154 lines
4.7 KiB
Text
154 lines
4.7 KiB
Text
=pod
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=head1 NAME
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RSA_set_default_method, RSA_get_default_method, RSA_set_method,
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RSA_get_method, RSA_PKCS1_SSLeay, RSA_PKCS1_RSAref,
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RSA_null_method, RSA_flags, RSA_new_method - select RSA method
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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void RSA_set_default_method(RSA_METHOD *meth);
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RSA_METHOD *RSA_get_default_method(void);
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RSA_METHOD *RSA_set_method(RSA *rsa, RSA_METHOD *meth);
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RSA_METHOD *RSA_get_method(RSA *rsa);
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RSA_METHOD *RSA_PKCS1_SSLeay(void);
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RSA_METHOD *RSA_PKCS1_RSAref(void);
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RSA_METHOD *RSA_null_method(void);
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int RSA_flags(RSA *rsa);
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RSA *RSA_new_method(RSA_METHOD *method);
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=head1 DESCRIPTION
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An B<RSA_METHOD> specifies the functions that OpenSSL uses for RSA
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operations. By modifying the method, alternative implementations
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such as hardware accelerators may be used.
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Initially, the default is to use the OpenSSL internal implementation,
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unless OpenSSL was configured with the C<rsaref> or C<-DRSA_NULL>
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options. RSA_PKCS1_SSLeay() returns a pointer to that method.
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RSA_PKCS1_RSAref() returns a pointer to a method that uses the RSAref
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library. This is the default method in the C<rsaref> configuration;
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the function is not available in other configurations.
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RSA_null_method() returns a pointer to a method that does not support
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the RSA transformation. It is the default if OpenSSL is compiled with
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C<-DRSA_NULL>. These methods may be useful in the USA because of a
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patent on the RSA cryptosystem.
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RSA_set_default_method() makes B<meth> the default method for all B<RSA>
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structures created later.
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RSA_get_default_method() returns a pointer to the current default
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method.
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RSA_set_method() selects B<meth> for all operations using the key
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B<rsa>.
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RSA_get_method() returns a pointer to the method currently selected
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for B<rsa>.
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RSA_flags() returns the B<flags> that are set for B<rsa>'s current method.
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RSA_new_method() allocates and initializes an B<RSA> structure so that
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B<method> will be used for the RSA operations. If B<method> is B<NULL>,
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the default method is used.
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=head1 THE RSA_METHOD STRUCTURE
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typedef struct rsa_meth_st
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{
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/* name of the implementation */
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const char *name;
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/* encrypt */
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int (*rsa_pub_enc)(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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/* verify arbitrary data */
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int (*rsa_pub_dec)(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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/* sign arbitrary data */
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int (*rsa_priv_enc)(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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/* decrypt */
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int (*rsa_priv_dec)(int flen, unsigned char *from,
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unsigned char *to, RSA *rsa, int padding);
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/* compute r0 = r0 ^ I mod rsa->n (May be NULL for some
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implementations) */
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int (*rsa_mod_exp)(BIGNUM *r0, BIGNUM *I, RSA *rsa);
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/* compute r = a ^ p mod m (May be NULL for some implementations) */
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int (*bn_mod_exp)(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
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const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
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/* called at RSA_new */
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int (*init)(RSA *rsa);
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/* called at RSA_free */
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int (*finish)(RSA *rsa);
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/* RSA_FLAG_EXT_PKEY - rsa_mod_exp is called for private key
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* operations, even if p,q,dmp1,dmq1,iqmp
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* are NULL
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* RSA_FLAG_SIGN_VER - enable rsa_sign and rsa_verify
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* RSA_METHOD_FLAG_NO_CHECK - don't check pub/private match
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*/
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int flags;
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char *app_data; /* ?? */
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/* sign. For backward compatibility, this is used only
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* if (flags & RSA_FLAG_SIGN_VER)
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*/
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int (*rsa_sign)(int type, unsigned char *m, unsigned int m_len,
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unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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/* verify. For backward compatibility, this is used only
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* if (flags & RSA_FLAG_SIGN_VER)
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*/
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int (*rsa_verify)(int type, unsigned char *m, unsigned int m_len,
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unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
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} RSA_METHOD;
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=head1 RETURN VALUES
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RSA_PKCS1_SSLeay(), RSA_PKCS1_RSAref(), RSA_PKCS1_null_method(),
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RSA_get_default_method() and RSA_get_method() return pointers to the
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respective B<RSA_METHOD>s.
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RSA_set_default_method() returns no value.
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RSA_set_method() returns a pointer to the B<RSA_METHOD> previously
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associated with B<rsa>.
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RSA_new_method() returns B<NULL> and sets an error code that can be
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obtained by L<ERR_get_error(3)|ERR_get_error(3)> if the allocation fails. Otherwise it
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returns a pointer to the newly allocated structure.
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=head1 SEE ALSO
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L<rsa(3)|rsa(3)>, L<RSA_new(3)|RSA_new(3)>
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=head1 HISTORY
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RSA_new_method() and RSA_set_default_method() appeared in SSLeay 0.8.
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RSA_get_default_method(), RSA_set_method() and RSA_get_method() as
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well as the rsa_sign and rsa_verify components of RSA_METHOD were
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added in OpenSSL 0.9.4.
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=cut
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