/*

 * Copyright 2006-2016 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 <stdlib.h>

#include "internal/cryptlib.h"

#include <openssl/objects.h>

#include <openssl/evp.h>

#include "crypto/evp.h"

#define M_check_autoarg(ctx, arg, arglen, err) \

    if (ctx->pmeth->flags & EVP_PKEY_FLAG_AUTOARGLEN) {           \

        size_t pksize = (size_t)EVP_PKEY_size(ctx->pkey);         \

                                                                  \

        if (pksize == 0) {                                        \

            EVPerr(err, EVP_R_INVALID_KEY); /*ckerr_ignore*/      \

            return 0;                                             \

        }                                                         \

        if (!arg) {                                               \

            *arglen = pksize;                                     \

            return 1;                                             \

        }                                                         \

        if (*arglen < pksize) {                                   \

            EVPerr(err, EVP_R_BUFFER_TOO_SMALL); /*ckerr_ignore*/ \

            return 0;                                             \

        }                                                         \

    }

int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {

        EVPerr(EVP_F_EVP_PKEY_SIGN_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_SIGN;

    if (!ctx->pmeth->sign_init)

        return 1;

    ret = ctx->pmeth->sign_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,

                  unsigned char *sig, size_t *siglen,

                  const unsigned char *tbs, size_t tbslen)

{

    if (!ctx || !ctx->pmeth || !ctx->pmeth->sign) {

        EVPerr(EVP_F_EVP_PKEY_SIGN,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_SIGN) {

        EVPerr(EVP_F_EVP_PKEY_SIGN, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)

        return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);

}

int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {

        EVPerr(EVP_F_EVP_PKEY_VERIFY_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_VERIFY;

    if (!ctx->pmeth->verify_init)

        return 1;

    ret = ctx->pmeth->verify_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,

                    const unsigned char *sig, size_t siglen,

                    const unsigned char *tbs, size_t tbslen)

{

    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify) {

        EVPerr(EVP_F_EVP_PKEY_VERIFY,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_VERIFY) {

        EVPerr(EVP_F_EVP_PKEY_VERIFY, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);

}

int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {

        EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_VERIFYRECOVER;

    if (!ctx->pmeth->verify_recover_init)

        return 1;

    ret = ctx->pmeth->verify_recover_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,

                            unsigned char *rout, size_t *routlen,

                            const unsigned char *sig, size_t siglen)

{

    if (!ctx || !ctx->pmeth || !ctx->pmeth->verify_recover) {

        EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {

        EVPerr(EVP_F_EVP_PKEY_VERIFY_RECOVER, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)

        return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);

}

int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {

        EVPerr(EVP_F_EVP_PKEY_ENCRYPT_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_ENCRYPT;

    if (!ctx->pmeth->encrypt_init)

        return 1;

    ret = ctx->pmeth->encrypt_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,

                     unsigned char *out, size_t *outlen,

                     const unsigned char *in, size_t inlen)

{

    if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {

        EVPerr(EVP_F_EVP_PKEY_ENCRYPT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {

        EVPerr(EVP_F_EVP_PKEY_ENCRYPT, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)

        return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);

}

int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {

        EVPerr(EVP_F_EVP_PKEY_DECRYPT_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_DECRYPT;

    if (!ctx->pmeth->decrypt_init)

        return 1;

    ret = ctx->pmeth->decrypt_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,

                     unsigned char *out, size_t *outlen,

                     const unsigned char *in, size_t inlen)

{

    if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {

        EVPerr(EVP_F_EVP_PKEY_DECRYPT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_DECRYPT) {

        EVPerr(EVP_F_EVP_PKEY_DECRYPT, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)

        return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);

}

int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)

{

    int ret;

    if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE_INIT,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    ctx->operation = EVP_PKEY_OP_DERIVE;

    if (!ctx->pmeth->derive_init)

        return 1;

    ret = ctx->pmeth->derive_init(ctx);

    if (ret <= 0)

        ctx->operation = EVP_PKEY_OP_UNDEFINED;

    return ret;

}

int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)

{

    int ret;

    if (!ctx || !ctx->pmeth

        || !(ctx->pmeth->derive || ctx->pmeth->encrypt || ctx->pmeth->decrypt)

        || !ctx->pmeth->ctrl) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_DERIVE

        && ctx->operation != EVP_PKEY_OP_ENCRYPT

        && ctx->operation != EVP_PKEY_OP_DECRYPT) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,

               EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);

    if (ret <= 0)

        return ret;

    if (ret == 2)

        return 1;

    if (!ctx->pkey) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_NO_KEY_SET);

        return -1;

    }

    if (ctx->pkey->type != peer->type) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_KEY_TYPES);

        return -1;

    }

    /*

     * For clarity.  The error is if parameters in peer are

     * present (!missing) but don't match.  EVP_PKEY_cmp_parameters may return

     * 1 (match), 0 (don't match) and -2 (comparison is not defined).  -1

     * (different key types) is impossible here because it is checked earlier.

     * -2 is OK for us here, as well as 1, so we can check for 0 only.

     */

    if (!EVP_PKEY_missing_parameters(peer) &&

        !EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_PARAMETERS);

        return -1;

    }

    EVP_PKEY_free(ctx->peerkey);

    ctx->peerkey = peer;

    ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);

    if (ret <= 0) {

        ctx->peerkey = NULL;

        return ret;

    }

    EVP_PKEY_up_ref(peer);

    return 1;

}

int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *pkeylen)

{

    if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE,

               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);

        return -2;

    }

    if (ctx->operation != EVP_PKEY_OP_DERIVE) {

        EVPerr(EVP_F_EVP_PKEY_DERIVE, EVP_R_OPERATON_NOT_INITIALIZED);

        return -1;

    }

    M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)

        return ctx->pmeth->derive(ctx, key, pkeylen);

}