Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28)

Standard preamble:
========================================================================
..

..

.. Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. \*(C+ will
give a nicer C++. Capital omega is used to do unbreakable dashes and
therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
nothing in troff, for use with C<>.
.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.

If the F register is turned on, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
entries marked with X<> in POD. Of course, you'll have to process the
output yourself in some meaningful fashion.

Avoid warning from groff about undefined register 'F'.
.. .nr rF 0 . if \nF \{ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{ . nr % 0 . nr F 2 . \} . \} .\} .rr rF
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ========================================================================

Title "RSA_private_encrypt 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
RSA_private_encrypt, RSA_public_decrypt - low level signature operations Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> \& int RSA_private_encrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa, int padding); \& int RSA_public_decrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa, int padding); .Ve Header "DESCRIPTION" These functions handle \s-1RSA\s0 signatures at a low level.

\fIRSA_private_encrypt() signs the flen bytes at from (usually a message digest with an algorithm identifier) using the private key \fBrsa and stores the signature in to. to must point to \fBRSA_size(rsa) bytes of memory.

\fBpadding denotes one of the following modes:

Item "RSA_PKCS1_PADDING" \s-1PKCS\s0 #1 v1.5 padding. This function does not handle the \fBalgorithmIdentifier specified in \s-1PKCS\s0 #1. When generating or verifying \s-1PKCS\s0 #1 signatures, RSA_sign\|(3) and RSA_verify\|(3) should be used. Item "RSA_NO_PADDING" Raw \s-1RSA\s0 signature. This mode should only be used to implement cryptographically sound padding modes in the application code. Signing user data directly with \s-1RSA\s0 is insecure.

\fIRSA_public_decrypt() recovers the message digest from the flen bytes long signature at from using the signer's public key \fBrsa. to must point to a memory section large enough to hold the message digest (which is smaller than RSA_size(rsa) - 11). padding is the padding mode that was used to sign the data.

Header "RETURN VALUES" \fIRSA_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 ERR_get_error\|(3).

Header "SEE ALSO" \fIERR_get_error\|(3), rsa\|(3), \fIRSA_sign\|(3), RSA_verify\|(3) Header "HISTORY" The padding argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is available since SSLeay 0.9.0.