sound padding modes in the application code.
Encrypting user data directly with \s-1RSA\s0 is insecure.
.PP
\fBflen\fR must be less than \fIRSA_size\fR\|(\fBrsa\fR) \- 11 for the \s-1PKCS\s0 #1 v1.5
based padding modes, and less than \fIRSA_size\fR\|(\fBrsa\fR) \- 21 for
\s-1RSA_PKCS1_OAEP_PADDING\s0. The random number generator must be seeded
prior to calling \fIRSA_public_encrypt()\fR.
.PP
\fIRSA_private_decrypt()\fR decrypts the \fBflen\fR bytes at \fBfrom\fR using the
private key \fBrsa\fR and stores the plaintext in \fBto\fR. \fBto\fR must point
to a memory section large enough to hold the decrypted data (which is
smaller than \fIRSA_size\fR\|(\fBrsa\fR)). \fBpadding\fR is the padding mode that
was used to encrypt the data.
.SH "RETURN VALUES"
\fIRSA_public_encrypt()\fR returns the size of the encrypted data (i.e.,
\fIRSA_size\fR\|(\fBrsa\fR)). \fIRSA_private_decrypt()\fR returns the size of the
recovered plaintext.
.PP
On error, \-1 is returned; the error codes can be
obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
.SH "CONFORMING TO"
SSL, PKCS #1 v2.0
.SH "SEE ALSO"
the \fIerr(3)|err(3)\fR manpage, the \fIrand(3)|rand(3)\fR manpage, the \fIrsa(3)|rsa(3)\fR manpage, the \fIRSA_size(3)|RSA_size(3)\fR manpage
.SH "NOTES"
The the \fIRSA_PKCS1_RSAref(3)|RSA_PKCS1_RSAref(3)\fR manpage method supports only the RSA_PKCS1_PADDING mode.
.SH "HISTORY"
The \fBpadding\fR argument was added in SSLeay 0.8. RSA_NO_PADDING is
available since SSLeay 0.9.0, OAEP was added in OpenSSL 0.9.2b.

.rn }` ''
.IX Title "RSA_public_encrypt 3"
.IX Name "RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography"

.IX Header "NAME"

.IX Header "SYNOPSIS"

.IX Header "DESCRIPTION"

.IX Item "\s-1RSA_PKCS1_PADDING\s0"

.IX Item "\s-1RSA_PKCS1_OAEP_PADDING\s0"

.IX Item "\s-1RSA_SSLV23_PADDING\s0"

.IX Item "\s-1RSA_NO_PADDING\s0"

.IX Header "RETURN VALUES"

.IX Header "CONFORMING TO"

.IX Header "SEE ALSO"

.IX Header "NOTES"

.IX Header "HISTORY"