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134 .IX Title "RSA_blinding_on 3"
135 .TH RSA_blinding_on 3 "2009-04-11" "0.9.8k" "OpenSSL"
136 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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141 RSA_blinding_on, RSA_blinding_off \- protect the RSA operation from timing attacks
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/rsa.h>
147 \& int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
149 \& void RSA_blinding_off(RSA *rsa);
152 .IX Header "DESCRIPTION"
153 \&\s-1RSA\s0 is vulnerable to timing attacks. In a setup where attackers can
154 measure the time of \s-1RSA\s0 decryption or signature operations, blinding
155 must be used to protect the \s-1RSA\s0 operation from that attack.
157 \&\fIRSA_blinding_on()\fR turns blinding on for key \fBrsa\fR and generates a
158 random blinding factor. \fBctx\fR is \fB\s-1NULL\s0\fR or a pre-allocated and
159 initialized \fB\s-1BN_CTX\s0\fR. The random number generator must be seeded
160 prior to calling \fIRSA_blinding_on()\fR.
162 \&\fIRSA_blinding_off()\fR turns blinding off and frees the memory used for
165 .IX Header "RETURN VALUES"
166 \&\fIRSA_blinding_on()\fR returns 1 on success, and 0 if an error occurred.
168 \&\fIRSA_blinding_off()\fR returns no value.
170 .IX Header "SEE ALSO"
171 \&\fIrsa\fR\|(3), \fIrand\fR\|(3)
174 \&\fIRSA_blinding_on()\fR and \fIRSA_blinding_off()\fR appeared in SSLeay 0.9.0.