6859cf7459
manual when the specific function is refered to in the current manual text. This correction was originally introduced in OpenBSD's tracking of OpenSSL.
83 lines
2.3 KiB
Text
83 lines
2.3 KiB
Text
=pod
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=head1 NAME
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RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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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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int RSA_private_decrypt(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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=head1 DESCRIPTION
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RSA_public_encrypt() encrypts the B<flen> bytes at B<from> (usually a
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session key) using the public key B<rsa> and stores the ciphertext in
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B<to>. B<to> must point to RSA_size(B<rsa>) bytes of memory.
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B<padding> denotes one of the following modes:
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=over 4
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=item RSA_PKCS1_PADDING
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PKCS #1 v1.5 padding. This currently is the most widely used mode.
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=item RSA_PKCS1_OAEP_PADDING
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EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1 and an empty
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encoding parameter. This mode is recommended for all new applications.
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=item RSA_SSLV23_PADDING
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PKCS #1 v1.5 padding with an SSL-specific modification that denotes
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that the server is SSL3 capable.
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=item RSA_NO_PADDING
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Raw RSA encryption. This mode should I<only> 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 RSA is insecure.
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=back
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B<flen> must be less than RSA_size(B<rsa>) - 11 for the PKCS #1 v1.5
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based padding modes, and less than RSA_size(B<rsa>) - 41 for
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RSA_PKCS1_OAEP_PADDING. The random number generator must be seeded
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prior to calling RSA_public_encrypt().
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RSA_private_decrypt() decrypts the B<flen> bytes at B<from> using the
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private key B<rsa> and stores the plaintext in B<to>. B<to> 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(B<rsa>)). B<padding> is the padding mode that
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was used to encrypt the data.
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=head1 RETURN VALUES
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RSA_public_encrypt() returns the size of the encrypted data (i.e.,
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RSA_size(B<rsa>)). RSA_private_decrypt() returns the size of the
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recovered plaintext.
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On error, -1 is returned; the error codes can be
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obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
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=head1 CONFORMING TO
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SSL, PKCS #1 v2.0
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=head1 SEE ALSO
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L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>, L<rsa(3)|rsa(3)>,
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L<RSA_size(3)|RSA_size(3)>
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=head1 HISTORY
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The B<padding> argument was added in SSLeay 0.8. RSA_NO_PADDING is
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available since SSLeay 0.9.0, OAEP was added in OpenSSL 0.9.2b.
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=cut
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