205 lines
6.1 KiB
Groff
205 lines
6.1 KiB
Groff
.\" $NetBSD: RSA_private_encrypt.3,v 1.12 2003/07/24 14:16:42 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "RSA_private_encrypt 3"
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.TH RSA_private_encrypt 3 "0.9.7b" "2002-09-25" "OpenSSL"
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.UC
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.SH "NAME"
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RSA_private_encrypt, RSA_public_decrypt \- low level signature operations
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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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.Vb 2
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\& int RSA_private_encrypt(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.Vb 2
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\& int RSA_public_decrypt(int flen, unsigned char *from,
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\& unsigned char *to, RSA *rsa, int padding);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions handle \s-1RSA\s0 signatures at a low level.
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.PP
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\&\fIRSA_private_encrypt()\fR signs the \fBflen\fR bytes at \fBfrom\fR (usually a
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message digest with an algorithm identifier) using the private key
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\&\fBrsa\fR and stores the signature in \fBto\fR. \fBto\fR must point to
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\&\fBRSA_size(rsa)\fR bytes of memory.
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.PP
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\&\fBpadding\fR denotes one of the following modes:
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.Ip "\s-1RSA_PKCS1_PADDING\s0" 4
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.IX Item "RSA_PKCS1_PADDING"
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\&\s-1PKCS\s0 #1 v1.5 padding. This function does not handle the
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\&\fBalgorithmIdentifier\fR specified in \s-1PKCS\s0 #1. When generating or
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verifying \s-1PKCS\s0 #1 signatures, RSA_sign(3) and RSA_verify(3) should be
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used.
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.Ip "\s-1RSA_NO_PADDING\s0" 4
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.IX Item "RSA_NO_PADDING"
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Raw \s-1RSA\s0 signature. This mode should \fIonly\fR be used to implement
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cryptographically sound padding modes in the application code.
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Signing user data directly with \s-1RSA\s0 is insecure.
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.PP
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\&\fIRSA_public_decrypt()\fR recovers the message digest from the \fBflen\fR
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bytes long signature at \fBfrom\fR using the signer's public key
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\&\fBrsa\fR. \fBto\fR must point to a memory section large enough to hold the
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message digest (which is smaller than \fBRSA_size(rsa) \-
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11\fR). \fBpadding\fR is the padding mode that was used to sign the data.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRSA_private_encrypt()\fR returns the size of the signature (i.e.,
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RSA_size(rsa)). \fIRSA_public_decrypt()\fR returns the size of the
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recovered message digest.
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.PP
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On error, \-1 is returned; the error codes can be
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obtained by ERR_get_error(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ERR_get_error(3), openssl_rsa(3),
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RSA_sign(3), RSA_verify(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fBpadding\fR argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is
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available since SSLeay 0.9.0.
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