RSA_padding_add_PKCS1_type_1OpenRSA_padding_add_PKCS1_type_1(3)





NAME
       RSA_padding_add_PKCS1_type_1, RSA_pad-
       ding_check_PKCS1_type_1, RSA_padding_add_PKCS1_type_2,
       RSA_padding_check_PKCS1_type_2, RSA_pad-
       ding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP,
       RSA_padding_add_SSLv23, RSA_padding_check_SSLv23,
       RSA_padding_add_none, RSA_padding_check_none - asymmet-
       ric encryption padding

SYNOPSIS
        #include <openssl/rsa.h>

        int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
           unsigned char *f, int fl);

        int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
           unsigned char *f, int fl, int rsa_len);

        int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
           unsigned char *f, int fl);

        int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
           unsigned char *f, int fl, int rsa_len);

        int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
           unsigned char *f, int fl, unsigned char *p, int pl);

        int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
           unsigned char *f, int fl, int rsa_len, unsigned char *p, int pl);

        int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
           unsigned char *f, int fl);

        int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
           unsigned char *f, int fl, int rsa_len);

        int RSA_padding_add_none(unsigned char *to, int tlen,
           unsigned char *f, int fl);

        int RSA_padding_check_none(unsigned char *to, int tlen,
           unsigned char *f, int fl, int rsa_len);

DESCRIPTION
       The RSA_padding_xxx_xxx() functions are called from the
       RSA encrypt, decrypt, sign and verify functions. Nor-
       mally they should not be called from application pro-
       grams.

       However, they can also be called directly to implement
       padding for other asymmetric ciphers. RSA_pad-
       ding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP()
       may be used in an application combined with RSA_NO_PAD-
       DING in order to implement OAEP with an encoding parame-
       ter.

       RSA_padding_add_xxx() encodes fl bytes from f so as to
       fit into tlen bytes and stores the result at to. An
       error occurs if fl does not meet the size requirements
       of the encoding method.

       The following encoding methods are implemented:

       PKCS1_type_1
           PKCS #1 v2.0 EMSA-PKCS1-v1_5 (PKCS #1 v1.5 block
           type 1); used for signatures

       PKCS1_type_2
           PKCS #1 v2.0 EME-PKCS1-v1_5 (PKCS #1 v1.5 block type
           2)

       PKCS1_OAEP
           PKCS #1 v2.0 EME-OAEP

       SSLv23
           PKCS #1 EME-PKCS1-v1_5 with SSL-specific modifica-
           tion

       none
           simply copy the data

       The random number generator must be seeded prior to
       calling RSA_padding_add_xxx().

       RSA_padding_check_xxx() verifies that the fl bytes at f
       contain a valid encoding for a rsa_len byte RSA key in
       the respective encoding method and stores the recovered
       data of at most tlen bytes (for RSA_NO_PADDING: of size
       tlen) at to.

       For RSA_padding_xxx_OAEP(), p points to the encoding
       parameter of length pl. p may be NULL if pl is 0.

RETURN VALUES
       The RSA_padding_add_xxx() functions return 1 on success,
       0 on error.  The RSA_padding_check_xxx() functions
       return the length of the recovered data, -1 on error.
       Error codes can be obtained by calling ERR_get_error(3).

SEE ALSO
       RSA_public_encrypt(3), RSA_private_decrypt(3),
       RSA_sign(3), RSA_verify(3)

HISTORY
       RSA_padding_add_PKCS1_type_1(), RSA_pad-
       ding_check_PKCS1_type_1(), RSA_pad-
       ding_add_PKCS1_type_2(), RSA_pad-
       ding_check_PKCS1_type_2(), RSA_padding_add_SSLv23(),
       RSA_padding_check_SSLv23(), RSA_padding_add_none() and
       RSA_padding_check_none() appeared in SSLeay 0.9.0.

       RSA_padding_add_PKCS1_OAEP() and RSA_pad-
       ding_check_PKCS1_OAEP() were added in OpenSSL 0.9.2b.



0.9.7c                     2000-RSA_padding_add_PKCS1_type_1(3)
