You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.3 KiB
84 lines
2.3 KiB
=pod |
|
|
|
=head1 NAME |
|
|
|
RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography |
|
|
|
=head1 SYNOPSIS |
|
|
|
#include <openssl/rsa.h> |
|
|
|
int RSA_public_encrypt(int flen, unsigned char *from, |
|
unsigned char *to, RSA *rsa, int padding); |
|
|
|
int RSA_private_decrypt(int flen, unsigned char *from, |
|
unsigned char *to, RSA *rsa, int padding); |
|
|
|
=head1 DESCRIPTION |
|
|
|
RSA_public_encrypt() encrypts the B<flen> bytes at B<from> (usually a |
|
session key) using the public key B<rsa> and stores the ciphertext in |
|
B<to>. B<to> must point to RSA_size(B<rsa>) bytes of memory. |
|
|
|
B<padding> denotes one of the following modes: |
|
|
|
=over 4 |
|
|
|
=item RSA_PKCS1_PADDING |
|
|
|
PKCS #1 v1.5 padding. This currently is the most widely used mode. |
|
|
|
=item RSA_PKCS1_OAEP_PADDING |
|
|
|
EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1 and an empty |
|
encoding parameter. This mode is recommended for all new applications. |
|
|
|
=item RSA_SSLV23_PADDING |
|
|
|
PKCS #1 v1.5 padding with an SSL-specific modification that denotes |
|
that the server is SSL3 capable. |
|
|
|
=item RSA_NO_PADDING |
|
|
|
Raw RSA encryption. This mode should I<only> be used to implement |
|
cryptographically sound padding modes in the application code. |
|
Encrypting user data directly with RSA is insecure. |
|
|
|
=back |
|
|
|
B<flen> must be less than RSA_size(B<rsa>) - 11 for the PKCS #1 v1.5 |
|
based padding modes, less than RSA_size(B<rsa>) - 41 for |
|
RSA_PKCS1_OAEP_PADDING and exactly RSA_size(B<rsa>) for RSA_NO_PADDING. |
|
The random number generator must be seeded prior to calling |
|
RSA_public_encrypt(). |
|
|
|
RSA_private_decrypt() decrypts the B<flen> bytes at B<from> using the |
|
private key B<rsa> and stores the plaintext in B<to>. B<to> must point |
|
to a memory section large enough to hold the decrypted data (which is |
|
smaller than RSA_size(B<rsa>)). B<padding> is the padding mode that |
|
was used to encrypt the data. |
|
|
|
=head1 RETURN VALUES |
|
|
|
RSA_public_encrypt() returns the size of the encrypted data (i.e., |
|
RSA_size(B<rsa>)). RSA_private_decrypt() returns the size of the |
|
recovered plaintext. |
|
|
|
On error, -1 is returned; the error codes can be |
|
obtained by L<ERR_get_error(3)|ERR_get_error(3)>. |
|
|
|
=head1 CONFORMING TO |
|
|
|
SSL, PKCS #1 v2.0 |
|
|
|
=head1 SEE ALSO |
|
|
|
L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>, L<rsa(3)|rsa(3)>, |
|
L<RSA_size(3)|RSA_size(3)> |
|
|
|
=head1 HISTORY |
|
|
|
The B<padding> argument was added in SSLeay 0.8. RSA_NO_PADDING is |
|
available since SSLeay 0.9.0, OAEP was added in OpenSSL 0.9.2b. |
|
|
|
=cut
|
|
|