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Title "RSA_METH_NEW 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
RSA_meth_get0_app_data, RSA_meth_set0_app_data, RSA_meth_new, RSA_meth_free, RSA_meth_dup, RSA_meth_get0_name, RSA_meth_set1_name, RSA_meth_get_flags, RSA_meth_set_flags, RSA_meth_get_pub_enc, RSA_meth_set_pub_enc, RSA_meth_get_pub_dec, RSA_meth_set_pub_dec, RSA_meth_get_priv_enc, RSA_meth_set_priv_enc, RSA_meth_get_priv_dec, RSA_meth_set_priv_dec, RSA_meth_get_mod_exp, RSA_meth_set_mod_exp, RSA_meth_get_bn_mod_exp, RSA_meth_set_bn_mod_exp, RSA_meth_get_init, RSA_meth_set_init, RSA_meth_get_finish, RSA_meth_set_finish, RSA_meth_get_sign, RSA_meth_set_sign, RSA_meth_get_verify, RSA_meth_set_verify, RSA_meth_get_keygen, RSA_meth_set_keygen, RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen \- Routines to build up RSA methods Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> \& RSA_METHOD *RSA_meth_new(const char *name, int flags); void RSA_meth_free(RSA_METHOD *meth); \& RSA_METHOD *RSA_meth_dup(const RSA_METHOD *meth); \& const char *RSA_meth_get0_name(const RSA_METHOD *meth); int RSA_meth_set1_name(RSA_METHOD *meth, const char *name); \& int RSA_meth_get_flags(const RSA_METHOD *meth); int RSA_meth_set_flags(RSA_METHOD *meth, int flags); \& void *RSA_meth_get0_app_data(const RSA_METHOD *meth); int RSA_meth_set0_app_data(RSA_METHOD *meth, void *app_data); \& int (*RSA_meth_get_pub_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding); int RSA_meth_set_pub_enc(RSA_METHOD *rsa, int (*pub_enc)(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)); \& int (*RSA_meth_get_pub_dec(const RSA_METHOD *meth)) (int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding); int RSA_meth_set_pub_dec(RSA_METHOD *rsa, int (*pub_dec)(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)); \& int (*RSA_meth_get_priv_enc(const RSA_METHOD *meth))(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding); int RSA_meth_set_priv_enc(RSA_METHOD *rsa, int (*priv_enc)(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)); \& int (*RSA_meth_get_priv_dec(const RSA_METHOD *meth))(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding); int RSA_meth_set_priv_dec(RSA_METHOD *rsa, int (*priv_dec)(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding)); \& /* Can be null */ int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))(BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx); int RSA_meth_set_mod_exp(RSA_METHOD *rsa, int (*mod_exp)(BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx)); \& /* Can be null */ int (*RSA_meth_get_bn_mod_exp(const RSA_METHOD *meth))(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx); int RSA_meth_set_bn_mod_exp(RSA_METHOD *rsa, int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)); \& /* called at new */ int (*RSA_meth_get_init(const RSA_METHOD *meth) (RSA *rsa); int RSA_meth_set_init(RSA_METHOD *rsa, int (*init (RSA *rsa)); \& /* called at free */ int (*RSA_meth_get_finish(const RSA_METHOD *meth))(RSA *rsa); int RSA_meth_set_finish(RSA_METHOD *rsa, int (*finish)(RSA *rsa)); \& int (*RSA_meth_get_sign(const RSA_METHOD *meth))(int type, const unsigned char *m, unsigned int m_length, unsigned char *sigret, unsigned int *siglen, const RSA *rsa); int RSA_meth_set_sign(RSA_METHOD *rsa, int (*sign)(int type, const unsigned char *m, unsigned int m_length, unsigned char *sigret, unsigned int *siglen, const RSA *rsa)); \& int (*RSA_meth_get_verify(const RSA_METHOD *meth))(int dtype, const unsigned char *m, unsigned int m_length, const unsigned char *sigbuf, unsigned int siglen, const RSA *rsa); int RSA_meth_set_verify(RSA_METHOD *rsa, int (*verify)(int dtype, const unsigned char *m, unsigned int m_length, const unsigned char *sigbuf, unsigned int siglen, const RSA *rsa)); \& int (*RSA_meth_get_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb); int RSA_meth_set_keygen(RSA_METHOD *rsa, int (*keygen)(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb)); \& int (*RSA_meth_get_multi_prime_keygen(const RSA_METHOD *meth))(RSA *rsa, int bits, int primes, BIGNUM *e, BN_GENCB *cb); \& int RSA_meth_set_multi_prime_keygen(RSA_METHOD *meth, int (*keygen) (RSA *rsa, int bits, int primes, BIGNUM *e, BN_GENCB *cb)); .Ve Header "DESCRIPTION" The \s-1RSA_METHOD\s0 type is a structure used for the provision of custom \s-1RSA\s0 implementations. It provides a set of functions used by OpenSSL for the implementation of the various \s-1RSA\s0 capabilities. See the rsa page for more information.

\fBRSA_meth_new() creates a new \s-1RSA_METHOD\s0 structure. It should be given a unique name and a set of flags. The name should be a \s-1NULL\s0 terminated string, which will be duplicated and stored in the \fB\s-1RSA_METHOD\s0 object. It is the callers responsibility to free the original string. The flags will be used during the construction of a new \s-1RSA\s0 object based on this \s-1RSA_METHOD\s0. Any new \s-1RSA\s0 object will have those flags set by default.

\fBRSA_meth_dup() creates a duplicate copy of the \s-1RSA_METHOD\s0 object passed as a parameter. This might be useful for creating a new \fB\s-1RSA_METHOD\s0 based on an existing one, but with some differences.

\fBRSA_meth_free() destroys an \s-1RSA_METHOD\s0 structure and frees up any memory associated with it.

\fBRSA_meth_get0_name() will return a pointer to the name of this \s-1RSA_METHOD.\s0 This is a pointer to the internal name string and so should not be freed by the caller. RSA_meth_set1_name() sets the name of the \s-1RSA_METHOD\s0 to name. The string is duplicated and the copy is stored in the \s-1RSA_METHOD\s0 structure, so the caller remains responsible for freeing the memory associated with the name.

\fBRSA_meth_get_flags() returns the current value of the flags associated with this \s-1RSA_METHOD.\s0 RSA_meth_set_flags() provides the ability to set these flags.

The functions RSA_meth_get0_app_data() and RSA_meth_set0_app_data() provide the ability to associate implementation specific data with the \s-1RSA_METHOD.\s0 It is the application's responsibility to free this data before the \s-1RSA_METHOD\s0 is freed via a call to RSA_meth_free().

\fBRSA_meth_get_sign() and RSA_meth_set_sign() get and set the function used for creating an \s-1RSA\s0 signature respectively. This function will be called in response to the application calling RSA_sign(). The parameters for the function have the same meaning as for RSA_sign().

\fBRSA_meth_get_verify() and RSA_meth_set_verify() get and set the function used for verifying an \s-1RSA\s0 signature respectively. This function will be called in response to the application calling \fBRSA_verify(). The parameters for the function have the same meaning as for RSA_verify().

\fBRSA_meth_get_mod_exp() and RSA_meth_set_mod_exp() get and set the function used for \s-1CRT\s0 computations.

\fBRSA_meth_get_bn_mod_exp() and RSA_meth_set_bn_mod_exp() get and set the function used for \s-1CRT\s0 computations, specifically the following value:

.Vb 1 r = a ^ p mod m .Ve

Both the mod_exp() and bn_mod_exp() functions are called by the default OpenSSL method during encryption, decryption, signing and verification.

\fBRSA_meth_get_init() and RSA_meth_set_init() get and set the function used for creating a new \s-1RSA\s0 instance respectively. This function will be called in response to the application calling RSA_new() (if the current default \s-1RSA_METHOD\s0 is this one) or RSA_new_method(). The \fBRSA_new() and RSA_new_method() functions will allocate the memory for the new \s-1RSA\s0 object, and a pointer to this newly allocated structure will be passed as a parameter to the function. This function may be \s-1NULL.\s0

\fBRSA_meth_get_finish() and RSA_meth_set_finish() get and set the function used for destroying an instance of an \s-1RSA\s0 object respectively. This function will be called in response to the application calling \fBRSA_free(). A pointer to the \s-1RSA\s0 to be destroyed is passed as a parameter. The destroy function should be used for \s-1RSA\s0 implementation specific clean up. The memory for the \s-1RSA\s0 itself should not be freed by this function. This function may be \s-1NULL.\s0

\fBRSA_meth_get_keygen() and RSA_meth_set_keygen() get and set the function used for generating a new \s-1RSA\s0 key pair respectively. This function will be called in response to the application calling \fBRSA_generate_key_ex(). The parameter for the function has the same meaning as for RSA_generate_key_ex().

\fBRSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() get and set the function used for generating a new multi-prime \s-1RSA\s0 key pair respectively. This function will be called in response to the application calling \fBRSA_generate_multi_prime_key(). The parameter for the function has the same meaning as for RSA_generate_multi_prime_key().

\fBRSA_meth_get_pub_enc(), RSA_meth_set_pub_enc(), \fBRSA_meth_get_pub_dec(), RSA_meth_set_pub_dec(), \fBRSA_meth_get_priv_enc(), RSA_meth_set_priv_enc(), \fBRSA_meth_get_priv_dec(), RSA_meth_set_priv_dec() get and set the functions used for public and private key encryption and decryption. These functions will be called in response to the application calling \fBRSA_public_encrypt(), RSA_private_decrypt(), RSA_private_encrypt() and \fBRSA_public_decrypt() and take the same parameters as those.

Header "RETURN VALUES" \fBRSA_meth_new() and RSA_meth_dup() return the newly allocated \s-1RSA_METHOD\s0 object or \s-1NULL\s0 on failure.

\fBRSA_meth_get0_name() and RSA_meth_get_flags() return the name and flags associated with the \s-1RSA_METHOD\s0 respectively.

All other RSA_meth_get_*() functions return the appropriate function pointer that has been set in the \s-1RSA_METHOD,\s0 or \s-1NULL\s0 if no such pointer has yet been set.

RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on success or 0 on failure.

Header "SEE ALSO" \fBRSA_new\|(3), RSA_generate_key_ex\|(3), RSA_sign\|(3), \fBRSA_set_method\|(3), RSA_size\|(3), RSA_get0_key\|(3), \fBRSA_generate_multi_prime_key\|(3) Header "HISTORY" \fBRSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() were added in OpenSSL 1.1.1.

Other functions described here were added in OpenSSL 1.1.0.

Header "COPYRIGHT" Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.