/*

 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include "internal/refcount.h"

#include <openssl/bn.h>

#include <openssl/err.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/rsa.h>

#include <openssl/dsa.h>

#include <openssl/dh.h>

#include <openssl/cmac.h>

#include <openssl/engine.h>

#include "internal/asn1_int.h"

#include "internal/evp_int.h"

static void EVP_PKEY_free_it(EVP_PKEY *x);

int EVP_PKEY_bits(const EVP_PKEY *pkey)

{

    if (pkey && pkey->ameth && pkey->ameth->pkey_bits)

        return pkey->ameth->pkey_bits(pkey);

    return 0;

}

int EVP_PKEY_security_bits(const EVP_PKEY *pkey)

{

    if (pkey == NULL)

        return 0;

    if (!pkey->ameth || !pkey->ameth->pkey_security_bits)

        return -2;

    return pkey->ameth->pkey_security_bits(pkey);

}

int EVP_PKEY_size(EVP_PKEY *pkey)

{

    if (pkey && pkey->ameth && pkey->ameth->pkey_size)

        return pkey->ameth->pkey_size(pkey);

    return 0;

}

int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)

{

#ifndef OPENSSL_NO_DSA

    if (pkey->type == EVP_PKEY_DSA) {

        int ret = pkey->save_parameters;

        if (mode >= 0)

            pkey->save_parameters = mode;

        return ret;

    }

#endif

#ifndef OPENSSL_NO_EC

    if (pkey->type == EVP_PKEY_EC) {

        int ret = pkey->save_parameters;

        if (mode >= 0)

            pkey->save_parameters = mode;

        return ret;

    }

#endif

    return 0;

}

int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)

{

    if (to->type == EVP_PKEY_NONE) {

        if (EVP_PKEY_set_type(to, from->type) == 0)

            return 0;

    } else if (to->type != from->type) {

        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);

        goto err;

    }

    if (EVP_PKEY_missing_parameters(from)) {

        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);

        goto err;

    }

    if (!EVP_PKEY_missing_parameters(to)) {

        if (EVP_PKEY_cmp_parameters(to, from) == 1)

            return 1;

        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_PARAMETERS);

        return 0;

    }

    if (from->ameth && from->ameth->param_copy)

        return from->ameth->param_copy(to, from);

 err:

    return 0;

}

int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)

{

    if (pkey->ameth && pkey->ameth->param_missing)

        return pkey->ameth->param_missing(pkey);

    return 0;

}

int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)

{

    if (a->type != b->type)

        return -1;

    if (a->ameth && a->ameth->param_cmp)

        return a->ameth->param_cmp(a, b);

    return -2;

}

int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)

{

    if (a->type != b->type)

        return -1;

    if (a->ameth) {

        int ret;

        /* Compare parameters if the algorithm has them */

        if (a->ameth->param_cmp) {

            ret = a->ameth->param_cmp(a, b);

            if (ret <= 0)

                return ret;

        }

        if (a->ameth->pub_cmp)

            return a->ameth->pub_cmp(a, b);

    }

    return -2;

}

EVP_PKEY *EVP_PKEY_new(void)

{

    EVP_PKEY *ret = OPENSSL_zalloc(sizeof(*ret));

    if (ret == NULL) {

        EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    ret->type = EVP_PKEY_NONE;

    ret->save_type = EVP_PKEY_NONE;

    ret->references = 1;

    ret->save_parameters = 1;

    ret->lock = CRYPTO_THREAD_lock_new();

    if (ret->lock == NULL) {

        EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);

        OPENSSL_free(ret);

        return NULL;

    }

    return ret;

}

int EVP_PKEY_up_ref(EVP_PKEY *pkey)

{

    int i;

    if (CRYPTO_UP_REF(&pkey->references, &i, pkey->lock) <= 0)

        return 0;

    REF_PRINT_COUNT("EVP_PKEY", pkey);

    REF_ASSERT_ISNT(i < 2);

    return ((i > 1) ? 1 : 0);

}

/*

 * Setup a public key ASN1 method and ENGINE from a NID or a string. If pkey

 * is NULL just return 1 or 0 if the algorithm exists.

 */

static int pkey_set_type(EVP_PKEY *pkey, ENGINE *e, int type, const char *str,

                         int len)

{

    const EVP_PKEY_ASN1_METHOD *ameth;

    ENGINE **eptr = (e == NULL) ? &e :  NULL;

    if (pkey) {

        if (pkey->pkey.ptr)

            EVP_PKEY_free_it(pkey);

        /*

         * If key type matches and a method exists then this lookup has

         * succeeded once so just indicate success.

         */

        if ((type == pkey->save_type) && pkey->ameth)

            return 1;

#ifndef OPENSSL_NO_ENGINE

        /* If we have ENGINEs release them */

        ENGINE_finish(pkey->engine);

        pkey->engine = NULL;

        ENGINE_finish(pkey->pmeth_engine);

        pkey->pmeth_engine = NULL;

#endif

    }

    if (str)

        ameth = EVP_PKEY_asn1_find_str(eptr, str, len);

    else

        ameth = EVP_PKEY_asn1_find(eptr, type);

#ifndef OPENSSL_NO_ENGINE

    if (pkey == NULL && eptr != NULL)

        ENGINE_finish(e);

#endif

    if (ameth == NULL) {

        EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);

        return 0;

    }

    if (pkey) {

        pkey->ameth = ameth;

        pkey->engine = e;

        pkey->type = pkey->ameth->pkey_id;

        pkey->save_type = type;

    }

    return 1;

}

EVP_PKEY *EVP_PKEY_new_raw_private_key(int type, ENGINE *e,

                                       const unsigned char *priv,

                                       size_t len)

{

    EVP_PKEY *ret = EVP_PKEY_new();

    if (ret == NULL

            || !pkey_set_type(ret, e, type, NULL, -1)) {

        /* EVPerr already called */

        goto err;

    }

    if (ret->ameth->set_priv_key == NULL) {

        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PRIVATE_KEY,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        goto err;

    }

    if (!ret->ameth->set_priv_key(ret, priv, len)) {

        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PRIVATE_KEY, EVP_R_KEY_SETUP_FAILED);

        goto err;

    }

    return ret;

 err:

    EVP_PKEY_free(ret);

    return NULL;

}

EVP_PKEY *EVP_PKEY_new_raw_public_key(int type, ENGINE *e,

                                      const unsigned char *pub,

                                      size_t len)

{

    EVP_PKEY *ret = EVP_PKEY_new();

    if (ret == NULL

            || !pkey_set_type(ret, e, type, NULL, -1)) {

        /* EVPerr already called */

        goto err;

    }

    if (ret->ameth->set_pub_key == NULL) {

        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PUBLIC_KEY,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        goto err;

    }

    if (!ret->ameth->set_pub_key(ret, pub, len)) {

        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PUBLIC_KEY, EVP_R_KEY_SETUP_FAILED);

        goto err;

    }

    return ret;

 err:

    EVP_PKEY_free(ret);

    return NULL;

}

int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey, unsigned char *priv,

                                 size_t *len)

{

     if (pkey->ameth->get_priv_key == NULL) {

        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PRIVATE_KEY,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return 0;

    }

    if (!pkey->ameth->get_priv_key(pkey, priv, len)) {

        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PRIVATE_KEY, EVP_R_GET_RAW_KEY_FAILED);

        return 0;

    }

    return 1;

}

int EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub,

                                size_t *len)

{

     if (pkey->ameth->get_pub_key == NULL) {

        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PUBLIC_KEY,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return 0;

    }

    if (!pkey->ameth->get_pub_key(pkey, pub, len)) {

        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PUBLIC_KEY, EVP_R_GET_RAW_KEY_FAILED);

        return 0;

    }

    return 1;

}

EVP_PKEY *EVP_PKEY_new_CMAC_key(ENGINE *e, const unsigned char *priv,

                                size_t len, const EVP_CIPHER *cipher)

{

#ifndef OPENSSL_NO_CMAC

    EVP_PKEY *ret = EVP_PKEY_new();

    CMAC_CTX *cmctx = CMAC_CTX_new();

    if (ret == NULL

            || cmctx == NULL

            || !pkey_set_type(ret, e, EVP_PKEY_CMAC, NULL, -1)) {

        /* EVPerr already called */

        goto err;

    }

    if (!CMAC_Init(cmctx, priv, len, cipher, e)) {

        EVPerr(EVP_F_EVP_PKEY_NEW_CMAC_KEY, EVP_R_KEY_SETUP_FAILED);

        goto err;

    }

    ret->pkey.ptr = cmctx;

    return ret;

 err:

    EVP_PKEY_free(ret);

    CMAC_CTX_free(cmctx);

    return NULL;

#else

    EVPerr(EVP_F_EVP_PKEY_NEW_CMAC_KEY,

           EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

    return NULL;

#endif

}

int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)

{

    return pkey_set_type(pkey, NULL, type, NULL, -1);

}

int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)

{

    return pkey_set_type(pkey, NULL, EVP_PKEY_NONE, str, len);

}

int EVP_PKEY_set_alias_type(EVP_PKEY *pkey, int type)

{

    if (pkey->type == type) {

        return 1; /* it already is that type */

    }

    /*

     * The application is requesting to alias this to a different pkey type,

     * but not one that resolves to the base type.

     */

    if (EVP_PKEY_type(type) != EVP_PKEY_base_id(pkey)) {

        EVPerr(EVP_F_EVP_PKEY_SET_ALIAS_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);

        return 0;

    }

    pkey->type = type;

    return 1;

}

#ifndef OPENSSL_NO_ENGINE

int EVP_PKEY_set1_engine(EVP_PKEY *pkey, ENGINE *e)

{

    if (e != NULL) {

        if (!ENGINE_init(e)) {

            EVPerr(EVP_F_EVP_PKEY_SET1_ENGINE, ERR_R_ENGINE_LIB);

            return 0;

        }

        if (ENGINE_get_pkey_meth(e, pkey->type) == NULL) {

            ENGINE_finish(e);

            EVPerr(EVP_F_EVP_PKEY_SET1_ENGINE, EVP_R_UNSUPPORTED_ALGORITHM);

            return 0;

        }

    }

    ENGINE_finish(pkey->pmeth_engine);

    pkey->pmeth_engine = e;

    return 1;

}

#endif

int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)

{

    if (pkey == NULL || !EVP_PKEY_set_type(pkey, type))

        return 0;

    pkey->pkey.ptr = key;

    return (key != NULL);

}

void *EVP_PKEY_get0(const EVP_PKEY *pkey)

{

    return pkey->pkey.ptr;

}

const unsigned char *EVP_PKEY_get0_hmac(const EVP_PKEY *pkey, size_t *len)

{

    ASN1_OCTET_STRING *os = NULL;

    if (pkey->type != EVP_PKEY_HMAC) {

        EVPerr(EVP_F_EVP_PKEY_GET0_HMAC, EVP_R_EXPECTING_AN_HMAC_KEY);

        return NULL;

    }

    os = EVP_PKEY_get0(pkey);

    *len = os->length;

    return os->data;

}

#ifndef OPENSSL_NO_POLY1305

const unsigned char *EVP_PKEY_get0_poly1305(const EVP_PKEY *pkey, size_t *len)

{

    ASN1_OCTET_STRING *os = NULL;

    if (pkey->type != EVP_PKEY_POLY1305) {

        EVPerr(EVP_F_EVP_PKEY_GET0_POLY1305, EVP_R_EXPECTING_A_POLY1305_KEY);

        return NULL;

    }

    os = EVP_PKEY_get0(pkey);

    *len = os->length;

    return os->data;

}

#endif

#ifndef OPENSSL_NO_SIPHASH

const unsigned char *EVP_PKEY_get0_siphash(const EVP_PKEY *pkey, size_t *len)

{

    ASN1_OCTET_STRING *os = NULL;

    if (pkey->type != EVP_PKEY_SIPHASH) {

        EVPerr(EVP_F_EVP_PKEY_GET0_SIPHASH, EVP_R_EXPECTING_A_SIPHASH_KEY);

        return NULL;

    }

    os = EVP_PKEY_get0(pkey);

    *len = os->length;

    return os->data;

}

#endif

#ifndef OPENSSL_NO_RSA

int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)

{

    int ret = EVP_PKEY_assign_RSA(pkey, key);

    if (ret)

        RSA_up_ref(key);

    return ret;

}

RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_RSA) {

        EVPerr(EVP_F_EVP_PKEY_GET0_RSA, EVP_R_EXPECTING_AN_RSA_KEY);

        return NULL;

    }

    return pkey->pkey.rsa;

}

RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)

{

    RSA *ret = EVP_PKEY_get0_RSA(pkey);

    if (ret != NULL)

        RSA_up_ref(ret);

    return ret;

}

#endif

#ifndef OPENSSL_NO_DSA

int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)

{

    int ret = EVP_PKEY_assign_DSA(pkey, key);

    if (ret)

        DSA_up_ref(key);

    return ret;

}

DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_DSA) {

        EVPerr(EVP_F_EVP_PKEY_GET0_DSA, EVP_R_EXPECTING_A_DSA_KEY);

        return NULL;

    }

    return pkey->pkey.dsa;

}

DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)

{

    DSA *ret = EVP_PKEY_get0_DSA(pkey);

    if (ret != NULL)

        DSA_up_ref(ret);

    return ret;

}

#endif

#ifndef OPENSSL_NO_EC

int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)

{

    int ret = EVP_PKEY_assign_EC_KEY(pkey, key);

    if (ret)

        EC_KEY_up_ref(key);

    return ret;

}

EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_EC) {

        EVPerr(EVP_F_EVP_PKEY_GET0_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);

        return NULL;

    }

    return pkey->pkey.ec;

}

EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)

{

    EC_KEY *ret = EVP_PKEY_get0_EC_KEY(pkey);

    if (ret != NULL)

        EC_KEY_up_ref(ret);

    return ret;

}

#endif

#ifndef OPENSSL_NO_DH

int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)

{

    int ret = EVP_PKEY_assign_DH(pkey, key);

    if (ret)

        DH_up_ref(key);

    return ret;

}

DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey)

{

    if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {

        EVPerr(EVP_F_EVP_PKEY_GET0_DH, EVP_R_EXPECTING_A_DH_KEY);

        return NULL;

    }

    return pkey->pkey.dh;

}

DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)

{

    DH *ret = EVP_PKEY_get0_DH(pkey);

    if (ret != NULL)

        DH_up_ref(ret);

    return ret;

}

#endif

int EVP_PKEY_type(int type)

{

    int ret;

    const EVP_PKEY_ASN1_METHOD *ameth;

    ENGINE *e;

    ameth = EVP_PKEY_asn1_find(&e, type);

    if (ameth)

        ret = ameth->pkey_id;

    else

        ret = NID_undef;

#ifndef OPENSSL_NO_ENGINE

    ENGINE_finish(e);

#endif

    return ret;

}

int EVP_PKEY_id(const EVP_PKEY *pkey)

{

    return pkey->type;

}

int EVP_PKEY_base_id(const EVP_PKEY *pkey)

{

    return EVP_PKEY_type(pkey->type);

}

void EVP_PKEY_free(EVP_PKEY *x)

{

    int i;

    if (x == NULL)

        return;

    CRYPTO_DOWN_REF(&x->references, &i, x->lock);

    REF_PRINT_COUNT("EVP_PKEY", x);

    if (i > 0)

        return;

    REF_ASSERT_ISNT(i < 0);

    EVP_PKEY_free_it(x);

    CRYPTO_THREAD_lock_free(x->lock);

    sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);

    OPENSSL_free(x);

}

static void EVP_PKEY_free_it(EVP_PKEY *x)

{

    /* internal function; x is never NULL */

    if (x->ameth && x->ameth->pkey_free) {

        x->ameth->pkey_free(x);

        x->pkey.ptr = NULL;

    }

#ifndef OPENSSL_NO_ENGINE

    ENGINE_finish(x->engine);

    x->engine = NULL;

    ENGINE_finish(x->pmeth_engine);

    x->pmeth_engine = NULL;

#endif

}

static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,

                     const char *kstr)

{

    BIO_indent(out, indent, 128);

    BIO_printf(out, "%s algorithm \"%s\" unsupported\n",

               kstr, OBJ_nid2ln(pkey->type));

    return 1;

}

int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,

                          int indent, ASN1_PCTX *pctx)

{

    if (pkey->ameth && pkey->ameth->pub_print)

        return pkey->ameth->pub_print(out, pkey, indent, pctx);

    return unsup_alg(out, pkey, indent, "Public Key");

}

int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,

                           int indent, ASN1_PCTX *pctx)

{

    if (pkey->ameth && pkey->ameth->priv_print)

        return pkey->ameth->priv_print(out, pkey, indent, pctx);

    return unsup_alg(out, pkey, indent, "Private Key");

}

int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,

                          int indent, ASN1_PCTX *pctx)

{

    if (pkey->ameth && pkey->ameth->param_print)

        return pkey->ameth->param_print(out, pkey, indent, pctx);

    return unsup_alg(out, pkey, indent, "Parameters");

}

static int evp_pkey_asn1_ctrl(EVP_PKEY *pkey, int op, int arg1, void *arg2)

{

    if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)

        return -2;

    return pkey->ameth->pkey_ctrl(pkey, op, arg1, arg2);

}

int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)

{

    return evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID, 0, pnid);

}

int EVP_PKEY_set1_tls_encodedpoint(EVP_PKEY *pkey,

                               const unsigned char *pt, size_t ptlen)

{

    if (ptlen > INT_MAX)

        return 0;

    if (evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_SET1_TLS_ENCPT, ptlen,

                           (void *)pt) <= 0)

        return 0;

    return 1;

}

size_t EVP_PKEY_get1_tls_encodedpoint(EVP_PKEY *pkey, unsigned char **ppt)

{

    int rv;

    rv = evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_GET1_TLS_ENCPT, 0, ppt);

    if (rv <= 0)

        return 0;

    return rv;

}