f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
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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.\" Thu Jul 24 13:08:01 2003
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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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