/* rsa.h
 *
 * Copyright (C) 2006-2025 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */

/* rsa.h for openSSL */


#ifndef WOLFSSL_RSA_H_
#define WOLFSSL_RSA_H_

#include <wolfssl/openssl/bn.h>
#include <wolfssl/openssl/err.h>
#include <wolfssl/openssl/compat_types.h>
#include <wolfssl/wolfcrypt/types.h>
#include <wolfssl/wolfcrypt/rsa.h>

#ifdef __cplusplus
    extern "C" {
#endif

#if defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL)

/* Padding types */
#define WC_RSA_PKCS1_PADDING      0
#define WC_RSA_PKCS1_OAEP_PADDING 1
#define WC_RSA_PKCS1_PSS_PADDING  2

/* RSA PSS Salt special cases */
/* Salt length same as digest length */
#define WC_RSA_PSS_SALTLEN_DIGEST   (-1)
/* Old max salt length */
#define WC_RSA_PSS_SALTLEN_MAX_SIGN (-2)
/* Verification only value to indicate to discover salt length. */
#define WC_RSA_PSS_SALTLEN_AUTO     (-2)
/* Max salt length */
#define WC_RSA_PSS_SALTLEN_MAX      (-3)


#ifndef OPENSSL_COEXIST

/* Padding types */
#define RSA_PKCS1_PADDING       WC_RSA_PKCS1_PADDING
#define RSA_PKCS1_OAEP_PADDING  WC_RSA_PKCS1_OAEP_PADDING
#define RSA_PKCS1_PSS_PADDING   WC_RSA_PKCS1_PSS_PADDING
#define RSA_NO_PADDING          WC_RSA_NO_PAD

/* Emulate OpenSSL flags */
#define RSA_METHOD_FLAG_NO_CHECK        (1 << 1)
#define RSA_FLAG_CACHE_PUBLIC           (1 << 2)
#define RSA_FLAG_CACHE_PRIVATE          (1 << 3)
#define RSA_FLAG_BLINDING               (1 << 4)
#define RSA_FLAG_THREAD_SAFE            (1 << 5)
#define RSA_FLAG_EXT_PKEY               (1 << 6)
#define RSA_FLAG_NO_BLINDING            (1 << 7)
#define RSA_FLAG_NO_CONSTTIME           (1 << 8)

#define RSA_PSS_SALTLEN_DIGEST   WC_RSA_PSS_SALTLEN_DIGEST
#define RSA_PSS_SALTLEN_MAX_SIGN WC_RSA_PSS_SALTLEN_MAX_SIGN
#define RSA_PSS_SALTLEN_AUTO     WC_RSA_PSS_SALTLEN_AUTO
#define RSA_PSS_SALTLEN_MAX      WC_RSA_PSS_SALTLEN_MAX
#endif /* OPENSSL_EXTRA || OPENSSL_EXTRA_X509_SMALL */

#endif /* !OPENSSL_COEXIST */

typedef struct WOLFSSL_RSA_METHOD {
    /* Flags of RSA key implementation. */
    int flags;
    /* Name of RSA key implementation. */
    char *name;
    /* RSA method dynamically allocated. */
    WC_BITFIELD dynamic:1;
} WOLFSSL_RSA_METHOD;

#ifndef WOLFSSL_RSA_TYPE_DEFINED /* guard on redeclaration */
#define WOLFSSL_RSA_TYPE_DEFINED
/* RSA key compatible with OpenSSL. */
typedef struct WOLFSSL_RSA {
    WOLFSSL_BIGNUM* n;              /* Modulus. */
    WOLFSSL_BIGNUM* e;              /* Public exponent. */
    WOLFSSL_BIGNUM* d;              /* Private exponent. */
    WOLFSSL_BIGNUM* p;              /* First prime. */
    WOLFSSL_BIGNUM* q;              /* Second prime. */
    WOLFSSL_BIGNUM* dmp1;           /* dP = d mod (p - 1) */
    WOLFSSL_BIGNUM* dmq1;           /* dQ = d mod (q - 1) */
    WOLFSSL_BIGNUM* iqmp;           /* u = (1 / q) mod p */
    void* heap;                     /* Heap used for memory allocations. */
    void* internal;                 /* wolfCrypt RSA key. */
#if defined(OPENSSL_EXTRA)
    const WOLFSSL_RSA_METHOD* meth; /* RSA method. */
#endif
#ifdef HAVE_EX_DATA
    WOLFSSL_CRYPTO_EX_DATA ex_data;  /* external data */
#endif
    wolfSSL_Ref ref;                 /* Reference count information. */
    word16 pkcs8HeaderSz;            /* Size of PKCS#8 header from decode. */
    int flags;                       /* Flags of implementation. */

    /* bits */
    WC_BITFIELD inSet:1;             /* Internal set from external. */
    WC_BITFIELD exSet:1;             /* External set from internal. */
    WC_BITFIELD ownRng:1;            /* Rng needs to be free'd. */
} WOLFSSL_RSA;
#endif

#if !defined(OPENSSL_COEXIST) && (defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL))
typedef WOLFSSL_RSA                   RSA;
typedef WOLFSSL_RSA_METHOD            RSA_METHOD;
#endif /* !OPENSSL_COEXIST && (OPENSSL_EXTRA || OPENSSL_EXTRA_X509_SMALL) */

WOLFSSL_API WOLFSSL_RSA* wolfSSL_RSA_new_ex(void* heap, int devId);
WOLFSSL_API WOLFSSL_RSA* wolfSSL_RSA_new(void);
WOLFSSL_API void        wolfSSL_RSA_free(WOLFSSL_RSA* rsa);

WOLFSSL_API int wolfSSL_RSA_generate_key_ex(WOLFSSL_RSA* rsa, int bits,
                                            WOLFSSL_BIGNUM* bn, void* cb);

WOLFSSL_API int wolfSSL_RSA_blinding_on(WOLFSSL_RSA* rsa, WOLFSSL_BN_CTX* bn);
WOLFSSL_API int wolfSSL_RSA_check_key(const WOLFSSL_RSA* rsa);
WOLFSSL_API int wolfSSL_RSA_public_encrypt(int len, const unsigned char* fr,
                                       unsigned char* to, WOLFSSL_RSA* rsa,
                                       int padding);
WOLFSSL_API int wolfSSL_RSA_private_decrypt(int len, const unsigned char* fr,
                                       unsigned char* to, WOLFSSL_RSA* rsa,
                                       int padding);
WOLFSSL_API int wolfSSL_RSA_private_encrypt(int len, const unsigned char* in,
                            unsigned char* out, WOLFSSL_RSA* rsa, int padding);

WOLFSSL_API int wolfSSL_RSA_size(const WOLFSSL_RSA* rsa);
WOLFSSL_API int wolfSSL_RSA_bits(const WOLFSSL_RSA* rsa);
WOLFSSL_API int wolfSSL_RSA_sign(int type, const unsigned char* m,
                               unsigned int mLen, unsigned char* sigRet,
                               unsigned int* sigLen, WOLFSSL_RSA* rsa);
WOLFSSL_API int wolfSSL_RSA_sign_ex(int hashAlg,
                               const unsigned char* hash, unsigned int hLen,
                               unsigned char* sigRet, unsigned int* sigLen,
                               WOLFSSL_RSA* rsa, int flag);
WOLFSSL_API int wolfSSL_RSA_sign_generic_padding(int hashAlg,
                               const unsigned char* hash, unsigned int hLen,
                               unsigned char* sigRet, unsigned int* sigLen,
                               WOLFSSL_RSA* rsa, int flag, int padding);

WOLFSSL_LOCAL int wolfSSL_RSA_sign_mgf(int hashAlg,
                                const unsigned char* hash, unsigned int hLen,
                                unsigned char* sigRet, unsigned int* sigLen,
                                WOLFSSL_RSA* rsa, int flag, int padding,
                                int mgf1Hash, int saltLen);

WOLFSSL_API int wolfSSL_RSA_verify(int hashAlg,
                               const unsigned char* hash, unsigned int hLen,
                               const unsigned char* sig, unsigned int sigLen,
                               WOLFSSL_RSA* rsa);
WOLFSSL_API int wolfSSL_RSA_verify_ex(int hashAlg,
                               const unsigned char* hash, unsigned int hLen,
                               const unsigned char* sig, unsigned int sigLen,
                               WOLFSSL_RSA* rsa, int padding);
WOLFSSL_LOCAL int wolfSSL_RSA_verify_mgf(int hashAlg,
                                const unsigned char* hash, unsigned int hLen,
                                const unsigned char* sig, unsigned int sigLen,
                                WOLFSSL_RSA* rsa, int padding,
                                int mgf1Hash, int saltLen);
WOLFSSL_API int wolfSSL_RSA_public_decrypt(int flen, const unsigned char* from,
                               unsigned char* to, WOLFSSL_RSA* rsa, int padding);
WOLFSSL_API int wolfSSL_RSA_GenAdd(WOLFSSL_RSA* rsa);
WOLFSSL_API int wolfSSL_RSA_LoadDer(WOLFSSL_RSA* rsa,
                               const unsigned char* derBuf, int derSz);
WOLFSSL_API int wolfSSL_RSA_LoadDer_ex(WOLFSSL_RSA* rsa,
                               const unsigned char* derBuf, int derSz, int opt);

WOLFSSL_API WOLFSSL_RSA_METHOD *wolfSSL_RSA_meth_new(const char *name, int flags);
WOLFSSL_API void wolfSSL_RSA_meth_free(WOLFSSL_RSA_METHOD *meth);
WOLFSSL_API int wolfSSL_RSA_meth_set(WOLFSSL_RSA_METHOD *rsa, void* p);
WOLFSSL_API int wolfSSL_RSA_set_method(WOLFSSL_RSA *rsa, WOLFSSL_RSA_METHOD *meth);
WOLFSSL_API const WOLFSSL_RSA_METHOD* wolfSSL_RSA_get_method(const WOLFSSL_RSA *rsa);
WOLFSSL_API const WOLFSSL_RSA_METHOD* wolfSSL_RSA_get_default_method(void);

WOLFSSL_API void wolfSSL_RSA_get0_crt_params(const WOLFSSL_RSA *r,
                                             const WOLFSSL_BIGNUM **dmp1,
                                             const WOLFSSL_BIGNUM **dmq1,
                                             const WOLFSSL_BIGNUM **iqmp);
WOLFSSL_API int wolfSSL_RSA_set0_crt_params(WOLFSSL_RSA *r, WOLFSSL_BIGNUM *dmp1,
                                            WOLFSSL_BIGNUM *dmq1, WOLFSSL_BIGNUM *iqmp);
WOLFSSL_API void wolfSSL_RSA_get0_factors(const WOLFSSL_RSA *r, const WOLFSSL_BIGNUM **p,
                                          const WOLFSSL_BIGNUM **q);
WOLFSSL_API int wolfSSL_RSA_set0_factors(WOLFSSL_RSA *r, WOLFSSL_BIGNUM *p, WOLFSSL_BIGNUM *q);
WOLFSSL_API void wolfSSL_RSA_get0_key(const WOLFSSL_RSA *r, const WOLFSSL_BIGNUM **n,
                                      const WOLFSSL_BIGNUM **e, const WOLFSSL_BIGNUM **d);
WOLFSSL_API int wolfSSL_RSA_set0_key(WOLFSSL_RSA *r, WOLFSSL_BIGNUM *n, WOLFSSL_BIGNUM *e,
                                     WOLFSSL_BIGNUM *d);
WOLFSSL_API int wolfSSL_RSA_flags(const WOLFSSL_RSA *r);
WOLFSSL_API void wolfSSL_RSA_set_flags(WOLFSSL_RSA *r, int flags);
WOLFSSL_API void wolfSSL_RSA_clear_flags(WOLFSSL_RSA *r, int flags);
WOLFSSL_API int wolfSSL_RSA_test_flags(const WOLFSSL_RSA *r, int flags);

WOLFSSL_API WOLFSSL_RSA* wolfSSL_RSAPublicKey_dup(WOLFSSL_RSA *rsa);

WOLFSSL_API void* wolfSSL_RSA_get_ex_data(const WOLFSSL_RSA *rsa, int idx);
WOLFSSL_API int wolfSSL_RSA_set_ex_data(WOLFSSL_RSA *rsa, int idx, void *data);
#ifdef HAVE_EX_DATA_CLEANUP_HOOKS
WOLFSSL_API int wolfSSL_RSA_set_ex_data_with_cleanup(
    WOLFSSL_RSA *rsa,
    int idx,
    void *data,
    wolfSSL_ex_data_cleanup_routine_t cleanup_routine);
#endif

#if defined(OPENSSL_EXTRA) || defined(OPENSSL_EXTRA_X509_SMALL)

#define WOLFSSL_RSA_LOAD_PRIVATE 1
#define WOLFSSL_RSA_LOAD_PUBLIC  2
#define WOLFSSL_RSA_F4           0x10001L

#ifndef OPENSSL_COEXIST

#define OPENSSL_RSA_MAX_MODULUS_BITS RSA_MAX_SIZE

#define RSA_new  wolfSSL_RSA_new
#define RSA_free wolfSSL_RSA_free

#define RSA_generate_key_ex wolfSSL_RSA_generate_key_ex

#define RSA_blinding_on     wolfSSL_RSA_blinding_on
#define RSA_check_key       wolfSSL_RSA_check_key
#define RSA_public_encrypt  wolfSSL_RSA_public_encrypt
#define RSA_private_decrypt wolfSSL_RSA_private_decrypt
#define RSA_private_encrypt wolfSSL_RSA_private_encrypt

#define RSA_size           wolfSSL_RSA_size
#define RSA_sign           wolfSSL_RSA_sign
#define RSA_verify         wolfSSL_RSA_verify
#define RSA_public_decrypt wolfSSL_RSA_public_decrypt

#define RSA_meth_new            wolfSSL_RSA_meth_new
#define RSA_meth_free           wolfSSL_RSA_meth_free
#define RSA_meth_set_pub_enc    wolfSSL_RSA_meth_set
#define RSA_meth_set_pub_dec    wolfSSL_RSA_meth_set
#define RSA_meth_set_priv_enc   wolfSSL_RSA_meth_set
#define RSA_meth_set_priv_dec   wolfSSL_RSA_meth_set
#define RSA_meth_set_init       wolfSSL_RSA_meth_set
#define RSA_meth_set_finish     wolfSSL_RSA_meth_set
#define RSA_meth_set0_app_data  wolfSSL_RSA_meth_set
#define RSA_get_default_method  wolfSSL_RSA_get_default_method
#define RSA_get_method          wolfSSL_RSA_get_method
#define RSA_set_method          wolfSSL_RSA_set_method
#define RSA_get0_crt_params     wolfSSL_RSA_get0_crt_params
#define RSA_set0_crt_params     wolfSSL_RSA_set0_crt_params
#define RSA_get0_factors        wolfSSL_RSA_get0_factors
#define RSA_set0_factors        wolfSSL_RSA_set0_factors
#define RSA_get0_key            wolfSSL_RSA_get0_key
#define RSA_set0_key            wolfSSL_RSA_set0_key
#define RSA_flags               wolfSSL_RSA_flags
#define RSA_set_flags           wolfSSL_RSA_set_flags
#define RSA_clear_flags         wolfSSL_RSA_clear_flags
#define RSA_test_flags          wolfSSL_RSA_test_flags

#define RSAPublicKey_dup        wolfSSL_RSAPublicKey_dup
#define RSA_get_ex_data        wolfSSL_RSA_get_ex_data
#define RSA_set_ex_data        wolfSSL_RSA_set_ex_data

#define RSA_get0_key       wolfSSL_RSA_get0_key

#define RSA_F4             WOLFSSL_RSA_F4

#define OPENSSL_RSA_MAX_MODULUS_BITS RSA_MAX_SIZE
#define OPENSSL_RSA_MAX_PUBEXP_BITS  RSA_MAX_SIZE

#endif /* !OPENSSL_COEXIST */

#endif /* OPENSSL_EXTRA || OPENSSL_EXTRA_X509_SMALL */

#ifdef __cplusplus
    }  /* extern "C" */
#endif

#endif /* header */
