Merge from vendor branch OPENSSL:
[dragonfly.git] / secure / lib / libcrypto / man / RSA_blinding_on.3
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124.\" ========================================================================
125.\"
126.IX Title "RSA_blinding_on 3"
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127.TH RSA_blinding_on 3 "2007-10-24" "0.9.8g" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
984263bc 132.SH "NAME"
74dab6c2 133RSA_blinding_on, RSA_blinding_off \- protect the RSA operation from timing attacks
984263bc 134.SH "SYNOPSIS"
8b0cefbb 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/rsa.h>
2eaa1526 138\&
984263bc 139\& int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
2eaa1526 140\&
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141\& void RSA_blinding_off(RSA *rsa);
142.Ve
143.SH "DESCRIPTION"
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144.IX Header "DESCRIPTION"
145\&\s-1RSA\s0 is vulnerable to timing attacks. In a setup where attackers can
146measure the time of \s-1RSA\s0 decryption or signature operations, blinding
147must be used to protect the \s-1RSA\s0 operation from that attack.
984263bc 148.PP
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149\&\fIRSA_blinding_on()\fR turns blinding on for key \fBrsa\fR and generates a
150random blinding factor. \fBctx\fR is \fB\s-1NULL\s0\fR or a pre-allocated and
151initialized \fB\s-1BN_CTX\s0\fR. The random number generator must be seeded
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152prior to calling \fIRSA_blinding_on()\fR.
153.PP
8b0cefbb 154\&\fIRSA_blinding_off()\fR turns blinding off and frees the memory used for
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155the blinding factor.
156.SH "RETURN VALUES"
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157.IX Header "RETURN VALUES"
158\&\fIRSA_blinding_on()\fR returns 1 on success, and 0 if an error occurred.
984263bc 159.PP
8b0cefbb 160\&\fIRSA_blinding_off()\fR returns no value.
984263bc 161.SH "SEE ALSO"
74dab6c2 162.IX Header "SEE ALSO"
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163\&\fIrsa\fR\|(3), \fIrand\fR\|(3)
164.SH "HISTORY"
984263bc 165.IX Header "HISTORY"
8b0cefbb 166\&\fIRSA_blinding_on()\fR and \fIRSA_blinding_off()\fR appeared in SSLeay 0.9.0.