[thirdparty/openssl.git] / providers / implementations / asymciphers / rsa_enc.c

/*
 * 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/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) {
            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 =
            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 },
    OSSL_DISPATCH_END
};
Commit	Line	Data
89abd1b6	1	/*
da1c088f	2	* Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
89abd1b6 MC	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
c5f87134 P	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
89abd1b6 MC	16	#include <openssl/crypto.h>
89abd1b6 MC	17	#include <openssl/evp.h>
23c48d94	18	#include <openssl/core_dispatch.h>
89abd1b6 MC	19	#include <openssl/core_names.h>
	20	#include <openssl/rsa.h>
	21	#include <openssl/params.h>
	22	#include <openssl/err.h>
2741128e	23	#include <openssl/proverr.h>
d9a75107	24	/* Just for SSL_MAX_MASTER_KEY_LENGTH */
085e3cec	25	#include <openssl/prov_ssl.h>
89abd1b6	26	#include "internal/constant_time.h"
c24937d5	27	#include "internal/sizes.h"
d9a75107	28	#include "crypto/rsa.h"
89abd1b6 MC	29	#include "prov/provider_ctx.h"
89abd1b6 MC	30	#include "prov/implementations.h"
87fe138d	31	#include "prov/providercommon.h"
7a810fac	32	#include "prov/securitycheck.h"
89abd1b6 MC	33
	34	#include <stdlib.h>
	35
363b1e5d	36	static OSSL_FUNC_asym_cipher_newctx_fn rsa_newctx;
8d17cca5	37	static OSSL_FUNC_asym_cipher_encrypt_init_fn rsa_encrypt_init;
363b1e5d	38	static OSSL_FUNC_asym_cipher_encrypt_fn rsa_encrypt;
8d17cca5	39	static OSSL_FUNC_asym_cipher_decrypt_init_fn rsa_decrypt_init;
363b1e5d DMSP	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;
89abd1b6	47
31a796d1	48	static OSSL_ITEM padding_item[] = {
b8086652	49	{ RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
b8086652 SL	50	{ RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
b8086652 SL	51	{ RSA_PKCS1_OAEP_PADDING, OSSL_PKEY_RSA_PAD_MODE_OAEP }, /* Correct spelling first */
31a796d1	52	{ RSA_PKCS1_OAEP_PADDING, "oeap" },
b8086652	53	{ RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
31a796d1 RL	54	{ 0, NULL }
31a796d1 RL	55	};
89abd1b6 MC	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 {
b4250010	64	OSSL_LIB_CTX *libctx;
89abd1b6 MC	65	RSA *rsa;
89abd1b6 MC	66	int pad_mode;
8d17cca5	67	int operation;
89abd1b6 MC	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;
d9a75107 MC	75	/* TLS padding */
	76	unsigned int client_version;
	77	unsigned int alt_version;
5ab3ec1b HK	78	/* PKCS#1 v1.5 decryption mode */
5ab3ec1b HK	79	unsigned int implicit_rejection;
89abd1b6 MC	80	} PROV_RSA_CTX;
	81
	82	static void rsa_newctx(void provctx)
	83	{
87fe138d	84	PROV_RSA_CTX *prsactx;
89abd1b6	85
87fe138d P	86	if (!ossl_prov_is_running())
	87	return NULL;
	88	prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
89abd1b6 MC	89	if (prsactx == NULL)
89abd1b6 MC	90	return NULL;
a829b735	91	prsactx->libctx = PROV_LIBCTX_OF(provctx);
89abd1b6 MC	92
	93	return prsactx;
	94	}
	95
cbdeb04c P	96	static int rsa_init(void vprsactx, void vrsa, const OSSL_PARAM params[],
cbdeb04c P	97	int operation)
89abd1b6 MC	98	{
	99	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	100
0cfbc828 TM	101	if (!ossl_prov_is_running() \|\| prsactx == NULL \|\| vrsa == NULL)
	102	return 0;
	103
6ce58488	104	if (!ossl_rsa_check_key(prsactx->libctx, vrsa, operation))
0cfbc828 TM	105	return 0;
	106
	107	if (!RSA_up_ref(vrsa))
89abd1b6 MC	108	return 0;
	109	RSA_free(prsactx->rsa);
	110	prsactx->rsa = vrsa;
8d17cca5	111	prsactx->operation = operation;
5ab3ec1b	112	prsactx->implicit_rejection = 1;
106ec30b RL	113
	114	switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
	115	case RSA_FLAG_TYPE_RSA:
	116	prsactx->pad_mode = RSA_PKCS1_PADDING;
	117	break;
	118	default:
0cfbc828 TM	119	/* This should not happen due to the check above */
0cfbc828 TM	120	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
8d17cca5 SL	121	return 0;
8d17cca5 SL	122	}
cbdeb04c	123	return rsa_set_ctx_params(prsactx, params);
89abd1b6 MC	124	}
89abd1b6 MC	125
cbdeb04c P	126	static int rsa_encrypt_init(void vprsactx, void vrsa,
cbdeb04c P	127	const OSSL_PARAM params[])
8d17cca5	128	{
cbdeb04c	129	return rsa_init(vprsactx, vrsa, params, EVP_PKEY_OP_ENCRYPT);
8d17cca5 SL	130	}
8d17cca5 SL	131
cbdeb04c P	132	static int rsa_decrypt_init(void vprsactx, void vrsa,
cbdeb04c P	133	const OSSL_PARAM params[])
8d17cca5	134	{
cbdeb04c	135	return rsa_init(vprsactx, vrsa, params, EVP_PKEY_OP_DECRYPT);
8d17cca5 SL	136	}
8d17cca5 SL	137
89abd1b6 MC	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	{
	141	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	142	int ret;
	143
87fe138d P	144	if (!ossl_prov_is_running())
	145	return 0;
	146
89abd1b6 MC	147	if (out == NULL) {
	148	size_t len = RSA_size(prsactx->rsa);
	149
	150	if (len == 0) {
	151	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
	152	return 0;
	153	}
	154	*outlen = len;
	155	return 1;
	156	}
	157
	158	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
	159	int rsasize = RSA_size(prsactx->rsa);
	160	unsigned char *tbuf;
	161
e077455e	162	if ((tbuf = OPENSSL_malloc(rsasize)) == NULL)
89abd1b6	163	return 0;
afb638f1 MC	164	if (prsactx->oaep_md == NULL) {
afb638f1 MC	165	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
c5aa7195 DB	166	if (prsactx->oaep_md == NULL) {
	167	OPENSSL_free(tbuf);
	168	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
	169	return 0;
	170	}
afb638f1	171	}
f7f53d7d	172	ret =
23b2fc0b P	173	ossl_rsa_padding_add_PKCS1_OAEP_mgf1_ex(prsactx->libctx, tbuf,
	174	rsasize, in, inlen,
	175	prsactx->oaep_label,
	176	prsactx->oaep_labellen,
	177	prsactx->oaep_md,
	178	prsactx->mgf1_md);
89abd1b6 MC	179
	180	if (!ret) {
	181	OPENSSL_free(tbuf);
	182	return 0;
	183	}
	184	ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
	185	RSA_NO_PADDING);
	186	OPENSSL_free(tbuf);
	187	} else {
	188	ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
	189	prsactx->pad_mode);
	190	}
	191	/* A ret value of 0 is not an error */
	192	if (ret < 0)
	193	return ret;
	194	*outlen = ret;
	195	return 1;
	196	}
	197
	198	static int rsa_decrypt(void vprsactx, unsigned char out, size_t *outlen,
	199	size_t outsize, const unsigned char *in, size_t inlen)
	200	{
	201	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	202	int ret;
5ab3ec1b	203	int pad_mode;
d9a75107	204	size_t len = RSA_size(prsactx->rsa);
89abd1b6	205
87fe138d P	206	if (!ossl_prov_is_running())
	207	return 0;
	208
d9a75107 MC	209	if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
	210	if (out == NULL) {
	211	*outlen = SSL_MAX_MASTER_KEY_LENGTH;
	212	return 1;
	213	}
	214	if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
	215	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
	216	return 0;
	217	}
	218	} else {
	219	if (out == NULL) {
	220	if (len == 0) {
	221	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
	222	return 0;
	223	}
	224	*outlen = len;
	225	return 1;
	226	}
89abd1b6	227
d9a75107 MC	228	if (outsize < len) {
d9a75107 MC	229	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
89abd1b6 MC	230	return 0;
89abd1b6 MC	231	}
89abd1b6 MC	232	}
89abd1b6 MC	233
d9a75107 MC	234	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
d9a75107 MC	235	\|\| prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
89abd1b6 MC	236	unsigned char *tbuf;
89abd1b6 MC	237
e077455e	238	if ((tbuf = OPENSSL_malloc(len)) == NULL)
89abd1b6	239	return 0;
89abd1b6 MC	240	ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
89abd1b6 MC	241	RSA_NO_PADDING);
d9a75107 MC	242	/*
	243	* With no padding then, on success ret should be len, otherwise an
	244	* error occurred (non-constant time)
	245	*/
	246	if (ret != (int)len) {
89abd1b6	247	OPENSSL_free(tbuf);
d9a75107	248	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
89abd1b6 MC	249	return 0;
89abd1b6 MC	250	}
d9a75107	251	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
afb638f1 MC	252	if (prsactx->oaep_md == NULL) {
	253	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
	254	if (prsactx->oaep_md == NULL) {
bca681aa	255	OPENSSL_free(tbuf);
6debc6ab	256	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
afb638f1 MC	257	return 0;
	258	}
	259	}
d9a75107 MC	260	ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
	261	len, len,
	262	prsactx->oaep_label,
	263	prsactx->oaep_labellen,
	264	prsactx->oaep_md,
	265	prsactx->mgf1_md);
	266	} else {
	267	/* RSA_PKCS1_WITH_TLS_PADDING */
	268	if (prsactx->client_version <= 0) {
	269	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
bca681aa	270	OPENSSL_free(tbuf);
d9a75107 MC	271	return 0;
d9a75107 MC	272	}
23b2fc0b P	273	ret = ossl_rsa_padding_check_PKCS1_type_2_TLS(
	274	prsactx->libctx, out, outsize, tbuf, len,
	275	prsactx->client_version, prsactx->alt_version);
d9a75107	276	}
89abd1b6 MC	277	OPENSSL_free(tbuf);
89abd1b6 MC	278	} else {
5ab3ec1b HK	279	if ((prsactx->implicit_rejection == 0) &&
	280	(prsactx->pad_mode == RSA_PKCS1_PADDING))
	281	pad_mode = RSA_PKCS1_NO_IMPLICIT_REJECT_PADDING;
	282	else
	283	pad_mode = prsactx->pad_mode;
	284	ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa, pad_mode);
89abd1b6 MC	285	}
	286	outlen = constant_time_select_s(constant_time_msb_s(ret), outlen, ret);
	287	ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
	288	return ret;
	289	}
	290
	291	static void rsa_freectx(void *vprsactx)
	292	{
	293	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	294
	295	RSA_free(prsactx->rsa);
	296
	297	EVP_MD_free(prsactx->oaep_md);
	298	EVP_MD_free(prsactx->mgf1_md);
5606922c	299	OPENSSL_free(prsactx->oaep_label);
89abd1b6 MC	300
	301	OPENSSL_free(prsactx);
	302	}
	303
	304	static void rsa_dupctx(void vprsactx)
	305	{
	306	PROV_RSA_CTX srcctx = (PROV_RSA_CTX )vprsactx;
	307	PROV_RSA_CTX *dstctx;
	308
87fe138d P	309	if (!ossl_prov_is_running())
	310	return NULL;
	311
89abd1b6 MC	312	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
	313	if (dstctx == NULL)
	314	return NULL;
	315
	316	dstctx = srcctx;
	317	if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
	318	OPENSSL_free(dstctx);
	319	return NULL;
	320	}
	321
	322	if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
	323	RSA_free(dstctx->rsa);
	324	OPENSSL_free(dstctx);
	325	return NULL;
	326	}
	327
	328	if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
	329	RSA_free(dstctx->rsa);
	330	EVP_MD_free(dstctx->oaep_md);
	331	OPENSSL_free(dstctx);
	332	return NULL;
	333	}
	334
	335	return dstctx;
	336	}
	337
	338	static int rsa_get_ctx_params(void vprsactx, OSSL_PARAM params)
	339	{
	340	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	341	OSSL_PARAM *p;
	342
cbdeb04c	343	if (prsactx == NULL)
89abd1b6 MC	344	return 0;
	345
	346	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
31a796d1 RL	347	if (p != NULL)
	348	switch (p->data_type) {
	349	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
	350	if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
	351	return 0;
	352	break;
	353	case OSSL_PARAM_UTF8_STRING:
	354	{
	355	int i;
	356	const char *word = NULL;
	357
	358	for (i = 0; padding_item[i].id != 0; i++) {
	359	if (prsactx->pad_mode == (int)padding_item[i].id) {
	360	word = padding_item[i].ptr;
	361	break;
	362	}
	363	}
	364
	365	if (word != NULL) {
	366	if (!OSSL_PARAM_set_utf8_string(p, word))
	367	return 0;
	368	} else {
	369	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
	370	}
	371	}
	372	break;
	373	default:
	374	return 0;
	375	}
89abd1b6 MC	376
	377	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
	378	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
	379	? ""
ed576acd	380	: EVP_MD_get0_name(prsactx->oaep_md)))
89abd1b6 MC	381	return 0;
	382
	383	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
	384	if (p != NULL) {
	385	EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
	386	: prsactx->mgf1_md;
	387
	388	if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
	389	? ""
ed576acd	390	: EVP_MD_get0_name(mgf1_md)))
89abd1b6 MC	391	return 0;
	392	}
	393
	394	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
ba0a6d1d RL	395	if (p != NULL &&
	396	!OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label,
	397	prsactx->oaep_labellen))
89abd1b6 MC	398	return 0;
89abd1b6 MC	399
d9a75107 MC	400	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
	401	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
	402	return 0;
	403
	404	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
	405	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
	406	return 0;
	407
5ab3ec1b HK	408	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
	409	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->implicit_rejection))
	410	return 0;
	411
89abd1b6 MC	412	return 1;
	413	}
	414
	415	static const OSSL_PARAM known_gettable_ctx_params[] = {
	416	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
31a796d1	417	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
89abd1b6 MC	418	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
	419	OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
	420	NULL, 0),
d9a75107 MC	421	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
d9a75107 MC	422	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
5ab3ec1b	423	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
89abd1b6 MC	424	OSSL_PARAM_END
	425	};
	426
fb67126e TM	427	static const OSSL_PARAM rsa_gettable_ctx_params(ossl_unused void vprsactx,
fb67126e TM	428	ossl_unused void *provctx)
89abd1b6 MC	429	{
	430	return known_gettable_ctx_params;
	431	}
	432
	433	static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
	434	{
	435	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	436	const OSSL_PARAM *p;
c24937d5 RL	437	char mdname[OSSL_MAX_NAME_SIZE];
c24937d5 RL	438	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
e5a7536e	439	char *str = NULL;
89abd1b6	440
cbdeb04c	441	if (prsactx == NULL)
89abd1b6	442	return 0;
cbdeb04c P	443	if (params == NULL)
cbdeb04c P	444	return 1;
89abd1b6 MC	445
	446	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
	447	if (p != NULL) {
e5a7536e	448	str = mdname;
89abd1b6 MC	449	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
	450	return 0;
	451
89abd1b6 MC	452	p = OSSL_PARAM_locate_const(params,
	453	OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
	454	if (p != NULL) {
e5a7536e	455	str = mdprops;
89abd1b6 MC	456	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
	457	return 0;
	458	}
	459
	460	EVP_MD_free(prsactx->oaep_md);
	461	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
	462
	463	if (prsactx->oaep_md == NULL)
	464	return 0;
	465	}
	466
	467	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
	468	if (p != NULL) {
31a796d1 RL	469	int pad_mode = 0;
	470
	471	switch (p->data_type) {
	472	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
	473	if (!OSSL_PARAM_get_int(p, &pad_mode))
	474	return 0;
	475	break;
	476	case OSSL_PARAM_UTF8_STRING:
	477	{
	478	int i;
	479
	480	if (p->data == NULL)
	481	return 0;
	482
	483	for (i = 0; padding_item[i].id != 0; i++) {
	484	if (strcmp(p->data, padding_item[i].ptr) == 0) {
	485	pad_mode = padding_item[i].id;
	486	break;
	487	}
	488	}
	489	}
	490	break;
	491	default:
89abd1b6	492	return 0;
31a796d1 RL	493	}
31a796d1 RL	494
89abd1b6 MC	495	/*
	496	* PSS padding is for signatures only so is not compatible with
	497	* asymmetric cipher use.
	498	*/
	499	if (pad_mode == RSA_PKCS1_PSS_PADDING)
	500	return 0;
	501	if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
	502	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
	503	if (prsactx->oaep_md == NULL)
	504	return 0;
	505	}
	506	prsactx->pad_mode = pad_mode;
	507	}
	508
	509	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
	510	if (p != NULL) {
e5a7536e	511	str = mdname;
89abd1b6 MC	512	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
	513	return 0;
	514
89abd1b6 MC	515	p = OSSL_PARAM_locate_const(params,
	516	OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
	517	if (p != NULL) {
e5a7536e	518	str = mdprops;
89abd1b6 MC	519	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
	520	return 0;
	521	} else {
	522	str = NULL;
	523	}
	524
	525	EVP_MD_free(prsactx->mgf1_md);
	526	prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
	527
	528	if (prsactx->mgf1_md == NULL)
	529	return 0;
	530	}
	531
	532	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
	533	if (p != NULL) {
	534	void *tmp_label = NULL;
	535	size_t tmp_labellen;
	536
	537	if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
	538	return 0;
	539	OPENSSL_free(prsactx->oaep_label);
	540	prsactx->oaep_label = (unsigned char *)tmp_label;
	541	prsactx->oaep_labellen = tmp_labellen;
	542	}
	543
d9a75107 MC	544	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
	545	if (p != NULL) {
	546	unsigned int client_version;
	547
	548	if (!OSSL_PARAM_get_uint(p, &client_version))
	549	return 0;
	550	prsactx->client_version = client_version;
	551	}
	552
	553	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
	554	if (p != NULL) {
	555	unsigned int alt_version;
	556
	557	if (!OSSL_PARAM_get_uint(p, &alt_version))
	558	return 0;
	559	prsactx->alt_version = alt_version;
	560	}
5ab3ec1b HK	561	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
	562	if (p != NULL) {
	563	unsigned int implicit_rejection;
	564
	565	if (!OSSL_PARAM_get_uint(p, &implicit_rejection))
	566	return 0;
	567	prsactx->implicit_rejection = implicit_rejection;
	568	}
d9a75107	569
89abd1b6 MC	570	return 1;
	571	}
	572
	573	static const OSSL_PARAM known_settable_ctx_params[] = {
	574	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
31a796d1	575	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
89abd1b6 MC	576	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
	577	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
	578	OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
d9a75107 MC	579	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
d9a75107 MC	580	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
5ab3ec1b	581	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
89abd1b6 MC	582	OSSL_PARAM_END
	583	};
	584
fb67126e TM	585	static const OSSL_PARAM rsa_settable_ctx_params(ossl_unused void vprsactx,
fb67126e TM	586	ossl_unused void *provctx)
89abd1b6 MC	587	{
	588	return known_settable_ctx_params;
	589	}
	590
1be63951	591	const OSSL_DISPATCH ossl_rsa_asym_cipher_functions[] = {
89abd1b6	592	{ OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
8d17cca5	593	{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_encrypt_init },
89abd1b6	594	{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
8d17cca5	595	{ OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_decrypt_init },
89abd1b6 MC	596	{ OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
	597	{ OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
	598	{ OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
	599	{ OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
	600	(void (*)(void))rsa_get_ctx_params },
	601	{ OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
	602	(void (*)(void))rsa_gettable_ctx_params },
	603	{ OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
	604	(void (*)(void))rsa_set_ctx_params },
	605	{ OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
	606	(void (*)(void))rsa_settable_ctx_params },
1e6bd31e	607	OSSL_DISPATCH_END
89abd1b6	608	};