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

/*
 * 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 },
    OSSL_DISPATCH_END
};
Commit	Line	Data
89abd1b6	1	/*
4333b89f	2	* Copyright 2019-2021 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	164	if (prsactx->oaep_md == NULL) {
5472821e	165	OPENSSL_free(tbuf);
afb638f1	166	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
6debc6ab	167	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
afb638f1 MC	168	return 0;
afb638f1 MC	169	}
f7f53d7d	170	ret =
23b2fc0b P	171	ossl_rsa_padding_add_PKCS1_OAEP_mgf1_ex(prsactx->libctx, tbuf,
	172	rsasize, in, inlen,
	173	prsactx->oaep_label,
	174	prsactx->oaep_labellen,
	175	prsactx->oaep_md,
	176	prsactx->mgf1_md);
89abd1b6 MC	177
	178	if (!ret) {
	179	OPENSSL_free(tbuf);
	180	return 0;
	181	}
	182	ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
	183	RSA_NO_PADDING);
	184	OPENSSL_free(tbuf);
	185	} else {
	186	ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
	187	prsactx->pad_mode);
	188	}
	189	/* A ret value of 0 is not an error */
	190	if (ret < 0)
	191	return ret;
	192	*outlen = ret;
	193	return 1;
	194	}
	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	{
	199	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	200	int ret;
5ab3ec1b	201	int pad_mode;
d9a75107	202	size_t len = RSA_size(prsactx->rsa);
89abd1b6	203
87fe138d P	204	if (!ossl_prov_is_running())
	205	return 0;
	206
d9a75107 MC	207	if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
	208	if (out == NULL) {
	209	*outlen = SSL_MAX_MASTER_KEY_LENGTH;
	210	return 1;
	211	}
	212	if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
	213	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
	214	return 0;
	215	}
	216	} else {
	217	if (out == NULL) {
	218	if (len == 0) {
	219	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
	220	return 0;
	221	}
	222	*outlen = len;
	223	return 1;
	224	}
89abd1b6	225
d9a75107 MC	226	if (outsize < len) {
d9a75107 MC	227	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
89abd1b6 MC	228	return 0;
89abd1b6 MC	229	}
89abd1b6 MC	230	}
89abd1b6 MC	231
d9a75107 MC	232	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
d9a75107 MC	233	\|\| prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
89abd1b6 MC	234	unsigned char *tbuf;
89abd1b6 MC	235
e077455e	236	if ((tbuf = OPENSSL_malloc(len)) == NULL)
89abd1b6	237	return 0;
89abd1b6 MC	238	ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
89abd1b6 MC	239	RSA_NO_PADDING);
d9a75107 MC	240	/*
	241	* With no padding then, on success ret should be len, otherwise an
	242	* error occurred (non-constant time)
	243	*/
	244	if (ret != (int)len) {
89abd1b6	245	OPENSSL_free(tbuf);
d9a75107	246	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
89abd1b6 MC	247	return 0;
89abd1b6 MC	248	}
d9a75107	249	if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
afb638f1 MC	250	if (prsactx->oaep_md == NULL) {
	251	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
	252	if (prsactx->oaep_md == NULL) {
bca681aa	253	OPENSSL_free(tbuf);
6debc6ab	254	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
afb638f1 MC	255	return 0;
	256	}
	257	}
d9a75107 MC	258	ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
	259	len, len,
	260	prsactx->oaep_label,
	261	prsactx->oaep_labellen,
	262	prsactx->oaep_md,
	263	prsactx->mgf1_md);
	264	} else {
	265	/* RSA_PKCS1_WITH_TLS_PADDING */
	266	if (prsactx->client_version <= 0) {
	267	ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
bca681aa	268	OPENSSL_free(tbuf);
d9a75107 MC	269	return 0;
d9a75107 MC	270	}
23b2fc0b P	271	ret = ossl_rsa_padding_check_PKCS1_type_2_TLS(
	272	prsactx->libctx, out, outsize, tbuf, len,
	273	prsactx->client_version, prsactx->alt_version);
d9a75107	274	}
89abd1b6 MC	275	OPENSSL_free(tbuf);
89abd1b6 MC	276	} else {
5ab3ec1b HK	277	if ((prsactx->implicit_rejection == 0) &&
	278	(prsactx->pad_mode == RSA_PKCS1_PADDING))
	279	pad_mode = RSA_PKCS1_NO_IMPLICIT_REJECT_PADDING;
	280	else
	281	pad_mode = prsactx->pad_mode;
	282	ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa, pad_mode);
89abd1b6 MC	283	}
	284	outlen = constant_time_select_s(constant_time_msb_s(ret), outlen, ret);
	285	ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
	286	return ret;
	287	}
	288
	289	static void rsa_freectx(void *vprsactx)
	290	{
	291	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	292
	293	RSA_free(prsactx->rsa);
	294
	295	EVP_MD_free(prsactx->oaep_md);
	296	EVP_MD_free(prsactx->mgf1_md);
5606922c	297	OPENSSL_free(prsactx->oaep_label);
89abd1b6 MC	298
	299	OPENSSL_free(prsactx);
	300	}
	301
	302	static void rsa_dupctx(void vprsactx)
	303	{
	304	PROV_RSA_CTX srcctx = (PROV_RSA_CTX )vprsactx;
	305	PROV_RSA_CTX *dstctx;
	306
87fe138d P	307	if (!ossl_prov_is_running())
	308	return NULL;
	309
89abd1b6 MC	310	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
	311	if (dstctx == NULL)
	312	return NULL;
	313
	314	dstctx = srcctx;
	315	if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
	316	OPENSSL_free(dstctx);
	317	return NULL;
	318	}
	319
	320	if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
	321	RSA_free(dstctx->rsa);
	322	OPENSSL_free(dstctx);
	323	return NULL;
	324	}
	325
	326	if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
	327	RSA_free(dstctx->rsa);
	328	EVP_MD_free(dstctx->oaep_md);
	329	OPENSSL_free(dstctx);
	330	return NULL;
	331	}
	332
	333	return dstctx;
	334	}
	335
	336	static int rsa_get_ctx_params(void vprsactx, OSSL_PARAM params)
	337	{
	338	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	339	OSSL_PARAM *p;
	340
cbdeb04c	341	if (prsactx == NULL)
89abd1b6 MC	342	return 0;
	343
	344	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
31a796d1 RL	345	if (p != NULL)
	346	switch (p->data_type) {
	347	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
	348	if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
	349	return 0;
	350	break;
	351	case OSSL_PARAM_UTF8_STRING:
	352	{
	353	int i;
	354	const char *word = NULL;
	355
	356	for (i = 0; padding_item[i].id != 0; i++) {
	357	if (prsactx->pad_mode == (int)padding_item[i].id) {
	358	word = padding_item[i].ptr;
	359	break;
	360	}
	361	}
	362
	363	if (word != NULL) {
	364	if (!OSSL_PARAM_set_utf8_string(p, word))
	365	return 0;
	366	} else {
	367	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
	368	}
	369	}
	370	break;
	371	default:
	372	return 0;
	373	}
89abd1b6 MC	374
	375	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
	376	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
	377	? ""
ed576acd	378	: EVP_MD_get0_name(prsactx->oaep_md)))
89abd1b6 MC	379	return 0;
	380
	381	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
	382	if (p != NULL) {
	383	EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
	384	: prsactx->mgf1_md;
	385
	386	if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
	387	? ""
ed576acd	388	: EVP_MD_get0_name(mgf1_md)))
89abd1b6 MC	389	return 0;
	390	}
	391
	392	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
ba0a6d1d RL	393	if (p != NULL &&
	394	!OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label,
	395	prsactx->oaep_labellen))
89abd1b6 MC	396	return 0;
89abd1b6 MC	397
d9a75107 MC	398	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
	399	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
	400	return 0;
	401
	402	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
	403	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
	404	return 0;
	405
5ab3ec1b HK	406	p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
	407	if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->implicit_rejection))
	408	return 0;
	409
89abd1b6 MC	410	return 1;
	411	}
	412
	413	static const OSSL_PARAM known_gettable_ctx_params[] = {
	414	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
31a796d1	415	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
89abd1b6 MC	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),
d9a75107 MC	419	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
d9a75107 MC	420	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
5ab3ec1b	421	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
89abd1b6 MC	422	OSSL_PARAM_END
	423	};
	424
fb67126e TM	425	static const OSSL_PARAM rsa_gettable_ctx_params(ossl_unused void vprsactx,
fb67126e TM	426	ossl_unused void *provctx)
89abd1b6 MC	427	{
	428	return known_gettable_ctx_params;
	429	}
	430
	431	static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
	432	{
	433	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
	434	const OSSL_PARAM *p;
c24937d5 RL	435	char mdname[OSSL_MAX_NAME_SIZE];
c24937d5 RL	436	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
e5a7536e	437	char *str = NULL;
89abd1b6	438
cbdeb04c	439	if (prsactx == NULL)
89abd1b6	440	return 0;
cbdeb04c P	441	if (params == NULL)
cbdeb04c P	442	return 1;
89abd1b6 MC	443
	444	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
	445	if (p != NULL) {
e5a7536e	446	str = mdname;
89abd1b6 MC	447	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
	448	return 0;
	449
89abd1b6 MC	450	p = OSSL_PARAM_locate_const(params,
	451	OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
	452	if (p != NULL) {
e5a7536e	453	str = mdprops;
89abd1b6 MC	454	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
	455	return 0;
	456	}
	457
	458	EVP_MD_free(prsactx->oaep_md);
	459	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
	460
	461	if (prsactx->oaep_md == NULL)
	462	return 0;
	463	}
	464
	465	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
	466	if (p != NULL) {
31a796d1 RL	467	int pad_mode = 0;
	468
	469	switch (p->data_type) {
	470	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
	471	if (!OSSL_PARAM_get_int(p, &pad_mode))
	472	return 0;
	473	break;
	474	case OSSL_PARAM_UTF8_STRING:
	475	{
	476	int i;
	477
	478	if (p->data == NULL)
	479	return 0;
	480
	481	for (i = 0; padding_item[i].id != 0; i++) {
	482	if (strcmp(p->data, padding_item[i].ptr) == 0) {
	483	pad_mode = padding_item[i].id;
	484	break;
	485	}
	486	}
	487	}
	488	break;
	489	default:
89abd1b6	490	return 0;
31a796d1 RL	491	}
31a796d1 RL	492
89abd1b6 MC	493	/*
	494	* PSS padding is for signatures only so is not compatible with
	495	* asymmetric cipher use.
	496	*/
	497	if (pad_mode == RSA_PKCS1_PSS_PADDING)
	498	return 0;
	499	if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
	500	prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
	501	if (prsactx->oaep_md == NULL)
	502	return 0;
	503	}
	504	prsactx->pad_mode = pad_mode;
	505	}
	506
	507	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
	508	if (p != NULL) {
e5a7536e	509	str = mdname;
89abd1b6 MC	510	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
	511	return 0;
	512
89abd1b6 MC	513	p = OSSL_PARAM_locate_const(params,
	514	OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
	515	if (p != NULL) {
e5a7536e	516	str = mdprops;
89abd1b6 MC	517	if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
	518	return 0;
	519	} else {
	520	str = NULL;
	521	}
	522
	523	EVP_MD_free(prsactx->mgf1_md);
	524	prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
	525
	526	if (prsactx->mgf1_md == NULL)
	527	return 0;
	528	}
	529
	530	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
	531	if (p != NULL) {
	532	void *tmp_label = NULL;
	533	size_t tmp_labellen;
	534
	535	if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
	536	return 0;
	537	OPENSSL_free(prsactx->oaep_label);
	538	prsactx->oaep_label = (unsigned char *)tmp_label;
	539	prsactx->oaep_labellen = tmp_labellen;
	540	}
	541
d9a75107 MC	542	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
	543	if (p != NULL) {
	544	unsigned int client_version;
	545
	546	if (!OSSL_PARAM_get_uint(p, &client_version))
	547	return 0;
	548	prsactx->client_version = client_version;
	549	}
	550
	551	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
	552	if (p != NULL) {
	553	unsigned int alt_version;
	554
	555	if (!OSSL_PARAM_get_uint(p, &alt_version))
	556	return 0;
	557	prsactx->alt_version = alt_version;
	558	}
5ab3ec1b HK	559	p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION);
	560	if (p != NULL) {
	561	unsigned int implicit_rejection;
	562
	563	if (!OSSL_PARAM_get_uint(p, &implicit_rejection))
	564	return 0;
	565	prsactx->implicit_rejection = implicit_rejection;
	566	}
d9a75107	567
89abd1b6 MC	568	return 1;
	569	}
	570
	571	static const OSSL_PARAM known_settable_ctx_params[] = {
	572	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
31a796d1	573	OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
89abd1b6 MC	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),
d9a75107 MC	577	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
d9a75107 MC	578	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
5ab3ec1b	579	OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_IMPLICIT_REJECTION, NULL),
89abd1b6 MC	580	OSSL_PARAM_END
	581	};
	582
fb67126e TM	583	static const OSSL_PARAM rsa_settable_ctx_params(ossl_unused void vprsactx,
fb67126e TM	584	ossl_unused void *provctx)
89abd1b6 MC	585	{
	586	return known_settable_ctx_params;
	587	}
	588
1be63951	589	const OSSL_DISPATCH ossl_rsa_asym_cipher_functions[] = {
89abd1b6	590	{ OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
8d17cca5	591	{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_encrypt_init },
89abd1b6	592	{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
8d17cca5	593	{ OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_decrypt_init },
89abd1b6 MC	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 },
1e6bd31e	605	OSSL_DISPATCH_END
89abd1b6	606	};