/src/openssl/providers/implementations/asymciphers/rsa_enc.c

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/*
 * Copyright 2019-2021 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/crypto.h>
#include <openssl/evp.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/rsa.h>
#include <openssl/params.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
/* Just for SSL_MAX_MASTER_KEY_LENGTH */
#include <openssl/prov_ssl.h>
#include "internal/constant_time.h"
#include "internal/sizes.h"
#include "crypto/rsa.h"
#include "prov/provider_ctx.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#include "prov/securitycheck.h"

#include <stdlib.h>

static OSSL_FUNC_asym_cipher_newctx_fn rsa_newctx;
static OSSL_FUNC_asym_cipher_encrypt_init_fn rsa_encrypt_init;
static OSSL_FUNC_asym_cipher_encrypt_fn rsa_encrypt;
static OSSL_FUNC_asym_cipher_decrypt_init_fn rsa_decrypt_init;
static OSSL_FUNC_asym_cipher_decrypt_fn rsa_decrypt;
static OSSL_FUNC_asym_cipher_freectx_fn rsa_freectx;
static OSSL_FUNC_asym_cipher_dupctx_fn rsa_dupctx;
static OSSL_FUNC_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
static OSSL_FUNC_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
static OSSL_FUNC_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
static OSSL_FUNC_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;

static OSSL_ITEM padding_item[] = {
    { RSA_PKCS1_PADDING,        OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
    { RSA_NO_PADDING,           OSSL_PKEY_RSA_PAD_MODE_NONE },
    { RSA_PKCS1_OAEP_PADDING,   OSSL_PKEY_RSA_PAD_MODE_OAEP }, /* Correct spelling first */
    { RSA_PKCS1_OAEP_PADDING,   "oeap"   },
    { RSA_X931_PADDING,         OSSL_PKEY_RSA_PAD_MODE_X931 },
    { 0,                        NULL     }
};

/*
 * What's passed as an actual key is defined by the KEYMGMT interface.
 * We happen to know that our KEYMGMT simply passes RSA structures, so
 * we use that here too.
 */

typedef struct {
    OSSL_LIB_CTX *libctx;
    RSA *rsa;
    int pad_mode;
    int operation;
    /* OAEP message digest */
    EVP_MD *oaep_md;
    /* message digest for MGF1 */
    EVP_MD *mgf1_md;
    /* OAEP label */
    unsigned char *oaep_label;
    size_t oaep_labellen;
    /* TLS padding */
    unsigned int client_version;
    unsigned int alt_version;
    /* PKCS#1 v1.5 decryption mode */
    unsigned int implicit_rejection;
} PROV_RSA_CTX;

static void *rsa_newctx(void *provctx)
{
    PROV_RSA_CTX *prsactx;

    if (!ossl_prov_is_running())
        return NULL;
    prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
    if (prsactx == NULL)
        return NULL;
    prsactx->libctx = PROV_LIBCTX_OF(provctx);

    return prsactx;
}

static int rsa_init(void *vprsactx, void *vrsa, const OSSL_PARAM params[],
                    int operation)
{
    PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;

    if (!ossl_prov_is_running() || prsactx == NULL || vrsa == NULL)
        return 0;

    if (!ossl_rsa_check_key(prsactx->libctx, vrsa, operation))
        return 0;

    if (!RSA_up_ref(vrsa))
        return 0;
    RSA_free(prsactx->rsa);
    prsactx->rsa = vrsa;
    prsactx->operation = operation;
    prsactx->implicit_rejection = 1;

    switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
    case RSA_FLAG_TYPE_RSA:
        prsactx->pad_mode = RSA_PKCS1_PADDING;
        break;
    default:
        /* This should not happen due to the check above */
        ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    return rsa_set_ctx_params(prsactx, params);
}

static int rsa_encrypt_init(void *vprsactx, void *vrsa,
                            const OSSL_PARAM params[])
{
    return rsa_init(vprsactx, vrsa, params, EVP_PKEY_OP_ENCRYPT);
}

static int rsa_decrypt_init(void *vprsactx, void *vrsa,
                            const OSSL_PARAM params[])
{
    return rsa_init(vprsactx, vrsa, params, EVP_PKEY_OP_DECRYPT);
}

static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
                       size_t outsize, const unsigned char *in, size_t inlen)
{
    PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
    int ret;

    if (!ossl_prov_is_running())
        return 0;

    if (out == NULL) {
        size_t len = RSA_size(prsactx->rsa);

        if (len == 0) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
            return 0;
        }
        *outlen = len;
        return 1;
    }

    if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
        int rsasize = RSA_size(prsactx->rsa);
        unsigned char *tbuf;

        if ((tbuf = OPENSSL_malloc(rsasize)) == NULL)
            return 0;
        if (prsactx->oaep_md == NULL) {
            OPENSSL_free(tbuf);
            prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
            ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        ret =
            ossl_rsa_padding_add_PKCS1_OAEP_mgf1_ex(prsactx->libctx, tbuf,
                                                    rsasize, in, inlen,
                                                    prsactx->oaep_label,
                                                    prsactx->oaep_labellen,
                                                    prsactx->oaep_md,
                                                    prsactx->mgf1_md);

        if (!ret) {
            OPENSSL_free(tbuf);
            return 0;
        }
        ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
                                 RSA_NO_PADDING);
        OPENSSL_free(tbuf);
    } else {
        ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
                                 prsactx->pad_mode);
    }
    /* A ret value of 0 is not an error */
    if (ret < 0)
        return ret;
    *outlen = ret;
    return 1;
}

static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
                       size_t outsize, const unsigned char *in, size_t inlen)
{
    PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
    int ret;
    int pad_mode;
    size_t len = RSA_size(prsactx->rsa);

    if (!ossl_prov_is_running())
        return 0;

    if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
        if (out == NULL) {
            *outlen = SSL_MAX_MASTER_KEY_LENGTH;
            return 1;
        }
        if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
            ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
            return 0;
        }
    } else {
        if (out == NULL) {
            if (len == 0) {
                ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
                return 0;
            }
            *outlen = len;
            return 1;
        }

        if (outsize < len) {
            ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
            return 0;
        }
    }

    if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
            || prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
        unsigned char *tbuf;

        if ((tbuf = OPENSSL_malloc(len)) == NULL)
            return 0;
        ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
                                  RSA_NO_PADDING);
        /*
         * With no padding then, on success ret should be len, otherwise an
         * error occurred (non-constant time)
         */
        if (ret != (int)len) {
            OPENSSL_free(tbuf);
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
            return 0;
        }
        if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
            if (prsactx->oaep_md == NULL) {
                prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
                if (prsactx->oaep_md == NULL) {
                    OPENSSL_free(tbuf);
                    ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
                    return 0;
                }
            }
            ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
                                                    len, len,
                                                    prsactx->oaep_label,
                                                    prsactx->oaep_labellen,
                                                    prsactx->oaep_md,
                                                    prsactx->mgf1_md);
        } else {
            /* RSA_PKCS1_WITH_TLS_PADDING */
            if (prsactx->client_version <= 0) {
                ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
                OPENSSL_free(tbuf);
                return 0;
            }
            ret = ossl_rsa_padding_check_PKCS1_type_2_TLS(
                        prsactx->libctx, out, outsize, tbuf, len,
                        prsactx->client_version, prsactx->alt_version);
        }
        OPENSSL_free(tbuf);
    } else {
        if ((prsactx->implicit_rejection == 0) &&
                (prsactx->pad_mode == RSA_PKCS1_PADDING))
            pad_mode = RSA_PKCS1_NO_IMPLICIT_REJECT_PADDING;
        else
            pad_mode = prsactx->pad_mode;
        ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa, pad_mode);
    }
    *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
    ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
    return ret;
}

static void rsa_freectx(void *vprsactx)
{
    PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;

    RSA_free(prsactx->rsa);

    EVP_MD_free(prsactx->oaep_md);
    EVP_MD_free(prsactx->mgf1_md);
    OPENSSL_free(prsactx->oaep_label);

    OPENSSL_free(prsactx);
}

static void *rsa_dupctx(void *vprsactx)
{
    PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
    PROV_RSA_CTX *dstctx;

    if (!ossl_prov_is_running())
        return NULL;

    dstctx = OPENSSL_zalloc(sizeof(*srcctx));
    if (dstctx == NULL)
        return NULL;

    *dstctx = *srcctx;
    if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
        OPENSSL_free(dstctx);
        return NULL;
    }

    if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
        RSA_free(dstctx->rsa);
        OPENSSL_free(dstctx);
        return NULL;
    }

    if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
        RSA_free(dstctx->rsa);
        EVP_MD_free(dstctx->oaep_md);
        OPENSSL_free(dstctx);
        return NULL;
    }

    return dstctx;
}

static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
{
    PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
    OSSL_PARAM *p;

    if (prsactx == NULL)
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
    if (p != NULL)
        switch (p->data_type) {
        case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
            if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
                return 0;
            break;
        case OSSL_PARAM_UTF8_STRING:
            {
                int i;
                const char *word = NULL;

                for (i = 0; padding_item[i].id != 0; i++) {
                    if (prsactx->pad_mode == (int)padding_item[i].id) {
                        word = padding_item[i].ptr;
                        break;
                    }
                }

                if (word != NULL) {
                    if (!OSSL_PARAM_set_utf8_string(p, word))
                        return 0;
                } else {
                    ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
                }
            }
            break;
        default:
            return 0;
        }

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
    if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
                                                    ? ""
                                                    : EVP_MD_get0_name(prsactx->oaep_md)))
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
    if (p != NULL) {
        EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
                                                   : prsactx->mgf1_md;

        if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
                                           ? ""
                                           : EVP_MD_get0_name(mgf1_md)))
        return 0;
    }

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
    if (p != NULL &&
        !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label,
                                  prsactx->oaep_labellen))
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
    if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
    if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
    if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->implicit_rejection))
        return 0;

    return 1;
}

static const OSSL_PARAM known_gettable_ctx_params[] = {
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
    OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
                    NULL, 0),
    OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
    OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
    OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
    OSSL_PARAM_END
};

static const OSSL_PARAM *rsa_gettable_ctx_params(ossl_unused void *vprsactx,
                                                 ossl_unused void *provctx)
{
    return known_gettable_ctx_params;
}

static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
{
    PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
    const OSSL_PARAM *p;
    char mdname[OSSL_MAX_NAME_SIZE];
    char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
    char *str = NULL;

    if (prsactx == NULL)
        return 0;
    if (params == NULL)
        return 1;

    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
    if (p != NULL) {
        str = mdname;
        if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
            return 0;

        p = OSSL_PARAM_locate_const(params,
                                    OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
        if (p != NULL) {
            str = mdprops;
            if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
                return 0;
        }

        EVP_MD_free(prsactx->oaep_md);
        prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);

        if (prsactx->oaep_md == NULL)
            return 0;
    }

    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
    if (p != NULL) {
        int pad_mode = 0;

        switch (p->data_type) {
        case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
            if (!OSSL_PARAM_get_int(p, &pad_mode))
                return 0;
            break;
        case OSSL_PARAM_UTF8_STRING:
            {
                int i;

                if (p->data == NULL)
                    return 0;

                for (i = 0; padding_item[i].id != 0; i++) {
                    if (strcmp(p->data, padding_item[i].ptr) == 0) {
                        pad_mode = padding_item[i].id;
                        break;
                    }
                }
            }
            break;
        default:
            return 0;
        }

        /*
         * PSS padding is for signatures only so is not compatible with
         * asymmetric cipher use.
         */
        if (pad_mode == RSA_PKCS1_PSS_PADDING)
            return 0;
        if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
            prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
            if (prsactx->oaep_md == NULL)
                return 0;
        }
        prsactx->pad_mode = pad_mode;
    }

    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
    if (p != NULL) {
        str = mdname;
        if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
            return 0;

        p = OSSL_PARAM_locate_const(params,
                                    OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
        if (p != NULL) {
            str = mdprops;
            if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
                return 0;
        } else {
            str = NULL;
        }

        EVP_MD_free(prsactx->mgf1_md);
        prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);

        if (prsactx->mgf1_md == NULL)
            return 0;
    }

    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
    if (p != NULL) {
        void *tmp_label = NULL;
        size_t tmp_labellen;

        if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
            return 0;
        OPENSSL_free(prsactx->oaep_label);
        prsactx->oaep_label = (unsigned char *)tmp_label;
        prsactx->oaep_labellen = tmp_labellen;
    }

    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
    if (p != NULL) {
        unsigned int client_version;

        if (!OSSL_PARAM_get_uint(p, &client_version))
            return 0;
        prsactx->client_version = client_version;
    }

    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
    if (p != NULL) {
        unsigned int alt_version;

        if (!OSSL_PARAM_get_uint(p, &alt_version))
            return 0;
        prsactx->alt_version = alt_version;
    }
    p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
    if (p != NULL) {
        unsigned int implicit_rejection;

        if (!OSSL_PARAM_get_uint(p, &implicit_rejection))
            return 0;
        prsactx->implicit_rejection = implicit_rejection;
    }

    return 1;
}

static const OSSL_PARAM known_settable_ctx_params[] = {
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
    OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
    OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
    OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
    OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
    OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
    OSSL_PARAM_END
};

static const OSSL_PARAM *rsa_settable_ctx_params(ossl_unused void *vprsactx,
                                                 ossl_unused void *provctx)
{
    return known_settable_ctx_params;
}

const OSSL_DISPATCH ossl_rsa_asym_cipher_functions[] = {
    { OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
    { OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_encrypt_init },
    { OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
    { OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_decrypt_init },
    { OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
    { OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
    { OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
    { OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
      (void (*)(void))rsa_get_ctx_params },
    { OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
      (void (*)(void))rsa_gettable_ctx_params },
    { OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
      (void (*)(void))rsa_set_ctx_params },
    { OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
      (void (*)(void))rsa_settable_ctx_params },
    { 0, NULL }
};

Coverage Report

Created: 2023-04-12 06:23

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		/*
11		* RSA low level APIs are deprecated for public use, but still ok for
12		* internal use.
13		*/
14		#include "internal/deprecated.h"
15
16		#include <openssl/crypto.h>
17		#include <openssl/evp.h>
18		#include <openssl/core_dispatch.h>
19		#include <openssl/core_names.h>
20		#include <openssl/rsa.h>
21		#include <openssl/params.h>
22		#include <openssl/err.h>
23		#include <openssl/proverr.h>
24		/* Just for SSL_MAX_MASTER_KEY_LENGTH */
25		#include <openssl/prov_ssl.h>
26		#include "internal/constant_time.h"
27		#include "internal/sizes.h"
28		#include "crypto/rsa.h"
29		#include "prov/provider_ctx.h"
30		#include "prov/implementations.h"
31		#include "prov/providercommon.h"
32		#include "prov/securitycheck.h"
33
34		#include <stdlib.h>
35
36		static OSSL_FUNC_asym_cipher_newctx_fn rsa_newctx;
37		static OSSL_FUNC_asym_cipher_encrypt_init_fn rsa_encrypt_init;
38		static OSSL_FUNC_asym_cipher_encrypt_fn rsa_encrypt;
39		static OSSL_FUNC_asym_cipher_decrypt_init_fn rsa_decrypt_init;
40		static OSSL_FUNC_asym_cipher_decrypt_fn rsa_decrypt;
41		static OSSL_FUNC_asym_cipher_freectx_fn rsa_freectx;
42		static OSSL_FUNC_asym_cipher_dupctx_fn rsa_dupctx;
43		static OSSL_FUNC_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
44		static OSSL_FUNC_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
45		static OSSL_FUNC_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
46		static OSSL_FUNC_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
47
48		static OSSL_ITEM padding_item[] = {
49		{ RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
50		{ RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
51		{ RSA_PKCS1_OAEP_PADDING, OSSL_PKEY_RSA_PAD_MODE_OAEP }, /* Correct spelling first */
52		{ RSA_PKCS1_OAEP_PADDING, "oeap" },
53		{ RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
54		{ 0, NULL }
55		};
56
57		/*
58		* What's passed as an actual key is defined by the KEYMGMT interface.
59		* We happen to know that our KEYMGMT simply passes RSA structures, so
60		* we use that here too.
61		*/
62
63		typedef struct {
64		OSSL_LIB_CTX *libctx;
65		RSA *rsa;
66		int pad_mode;
67		int operation;
68		/* OAEP message digest */
69		EVP_MD *oaep_md;
70		/* message digest for MGF1 */
71		EVP_MD *mgf1_md;
72		/* OAEP label */
73		unsigned char *oaep_label;
74		size_t oaep_labellen;
75		/* TLS padding */
76		unsigned int client_version;
77		unsigned int alt_version;
78		/* PKCS#1 v1.5 decryption mode */
79		unsigned int implicit_rejection;
80		} PROV_RSA_CTX;
81
82		static void rsa_newctx(void provctx)
83	0	{
84	0	PROV_RSA_CTX *prsactx;
85
86	0	if (!ossl_prov_is_running())
87	0	return NULL;
88	0	prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
89	0	if (prsactx == NULL)
90	0	return NULL;
91	0	prsactx->libctx = PROV_LIBCTX_OF(provctx);
92
93	0	return prsactx;
94	0	}
95
96		static int rsa_init(void vprsactx, void vrsa, const OSSL_PARAM params[],
97		int operation)
98	0	{
99	0	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
100
101	0	if (!ossl_prov_is_running() \|\| prsactx == NULL \|\| vrsa == NULL)
102	0	return 0;
103
104	0	if (!ossl_rsa_check_key(prsactx->libctx, vrsa, operation))
105	0	return 0;
106
107	0	if (!RSA_up_ref(vrsa))
108	0	return 0;
109	0	RSA_free(prsactx->rsa);
110	0	prsactx->rsa = vrsa;
111	0	prsactx->operation = operation;
112	0	prsactx->implicit_rejection = 1;
113
114	0	switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
115	0	case RSA_FLAG_TYPE_RSA:
116	0	prsactx->pad_mode = RSA_PKCS1_PADDING;
117	0	break;
118	0	default:
119		/* This should not happen due to the check above */
120	0	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
121	0	return 0;
122	0	}
123	0	return rsa_set_ctx_params(prsactx, params);
124	0	}
125
126		static int rsa_encrypt_init(void vprsactx, void vrsa,
127		const OSSL_PARAM params[])
128	0	{
129	0	return rsa_init(vprsactx, vrsa, params, EVP_PKEY_OP_ENCRYPT);
130	0	}
131
132		static int rsa_decrypt_init(void vprsactx, void vrsa,
133		const OSSL_PARAM params[])
134	0	{
135	0	return rsa_init(vprsactx, vrsa, params, EVP_PKEY_OP_DECRYPT);
136	0	}
137
138		static int rsa_encrypt(void vprsactx, unsigned char out, size_t *outlen,
139		size_t outsize, const unsigned char *in, size_t inlen)
140	0	{
141	0	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
142	0	int ret;
143
144	0	if (!ossl_prov_is_running())
145	0	return 0;
146
147	0	if (out == NULL) {
148	0	size_t len = RSA_size(prsactx->rsa);
149
150	0	if (len == 0) {
151	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
152	0	return 0;
153	0	}
154	0	*outlen = len;
155	0	return 1;
156	0	}
157
158	0	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
159	0	int rsasize = RSA_size(prsactx->rsa);
160	0	unsigned char *tbuf;
161
162	0	if ((tbuf = OPENSSL_malloc(rsasize)) == NULL)
163	0	return 0;
164	0	if (prsactx->oaep_md == NULL) {
165	0	OPENSSL_free(tbuf);
166	0	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
167	0	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
168	0	return 0;
169	0	}
170	0	ret =
171	0	ossl_rsa_padding_add_PKCS1_OAEP_mgf1_ex(prsactx->libctx, tbuf,
172	0	rsasize, in, inlen,
173	0	prsactx->oaep_label,
174	0	prsactx->oaep_labellen,
175	0	prsactx->oaep_md,
176	0	prsactx->mgf1_md);
177
178	0	if (!ret) {
179	0	OPENSSL_free(tbuf);
180	0	return 0;
181	0	}
182	0	ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
183	0	RSA_NO_PADDING);
184	0	OPENSSL_free(tbuf);
185	0	} else {
186	0	ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
187	0	prsactx->pad_mode);
188	0	}
189		/* A ret value of 0 is not an error */
190	0	if (ret < 0)
191	0	return ret;
192	0	*outlen = ret;
193	0	return 1;
194	0	}
195
196		static int rsa_decrypt(void vprsactx, unsigned char out, size_t *outlen,
197		size_t outsize, const unsigned char *in, size_t inlen)
198	0	{
199	0	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
200	0	int ret;
201	0	int pad_mode;
202	0	size_t len = RSA_size(prsactx->rsa);
203
204	0	if (!ossl_prov_is_running())
205	0	return 0;
206
207	0	if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
208	0	if (out == NULL) {
209	0	*outlen = SSL_MAX_MASTER_KEY_LENGTH;
210	0	return 1;
211	0	}
212	0	if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
213	0	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
214	0	return 0;
215	0	}
216	0	} else {
217	0	if (out == NULL) {
218	0	if (len == 0) {
219	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
220	0	return 0;
221	0	}
222	0	*outlen = len;
223	0	return 1;
224	0	}
225
226	0	if (outsize < len) {
227	0	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
228	0	return 0;
229	0	}
230	0	}
231
232	0	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
233	0	\|\| prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
234	0	unsigned char *tbuf;
235
236	0	if ((tbuf = OPENSSL_malloc(len)) == NULL)
237	0	return 0;
238	0	ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
239	0	RSA_NO_PADDING);
240		/*
241		* With no padding then, on success ret should be len, otherwise an
242		* error occurred (non-constant time)
243		*/
244	0	if (ret != (int)len) {
245	0	OPENSSL_free(tbuf);
246	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
247	0	return 0;
248	0	}
249	0	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
250	0	if (prsactx->oaep_md == NULL) {
251	0	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
252	0	if (prsactx->oaep_md == NULL) {
253	0	OPENSSL_free(tbuf);
254	0	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
255	0	return 0;
256	0	}
257	0	}
258	0	ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
259	0	len, len,
260	0	prsactx->oaep_label,
261	0	prsactx->oaep_labellen,
262	0	prsactx->oaep_md,
263	0	prsactx->mgf1_md);
264	0	} else {
265		/* RSA_PKCS1_WITH_TLS_PADDING */
266	0	if (prsactx->client_version <= 0) {
267	0	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
268	0	OPENSSL_free(tbuf);
269	0	return 0;
270	0	}
271	0	ret = ossl_rsa_padding_check_PKCS1_type_2_TLS(
272	0	prsactx->libctx, out, outsize, tbuf, len,
273	0	prsactx->client_version, prsactx->alt_version);
274	0	}
275	0	OPENSSL_free(tbuf);
276	0	} else {
277	0	if ((prsactx->implicit_rejection == 0) &&
278	0	(prsactx->pad_mode == RSA_PKCS1_PADDING))
279	0	pad_mode = RSA_PKCS1_NO_IMPLICIT_REJECT_PADDING;
280	0	else
281	0	pad_mode = prsactx->pad_mode;
282	0	ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa, pad_mode);
283	0	}
284	0	outlen = constant_time_select_s(constant_time_msb_s(ret), outlen, ret);
285	0	ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
286	0	return ret;
287	0	}
288
289		static void rsa_freectx(void *vprsactx)
290	0	{
291	0	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
292
293	0	RSA_free(prsactx->rsa);
294
295	0	EVP_MD_free(prsactx->oaep_md);
296	0	EVP_MD_free(prsactx->mgf1_md);
297	0	OPENSSL_free(prsactx->oaep_label);
298
299	0	OPENSSL_free(prsactx);
300	0	}
301
302		static void rsa_dupctx(void vprsactx)
303	0	{
304	0	PROV_RSA_CTX srcctx = (PROV_RSA_CTX )vprsactx;
305	0	PROV_RSA_CTX *dstctx;
306
307	0	if (!ossl_prov_is_running())
308	0	return NULL;
309
310	0	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
311	0	if (dstctx == NULL)
312	0	return NULL;
313
314	0	dstctx = srcctx;
315	0	if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
316	0	OPENSSL_free(dstctx);
317	0	return NULL;
318	0	}
319
320	0	if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
321	0	RSA_free(dstctx->rsa);
322	0	OPENSSL_free(dstctx);
323	0	return NULL;
324	0	}
325
326	0	if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
327	0	RSA_free(dstctx->rsa);
328	0	EVP_MD_free(dstctx->oaep_md);
329	0	OPENSSL_free(dstctx);
330	0	return NULL;
331	0	}
332
333	0	return dstctx;
334	0	}
335
336		static int rsa_get_ctx_params(void vprsactx, OSSL_PARAM params)
337	0	{
338	0	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
339	0	OSSL_PARAM *p;
340
341	0	if (prsactx == NULL)
342	0	return 0;
343
344	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
345	0	if (p != NULL)
346	0	switch (p->data_type) {
347	0	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
348	0	if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
349	0	return 0;
350	0	break;
351	0	case OSSL_PARAM_UTF8_STRING:
352	0	{
353	0	int i;
354	0	const char *word = NULL;
355
356	0	for (i = 0; padding_item[i].id != 0; i++) {
357	0	if (prsactx->pad_mode == (int)padding_item[i].id) {
358	0	word = padding_item[i].ptr;
359	0	break;
360	0	}
361	0	}
362
363	0	if (word != NULL) {
364	0	if (!OSSL_PARAM_set_utf8_string(p, word))
365	0	return 0;
366	0	} else {
367	0	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
368	0	}
369	0	}
370	0	break;
371	0	default:
372	0	return 0;
373	0	}
374
375	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
376	0	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
377	0	? ""
378	0	: EVP_MD_get0_name(prsactx->oaep_md)))
379	0	return 0;
380
381	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
382	0	if (p != NULL) {
383	0	EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
384	0	: prsactx->mgf1_md;
385
386	0	if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
387	0	? ""
388	0	: EVP_MD_get0_name(mgf1_md)))
389	0	return 0;
390	0	}
391
392	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
393	0	if (p != NULL &&
394	0	!OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label,
395	0	prsactx->oaep_labellen))
396	0	return 0;
397
398	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
399	0	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
400	0	return 0;
401
402	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
403	0	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
404	0	return 0;
405
406	0	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
407	0	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->implicit_rejection))
408	0	return 0;
409
410	0	return 1;
411	0	}
412
413		static const OSSL_PARAM known_gettable_ctx_params[] = {
414		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
415		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
416		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
417		OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
418		NULL, 0),
419		OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
420		OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
421		OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
422		OSSL_PARAM_END
423		};
424
425		static const OSSL_PARAM rsa_gettable_ctx_params(ossl_unused void vprsactx,
426		ossl_unused void *provctx)
427	0	{
428	0	return known_gettable_ctx_params;
429	0	}
430
431		static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
432	0	{
433	0	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
434	0	const OSSL_PARAM *p;
435	0	char mdname[OSSL_MAX_NAME_SIZE];
436	0	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
437	0	char *str = NULL;
438
439	0	if (prsactx == NULL)
440	0	return 0;
441	0	if (params == NULL)
442	0	return 1;
443
444	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
445	0	if (p != NULL) {
446	0	str = mdname;
447	0	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
448	0	return 0;
449
450	0	p = OSSL_PARAM_locate_const(params,
451	0	OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
452	0	if (p != NULL) {
453	0	str = mdprops;
454	0	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
455	0	return 0;
456	0	}
457
458	0	EVP_MD_free(prsactx->oaep_md);
459	0	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
460
461	0	if (prsactx->oaep_md == NULL)
462	0	return 0;
463	0	}
464
465	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
466	0	if (p != NULL) {
467	0	int pad_mode = 0;
468
469	0	switch (p->data_type) {
470	0	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
471	0	if (!OSSL_PARAM_get_int(p, &pad_mode))
472	0	return 0;
473	0	break;
474	0	case OSSL_PARAM_UTF8_STRING:
475	0	{
476	0	int i;
477
478	0	if (p->data == NULL)
479	0	return 0;
480
481	0	for (i = 0; padding_item[i].id != 0; i++) {
482	0	if (strcmp(p->data, padding_item[i].ptr) == 0) {
483	0	pad_mode = padding_item[i].id;
484	0	break;
485	0	}
486	0	}
487	0	}
488	0	break;
489	0	default:
490	0	return 0;
491	0	}
492
493		/*
494		* PSS padding is for signatures only so is not compatible with
495		* asymmetric cipher use.
496		*/
497	0	if (pad_mode == RSA_PKCS1_PSS_PADDING)
498	0	return 0;
499	0	if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
500	0	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
501	0	if (prsactx->oaep_md == NULL)
502	0	return 0;
503	0	}
504	0	prsactx->pad_mode = pad_mode;
505	0	}
506
507	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
508	0	if (p != NULL) {
509	0	str = mdname;
510	0	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
511	0	return 0;
512
513	0	p = OSSL_PARAM_locate_const(params,
514	0	OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
515	0	if (p != NULL) {
516	0	str = mdprops;
517	0	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
518	0	return 0;
519	0	} else {
520	0	str = NULL;
521	0	}
522
523	0	EVP_MD_free(prsactx->mgf1_md);
524	0	prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
525
526	0	if (prsactx->mgf1_md == NULL)
527	0	return 0;
528	0	}
529
530	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
531	0	if (p != NULL) {
532	0	void *tmp_label = NULL;
533	0	size_t tmp_labellen;
534
535	0	if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
536	0	return 0;
537	0	OPENSSL_free(prsactx->oaep_label);
538	0	prsactx->oaep_label = (unsigned char *)tmp_label;
539	0	prsactx->oaep_labellen = tmp_labellen;
540	0	}
541
542	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
543	0	if (p != NULL) {
544	0	unsigned int client_version;
545
546	0	if (!OSSL_PARAM_get_uint(p, &client_version))
547	0	return 0;
548	0	prsactx->client_version = client_version;
549	0	}
550
551	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
552	0	if (p != NULL) {
553	0	unsigned int alt_version;
554
555	0	if (!OSSL_PARAM_get_uint(p, &alt_version))
556	0	return 0;
557	0	prsactx->alt_version = alt_version;
558	0	}
559	0	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
560	0	if (p != NULL) {
561	0	unsigned int implicit_rejection;
562
563	0	if (!OSSL_PARAM_get_uint(p, &implicit_rejection))
564	0	return 0;
565	0	prsactx->implicit_rejection = implicit_rejection;
566	0	}
567
568	0	return 1;
569	0	}
570
571		static const OSSL_PARAM known_settable_ctx_params[] = {
572		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
573		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
574		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
575		OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
576		OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
577		OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
578		OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
579		OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
580		OSSL_PARAM_END
581		};
582
583		static const OSSL_PARAM rsa_settable_ctx_params(ossl_unused void vprsactx,
584		ossl_unused void *provctx)
585	0	{
586	0	return known_settable_ctx_params;
587	0	}
588
589		const OSSL_DISPATCH ossl_rsa_asym_cipher_functions[] = {
590		{ OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
591		{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_encrypt_init },
592		{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
593		{ OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_decrypt_init },
594		{ OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
595		{ OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
596		{ OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
597		{ OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
598		(void (*)(void))rsa_get_ctx_params },
599		{ OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
600		(void (*)(void))rsa_gettable_ctx_params },
601		{ OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
602		(void (*)(void))rsa_set_ctx_params },
603		{ OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
604		(void (*)(void))rsa_settable_ctx_params },
605		{ 0, NULL }
606		};