RSA_padding_add_PKCS1_type_1(3)RSA_padding_add_PKCS1_type_1(3)NAME
RSA_padding_add_PKCS1_type_1, RSA_padding_check_PKCS1_type_1, RSA_pad‐
ding_add_PKCS1_type_2, RSA_padding_check_PKCS1_type_2, RSA_pad‐
ding_add_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP, RSA_pad‐
ding_add_SSLv23, RSA_padding_check_SSLv23, RSA_padding_add_none,
RSA_padding_check_none - Asymmetric 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. Normally they should not be called
from application programs.
However, they can also be called directly to implement padding for
other asymmetric ciphers. The RSA_padding_add_PKCS1_OAEP() and RSA_pad‐
ding_check_PKCS1_OAEP() function can be used in an application combined
with RSA_NO_PADDING in order to implement OAEP with an encoding parame‐
ter.
The RSA_padding_add_xxx() functions encode 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 modification none
simply copy the data
The random number generator must be seeded prior to calling the
RSA_padding_add_xxx() functions.
The RSA_padding_check_xxx() functions verify that the fl bytes at f
contain a valid encoding for an rsa_len byte RSA key in the respective
encoding method. It then 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. The 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 recov‐
ered data, -1 on error. Error codes can be obtained by calling
ERR_get_error().
HISTORY
The RSA_padding_add_PKCS1_type_1(), RSA_padding_check_PKCS1_type_1(),
RSA_padding_add_PKCS1_type_2(), RSA_padding_check_PKCS1_type_2(),
RSA_padding_add_SSLv23(), RSA_padding_check_SSLv23(), RSA_pad‐
ding_add_none(), and RSA_padding_check_none() functions appeared in
SSLeay 0.9.0.
The RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP()
functions were added in OpenSSL 0.9.2b.
SEE ALSO
Functions: RSA_public_encrypt(3), RSA_private_decrypt(3), RSA_sign(3),
RSA_verify(3)RSA_padding_add_PKCS1_type_1(3)