RSA_set_method(3) OpenSSL RSA_set_method(3)NAME
RSA_set_default_method, RSA_get_default_method, RSA_set_method,
RSA_get_method, RSA_PKCS1_SSLeay, RSA_PKCS1_RSAref, RSA_null_method,
RSA_flags, RSA_new_method - select RSA method
SYNOPSIS
#include <openssl/rsa.h>
void RSA_set_default_method(RSA_METHOD *meth);
RSA_METHOD *RSA_get_default_method(void);
RSA_METHOD *RSA_set_method(RSA *rsa, RSA_METHOD *meth);
RSA_METHOD *RSA_get_method(RSA *rsa);
RSA_METHOD *RSA_PKCS1_SSLeay(void);
RSA_METHOD *RSA_PKCS1_RSAref(void);
RSA_METHOD *RSA_null_method(void);
int RSA_flags(RSA *rsa);
RSA *RSA_new_method(RSA_METHOD *method);
DESCRIPTION
An RSA_METHOD specifies the functions that OpenSSL uses for RSA
operations. By modifying the method, alternative implementations such
as hardware accelerators may be used.
Initially, the default is to use the OpenSSL internal implementation,
unless OpenSSL was configured with the rsaref or -DRSA_NULL options.
RSA_PKCS1_SSLeay() returns a pointer to that method.
RSA_PKCS1_RSAref() returns a pointer to a method that uses the RSAref
library. This is the default method in the rsaref configuration; the
function is not available in other configurations. RSA_null_method()
returns a pointer to a method that does not support the RSA
transformation. It is the default if OpenSSL is compiled with
-DRSA_NULL. These methods may be useful in the USA because of a patent
on the RSA cryptosystem.
RSA_set_default_method() makes meth the default method for all RSA
structures created later.
RSA_get_default_method() returns a pointer to the current default
method.
RSA_set_method() selects meth for all operations using the key rsa.
RSA_get_method() returns a pointer to the method currently selected for
rsa.
RSA_flags() returns the flags that are set for rsa's current method.
RSA_new_method() allocates and initializes an RSA structure so that
method will be used for the RSA operations. If method is NULL, the
default method is used.
THE RSA_METHOD STRUCTURE
typedef struct rsa_meth_st
{
/* name of the implementation */
const char *name;
/* encrypt */
int (*rsa_pub_enc)(int flen, unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
/* verify arbitrary data */
int (*rsa_pub_dec)(int flen, unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
/* sign arbitrary data */
int (*rsa_priv_enc)(int flen, unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
/* decrypt */
int (*rsa_priv_dec)(int flen, unsigned char *from,
unsigned char *to, RSA *rsa, int padding);
/* compute r0 = r0 ^ I mod rsa->n (May be NULL for some
implementations) */
int (*rsa_mod_exp)(BIGNUM *r0, BIGNUM *I, RSA *rsa);
/* compute r = a ^ p mod m (May be NULL for some implementations) */
int (*bn_mod_exp)(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
/* called at RSA_new */
int (*init)(RSA *rsa);
/* called at RSA_free */
int (*finish)(RSA *rsa);
/* RSA_FLAG_EXT_PKEY - rsa_mod_exp is called for private key
* operations, even if p,q,dmp1,dmq1,iqmp
* are NULL
* RSA_FLAG_SIGN_VER - enable rsa_sign and rsa_verify
* RSA_METHOD_FLAG_NO_CHECK - don't check pub/private match
*/
int flags;
char *app_data; /* ?? */
/* sign. For backward compatibility, this is used only
* if (flags & RSA_FLAG_SIGN_VER)
*/
int (*rsa_sign)(int type, unsigned char *m, unsigned int m_len,
unsigned char *sigret, unsigned int *siglen, RSA *rsa);
/* verify. For backward compatibility, this is used only
* if (flags & RSA_FLAG_SIGN_VER)
*/
int (*rsa_verify)(int type, unsigned char *m, unsigned int m_len,
unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
} RSA_METHOD;
RETURN VALUESRSA_PKCS1_SSLeay(), RSA_PKCS1_RSAref(), RSA_PKCS1_null_method(),
RSA_get_default_method() and RSA_get_method() return pointers to the
respective RSA_METHODs.
RSA_set_default_method() returns no value.
RSA_set_method() returns a pointer to the RSA_METHOD previously
associated with rsa.
RSA_new_method() returns NULL and sets an error code that can be
obtained by ERR_get_error(3) if the allocation fails. Otherwise it
returns a pointer to the newly allocated structure.
SEE ALSOrsa(3), RSA_new(3)HISTORYRSA_new_method() and RSA_set_default_method() appeared in SSLeay 0.8.
RSA_get_default_method(), RSA_set_method() and RSA_get_method() as well
as the rsa_sign and rsa_verify components of RSA_METHOD were added in
OpenSSL 0.9.4.
3rd Berkeley Distribution 0.9.6m RSA_set_method(3)
