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
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RSA_set_method(3) OpenSSL RSA_set_method(3)
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);
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RSA_set_method(3) OpenSSL RSA_set_method(3)
/* 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.
RSA_get_method, RSA_PKCS1_SSLeay, RSA_PKCS1_RSAref,
RSA_null_method, RSA_flags, RSA_new_method - select RSA
method"
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RSA_set_method(3) OpenSSL RSA_set_method(3)26/Feb/2001 0.9.6 4
