279 lines
7.1 KiB
Groff
279 lines
7.1 KiB
Groff
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.rn '' }`
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.de Sh
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.if t .Sp
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.ne 5
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..
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.de Sp
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.tm Index:\\$1\t\\n%\t"\\$2"
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..
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.nr % 0
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.rr F
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.\}
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.TH RSA_public_encrypt 3 "0.9.5a" "22/Jul/100" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.ft CW
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'if t \\&\\$1\c
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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. \" troff and (daisy-wheel) nroff accents
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. \" corrections for vroff
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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. ds : e
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. ds 8 ss
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. ds v \h'-1'\o'\(aa\(ga'
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. ds _ \h'-1'^
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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RSA_public_encrypt, RSA_private_decrypt \- RSA public key cryptography
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/rsa.h>
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.Ve
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.Vb 2
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\& int RSA_public_encrypt(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.Vb 2
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\& int RSA_private_decrypt(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.SH "DESCRIPTION"
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\fIRSA_public_encrypt()\fR encrypts the \fBflen\fR bytes at \fBfrom\fR (usually a
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session key) using the public key \fBrsa\fR and stores the ciphertext in
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\fBto\fR. \fBto\fR must point to \fIRSA_size\fR\|(\fBrsa\fR) bytes of memory.
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.PP
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\fBpadding\fR denotes one of the following modes:
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.Ip "\s-1RSA_PKCS1_PADDING\s0" 4
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\s-1PKCS\s0 #1 v1.5 padding. This currently is the most widely used mode.
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.Ip "\s-1RSA_PKCS1_OAEP_PADDING\s0" 4
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\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
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encoding parameter. This mode is recommended for all new applications.
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.Ip "\s-1RSA_SSLV23_PADDING\s0" 4
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\s-1PKCS\s0 #1 v1.5 padding with an \s-1SSL\s0\-specific modification that denotes
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that the server is \s-1SSL3\s0 capable.
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.Ip "\s-1RSA_NO_PADDING\s0" 4
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Raw \s-1RSA\s0 encryption. This mode should \fIonly\fR be used to implement
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cryptographically sound padding modes in the application code.
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Encrypting user data directly with \s-1RSA\s0 is insecure.
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.PP
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\fBflen\fR must be less than \fIRSA_size\fR\|(\fBrsa\fR) \- 11 for the \s-1PKCS\s0 #1 v1.5
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based padding modes, and less than \fIRSA_size\fR\|(\fBrsa\fR) \- 21 for
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\s-1RSA_PKCS1_OAEP_PADDING\s0. The random number generator must be seeded
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prior to calling \fIRSA_public_encrypt()\fR.
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.PP
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\fIRSA_private_decrypt()\fR decrypts the \fBflen\fR bytes at \fBfrom\fR using the
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private key \fBrsa\fR and stores the plaintext in \fBto\fR. \fBto\fR must point
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to a memory section large enough to hold the decrypted data (which is
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smaller than \fIRSA_size\fR\|(\fBrsa\fR)). \fBpadding\fR is the padding mode that
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was used to encrypt the data.
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.SH "RETURN VALUES"
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\fIRSA_public_encrypt()\fR returns the size of the encrypted data (i.e.,
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\fIRSA_size\fR\|(\fBrsa\fR)). \fIRSA_private_decrypt()\fR returns the size of the
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recovered plaintext.
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.PP
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On error, \-1 is returned; the error codes can be
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obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "CONFORMING TO"
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SSL, PKCS #1 v2.0
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.SH "SEE ALSO"
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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
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.SH "NOTES"
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The the \fIRSA_PKCS1_RSAref(3)|RSA_PKCS1_RSAref(3)\fR manpage method supports only the RSA_PKCS1_PADDING mode.
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.SH "HISTORY"
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The \fBpadding\fR argument was added in SSLeay 0.8. RSA_NO_PADDING is
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available since SSLeay 0.9.0, OAEP was added in OpenSSL 0.9.2b.
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.rn }` ''
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.IX Title "RSA_public_encrypt 3"
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.IX Name "RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Item "\s-1RSA_PKCS1_PADDING\s0"
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.IX Item "\s-1RSA_PKCS1_OAEP_PADDING\s0"
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.IX Item "\s-1RSA_SSLV23_PADDING\s0"
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.IX Item "\s-1RSA_NO_PADDING\s0"
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.IX Header "RETURN VALUES"
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.IX Header "CONFORMING TO"
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.IX Header "SEE ALSO"
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.IX Header "NOTES"
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.IX Header "HISTORY"
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