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Title "RSA_set_method 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
RSA_set_default_method, RSA_get_default_method, RSA_set_method, RSA_get_method, RSA_PKCS1_SSLeay, RSA_null_method, RSA_flags, RSA_new_method - select RSA method Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> \& void RSA_set_default_method(const RSA_METHOD *meth); \& RSA_METHOD *RSA_get_default_method(void); \& int RSA_set_method(RSA *rsa, const RSA_METHOD *meth); \& RSA_METHOD *RSA_get_method(const RSA *rsa); \& RSA_METHOD *RSA_PKCS1_SSLeay(void); \& RSA_METHOD *RSA_null_method(void); \& int RSA_flags(const RSA *rsa); \& RSA *RSA_new_method(RSA_METHOD *method); .Ve Header "DESCRIPTION" An \s-1RSA_METHOD\s0 specifies the functions that OpenSSL uses for \s-1RSA\s0 operations. By modifying the method, alternative implementations such as hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for important information about how these \s-1RSA API\s0 functions are affected by the use of \s-1ENGINE\s0 \s-1API\s0 calls.

Initially, the default \s-1RSA_METHOD\s0 is the OpenSSL internal implementation, as returned by RSA_PKCS1_SSLeay().

\fIRSA_set_default_method() makes meth the default method for all \s-1RSA\s0 structures created later. \s-1NB\s0: This is true only whilst no \s-1ENGINE\s0 has been set as a default for \s-1RSA,\s0 so this function is no longer recommended.

\fIRSA_get_default_method() returns a pointer to the current default \s-1RSA_METHOD.\s0 However, the meaningfulness of this result is dependent on whether the \s-1ENGINE API\s0 is being used, so this function is no longer recommended.

\fIRSA_set_method() selects meth to perform all operations using the key \fBrsa. This will replace the \s-1RSA_METHOD\s0 used by the \s-1RSA\s0 key and if the previous method was supplied by an \s-1ENGINE,\s0 the handle to that \s-1ENGINE\s0 will be released during the change. It is possible to have \s-1RSA\s0 keys that only work with certain \s-1RSA_METHOD\s0 implementations (eg. from an \s-1ENGINE\s0 module that supports embedded hardware-protected keys), and in such cases attempting to change the \s-1RSA_METHOD\s0 for the key can have unexpected results.

\fIRSA_get_method() returns a pointer to the \s-1RSA_METHOD\s0 being used by rsa. This method may or may not be supplied by an \s-1ENGINE\s0 implementation, but if it is, the return value can only be guaranteed to be valid as long as the \s-1RSA\s0 key itself is valid and does not have its implementation changed by \fIRSA_set_method().

\fIRSA_flags() returns the flags that are set for rsa's current \s-1RSA_METHOD.\s0 See the \s-1BUGS\s0 section.

\fIRSA_new_method() allocates and initializes an \s-1RSA\s0 structure so that \fBengine will be used for the \s-1RSA\s0 operations. If engine is \s-1NULL,\s0 the default \s-1ENGINE\s0 for \s-1RSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1RSA_METHOD\s0 controlled by RSA_set_default_method() is used.

\fIRSA_flags() returns the flags that are set for rsa's current method.

\fIRSA_new_method() allocates and initializes an \s-1RSA\s0 structure so that \fBmethod will be used for the \s-1RSA\s0 operations. If method is \s-1NULL\s0, the default method is used.

Header "THE RSA_METHOD STRUCTURE" .Vb 4 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\*(Aqt 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, const unsigned char *m, unsigned int m_length, unsigned char *sigret, unsigned int *siglen, const RSA *rsa); /* verify. For backward compatibility, this is used only * if (flags & RSA_FLAG_SIGN_VER) */ int (*rsa_verify)(int dtype, const unsigned char *m, unsigned int m_length, const unsigned char *sigbuf, unsigned int siglen, const RSA *rsa); /* keygen. If NULL builtin RSA key generation will be used */ int (*rsa_keygen)(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb); \& } RSA_METHOD; .Ve Header "RETURN VALUES" \fIRSA_PKCS1_SSLeay(), RSA_PKCS1_null_method(), RSA_get_default_method() and RSA_get_method() return pointers to the respective RSA_METHODs.

\fIRSA_set_default_method() returns no value.

\fIRSA_set_method() returns a pointer to the old \s-1RSA_METHOD\s0 implementation that was replaced. However, this return value should probably be ignored because if it was supplied by an \s-1ENGINE,\s0 the pointer could be invalidated at any time if the \s-1ENGINE\s0 is unloaded (in fact it could be unloaded as a result of the RSA_set_method() function releasing its handle to the \s-1ENGINE\s0). For this reason, the return type may be replaced with a void declaration in a future release.

\fIRSA_new_method() returns \s-1NULL\s0 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.

Header "NOTES" As of version 0.9.7, \s-1RSA_METHOD\s0 implementations are grouped together with other algorithmic APIs (eg. \s-1DSA_METHOD, EVP_CIPHER,\s0 etc) into \s-1ENGINE\s0 modules. If a default \s-1ENGINE\s0 is specified for \s-1RSA\s0 functionality using an \s-1ENGINE API\s0 function, that will override any \s-1RSA\s0 defaults set using the \s-1RSA API \s0(ie. RSA_set_default_method()). For this reason, the \s-1ENGINE API\s0 is the recommended way to control default implementations for use in \s-1RSA\s0 and other cryptographic algorithms. Header "BUGS" The behaviour of RSA_flags() is a mis-feature that is left as-is for now to avoid creating compatibility problems. \s-1RSA\s0 functionality, such as the encryption functions, are controlled by the flags value in the \s-1RSA\s0 key itself, not by the flags value in the \s-1RSA_METHOD\s0 attached to the \s-1RSA\s0 key (which is what this function returns). If the flags element of an \s-1RSA\s0 key is changed, the changes will be honoured by \s-1RSA\s0 functionality but will not be reflected in the return value of the RSA_flags() function - in effect \fIRSA_flags() behaves more like an RSA_default_flags() function (which does not currently exist). Header "SEE ALSO" \fIrsa\|(3), RSA_new\|(3) Header "HISTORY" \fIRSA_new_method() and RSA_set_default_method() appeared in SSLeay 0.8. \fIRSA_get_default_method(), RSA_set_method() and RSA_get_method() as well as the rsa_sign and rsa_verify components of \s-1RSA_METHOD\s0 were added in OpenSSL 0.9.4.

\fIRSA_set_default_openssl_method() and RSA_get_default_openssl_method() replaced RSA_set_default_method() and RSA_get_default_method() respectively, and RSA_set_method() and RSA_new_method() were altered to use \fB\s-1ENGINE\s0s rather than \s-1RSA_METHOD\s0s during development of the engine version of OpenSSL 0.9.6. For 0.9.7, the handling of defaults in the \s-1ENGINE API\s0 was restructured so that this change was reversed, and behaviour of the other functions resembled more closely the previous behaviour. The behaviour of defaults in the \s-1ENGINE API\s0 now transparently overrides the behaviour of defaults in the \s-1RSA API\s0 without requiring changing these function prototypes.