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124 .\" ========================================================================
126 .IX Title "RSA_private_encrypt 3"
127 .TH RSA_private_encrypt 3 "2012-05-10" "1.0.1c" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 RSA_private_encrypt, RSA_public_decrypt \- low level signature operations
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/rsa.h>
139 \& int RSA_private_encrypt(int flen, unsigned char *from,
140 \& unsigned char *to, RSA *rsa, int padding);
142 \& int RSA_public_decrypt(int flen, unsigned char *from,
143 \& unsigned char *to, RSA *rsa, int padding);
146 .IX Header "DESCRIPTION"
147 These functions handle \s-1RSA\s0 signatures at a low level.
149 \&\fIRSA_private_encrypt()\fR signs the \fBflen\fR bytes at \fBfrom\fR (usually a
150 message digest with an algorithm identifier) using the private key
151 \&\fBrsa\fR and stores the signature in \fBto\fR. \fBto\fR must point to
152 \&\fBRSA_size(rsa)\fR bytes of memory.
154 \&\fBpadding\fR denotes one of the following modes:
155 .IP "\s-1RSA_PKCS1_PADDING\s0" 4
156 .IX Item "RSA_PKCS1_PADDING"
157 \&\s-1PKCS\s0 #1 v1.5 padding. This function does not handle the
158 \&\fBalgorithmIdentifier\fR specified in \s-1PKCS\s0 #1. When generating or
159 verifying \s-1PKCS\s0 #1 signatures, \fIRSA_sign\fR\|(3) and \fIRSA_verify\fR\|(3) should be
161 .IP "\s-1RSA_NO_PADDING\s0" 4
162 .IX Item "RSA_NO_PADDING"
163 Raw \s-1RSA\s0 signature. This mode should \fIonly\fR be used to implement
164 cryptographically sound padding modes in the application code.
165 Signing user data directly with \s-1RSA\s0 is insecure.
167 \&\fIRSA_public_decrypt()\fR recovers the message digest from the \fBflen\fR
168 bytes long signature at \fBfrom\fR using the signer's public key
169 \&\fBrsa\fR. \fBto\fR must point to a memory section large enough to hold the
170 message digest (which is smaller than \fBRSA_size(rsa) \-
171 11\fR). \fBpadding\fR is the padding mode that was used to sign the data.
173 .IX Header "RETURN VALUES"
174 \&\fIRSA_private_encrypt()\fR returns the size of the signature (i.e.,
175 RSA_size(rsa)). \fIRSA_public_decrypt()\fR returns the size of the
176 recovered message digest.
178 On error, \-1 is returned; the error codes can be
179 obtained by \fIERR_get_error\fR\|(3).
181 .IX Header "SEE ALSO"
182 \&\fIERR_get_error\fR\|(3), \fIrsa\fR\|(3),
183 \&\fIRSA_sign\fR\|(3), \fIRSA_verify\fR\|(3)
186 The \fBpadding\fR argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is
187 available since SSLeay 0.9.0.