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+.\" ======================================================================
+.\"
+.IX Title "RSA_PRIVATE_ENCRYPT 1"
+.TH RSA_PRIVATE_ENCRYPT 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+RSA_private_encrypt, RSA_public_decrypt \- low level signature operations
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/rsa.h>
+.Ve
+.Vb 2
+\& int RSA_private_encrypt(int flen, unsigned char *from,
+\&    unsigned char *to, RSA *rsa, int padding);
+.Ve
+.Vb 2
+\& int RSA_public_decrypt(int flen, unsigned char *from, 
+\&    unsigned char *to, RSA *rsa, int padding);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+These functions handle \s-1RSA\s0 signatures at a low level.
+.PP
+\&\fIRSA_private_encrypt()\fR signs the \fBflen\fR bytes at \fBfrom\fR (usually a
+message digest with an algorithm identifier) using the private key
+\&\fBrsa\fR and stores the signature in \fBto\fR. \fBto\fR must point to
+\&\fBRSA_size(rsa)\fR bytes of memory.
+.PP
+\&\fBpadding\fR denotes one of the following modes:
+.Ip "\s-1RSA_PKCS1_PADDING\s0" 4
+.IX Item "RSA_PKCS1_PADDING"
+\&\s-1PKCS\s0 #1 v1.5 padding. This function does not handle the
+\&\fBalgorithmIdentifier\fR 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.
+.Ip "\s-1RSA_NO_PADDING\s0" 4
+.IX Item "RSA_NO_PADDING"
+Raw \s-1RSA\s0 signature. This mode should \fIonly\fR be used to implement
+cryptographically sound padding modes in the application code.
+Signing user data directly with \s-1RSA\s0 is insecure.
+.PP
+\&\fIRSA_public_decrypt()\fR recovers the message digest from the \fBflen\fR
+bytes long signature at \fBfrom\fR using the signer's public key
+\&\fBrsa\fR. \fBto\fR must point to a memory section large enough to hold the
+message digest (which is smaller than \fBRSA_size(rsa) \-
+11\fR). \fBpadding\fR is the padding mode that was used to sign the data.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIRSA_private_encrypt()\fR returns the size of the signature (i.e.,
+RSA_size(rsa)). \fIRSA_public_decrypt()\fR returns the size of the
+recovered message digest.
+.PP
+On error, \-1 is returned; the error codes can be
+obtained by ERR_get_error(3).
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+err(3), rsa(3), RSA_sign(3), RSA_verify(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+The \fBpadding\fR argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is
+available since SSLeay 0.9.0.