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a528d4f0a9
If something was "present in all versions" of SSLeay, or if it was added to a version of SSLeay (and therefore predates OpenSSL), remove mention of it. Documentation history now starts with OpenSSL. Remove mention of all history before OpenSSL 0.9.8, inclusive. Remove all AUTHOR sections. Reviewed-by: Tim Hudson <tjh@openssl.org>
80 lines
2.1 KiB
Plaintext
80 lines
2.1 KiB
Plaintext
=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, less than RSA_size(B<rsa>) - 41 for
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RSA_PKCS1_OAEP_PADDING and exactly RSA_size(B<rsa>) for RSA_NO_PADDING.
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The random number generator must be seeded prior to calling
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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)>.
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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)>, L<rand(3)>, L<rsa(3)>,
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L<RSA_size(3)>
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=cut
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