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  man pages->NetBSD man pages -> RSA_public_encrypt (3)              



NAME    [Toc]    [Back]

       RSA_public_encrypt, RSA_private_decrypt - RSA public key

LIBRARY    [Toc]    [Back]

       libcrypto, -lcrypto

SYNOPSIS    [Toc]    [Back]

        #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);

DESCRIPTION    [Toc]    [Back]

       RSA_public_encrypt() encrypts the flen bytes at from (usually
 a session key) using the public key rsa and stores
       the ciphertext in to. to must point to RSA_size(rsa) bytes
       of memory.

       padding denotes one of the following modes:

           PKCS #1 v1.5 padding. This currently is the most
           widely used mode.

           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.

           PKCS #1 v1.5 padding with an SSL-specific modification
           that denotes that the server is SSL3 capable.

           Raw RSA encryption. This mode should only be used to
           implement cryptographically sound padding modes in the
           application code.  Encrypting user data directly with
           RSA is insecure.

       flen must be less than RSA_size(rsa) - 11 for the PKCS #1
       v1.5 based padding modes, and less than RSA_size(rsa) - 41
       for RSA_PKCS1_OAEP_PADDING. The random number generator
       must be seeded prior to calling RSA_public_encrypt().

       RSA_private_decrypt() decrypts the flen bytes at from
       using the private key rsa and stores the plaintext in to.
       to must point to a memory section large enough to hold the
       decrypted data (which is smaller than RSA_size(rsa)).
       padding is the padding mode that was used to encrypt the

RETURN VALUES    [Toc]    [Back]

       RSA_public_encrypt() returns the size of the encrypted
       data (i.e., RSA_size(rsa)). RSA_private_decrypt() returns
       the size of the recovered plaintext.

       On error, -1 is returned; the error codes can be obtained
       by ERR_get_error(3).

CONFORMING TO    [Toc]    [Back]

       SSL, PKCS #1 v2.0

SEE ALSO    [Toc]    [Back]

       openssl_err(3), openssl_rand(3), openssl_rsa(3),

NOTES    [Toc]    [Back]

       The RSA_PKCS1_RSAref(3) method supports only the
       RSA_PKCS1_PADDING mode.

HISTORY    [Toc]    [Back]

       The 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.

2001-04-12                    0.9.6g        RSA_public_encrypt(3)
[ Back ]
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