/*

 * Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * RSA low level APIs are deprecated for public use, but still ok for

 * internal use.

 */

#include "internal/deprecated.h"

#include <openssl/core_dispatch.h>

#include <openssl/core_names.h>

#include <openssl/bn.h>

#include <openssl/err.h>

#include <openssl/rsa.h>

#include <openssl/evp.h>

#include <openssl/proverr.h>

#include "prov/implementations.h"

#include "prov/providercommon.h"

#include "prov/provider_ctx.h"

#include "crypto/rsa.h"

#include "crypto/cryptlib.h"

#include "internal/param_build_set.h"

static OSSL_FUNC_keymgmt_new_fn rsa_newdata;

static OSSL_FUNC_keymgmt_new_fn rsapss_newdata;

static OSSL_FUNC_keymgmt_gen_init_fn rsa_gen_init;

static OSSL_FUNC_keymgmt_gen_init_fn rsapss_gen_init;

static OSSL_FUNC_keymgmt_gen_set_params_fn rsa_gen_set_params;

static OSSL_FUNC_keymgmt_gen_settable_params_fn rsa_gen_settable_params;

static OSSL_FUNC_keymgmt_gen_settable_params_fn rsapss_gen_settable_params;

static OSSL_FUNC_keymgmt_gen_fn rsa_gen;

static OSSL_FUNC_keymgmt_gen_cleanup_fn rsa_gen_cleanup;

static OSSL_FUNC_keymgmt_load_fn rsa_load;

static OSSL_FUNC_keymgmt_load_fn rsapss_load;

static OSSL_FUNC_keymgmt_free_fn rsa_freedata;

static OSSL_FUNC_keymgmt_get_params_fn rsa_get_params;

static OSSL_FUNC_keymgmt_gettable_params_fn rsa_gettable_params;

static OSSL_FUNC_keymgmt_has_fn rsa_has;

static OSSL_FUNC_keymgmt_match_fn rsa_match;

static OSSL_FUNC_keymgmt_validate_fn rsa_validate;

static OSSL_FUNC_keymgmt_import_fn rsa_import;

static OSSL_FUNC_keymgmt_import_types_fn rsa_import_types;

static OSSL_FUNC_keymgmt_export_fn rsa_export;

static OSSL_FUNC_keymgmt_export_types_fn rsa_export_types;

static OSSL_FUNC_keymgmt_query_operation_name_fn rsa_query_operation_name;

static OSSL_FUNC_keymgmt_dup_fn rsa_dup;

#define RSA_DEFAULT_MD "SHA256"

#define RSA_PSS_DEFAULT_MD OSSL_DIGEST_NAME_SHA1

#define RSA_POSSIBLE_SELECTIONS                                        \

    (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS)

DEFINE_STACK_OF(BIGNUM)

DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)

static int pss_params_fromdata(RSA_PSS_PARAMS_30 *pss_params, int *defaults_set,

                               const OSSL_PARAM params[], int rsa_type,

                               OSSL_LIB_CTX *libctx)

{

    if (!ossl_rsa_pss_params_30_fromdata(pss_params, defaults_set,

                                         params, libctx))

        return 0;

    /* If not a PSS type RSA, sending us PSS parameters is wrong */

    if (rsa_type != RSA_FLAG_TYPE_RSASSAPSS

        && !ossl_rsa_pss_params_30_is_unrestricted(pss_params))

        return 0;

    return 1;

}

static void *rsa_newdata(void *provctx)

{

    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);

    RSA *rsa;

    if (!ossl_prov_is_running())

        return NULL;

    rsa = ossl_rsa_new_with_ctx(libctx);

    if (rsa != NULL) {

        RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);

        RSA_set_flags(rsa, RSA_FLAG_TYPE_RSA);

    }

    return rsa;

}

static void *rsapss_newdata(void *provctx)

{

    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);

    RSA *rsa;

    if (!ossl_prov_is_running())

        return NULL;

    rsa = ossl_rsa_new_with_ctx(libctx);

    if (rsa != NULL) {

        RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);

        RSA_set_flags(rsa, RSA_FLAG_TYPE_RSASSAPSS);

    }

    return rsa;

}

static void rsa_freedata(void *keydata)

{

    RSA_free(keydata);

}

static int rsa_has(const void *keydata, int selection)

{

    const RSA *rsa = keydata;

    int ok = 1;

    if (rsa == NULL || !ossl_prov_is_running())

        return 0;

    if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)

        return 1; /* the selection is not missing */

    /* OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS are always available even if empty */

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)

        ok = ok && (RSA_get0_n(rsa) != NULL);

    if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)

        ok = ok && (RSA_get0_e(rsa) != NULL);

    if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)

        ok = ok && (RSA_get0_d(rsa) != NULL);

    return ok;

}

static int rsa_match(const void *keydata1, const void *keydata2, int selection)

{

    const RSA *rsa1 = keydata1;

    const RSA *rsa2 = keydata2;

    int ok = 1;

    if (!ossl_prov_is_running())

        return 0;

    /* There is always an |e| */

    ok = ok && BN_cmp(RSA_get0_e(rsa1), RSA_get0_e(rsa2)) == 0;

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {

        int key_checked = 0;

        if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {

            const BIGNUM *pa = RSA_get0_n(rsa1);

            const BIGNUM *pb = RSA_get0_n(rsa2);

            if (pa != NULL && pb != NULL) {

                ok = ok && BN_cmp(pa, pb) == 0;

                key_checked = 1;

            }

        }

        if (!key_checked

            && (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {

            const BIGNUM *pa = RSA_get0_d(rsa1);

            const BIGNUM *pb = RSA_get0_d(rsa2);

            if (pa != NULL && pb != NULL) {

                ok = ok && BN_cmp(pa, pb) == 0;

                key_checked = 1;

            }

        }

        ok = ok && key_checked;

    }

    return ok;

}

static int rsa_import(void *keydata, int selection, const OSSL_PARAM params[])

{

    RSA *rsa = keydata;

    int rsa_type;

    int ok = 1;

    int pss_defaults_set = 0;

    if (!ossl_prov_is_running() || rsa == NULL)

        return 0;

    if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)

        return 0;

    rsa_type = RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK);

    if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)

        ok = ok && pss_params_fromdata(ossl_rsa_get0_pss_params_30(rsa),

                                       &pss_defaults_set,

                                       params, rsa_type,

                                       ossl_rsa_get0_libctx(rsa));

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {

        int include_private =

            selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;

        ok = ok && ossl_rsa_fromdata(rsa, params, include_private);

    }

    return ok;

}

static int rsa_export(void *keydata, int selection,

                      OSSL_CALLBACK *param_callback, void *cbarg)

{

    RSA *rsa = keydata;

    const RSA_PSS_PARAMS_30 *pss_params = ossl_rsa_get0_pss_params_30(rsa);

    OSSL_PARAM_BLD *tmpl;

    OSSL_PARAM *params = NULL;

    int ok = 1;

    if (!ossl_prov_is_running() || rsa == NULL)

        return 0;

    if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)

        return 0;

    tmpl = OSSL_PARAM_BLD_new();

    if (tmpl == NULL)

        return 0;

    if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)

        ok = ok && (ossl_rsa_pss_params_30_is_unrestricted(pss_params)

                    || ossl_rsa_pss_params_30_todata(pss_params, tmpl, NULL));

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {

        int include_private =

            selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;

        ok = ok && ossl_rsa_todata(rsa, tmpl, NULL, include_private);

    }

    if (!ok || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {

        ok = 0;

        goto err;

    }

    ok = param_callback(params, cbarg);

    OSSL_PARAM_free(params);

err:

    OSSL_PARAM_BLD_free(tmpl);

    return ok;

}

#ifdef FIPS_MODULE

/* In fips mode there are no multi-primes. */

# define RSA_KEY_MP_TYPES()                                                    \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR1, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR2, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT1, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT2, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT1, NULL, 0),

#else

/*

 * We allow up to 10 prime factors (starting with p, q).

 * NOTE: there is only 9 OSSL_PKEY_PARAM_RSA_COEFFICIENT

 */

# define RSA_KEY_MP_TYPES()                                                    \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR1, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR2, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR3, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR4, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR5, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR6, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR7, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR8, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR9, NULL, 0),                           \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR10, NULL, 0),                          \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT1, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT2, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT3, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT4, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT5, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT6, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT7, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT8, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT9, NULL, 0),                         \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT10, NULL, 0),                        \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT1, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT2, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT3, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT4, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT5, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT6, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT7, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT8, NULL, 0),                      \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT9, NULL, 0),

#endif

#define RSA_KEY_TYPES()                                                        \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_N, NULL, 0),                                 \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0),                                 \

OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_D, NULL, 0),                                 \

RSA_KEY_MP_TYPES()

/*

 * This provider can export everything in an RSA key, so we use the exact

 * same type description for export as for import.  Other providers might

 * choose to import full keys, but only export the public parts, and will

 * therefore have the importkey_types and importkey_types functions return

 * different arrays.

 */

static const OSSL_PARAM rsa_key_types[] = {

    RSA_KEY_TYPES()

    OSSL_PARAM_END

};

/*

 * We lied about the amount of factors, exponents and coefficients, the

 * export and import functions can really deal with an infinite amount

 * of these numbers.  However, RSA keys with too many primes are futile,

 * so we at least pretend to have some limits.

 */

static const OSSL_PARAM *rsa_imexport_types(int selection)

{

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)

        return rsa_key_types;

    return NULL;

}

static const OSSL_PARAM *rsa_import_types(int selection)

{

    return rsa_imexport_types(selection);

}

static const OSSL_PARAM *rsa_export_types(int selection)

{

    return rsa_imexport_types(selection);

}

static int rsa_get_params(void *key, OSSL_PARAM params[])

{

    RSA *rsa = key;

    const RSA_PSS_PARAMS_30 *pss_params = ossl_rsa_get0_pss_params_30(rsa);

    int rsa_type = RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK);

    OSSL_PARAM *p;

    int empty = RSA_get0_n(rsa) == NULL;

    if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL

        && (empty || !OSSL_PARAM_set_int(p, RSA_bits(rsa))))

        return 0;

    if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL

        && (empty || !OSSL_PARAM_set_int(p, RSA_security_bits(rsa))))

        return 0;

    if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL

        && (empty || !OSSL_PARAM_set_int(p, RSA_size(rsa))))

        return 0;

    /*

     * For restricted RSA-PSS keys, we ignore the default digest request.

     * With RSA-OAEP keys, this may need to be amended.

     */

    if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL

        && (rsa_type != RSA_FLAG_TYPE_RSASSAPSS

            || ossl_rsa_pss_params_30_is_unrestricted(pss_params))) {

        if (!OSSL_PARAM_set_utf8_string(p, RSA_DEFAULT_MD))

            return 0;

    }

    /*

     * For non-RSA-PSS keys, we ignore the mandatory digest request.

     * With RSA-OAEP keys, this may need to be amended.

     */

    if ((p = OSSL_PARAM_locate(params,

                               OSSL_PKEY_PARAM_MANDATORY_DIGEST)) != NULL

        && rsa_type == RSA_FLAG_TYPE_RSASSAPSS

        && !ossl_rsa_pss_params_30_is_unrestricted(pss_params)) {

        const char *mdname =

            ossl_rsa_oaeppss_nid2name(ossl_rsa_pss_params_30_hashalg(pss_params));

        if (mdname == NULL || !OSSL_PARAM_set_utf8_string(p, mdname))

            return 0;

    }

    return (rsa_type != RSA_FLAG_TYPE_RSASSAPSS

            || ossl_rsa_pss_params_30_todata(pss_params, NULL, params))

        && ossl_rsa_todata(rsa, NULL, params, 1);

}

static const OSSL_PARAM rsa_params[] = {

    OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),

    OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),

    OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),

    OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),

    RSA_KEY_TYPES()

    OSSL_PARAM_END

};

static const OSSL_PARAM *rsa_gettable_params(void *provctx)

{

    return rsa_params;

}

static int rsa_validate(const void *keydata, int selection, int checktype)

{

    const RSA *rsa = keydata;

    int ok = 1;

    if (!ossl_prov_is_running())

        return 0;

    if ((selection & RSA_POSSIBLE_SELECTIONS) == 0)

        return 1; /* nothing to validate */

    /* If the whole key is selected, we do a pairwise validation */

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)

        == OSSL_KEYMGMT_SELECT_KEYPAIR) {

        ok = ok && ossl_rsa_validate_pairwise(rsa);

    } else {

        if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)

            ok = ok && ossl_rsa_validate_private(rsa);

        if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)

            ok = ok && ossl_rsa_validate_public(rsa);

    }

    return ok;

}

struct rsa_gen_ctx {

    OSSL_LIB_CTX *libctx;

    const char *propq;

    int rsa_type;

    size_t nbits;

    BIGNUM *pub_exp;

    size_t primes;

    /* For PSS */

    RSA_PSS_PARAMS_30 pss_params;

    int pss_defaults_set;

    /* For generation callback */

    OSSL_CALLBACK *cb;

    void *cbarg;

#if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)

    /* ACVP test parameters */

    OSSL_PARAM *acvp_test_params;

#endif

};

static int rsa_gencb(int p, int n, BN_GENCB *cb)

{

    struct rsa_gen_ctx *gctx = BN_GENCB_get_arg(cb);

    OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };

    params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);

    params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);

    return gctx->cb(params, gctx->cbarg);

}

static void *gen_init(void *provctx, int selection, int rsa_type,

                      const OSSL_PARAM params[])

{

    OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);

    struct rsa_gen_ctx *gctx = NULL;

    if (!ossl_prov_is_running())

        return NULL;

    if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)

        return NULL;

    if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {

        gctx->libctx = libctx;

        if ((gctx->pub_exp = BN_new()) == NULL

            || !BN_set_word(gctx->pub_exp, RSA_F4)) {

            goto err;

        }

        gctx->nbits = 2048;

        gctx->primes = RSA_DEFAULT_PRIME_NUM;

        gctx->rsa_type = rsa_type;

    } else {

        goto err;

    }

    if (!rsa_gen_set_params(gctx, params))

        goto err;

    return gctx;

err:

    if (gctx != NULL)

        BN_free(gctx->pub_exp);

    OPENSSL_free(gctx);

    return NULL;

}

static void *rsa_gen_init(void *provctx, int selection,

                          const OSSL_PARAM params[])

{

    return gen_init(provctx, selection, RSA_FLAG_TYPE_RSA, params);

}

static void *rsapss_gen_init(void *provctx, int selection,

                             const OSSL_PARAM params[])

{

    return gen_init(provctx, selection, RSA_FLAG_TYPE_RSASSAPSS, params);

}

/*

 * This function is common for all RSA sub-types, to detect possible

 * misuse, such as PSS parameters being passed when a plain RSA key

 * is generated.

 */

static int rsa_gen_set_params(void *genctx, const OSSL_PARAM params[])

{

    struct rsa_gen_ctx *gctx = genctx;

    const OSSL_PARAM *p;

    if (ossl_param_is_empty(params))

        return 1;

    if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_BITS)) != NULL) {

        if (!OSSL_PARAM_get_size_t(p, &gctx->nbits))

            return 0;

        if (gctx->nbits < RSA_MIN_MODULUS_BITS) {

            ERR_raise(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL);

            return 0;

        }

    }

    if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_PRIMES)) != NULL

        && !OSSL_PARAM_get_size_t(p, &gctx->primes))

        return 0;

    if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E)) != NULL

        && !OSSL_PARAM_get_BN(p, &gctx->pub_exp))

        return 0;

    /* Only attempt to get PSS parameters when generating an RSA-PSS key */

    if (gctx->rsa_type == RSA_FLAG_TYPE_RSASSAPSS

        && !pss_params_fromdata(&gctx->pss_params, &gctx->pss_defaults_set, params,

                                gctx->rsa_type, gctx->libctx))

        return 0;

#if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)

    /* Any ACVP test related parameters are copied into a params[] */

    if (!ossl_rsa_acvp_test_gen_params_new(&gctx->acvp_test_params, params))

        return 0;

#endif

    return 1;

}

#define rsa_gen_basic                                           \

    OSSL_PARAM_size_t(OSSL_PKEY_PARAM_RSA_BITS, NULL),          \

    OSSL_PARAM_size_t(OSSL_PKEY_PARAM_RSA_PRIMES, NULL),        \

    OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0)

/*

 * The following must be kept in sync with ossl_rsa_pss_params_30_fromdata()

 * in crypto/rsa/rsa_backend.c

 */

#define rsa_gen_pss                                                     \

    OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_DIGEST, NULL, 0),        \

    OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_DIGEST_PROPS, NULL, 0),  \

    OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_MASKGENFUNC, NULL, 0),   \

    OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_RSA_MGF1_DIGEST, NULL, 0),   \

    OSSL_PARAM_int(OSSL_PKEY_PARAM_RSA_PSS_SALTLEN, NULL)

static const OSSL_PARAM *rsa_gen_settable_params(ossl_unused void *genctx,

                                                 ossl_unused void *provctx)

{

    static OSSL_PARAM settable[] = {

        rsa_gen_basic,

        OSSL_PARAM_END

    };

    return settable;

}

static const OSSL_PARAM *rsapss_gen_settable_params(ossl_unused void *genctx,

                                                    ossl_unused void *provctx)

{

    static OSSL_PARAM settable[] = {

        rsa_gen_basic,

        rsa_gen_pss,

        OSSL_PARAM_END

    };

    return settable;

}

static void *rsa_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)

{

    struct rsa_gen_ctx *gctx = genctx;

    RSA *rsa = NULL, *rsa_tmp = NULL;

    BN_GENCB *gencb = NULL;

    if (!ossl_prov_is_running() || gctx == NULL)

        return NULL;

    switch (gctx->rsa_type) {

    case RSA_FLAG_TYPE_RSA:

        /* For plain RSA keys, PSS parameters must not be set */

        if (!ossl_rsa_pss_params_30_is_unrestricted(&gctx->pss_params))

            goto err;

        break;

    case RSA_FLAG_TYPE_RSASSAPSS:

        /*

         * For plain RSA-PSS keys, PSS parameters may be set but don't have

         * to, so not check.

         */

        break;

    default:

        /* Unsupported RSA key sub-type... */

        return NULL;

    }

    if ((rsa_tmp = ossl_rsa_new_with_ctx(gctx->libctx)) == NULL)

        return NULL;

    gctx->cb = osslcb;

    gctx->cbarg = cbarg;

    gencb = BN_GENCB_new();

    if (gencb != NULL)

        BN_GENCB_set(gencb, rsa_gencb, genctx);

#if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)

    if (gctx->acvp_test_params != NULL) {

        if (!ossl_rsa_acvp_test_set_params(rsa_tmp, gctx->acvp_test_params))

            goto err;

    }

#endif

    if (!RSA_generate_multi_prime_key(rsa_tmp,

                                      (int)gctx->nbits, (int)gctx->primes,

                                      gctx->pub_exp, gencb))

        goto err;

    if (!ossl_rsa_pss_params_30_copy(ossl_rsa_get0_pss_params_30(rsa_tmp),

                                     &gctx->pss_params))

        goto err;

    RSA_clear_flags(rsa_tmp, RSA_FLAG_TYPE_MASK);

    RSA_set_flags(rsa_tmp, gctx->rsa_type);

    rsa = rsa_tmp;

    rsa_tmp = NULL;

 err:

    BN_GENCB_free(gencb);

    RSA_free(rsa_tmp);

    return rsa;

}

static void rsa_gen_cleanup(void *genctx)

{

    struct rsa_gen_ctx *gctx = genctx;

    if (gctx == NULL)

        return;

#if defined(FIPS_MODULE) && !defined(OPENSSL_NO_ACVP_TESTS)

    ossl_rsa_acvp_test_gen_params_free(gctx->acvp_test_params);

    gctx->acvp_test_params = NULL;

#endif

    BN_clear_free(gctx->pub_exp);

    OPENSSL_free(gctx);

}

static void *common_load(const void *reference, size_t reference_sz,

                         int expected_rsa_type)

{

    RSA *rsa = NULL;

    if (ossl_prov_is_running() && reference_sz == sizeof(rsa)) {

        /* The contents of the reference is the address to our object */

        rsa = *(RSA **)reference;

        if (RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK) != expected_rsa_type)

            return NULL;

        /* We grabbed, so we detach it */

        *(RSA **)reference = NULL;

        return rsa;

    }

    return NULL;

}

static void *rsa_load(const void *reference, size_t reference_sz)

{

    return common_load(reference, reference_sz, RSA_FLAG_TYPE_RSA);

}

static void *rsapss_load(const void *reference, size_t reference_sz)

{

    return common_load(reference, reference_sz, RSA_FLAG_TYPE_RSASSAPSS);

}

static void *rsa_dup(const void *keydata_from, int selection)

{

    if (ossl_prov_is_running()

        /* do not allow creating empty keys by duplication */

        && (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)

        return ossl_rsa_dup(keydata_from, selection);

    return NULL;

}

/* For any RSA key, we use the "RSA" algorithms regardless of sub-type. */

static const char *rsa_query_operation_name(int operation_id)

{

    return "RSA";

}

const OSSL_DISPATCH ossl_rsa_keymgmt_functions[] = {

    { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))rsa_newdata },

    { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))rsa_gen_init },

    { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS,

      (void (*)(void))rsa_gen_set_params },

    { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,

      (void (*)(void))rsa_gen_settable_params },

    { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))rsa_gen },

    { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))rsa_gen_cleanup },

    { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))rsa_load },

    { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))rsa_freedata },

    { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))rsa_get_params },

    { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))rsa_gettable_params },

    { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))rsa_has },

    { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))rsa_match },

    { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))rsa_validate },

    { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))rsa_import },

    { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))rsa_import_types },

    { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))rsa_export },

    { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))rsa_export_types },

    { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))rsa_dup },

    OSSL_DISPATCH_END

};

const OSSL_DISPATCH ossl_rsapss_keymgmt_functions[] = {

    { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))rsapss_newdata },

    { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))rsapss_gen_init },

    { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))rsa_gen_set_params },

    { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,

      (void (*)(void))rsapss_gen_settable_params },

    { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))rsa_gen },

    { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))rsa_gen_cleanup },

    { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))rsapss_load },

    { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))rsa_freedata },

    { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))rsa_get_params },

    { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))rsa_gettable_params },

    { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))rsa_has },

    { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))rsa_match },

    { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))rsa_validate },

    { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))rsa_import },

    { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))rsa_import_types },

    { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))rsa_export },

    { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))rsa_export_types },

    { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,

      (void (*)(void))rsa_query_operation_name },

    { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))rsa_dup },

    OSSL_DISPATCH_END

};