RSA_padding_add_PKCS1_type_1(3) OpenSSL RSA_padding_add_PKCS1_type_1(3)NAME
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_PKCS1_OAEP, RSA_padding_check_PKCS1_OAEP,
RSA_padding_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. RSA_padding_add_PKCS1_OAEP() and
RSA_padding_check_PKCS1_OAEP() may be used in an application combined
with RSA_NO_PADDING in order to implement OAEP with an encoding
parameter.
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 modification
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 ALSORSA_public_encrypt(3), RSA_private_decrypt(3), RSA_sign(3),
RSA_verify(3)HISTORYRSA_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_padding_add_none() and RSA_padding_check_none() appeared in SSLeay
0.9.0.
RSA_padding_add_PKCS1_OAEP() and RSA_padding_check_PKCS1_OAEP() were
added in OpenSSL 0.9.2b.
3rd Berkeley Distribution 0.9.8e RSA_padding_add_PKCS1_type_1(3)
