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140 .IX Title "RSA_PRIVATE_ENCRYPT 1"
141 .TH RSA_PRIVATE_ENCRYPT 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
144 RSA_private_encrypt, RSA_public_decrypt \- low level signature operations
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/rsa.h>
151 \& int RSA_private_encrypt(int flen, unsigned char *from,
152 \& unsigned char *to, RSA *rsa, int padding);
155 \& int RSA_public_decrypt(int flen, unsigned char *from,
156 \& unsigned char *to, RSA *rsa, int padding);
159 .IX Header "DESCRIPTION"
160 These functions handle \s-1RSA\s0 signatures at a low level.
162 \&\fIRSA_private_encrypt()\fR signs the \fBflen\fR bytes at \fBfrom\fR (usually a
163 message digest with an algorithm identifier) using the private key
164 \&\fBrsa\fR and stores the signature in \fBto\fR. \fBto\fR must point to
165 \&\fBRSA_size(rsa)\fR bytes of memory.
167 \&\fBpadding\fR denotes one of the following modes:
168 .Ip "\s-1RSA_PKCS1_PADDING\s0" 4
169 .IX Item "RSA_PKCS1_PADDING"
170 \&\s-1PKCS\s0 #1 v1.5 padding. This function does not handle the
171 \&\fBalgorithmIdentifier\fR specified in \s-1PKCS\s0 #1. When generating or
172 verifying \s-1PKCS\s0 #1 signatures, RSA_sign(3) and RSA_verify(3) should be
174 .Ip "\s-1RSA_NO_PADDING\s0" 4
175 .IX Item "RSA_NO_PADDING"
176 Raw \s-1RSA\s0 signature. This mode should \fIonly\fR be used to implement
177 cryptographically sound padding modes in the application code.
178 Signing user data directly with \s-1RSA\s0 is insecure.
180 \&\fIRSA_public_decrypt()\fR recovers the message digest from the \fBflen\fR
181 bytes long signature at \fBfrom\fR using the signer's public key
182 \&\fBrsa\fR. \fBto\fR must point to a memory section large enough to hold the
183 message digest (which is smaller than \fBRSA_size(rsa) \-
184 11\fR). \fBpadding\fR is the padding mode that was used to sign the data.
186 .IX Header "RETURN VALUES"
187 \&\fIRSA_private_encrypt()\fR returns the size of the signature (i.e.,
188 RSA_size(rsa)). \fIRSA_public_decrypt()\fR returns the size of the
189 recovered message digest.
191 On error, \-1 is returned; the error codes can be
192 obtained by ERR_get_error(3).
194 .IX Header "SEE ALSO"
195 err(3), rsa(3), RSA_sign(3), RSA_verify(3)
198 The \fBpadding\fR argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is
199 available since SSLeay 0.9.0.