172 lines
4.9 KiB
Groff
172 lines
4.9 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.35
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.\" ========================================================================
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.\"
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.IX Title "RSA_blinding_on 3"
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.TH RSA_blinding_on 3 "2007-03-15" "0.9.8e" "OpenSSL"
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.SH "NAME"
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RSA_blinding_on, RSA_blinding_off \- protect the RSA operation from timing attacks
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rsa.h>
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.Ve
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.PP
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.Vb 1
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\& int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
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.Ve
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.PP
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.Vb 1
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\& void RSA_blinding_off(RSA *rsa);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\s-1RSA\s0 is vulnerable to timing attacks. In a setup where attackers can
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measure the time of \s-1RSA\s0 decryption or signature operations, blinding
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must be used to protect the \s-1RSA\s0 operation from that attack.
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.PP
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\&\fIRSA_blinding_on()\fR turns blinding on for key \fBrsa\fR and generates a
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random blinding factor. \fBctx\fR is \fB\s-1NULL\s0\fR or a pre-allocated and
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initialized \fB\s-1BN_CTX\s0\fR. The random number generator must be seeded
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prior to calling \fIRSA_blinding_on()\fR.
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.PP
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\&\fIRSA_blinding_off()\fR turns blinding off and frees the memory used for
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the blinding factor.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRSA_blinding_on()\fR returns 1 on success, and 0 if an error occurred.
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.PP
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\&\fIRSA_blinding_off()\fR returns no value.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIrsa\fR\|(3), \fIrand\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIRSA_blinding_on()\fR and \fIRSA_blinding_off()\fR appeared in SSLeay 0.9.0.
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