/*

 * Copyright 2006-2020 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 "apps.h"

#include "progs.h"

#include <string.h>

#include <openssl/err.h>

#include <openssl/pem.h>

#include <openssl/evp.h>

#define KEY_NONE        0

#define KEY_PRIVKEY     1

#define KEY_PUBKEY      2

#define KEY_CERT        3

static EVP_PKEY_CTX *init_ctx(const char *kdfalg, int *pkeysize,

                              const char *keyfile, int keyform, int key_type,

                              char *passinarg, int pkey_op, ENGINE *e,

                              const int impl);

static int setup_peer(EVP_PKEY_CTX *ctx, int peerform, const char *file,

                      ENGINE *e);

static int do_keyop(EVP_PKEY_CTX *ctx, int pkey_op,

                    unsigned char *out, size_t *poutlen,

                    const unsigned char *in, size_t inlen);

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_ENGINE, OPT_ENGINE_IMPL, OPT_IN, OPT_OUT,

    OPT_PUBIN, OPT_CERTIN, OPT_ASN1PARSE, OPT_HEXDUMP, OPT_SIGN,

    OPT_VERIFY, OPT_VERIFYRECOVER, OPT_REV, OPT_ENCRYPT, OPT_DECRYPT,

    OPT_DERIVE, OPT_SIGFILE, OPT_INKEY, OPT_PEERKEY, OPT_PASSIN,

    OPT_PEERFORM, OPT_KEYFORM, OPT_PKEYOPT, OPT_KDF, OPT_KDFLEN,

    OPT_R_ENUM

} OPTION_CHOICE;

const OPTIONS pkeyutl_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"in", OPT_IN, '<', "Input file - default stdin"},

    {"out", OPT_OUT, '>', "Output file - default stdout"},

    {"pubin", OPT_PUBIN, '-', "Input is a public key"},

    {"certin", OPT_CERTIN, '-', "Input is a cert with a public key"},

    {"asn1parse", OPT_ASN1PARSE, '-', "asn1parse the output data"},

    {"hexdump", OPT_HEXDUMP, '-', "Hex dump output"},

    {"sign", OPT_SIGN, '-', "Sign input data with private key"},

    {"verify", OPT_VERIFY, '-', "Verify with public key"},

    {"verifyrecover", OPT_VERIFYRECOVER, '-',

     "Verify with public key, recover original data"},

    {"rev", OPT_REV, '-', "Reverse the order of the input buffer"},

    {"encrypt", OPT_ENCRYPT, '-', "Encrypt input data with public key"},

    {"decrypt", OPT_DECRYPT, '-', "Decrypt input data with private key"},

    {"derive", OPT_DERIVE, '-', "Derive shared secret"},

    {"kdf", OPT_KDF, 's', "Use KDF algorithm"},

    {"kdflen", OPT_KDFLEN, 'p', "KDF algorithm output length"},

    {"sigfile", OPT_SIGFILE, '<', "Signature file (verify operation only)"},

    {"inkey", OPT_INKEY, 's', "Input private key file"},

    {"peerkey", OPT_PEERKEY, 's', "Peer key file used in key derivation"},

    {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},

    {"peerform", OPT_PEERFORM, 'E', "Peer key format - default PEM"},

    {"keyform", OPT_KEYFORM, 'E', "Private key format - default PEM"},

    {"pkeyopt", OPT_PKEYOPT, 's', "Public key options as opt:value"},

    OPT_R_OPTIONS,

#ifndef OPENSSL_NO_ENGINE

    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},

    {"engine_impl", OPT_ENGINE_IMPL, '-',

     "Also use engine given by -engine for crypto operations"},

#endif

    {NULL}

};

int pkeyutl_main(int argc, char **argv)

{

    BIO *in = NULL, *out = NULL;

    ENGINE *e = NULL;

    EVP_PKEY_CTX *ctx = NULL;

    char *infile = NULL, *outfile = NULL, *sigfile = NULL, *passinarg = NULL;

    char hexdump = 0, asn1parse = 0, rev = 0, *prog;

    unsigned char *buf_in = NULL, *buf_out = NULL, *sig = NULL;

    OPTION_CHOICE o;

    int buf_inlen = 0, siglen = -1, keyform = FORMAT_PEM, peerform = FORMAT_PEM;

    int keysize = -1, pkey_op = EVP_PKEY_OP_SIGN, key_type = KEY_PRIVKEY;

    int engine_impl = 0;

    int ret = 1, rv = -1;

    size_t buf_outlen;

    const char *inkey = NULL;

    const char *peerkey = NULL;

    const char *kdfalg = NULL;

    int kdflen = 0;

    STACK_OF(OPENSSL_STRING) *pkeyopts = NULL;

    prog = opt_init(argc, argv, pkeyutl_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);

            goto end;

        case OPT_HELP:

            opt_help(pkeyutl_options);

            ret = 0;

            goto end;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        case OPT_SIGFILE:

            sigfile = opt_arg();

            break;

        case OPT_ENGINE_IMPL:

            engine_impl = 1;

            break;

        case OPT_INKEY:

            inkey = opt_arg();

            break;

        case OPT_PEERKEY:

            peerkey = opt_arg();

            break;

        case OPT_PASSIN:

            passinarg = opt_arg();

            break;

        case OPT_PEERFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PDE, &peerform))

                goto opthelp;

            break;

        case OPT_KEYFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PDE, &keyform))

                goto opthelp;

            break;

        case OPT_R_CASES:

            if (!opt_rand(o))

                goto end;

            break;

        case OPT_ENGINE:

            e = setup_engine(opt_arg(), 0);

            break;

        case OPT_PUBIN:

            key_type = KEY_PUBKEY;

            break;

        case OPT_CERTIN:

            key_type = KEY_CERT;

            break;

        case OPT_ASN1PARSE:

            asn1parse = 1;

            break;

        case OPT_HEXDUMP:

            hexdump = 1;

            break;

        case OPT_SIGN:

            pkey_op = EVP_PKEY_OP_SIGN;

            break;

        case OPT_VERIFY:

            pkey_op = EVP_PKEY_OP_VERIFY;

            break;

        case OPT_VERIFYRECOVER:

            pkey_op = EVP_PKEY_OP_VERIFYRECOVER;

            break;

        case OPT_ENCRYPT:

            pkey_op = EVP_PKEY_OP_ENCRYPT;

            break;

        case OPT_DECRYPT:

            pkey_op = EVP_PKEY_OP_DECRYPT;

            break;

        case OPT_DERIVE:

            pkey_op = EVP_PKEY_OP_DERIVE;

            break;

        case OPT_KDF:

            pkey_op = EVP_PKEY_OP_DERIVE;

            key_type = KEY_NONE;

            kdfalg = opt_arg();

            break;

        case OPT_KDFLEN:

            kdflen = atoi(opt_arg());

            break;

        case OPT_REV:

            rev = 1;

            break;

        case OPT_PKEYOPT:

            if ((pkeyopts == NULL &&

                 (pkeyopts = sk_OPENSSL_STRING_new_null()) == NULL) ||

                sk_OPENSSL_STRING_push(pkeyopts, opt_arg()) == 0) {

                BIO_puts(bio_err, "out of memory\n");

                goto end;

            }

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    if (kdfalg != NULL) {

        if (kdflen == 0) {

            BIO_printf(bio_err,

                       "%s: no KDF length given (-kdflen parameter).\n", prog);

            goto opthelp;

        }

    } else if (inkey == NULL) {

        BIO_printf(bio_err,

                   "%s: no private key given (-inkey parameter).\n", prog);

        goto opthelp;

    } else if (peerkey != NULL && pkey_op != EVP_PKEY_OP_DERIVE) {

        BIO_printf(bio_err,

                   "%s: no peer key given (-peerkey parameter).\n", prog);

        goto opthelp;

    }

    ctx = init_ctx(kdfalg, &keysize, inkey, keyform, key_type,

                   passinarg, pkey_op, e, engine_impl);

    if (ctx == NULL) {

        BIO_printf(bio_err, "%s: Error initializing context\n", prog);

        ERR_print_errors(bio_err);

        goto end;

    }

    if (peerkey != NULL && !setup_peer(ctx, peerform, peerkey, e)) {

        BIO_printf(bio_err, "%s: Error setting up peer key\n", prog);

        ERR_print_errors(bio_err);

        goto end;

    }

    if (pkeyopts != NULL) {

        int num = sk_OPENSSL_STRING_num(pkeyopts);

        int i;

        for (i = 0; i < num; ++i) {

            const char *opt = sk_OPENSSL_STRING_value(pkeyopts, i);

            if (pkey_ctrl_string(ctx, opt) <= 0) {

                BIO_printf(bio_err, "%s: Can't set parameter \"%s\":\n",

                           prog, opt);

                ERR_print_errors(bio_err);

                goto end;

            }

        }

    }

    if (sigfile != NULL && (pkey_op != EVP_PKEY_OP_VERIFY)) {

        BIO_printf(bio_err,

                   "%s: Signature file specified for non verify\n", prog);

        goto end;

    }

    if (sigfile == NULL && (pkey_op == EVP_PKEY_OP_VERIFY)) {

        BIO_printf(bio_err,

                   "%s: No signature file specified for verify\n", prog);

        goto end;

    }

    if (pkey_op != EVP_PKEY_OP_DERIVE) {

        in = bio_open_default(infile, 'r', FORMAT_BINARY);

        if (in == NULL)

            goto end;

    }

    out = bio_open_default(outfile, 'w', FORMAT_BINARY);

    if (out == NULL)

        goto end;

    if (sigfile != NULL) {

        BIO *sigbio = BIO_new_file(sigfile, "rb");

        if (sigbio == NULL) {

            BIO_printf(bio_err, "Can't open signature file %s\n", sigfile);

            goto end;

        }

        siglen = bio_to_mem(&sig, keysize * 10, sigbio);

        BIO_free(sigbio);

        if (siglen < 0) {

            BIO_printf(bio_err, "Error reading signature data\n");

            goto end;

        }

    }

    if (in != NULL) {

        /* Read the input data */

        buf_inlen = bio_to_mem(&buf_in, keysize * 10, in);

        if (buf_inlen < 0) {

            BIO_printf(bio_err, "Error reading input Data\n");

            goto end;

        }

        if (rev) {

            size_t i;

            unsigned char ctmp;

            size_t l = (size_t)buf_inlen;

            for (i = 0; i < l / 2; i++) {

                ctmp = buf_in[i];

                buf_in[i] = buf_in[l - 1 - i];

                buf_in[l - 1 - i] = ctmp;

            }

        }

    }

    /* Sanity check the input */

    if (buf_inlen > EVP_MAX_MD_SIZE

            && (pkey_op == EVP_PKEY_OP_SIGN

                || pkey_op == EVP_PKEY_OP_VERIFY)) {

        BIO_printf(bio_err,

                   "Error: The input data looks too long to be a hash\n");

        goto end;

    }

    if (pkey_op == EVP_PKEY_OP_VERIFY) {

        rv = EVP_PKEY_verify(ctx, sig, (size_t)siglen,

                             buf_in, (size_t)buf_inlen);

        if (rv == 1) {

            BIO_puts(out, "Signature Verified Successfully\n");

            ret = 0;

        } else {

            BIO_puts(out, "Signature Verification Failure\n");

        }

        goto end;

    }

    if (kdflen != 0) {

        buf_outlen = kdflen;

        rv = 1;

    } else {

        rv = do_keyop(ctx, pkey_op, NULL, (size_t *)&buf_outlen,

                      buf_in, (size_t)buf_inlen);

    }

    if (rv > 0 && buf_outlen != 0) {

        buf_out = app_malloc(buf_outlen, "buffer output");

        rv = do_keyop(ctx, pkey_op,

                      buf_out, (size_t *)&buf_outlen,

                      buf_in, (size_t)buf_inlen);

    }

    if (rv <= 0) {

        if (pkey_op != EVP_PKEY_OP_DERIVE) {

            BIO_puts(bio_err, "Public Key operation error\n");

        } else {

            BIO_puts(bio_err, "Key derivation failed\n");

        }

        ERR_print_errors(bio_err);

        goto end;

    }

    ret = 0;

    if (asn1parse) {

        if (!ASN1_parse_dump(out, buf_out, buf_outlen, 1, -1))

            ERR_print_errors(bio_err);

    } else if (hexdump) {

        BIO_dump(out, (char *)buf_out, buf_outlen);

    } else {

        BIO_write(out, buf_out, buf_outlen);

    }

 end:

    EVP_PKEY_CTX_free(ctx);

    release_engine(e);

    BIO_free(in);

    BIO_free_all(out);

    OPENSSL_free(buf_in);

    OPENSSL_free(buf_out);

    OPENSSL_free(sig);

    sk_OPENSSL_STRING_free(pkeyopts);

    return ret;

}

static EVP_PKEY_CTX *init_ctx(const char *kdfalg, int *pkeysize,

                              const char *keyfile, int keyform, int key_type,

                              char *passinarg, int pkey_op, ENGINE *e,

                              const int engine_impl)

{

    EVP_PKEY *pkey = NULL;

    EVP_PKEY_CTX *ctx = NULL;

    ENGINE *impl = NULL;

    char *passin = NULL;

    int rv = -1;

    X509 *x;

    if (((pkey_op == EVP_PKEY_OP_SIGN) || (pkey_op == EVP_PKEY_OP_DECRYPT)

         || (pkey_op == EVP_PKEY_OP_DERIVE))

        && (key_type != KEY_PRIVKEY && kdfalg == NULL)) {

        BIO_printf(bio_err, "A private key is needed for this operation\n");

        goto end;

    }

    if (!app_passwd(passinarg, NULL, &passin, NULL)) {

        BIO_printf(bio_err, "Error getting password\n");

        goto end;

    }

    switch (key_type) {

    case KEY_PRIVKEY:

        pkey = load_key(keyfile, keyform, 0, passin, e, "Private Key");

        break;

    case KEY_PUBKEY:

        pkey = load_pubkey(keyfile, keyform, 0, NULL, e, "Public Key");

        break;

    case KEY_CERT:

        x = load_cert(keyfile, keyform, "Certificate");

        if (x) {

            pkey = X509_get_pubkey(x);

            X509_free(x);

        }

        break;

    case KEY_NONE:

        break;

    }

#ifndef OPENSSL_NO_ENGINE

    if (engine_impl)

        impl = e;

#endif

    if (kdfalg != NULL) {

        int kdfnid = OBJ_sn2nid(kdfalg);

        if (kdfnid == NID_undef) {

            kdfnid = OBJ_ln2nid(kdfalg);

            if (kdfnid == NID_undef) {

                BIO_printf(bio_err, "The given KDF \"%s\" is unknown.\n",

                           kdfalg);

                goto end;

            }

        }

        ctx = EVP_PKEY_CTX_new_id(kdfnid, impl);

    } else {

        if (pkey == NULL)

            goto end;

        *pkeysize = EVP_PKEY_size(pkey);

        ctx = EVP_PKEY_CTX_new(pkey, impl);

        EVP_PKEY_free(pkey);

    }

    if (ctx == NULL)

        goto end;

    switch (pkey_op) {

    case EVP_PKEY_OP_SIGN:

        rv = EVP_PKEY_sign_init(ctx);

        break;

    case EVP_PKEY_OP_VERIFY:

        rv = EVP_PKEY_verify_init(ctx);

        break;

    case EVP_PKEY_OP_VERIFYRECOVER:

        rv = EVP_PKEY_verify_recover_init(ctx);

        break;

    case EVP_PKEY_OP_ENCRYPT:

        rv = EVP_PKEY_encrypt_init(ctx);

        break;

    case EVP_PKEY_OP_DECRYPT:

        rv = EVP_PKEY_decrypt_init(ctx);

        break;

    case EVP_PKEY_OP_DERIVE:

        rv = EVP_PKEY_derive_init(ctx);

        break;

    }

    if (rv <= 0) {

        EVP_PKEY_CTX_free(ctx);

        ctx = NULL;

    }

 end:

    OPENSSL_free(passin);

    return ctx;

}

static int setup_peer(EVP_PKEY_CTX *ctx, int peerform, const char *file,

                      ENGINE *e)

{

    EVP_PKEY *peer = NULL;

    ENGINE *engine = NULL;

    int ret;

    if (peerform == FORMAT_ENGINE)

        engine = e;

    peer = load_pubkey(file, peerform, 0, NULL, engine, "Peer Key");

    if (peer == NULL) {

        BIO_printf(bio_err, "Error reading peer key %s\n", file);

        ERR_print_errors(bio_err);

        return 0;

    }

    ret = EVP_PKEY_derive_set_peer(ctx, peer);

    EVP_PKEY_free(peer);

    if (ret <= 0)

        ERR_print_errors(bio_err);

    return ret;

}

static int do_keyop(EVP_PKEY_CTX *ctx, int pkey_op,

                    unsigned char *out, size_t *poutlen,

                    const unsigned char *in, size_t inlen)

{

    int rv = 0;

    switch (pkey_op) {

    case EVP_PKEY_OP_VERIFYRECOVER:

        rv = EVP_PKEY_verify_recover(ctx, out, poutlen, in, inlen);

        break;

    case EVP_PKEY_OP_SIGN:

        rv = EVP_PKEY_sign(ctx, out, poutlen, in, inlen);

        break;

    case EVP_PKEY_OP_ENCRYPT:

        rv = EVP_PKEY_encrypt(ctx, out, poutlen, in, inlen);

        break;

    case EVP_PKEY_OP_DECRYPT:

        rv = EVP_PKEY_decrypt(ctx, out, poutlen, in, inlen);

        break;

    case EVP_PKEY_OP_DERIVE:

        rv = EVP_PKEY_derive(ctx, out, poutlen);

        break;

    }

    return rv;

}