217 lines
6.7 KiB
Groff
217 lines
6.7 KiB
Groff
.\" $NetBSD: RSA_public_encrypt.3,v 1.5 2001/04/12 10:45:38 itojun Exp $
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.\" Thu Apr 12 19:27:07 2001
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.\" ======================================================================
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.\"
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.IX Title "RSA_public_encrypt 3"
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.TH RSA_public_encrypt 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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RSA_public_encrypt, RSA_private_decrypt \- \s-1RSA\s0 public key cryptography
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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_public_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_private_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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\&\fIRSA_public_encrypt()\fR encrypts the \fBflen\fR bytes at \fBfrom\fR (usually a
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session key) using the public key \fBrsa\fR and stores the ciphertext in
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\&\fBto\fR. \fBto\fR must point to RSA_size(\fBrsa\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 currently is the most widely used mode.
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.Ip "\s-1RSA_PKCS1_OAEP_PADDING\s0" 4
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.IX Item "RSA_PKCS1_OAEP_PADDING"
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\&\s-1EME-OAEP\s0 as defined in \s-1PKCS\s0 #1 v2.0 with \s-1SHA-1\s0, \s-1MGF1\s0 and an empty
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encoding parameter. This mode is recommended for all new applications.
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.Ip "\s-1RSA_SSLV23_PADDING\s0" 4
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.IX Item "RSA_SSLV23_PADDING"
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\&\s-1PKCS\s0 #1 v1.5 padding with an SSL-specific modification that denotes
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that the server is \s-1SSL3\s0 capable.
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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 encryption. 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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Encrypting user data directly with \s-1RSA\s0 is insecure.
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.PP
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\&\fBflen\fR must be less than RSA_size(\fBrsa\fR) \- 11 for the \s-1PKCS\s0 #1 v1.5
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based padding modes, and less than RSA_size(\fBrsa\fR) \- 41 for
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\&\s-1RSA_PKCS1_OAEP_PADDING\s0. The random number generator must be seeded
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prior to calling \fIRSA_public_encrypt()\fR.
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.PP
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\&\fIRSA_private_decrypt()\fR decrypts the \fBflen\fR bytes at \fBfrom\fR using the
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private key \fBrsa\fR and stores the plaintext in \fBto\fR. \fBto\fR must point
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to a memory section large enough to hold the decrypted data (which is
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smaller than RSA_size(\fBrsa\fR)). \fBpadding\fR is the padding mode that
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was used to encrypt the data.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRSA_public_encrypt()\fR returns the size of the encrypted data (i.e.,
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RSA_size(\fBrsa\fR)). \fIRSA_private_decrypt()\fR returns the size of the
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recovered plaintext.
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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 "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1SSL\s0, \s-1PKCS\s0 #1 v2.0
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_err(3), openssl_rand(3), openssl_rsa(3), RSA_size(3)
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.SH "NOTES"
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.IX Header "NOTES"
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The RSA_PKCS1_RSAref(3) method supports only the \s-1RSA_PKCS1_PADDING\s0 mode.
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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, \s-1OAEP\s0 was added in OpenSSL 0.9.2b.
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