Remove outdated and unsupported CHIL engine

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3389)

4 files changed, 0 insertions, 1457 deletions

diff --git a/demos/engines/e_chil.c b/demos/engines/e_chil.c
deleted file mode 100644
index 74b9c86ba1..0000000000
--- a/demos/engines/e_chil.c
+++ /dev/null
@@ -1,1281 +0,0 @@
-/*
- * Copyright 2000-2016 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 <string.h>
-#include <openssl/crypto.h>
-#include <openssl/pem.h>
-#include "internal/dso.h"
-#include <openssl/engine.h>
-#include <openssl/ui.h>
-#include <openssl/rand.h>
-#ifndef OPENSSL_NO_RSA
-# include <openssl/rsa.h>
-#endif
-#ifndef OPENSSL_NO_DH
-# include <openssl/dh.h>
-#endif
-#include <openssl/bn.h>
-
-#ifndef OPENSSL_NO_HW
-# ifndef OPENSSL_NO_HW_CHIL
-
-/*-
- * Attribution notice: nCipher have said several times that it's OK for
- * us to implement a general interface to their boxes, and recently declared
- * their HWCryptoHook to be public, and therefore available for us to use.
- * Thanks, nCipher.
- *
- * The hwcryptohook.h included here is from May 2000.
- * [Richard Levitte]
- */
-# include "vendor_defns/hwcryptohook.h"
-
-#  define HWCRHK_LIB_NAME "CHIL engine"
-#  include "e_chil_err.c"
-
-static CRYPTO_RWLOCK *chil_lock;
-
-static int hwcrhk_destroy(ENGINE *e);
-static int hwcrhk_init(ENGINE *e);
-static int hwcrhk_finish(ENGINE *e);
-static int hwcrhk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void));
-
-/* Functions to handle mutexes */
-static int hwcrhk_mutex_init(HWCryptoHook_Mutex *,
-                             HWCryptoHook_CallerContext *);
-static int hwcrhk_mutex_lock(HWCryptoHook_Mutex *);
-static void hwcrhk_mutex_unlock(HWCryptoHook_Mutex *);
-static void hwcrhk_mutex_destroy(HWCryptoHook_Mutex *);
-
-/* BIGNUM stuff */
-static int hwcrhk_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
-                          const BIGNUM *m, BN_CTX *ctx);
-
-#  ifndef OPENSSL_NO_RSA
-/* RSA stuff */
-static int hwcrhk_rsa_mod_exp(BIGNUM *r, const BIGNUM *I, RSA *rsa,
-                              BN_CTX *ctx);
-/* This function is aliased to mod_exp (with the mont stuff dropped). */
-static int hwcrhk_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
-                               const BIGNUM *m, BN_CTX *ctx,
-                               BN_MONT_CTX *m_ctx);
-static int hwcrhk_rsa_finish(RSA *rsa);
-#  endif
-
-#  ifndef OPENSSL_NO_DH
-/* DH stuff */
-/* This function is alised to mod_exp (with the DH and mont dropped). */
-static int hwcrhk_mod_exp_dh(const DH *dh, BIGNUM *r,
-                             const BIGNUM *a, const BIGNUM *p,
-                             const BIGNUM *m, BN_CTX *ctx,
-                             BN_MONT_CTX *m_ctx);
-#  endif
-
-/* RAND stuff */
-static int hwcrhk_rand_bytes(unsigned char *buf, int num);
-static int hwcrhk_rand_status(void);
-
-/* KM stuff */
-static EVP_PKEY *hwcrhk_load_privkey(ENGINE *eng, const char *key_id,
-                                     UI_METHOD *ui_method,
-                                     void *callback_data);
-static EVP_PKEY *hwcrhk_load_pubkey(ENGINE *eng, const char *key_id,
-                                    UI_METHOD *ui_method,
-                                    void *callback_data);
-
-/* Interaction stuff */
-static int hwcrhk_insert_card(const char *prompt_info,
-                              const char *wrong_info,
-                              HWCryptoHook_PassphraseContext * ppctx,
-                              HWCryptoHook_CallerContext * cactx);
-static int hwcrhk_get_pass(const char *prompt_info,
-                           int *len_io, char *buf,
-                           HWCryptoHook_PassphraseContext * ppctx,
-                           HWCryptoHook_CallerContext * cactx);
-static void hwcrhk_log_message(void *logstr, const char *message);
-
-/* The definitions for control commands specific to this engine */
-#  define HWCRHK_CMD_SO_PATH              ENGINE_CMD_BASE
-#  define HWCRHK_CMD_FORK_CHECK           (ENGINE_CMD_BASE + 1)
-#  define HWCRHK_CMD_THREAD_LOCKING       (ENGINE_CMD_BASE + 2)
-#  define HWCRHK_CMD_SET_USER_INTERFACE   (ENGINE_CMD_BASE + 3)
-#  define HWCRHK_CMD_SET_CALLBACK_DATA    (ENGINE_CMD_BASE + 4)
-static const ENGINE_CMD_DEFN hwcrhk_cmd_defns[] = {
-    {HWCRHK_CMD_SO_PATH,
-     "SO_PATH",
-     "Specifies the path to the 'hwcrhk' shared library",
-     ENGINE_CMD_FLAG_STRING},
-    {HWCRHK_CMD_FORK_CHECK,
-     "FORK_CHECK",
-     "Turns fork() checking on (non-zero) or off (zero)",
-     ENGINE_CMD_FLAG_NUMERIC},
-    {HWCRHK_CMD_THREAD_LOCKING,
-     "THREAD_LOCKING",
-     "Turns thread-safe locking on (zero) or off (non-zero)",
-     ENGINE_CMD_FLAG_NUMERIC},
-    {HWCRHK_CMD_SET_USER_INTERFACE,
-     "SET_USER_INTERFACE",
-     "Set the global user interface (internal)",
-     ENGINE_CMD_FLAG_INTERNAL},
-    {HWCRHK_CMD_SET_CALLBACK_DATA,
-     "SET_CALLBACK_DATA",
-     "Set the global user interface extra data (internal)",
-     ENGINE_CMD_FLAG_INTERNAL},
-    {0, NULL, NULL, 0}
-};
-
-#  ifndef OPENSSL_NO_RSA
-/* Our internal RSA_METHOD that we provide pointers to */
-static RSA_METHOD hwcrhk_rsa = {
-    "CHIL RSA method",
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-    hwcrhk_rsa_mod_exp,
-    hwcrhk_mod_exp_mont,
-    NULL,
-    hwcrhk_rsa_finish,
-    0,
-    NULL,
-    NULL,
-    NULL,
-    NULL
-};
-#  endif
-
-#  ifndef OPENSSL_NO_DH
-/* Our internal DH_METHOD that we provide pointers to */
-static DH_METHOD hwcrhk_dh = {
-    "CHIL DH method",
-    NULL,
-    NULL,
-    hwcrhk_mod_exp_dh,
-    NULL,
-    NULL,
-    0,
-    NULL,
-    NULL
-};
-#  endif
-
-static RAND_METHOD hwcrhk_rand = {
-    /* "CHIL RAND method", */
-    NULL,
-    hwcrhk_rand_bytes,
-    NULL,
-    NULL,
-    hwcrhk_rand_bytes,
-    hwcrhk_rand_status,
-};
-
-/* Constants used when creating the ENGINE */
-static const char *engine_hwcrhk_id = "chil";
-static const char *engine_hwcrhk_name = "CHIL hardware engine support";
-#  ifndef OPENSSL_NO_DYNAMIC_ENGINE
-/* Compatibility hack, the dynamic library uses this form in the path */
-static const char *engine_hwcrhk_id_alt = "ncipher";
-#  endif
-
-/* Internal stuff for HWCryptoHook */
-
-/* Some structures needed for proper use of thread locks */
-/*
- * hwcryptohook.h has some typedefs that turn struct HWCryptoHook_MutexValue
- * into HWCryptoHook_Mutex
- */
-struct HWCryptoHook_MutexValue {
-    CRYPTO_RWLOCK *lock;
-};
-
-/*
- * hwcryptohook.h has some typedefs that turn struct
- * HWCryptoHook_PassphraseContextValue into HWCryptoHook_PassphraseContext
- */
-struct HWCryptoHook_PassphraseContextValue {
-    UI_METHOD *ui_method;
-    void *callback_data;
-};
-
-/*
- * hwcryptohook.h has some typedefs that turn struct
- * HWCryptoHook_CallerContextValue into HWCryptoHook_CallerContext
- */
-struct HWCryptoHook_CallerContextValue {
-    pem_password_cb *password_callback; /* Deprecated! Only present for
-                                         * backward compatibility! */
-    UI_METHOD *ui_method;
-    void *callback_data;
-};
-
-/*
- * The MPI structure in HWCryptoHook is pretty compatible with OpenSSL
- * BIGNUM's, so lets define a couple of conversion macros
- */
-#  define BN2MPI(mp, bn) \
-    {mp.size = bn->top * sizeof(BN_ULONG); mp.buf = (unsigned char *)bn->d;}
-#  define MPI2BN(bn, mp) \
-    {mp.size = bn->dmax * sizeof(BN_ULONG); mp.buf = (unsigned char *)bn->d;}
-
-static BIO *logstream = NULL;
-static int disable_mutex_callbacks = 0;
-
-/*
- * One might wonder why these are needed, since one can pass down at least a
- * UI_METHOD and a pointer to callback data to the key-loading functions. The
- * thing is that the ModExp and RSAImmed functions can load keys as well, if
- * the data they get is in a special, nCipher-defined format (hint: if you
- * look at the private exponent of the RSA data as a string, you'll see this
- * string: "nCipher KM tool key id", followed by some bytes, followed a key
- * identity string, followed by more bytes.  This happens when you use
- * "embed" keys instead of "hwcrhk" keys).  Unfortunately, those functions do
- * not take any passphrase or caller context, and our functions can't really
- * take any callback data either.  Still, the "insert_card" and
- * "get_passphrase" callbacks may be called down the line, and will need to
- * know what user interface callbacks to call, and having callback data from
- * the application may be a nice thing as well, so we need to keep track of
- * that globally.
- */
-static HWCryptoHook_CallerContext password_context = { NULL, NULL, NULL };
-
-/* Stuff to pass to the HWCryptoHook library */
-static HWCryptoHook_InitInfo hwcrhk_globals = {
-    HWCryptoHook_InitFlags_SimpleForkCheck, /* Flags */
-    &logstream,                 /* logstream */
-    sizeof(BN_ULONG),           /* limbsize */
-    0,                          /* mslimb first: false for BNs */
-    -1,                         /* msbyte first: use native */
-    0,                          /* Max mutexes, 0 = no small limit */
-    0,                          /* Max simultaneous, 0 = default */
-
-    /*
-     * The next few are mutex stuff: we write wrapper functions around the OS
-     * mutex functions.  We initialise them to 0 here, and change that to
-     * actual function pointers in hwcrhk_init() if dynamic locks are
-     * supported (that is, if the application programmer has made sure of
-     * setting up callbacks bafore starting this engine) *and* if
-     * disable_mutex_callbacks hasn't been set by a call to
-     * ENGINE_ctrl(ENGINE_CTRL_CHIL_NO_LOCKING).
-     */
-    sizeof(HWCryptoHook_Mutex),
-    0,
-    0,
-    0,
-    0,
-
-    /*
-     * The next few are condvar stuff: we write wrapper functions round the
-     * OS functions.  Currently not implemented and not and absolute
-     * necessity even in threaded programs, therefore 0'ed.  Will hopefully
-     * be implemented some day, since it enhances the efficiency of
-     * HWCryptoHook.
-     */
-    0,                          /* sizeof(HWCryptoHook_CondVar), */
-    0,                          /* hwcrhk_cv_init, */
-    0,                          /* hwcrhk_cv_wait, */
-    0,                          /* hwcrhk_cv_signal, */
-    0,                          /* hwcrhk_cv_broadcast, */
-    0,                          /* hwcrhk_cv_destroy, */
-
-    hwcrhk_get_pass,            /* pass phrase */
-    hwcrhk_insert_card,         /* insert a card */
-    hwcrhk_log_message          /* Log message */
-};
-
-/* Now, to our own code */
-
-/*
- * This internal function is used by ENGINE_chil() and possibly by the
- * "dynamic" ENGINE support too
- */
-static int bind_helper(ENGINE *e)
-{
-#  ifndef OPENSSL_NO_RSA
-    const RSA_METHOD *meth1;
-#  endif
-#  ifndef OPENSSL_NO_DH
-    const DH_METHOD *meth2;
-#  endif
-
-    chil_lock = CRYPTO_THREAD_lock_new();
-    if (chil_lock == NULL) {
-        HWCRHKerr(HWCRHK_F_BIND_HELPER, ERR_R_MALLOC_FAILURE);
-        return 0;
-    }
-
-    if (!ENGINE_set_id(e, engine_hwcrhk_id) ||
-        !ENGINE_set_name(e, engine_hwcrhk_name) ||
-#  ifndef OPENSSL_NO_RSA
-        !ENGINE_set_RSA(e, &hwcrhk_rsa) ||
-#  endif
-#  ifndef OPENSSL_NO_DH
-        !ENGINE_set_DH(e, &hwcrhk_dh) ||
-#  endif
-        !ENGINE_set_RAND(e, &hwcrhk_rand) ||
-        !ENGINE_set_destroy_function(e, hwcrhk_destroy) ||
-        !ENGINE_set_init_function(e, hwcrhk_init) ||
-        !ENGINE_set_finish_function(e, hwcrhk_finish) ||
-        !ENGINE_set_ctrl_function(e, hwcrhk_ctrl) ||
-        !ENGINE_set_load_privkey_function(e, hwcrhk_load_privkey) ||
-        !ENGINE_set_load_pubkey_function(e, hwcrhk_load_pubkey) ||
-        !ENGINE_set_cmd_defns(e, hwcrhk_cmd_defns))
-        return 0;
-
-#  ifndef OPENSSL_NO_RSA
-    /*
-     * We know that the "PKCS1_OpenSSL()" functions hook properly to the
-     * cswift-specific mod_exp and mod_exp_crt so we use those functions. NB:
-     * We don't use ENGINE_openssl() or anything "more generic" because
-     * something like the RSAref code may not hook properly, and if you own
-     * one of these cards then you have the right to do RSA operations on it
-     * anyway!
-     */
-    meth1 = RSA_PKCS1_OpenSSL();
-    hwcrhk_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
-    hwcrhk_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
-    hwcrhk_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
-    hwcrhk_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
-#  endif
-
-#  ifndef OPENSSL_NO_DH
-    /* Much the same for Diffie-Hellman */
-    meth2 = DH_OpenSSL();
-    hwcrhk_dh.generate_key = meth2->generate_key;
-    hwcrhk_dh.compute_key = meth2->compute_key;
-#  endif
-
-    /* Ensure the hwcrhk error handling is set up */
-    ERR_load_HWCRHK_strings();
-
-    return 1;
-}
-
-#  ifdef OPENSSL_NO_DYNAMIC_ENGINE
-static ENGINE *engine_chil(void)
-{
-    ENGINE *ret = ENGINE_new();
-    if (ret == NULL)
-        return NULL;
-    if (!bind_helper(ret)) {
-        ENGINE_free(ret);
-        return NULL;
-    }
-    return ret;
-}
-
-void ENGINE_load_chil(void)
-{
-    /* Copied from eng_[openssl|dyn].c */
-    ENGINE *toadd = engine_chil();
-    if (!toadd)
-        return;
-    ENGINE_add(toadd);
-    ENGINE_free(toadd);
-    ERR_clear_error();
-}
-#  endif
-
-/*
- * This is a process-global DSO handle used for loading and unloading the
- * HWCryptoHook library. NB: This is only set (or unset) during an init() or
- * finish() call (reference counts permitting) and they're operating with
- * global locks, so this should be thread-safe implicitly.
- */
-static DSO *hwcrhk_dso = NULL;
-static HWCryptoHook_ContextHandle hwcrhk_context = 0;
-#  ifndef OPENSSL_NO_RSA
-/* Index for KM handle.  Not really used yet. */
-static int hndidx_rsa = -1;
-#  endif
-
-/*
- * These are the function pointers that are (un)set when the library has
- * successfully (un)loaded.
- */
-static HWCryptoHook_Init_t *p_hwcrhk_Init = NULL;
-static HWCryptoHook_Finish_t *p_hwcrhk_Finish = NULL;
-static HWCryptoHook_ModExp_t *p_hwcrhk_ModExp = NULL;
-#  ifndef OPENSSL_NO_RSA
-static HWCryptoHook_RSA_t *p_hwcrhk_RSA = NULL;
-#  endif
-static HWCryptoHook_RandomBytes_t *p_hwcrhk_RandomBytes = NULL;
-#  ifndef OPENSSL_NO_RSA
-static HWCryptoHook_RSALoadKey_t *p_hwcrhk_RSALoadKey = NULL;
-static HWCryptoHook_RSAGetPublicKey_t *p_hwcrhk_RSAGetPublicKey = NULL;
-static HWCryptoHook_RSAUnloadKey_t *p_hwcrhk_RSAUnloadKey = NULL;
-#  endif
-static HWCryptoHook_ModExpCRT_t *p_hwcrhk_ModExpCRT = NULL;
-
-/* Used in the DSO operations. */
-static const char *HWCRHK_LIBNAME = NULL;
-static void free_HWCRHK_LIBNAME(void)
-{
-    OPENSSL_free(HWCRHK_LIBNAME);
-    HWCRHK_LIBNAME = NULL;
-}
-
-static const char *get_HWCRHK_LIBNAME(void)
-{
-    if (HWCRHK_LIBNAME)
-        return HWCRHK_LIBNAME;
-    return "nfhwcrhk";
-}
-
-static long set_HWCRHK_LIBNAME(const char *name)
-{
-    free_HWCRHK_LIBNAME();
-    return (((HWCRHK_LIBNAME = OPENSSL_strdup(name)) != NULL) ? 1 : 0);
-}
-
-static const char *n_hwcrhk_Init = "HWCryptoHook_Init";
-static const char *n_hwcrhk_Finish = "HWCryptoHook_Finish";
-static const char *n_hwcrhk_ModExp = "HWCryptoHook_ModExp";
-#  ifndef OPENSSL_NO_RSA
-static const char *n_hwcrhk_RSA = "HWCryptoHook_RSA";
-#  endif
-static const char *n_hwcrhk_RandomBytes = "HWCryptoHook_RandomBytes";
-#  ifndef OPENSSL_NO_RSA
-static const char *n_hwcrhk_RSALoadKey = "HWCryptoHook_RSALoadKey";
-static const char *n_hwcrhk_RSAGetPublicKey = "HWCryptoHook_RSAGetPublicKey";
-static const char *n_hwcrhk_RSAUnloadKey = "HWCryptoHook_RSAUnloadKey";
-#  endif
-static const char *n_hwcrhk_ModExpCRT = "HWCryptoHook_ModExpCRT";
-
-/*
- * HWCryptoHook library functions and mechanics - these are used by the
- * higher-level functions further down. NB: As and where there's no error
- * checking, take a look lower down where these functions are called, the
- * checking and error handling is probably down there.
- */
-
-/* utility function to obtain a context */
-static int get_context(HWCryptoHook_ContextHandle * hac,
-                       HWCryptoHook_CallerContext * cac)
-{
-    char tempbuf[1024];
-    HWCryptoHook_ErrMsgBuf rmsg;
-
-    rmsg.buf = tempbuf;
-    rmsg.size = sizeof(tempbuf);
-
-    *hac = p_hwcrhk_Init(&hwcrhk_globals, sizeof(hwcrhk_globals), &rmsg, cac);
-    if (!*hac)
-        return 0;
-    return 1;
-}
-
-/* similarly to release one. */
-static void release_context(HWCryptoHook_ContextHandle hac)
-{
-    p_hwcrhk_Finish(hac);
-}
-
-/* Destructor (complements the "ENGINE_chil()" constructor) */
-static int hwcrhk_destroy(ENGINE *e)
-{
-    free_HWCRHK_LIBNAME();
-    ERR_unload_HWCRHK_strings();
-    CRYPTO_THREAD_lock_free(chil_lock);
-    return 1;
-}
-
-/* (de)initialisation functions. */
-static int hwcrhk_init(ENGINE *e)
-{
-    HWCryptoHook_Init_t *p1;
-    HWCryptoHook_Finish_t *p2;
-    HWCryptoHook_ModExp_t *p3;
-#  ifndef OPENSSL_NO_RSA
-    HWCryptoHook_RSA_t *p4;
-    HWCryptoHook_RSALoadKey_t *p5;
-    HWCryptoHook_RSAGetPublicKey_t *p6;
-    HWCryptoHook_RSAUnloadKey_t *p7;
-#  endif
-    HWCryptoHook_RandomBytes_t *p8;
-    HWCryptoHook_ModExpCRT_t *p9;
-
-    if (hwcrhk_dso != NULL) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_INIT, HWCRHK_R_ALREADY_LOADED);
-        goto err;
-    }
-    /* Attempt to load libnfhwcrhk.so/nfhwcrhk.dll/whatever. */
-    hwcrhk_dso = DSO_load(NULL, get_HWCRHK_LIBNAME(), NULL, 0);
-    if (hwcrhk_dso == NULL) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_INIT, HWCRHK_R_DSO_FAILURE);
-        goto err;
-    }
-
-#define BINDIT(t, name) (t *)DSO_bind_func(hwcrhk_dso, name)
-    if ((p1 = BINDIT(HWCryptoHook_Init_t, n_hwcrhk_Init)) == NULL
-        || (p2 = BINDIT(HWCryptoHook_Finish_t, n_hwcrhk_Finish)) == NULL
-        || (p3 = BINDIT(HWCryptoHook_ModExp_t, n_hwcrhk_ModExp)) == NULL
-#  ifndef OPENSSL_NO_RSA
-        || (p4 = BINDIT(HWCryptoHook_RSA_t, n_hwcrhk_RSA)) == NULL
-        || (p5 = BINDIT(HWCryptoHook_RSALoadKey_t, n_hwcrhk_RSALoadKey)) == NULL
-        || (p6 = BINDIT(HWCryptoHook_RSAGetPublicKey_t, n_hwcrhk_RSAGetPublicKey)) == NULL
-        || (p7 = BINDIT(HWCryptoHook_RSAUnloadKey_t, n_hwcrhk_RSAUnloadKey)) == NULL
-#  endif
-        || (p8 = BINDIT(HWCryptoHook_RandomBytes_t, n_hwcrhk_RandomBytes)) == NULL
-        || (p9 = BINDIT(HWCryptoHook_ModExpCRT_t, n_hwcrhk_ModExpCRT)) == NULL) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_INIT, HWCRHK_R_DSO_FAILURE);
-        goto err;
-    }
-    /* Copy the pointers */
-    p_hwcrhk_Init = p1;
-    p_hwcrhk_Finish = p2;
-    p_hwcrhk_ModExp = p3;
-#  ifndef OPENSSL_NO_RSA
-    p_hwcrhk_RSA = p4;
-    p_hwcrhk_RSALoadKey = p5;
-    p_hwcrhk_RSAGetPublicKey = p6;
-    p_hwcrhk_RSAUnloadKey = p7;
-#  endif
-    p_hwcrhk_RandomBytes = p8;
-    p_hwcrhk_ModExpCRT = p9;
-
-    /*
-     * Check if the application decided to support dynamic locks, and if it
-     * does, use them.
-     */
-    if (disable_mutex_callbacks == 0) {
-        hwcrhk_globals.mutex_init = hwcrhk_mutex_init;
-        hwcrhk_globals.mutex_acquire = hwcrhk_mutex_lock;
-        hwcrhk_globals.mutex_release = hwcrhk_mutex_unlock;
-        hwcrhk_globals.mutex_destroy = hwcrhk_mutex_destroy;
-    }
-
-    /*
-     * Try and get a context - if not, we may have a DSO but no accelerator!
-     */
-    if (!get_context(&hwcrhk_context, &password_context)) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_INIT, HWCRHK_R_UNIT_FAILURE);
-        goto err;
-    }
-    /* Everything's fine. */
-#  ifndef OPENSSL_NO_RSA
-    if (hndidx_rsa == -1)
-        hndidx_rsa = RSA_get_ex_new_index(0,
-                                          "nFast HWCryptoHook RSA key handle",
-                                          NULL, NULL, NULL);
-#  endif
-    return 1;
- err:
-    DSO_free(hwcrhk_dso);
-    hwcrhk_dso = NULL;
-    p_hwcrhk_Init = NULL;
-    p_hwcrhk_Finish = NULL;
-    p_hwcrhk_ModExp = NULL;
-#  ifndef OPENSSL_NO_RSA
-    p_hwcrhk_RSA = NULL;
-    p_hwcrhk_RSALoadKey = NULL;
-    p_hwcrhk_RSAGetPublicKey = NULL;
-    p_hwcrhk_RSAUnloadKey = NULL;
-#  endif
-    p_hwcrhk_ModExpCRT = NULL;
-    p_hwcrhk_RandomBytes = NULL;
-    return 0;
-}
-
-static int hwcrhk_finish(ENGINE *e)
-{
-    int to_return = 1;
-    free_HWCRHK_LIBNAME();
-    if (hwcrhk_dso == NULL) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_FINISH, HWCRHK_R_NOT_LOADED);
-        to_return = 0;
-        goto err;
-    }
-    release_context(hwcrhk_context);
-    if (!DSO_free(hwcrhk_dso)) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_FINISH, HWCRHK_R_DSO_FAILURE);
-        to_return = 0;
-        goto err;
-    }
- err:
-    BIO_free(logstream);
-    hwcrhk_dso = NULL;
-    p_hwcrhk_Init = NULL;
-    p_hwcrhk_Finish = NULL;
-    p_hwcrhk_ModExp = NULL;
-#  ifndef OPENSSL_NO_RSA
-    p_hwcrhk_RSA = NULL;
-    p_hwcrhk_RSALoadKey = NULL;
-    p_hwcrhk_RSAGetPublicKey = NULL;
-    p_hwcrhk_RSAUnloadKey = NULL;
-#  endif
-    p_hwcrhk_ModExpCRT = NULL;
-    p_hwcrhk_RandomBytes = NULL;
-    return to_return;
-}
-
-static int hwcrhk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
-{
-    int to_return = 1;
-
-    switch (cmd) {
-    case HWCRHK_CMD_SO_PATH:
-        if (hwcrhk_dso) {
-            HWCRHKerr(HWCRHK_F_HWCRHK_CTRL, HWCRHK_R_ALREADY_LOADED);
-            return 0;
-        }
-        if (p == NULL) {
-            HWCRHKerr(HWCRHK_F_HWCRHK_CTRL, ERR_R_PASSED_NULL_PARAMETER);
-            return 0;
-        }
-        return set_HWCRHK_LIBNAME((const char *)p);
-    case ENGINE_CTRL_SET_LOGSTREAM:
-        {
-            BIO *bio = (BIO *)p;
-
-            CRYPTO_THREAD_write_lock(chil_lock);
-            BIO_free(logstream);
-            logstream = NULL;
-            if (BIO_up_ref(bio))
-                logstream = bio;
-            else
-                HWCRHKerr(HWCRHK_F_HWCRHK_CTRL, HWCRHK_R_BIO_WAS_FREED);
-        }
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-    case ENGINE_CTRL_SET_PASSWORD_CALLBACK:
-        CRYPTO_THREAD_write_lock(chil_lock);
-        password_context.password_callback = (pem_password_cb *)f;
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-    case ENGINE_CTRL_SET_USER_INTERFACE:
-    case HWCRHK_CMD_SET_USER_INTERFACE:
-        CRYPTO_THREAD_write_lock(chil_lock);
-        password_context.ui_method = (UI_METHOD *)p;
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-    case ENGINE_CTRL_SET_CALLBACK_DATA:
-    case HWCRHK_CMD_SET_CALLBACK_DATA:
-        CRYPTO_THREAD_write_lock(chil_lock);
-        password_context.callback_data = p;
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-        /*
-         * this enables or disables the "SimpleForkCheck" flag used in the
-         * initialisation structure.
-         */
-    case ENGINE_CTRL_CHIL_SET_FORKCHECK:
-    case HWCRHK_CMD_FORK_CHECK:
-        CRYPTO_THREAD_write_lock(chil_lock);
-        if (i)
-            hwcrhk_globals.flags |= HWCryptoHook_InitFlags_SimpleForkCheck;
-        else
-            hwcrhk_globals.flags &= ~HWCryptoHook_InitFlags_SimpleForkCheck;
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-        /*
-         * This will prevent the initialisation function from "installing"
-         * the mutex-handling callbacks, even if they are available from
-         * within the library (or were provided to the library from the
-         * calling application). This is to remove any baggage for
-         * applications not using multithreading.
-         */
-    case ENGINE_CTRL_CHIL_NO_LOCKING:
-        CRYPTO_THREAD_write_lock(chil_lock);
-        disable_mutex_callbacks = 1;
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-    case HWCRHK_CMD_THREAD_LOCKING:
-        CRYPTO_THREAD_write_lock(chil_lock);
-        disable_mutex_callbacks = ((i == 0) ? 0 : 1);
-        CRYPTO_THREAD_unlock(chil_lock);
-        break;
-
-        /* The command isn't understood by this engine */
-    default:
-        HWCRHKerr(HWCRHK_F_HWCRHK_CTRL,
-                  HWCRHK_R_CTRL_COMMAND_NOT_IMPLEMENTED);
-        to_return = 0;
-        break;
-    }
-
-    return to_return;
-}
-
-static EVP_PKEY *hwcrhk_load_privkey(ENGINE *eng, const char *key_id,
-                                     UI_METHOD *ui_method,
-                                     void *callback_data)
-{
-#  ifndef OPENSSL_NO_RSA
-    RSA *rtmp = NULL;
-#  endif
-    EVP_PKEY *res = NULL;
-#  ifndef OPENSSL_NO_RSA
-    HWCryptoHook_MPI e, n;
-    HWCryptoHook_RSAKeyHandle *hptr;
-#  endif
-#  if !defined(OPENSSL_NO_RSA)
-    char tempbuf[1024];
-    HWCryptoHook_ErrMsgBuf rmsg;
-    HWCryptoHook_PassphraseContext ppctx;
-#  endif
-
-#  if !defined(OPENSSL_NO_RSA)
-    rmsg.buf = tempbuf;
-    rmsg.size = sizeof(tempbuf);
-#  endif
-
-    if (!hwcrhk_context) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, HWCRHK_R_NOT_INITIALISED);
-        goto err;
-    }
-#  ifndef OPENSSL_NO_RSA
-    hptr = OPENSSL_malloc(sizeof(*hptr));
-    if (hptr == NULL) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, ERR_R_MALLOC_FAILURE);
-        goto err;
-    }
-    ppctx.ui_method = ui_method;
-    ppctx.callback_data = callback_data;
-    if (p_hwcrhk_RSALoadKey(hwcrhk_context, key_id, hptr, &rmsg, &ppctx)) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, HWCRHK_R_CHIL_ERROR);
-        ERR_add_error_data(1, rmsg.buf);
-        goto err;
-    }
-    if (!*hptr) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, HWCRHK_R_NO_KEY);
-        goto err;
-    }
-#  endif
-#  ifndef OPENSSL_NO_RSA
-    rtmp = RSA_new_method(eng);
-    RSA_set_ex_data(rtmp, hndidx_rsa, (char *)hptr);
-    rtmp->e = BN_new();
-    rtmp->n = BN_new();
-    rtmp->flags |= RSA_FLAG_EXT_PKEY;
-    MPI2BN(rtmp->e, e);
-    MPI2BN(rtmp->n, n);
-    if (p_hwcrhk_RSAGetPublicKey(*hptr, &n, &e, &rmsg)
-        != HWCRYPTOHOOK_ERROR_MPISIZE) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, HWCRHK_R_CHIL_ERROR);
-        ERR_add_error_data(1, rmsg.buf);
-        goto err;
-    }
-
-    bn_expand2(rtmp->e, e.size / sizeof(BN_ULONG));
-    bn_expand2(rtmp->n, n.size / sizeof(BN_ULONG));
-    MPI2BN(rtmp->e, e);
-    MPI2BN(rtmp->n, n);
-
-    if (p_hwcrhk_RSAGetPublicKey(*hptr, &n, &e, &rmsg)) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, HWCRHK_R_CHIL_ERROR);
-        ERR_add_error_data(1, rmsg.buf);
-        goto err;
-    }
-    rtmp->e->top = e.size / sizeof(BN_ULONG);
-    bn_fix_top(rtmp->e);
-    rtmp->n->top = n.size / sizeof(BN_ULONG);
-    bn_fix_top(rtmp->n);
-
-    res = EVP_PKEY_new();
-    if (res == NULL) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY, HWCRHK_R_CHIL_ERROR);
-        goto err;
-    }
-    EVP_PKEY_assign_RSA(res, rtmp);
-#  endif
-
-    if (res == NULL)
-        HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PRIVKEY,
-                  HWCRHK_R_PRIVATE_KEY_ALGORITHMS_DISABLED);
-
-    return res;
- err:
-#  ifndef OPENSSL_NO_RSA
-    RSA_free(rtmp);
-#  endif
-    return NULL;
-}
-
-static EVP_PKEY *hwcrhk_load_pubkey(ENGINE *eng, const char *key_id,
-                                    UI_METHOD *ui_method, void *callback_data)
-{
-    EVP_PKEY *res = NULL;
-
-#  ifndef OPENSSL_NO_RSA
-    res = hwcrhk_load_privkey(eng, key_id, ui_method, callback_data);
-#  endif
-
-    if (res)
-        switch (res->type) {
-#  ifndef OPENSSL_NO_RSA
-        case EVP_PKEY_RSA:
-            {
-                RSA *rsa = NULL;
-
-                CRYPTO_THREAD_write_lock(chil_lock);
-                rsa = res->pkey.rsa;
-                res->pkey.rsa = RSA_new();
-                res->pkey.rsa->n = rsa->n;
-                res->pkey.rsa->e = rsa->e;
-                rsa->n = NULL;
-                rsa->e = NULL;
-                CRYPTO_THREAD_unlock(chil_lock);
-                RSA_free(rsa);
-            }
-            break;
-#  endif
-        default:
-            HWCRHKerr(HWCRHK_F_HWCRHK_LOAD_PUBKEY,
-                      HWCRHK_R_CTRL_COMMAND_NOT_IMPLEMENTED);
-            goto err;
-        }
-
-    return res;
- err:
-    EVP_PKEY_free(res);
-    return NULL;
-}
-
-/* A little mod_exp */
-static int hwcrhk_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
-                          const BIGNUM *m, BN_CTX *ctx)
-{
-    char tempbuf[1024];
-    HWCryptoHook_ErrMsgBuf rmsg;
-    /*
-     * Since HWCryptoHook_MPI is pretty compatible with BIGNUM's, we use them
-     * directly, plus a little macro magic.  We only thing we need to make
-     * sure of is that enough space is allocated.
-     */
-    HWCryptoHook_MPI m_a, m_p, m_n, m_r;
-    int to_return, ret;
-
-    to_return = 0;              /* expect failure */
-    rmsg.buf = tempbuf;
-    rmsg.size = sizeof(tempbuf);
-
-    if (!hwcrhk_context) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_MOD_EXP, HWCRHK_R_NOT_INITIALISED);
-        goto err;
-    }
-    /* Prepare the params */
-    bn_expand2(r, m->top);      /* Check for error !! */
-    BN2MPI(m_a, a);
-    BN2MPI(m_p, p);
-    BN2MPI(m_n, m);
-    MPI2BN(r, m_r);
-
-    /* Perform the operation */
-    ret = p_hwcrhk_ModExp(hwcrhk_context, m_a, m_p, m_n, &m_r, &rmsg);
-
-    /* Convert the response */
-    r->top = m_r.size / sizeof(BN_ULONG);
-    bn_fix_top(r);
-
-    if (ret < 0) {
-        /*
-         * FIXME: When this error is returned, HWCryptoHook is telling us
-         * that falling back to software computation might be a good thing.
-         */
-        if (ret == HWCRYPTOHOOK_ERROR_FALLBACK) {
-            HWCRHKerr(HWCRHK_F_HWCRHK_MOD_EXP, HWCRHK_R_REQUEST_FALLBACK);
-        } else {
-            HWCRHKerr(HWCRHK_F_HWCRHK_MOD_EXP, HWCRHK_R_REQUEST_FAILED);
-        }
-        ERR_add_error_data(1, rmsg.buf);
-        goto err;
-    }
-
-    to_return = 1;
- err:
-    return to_return;
-}
-
-#  ifndef OPENSSL_NO_RSA
-static int hwcrhk_rsa_mod_exp(BIGNUM *r, const BIGNUM *I, RSA *rsa,
-                              BN_CTX *ctx)
-{
-    char tempbuf[1024];
-    HWCryptoHook_ErrMsgBuf rmsg;
-    HWCryptoHook_RSAKeyHandle *hptr;
-    int to_return = 0, ret;
-
-    rmsg.buf = tempbuf;
-    rmsg.size = sizeof(tempbuf);
-
-    if (!hwcrhk_context) {
-        HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP, HWCRHK_R_NOT_INITIALISED);
-        goto err;
-    }
-
-    /*
-     * This provides support for nForce keys.  Since that's opaque data all
-     * we do is provide a handle to the proper key and let HWCryptoHook take
-     * care of the rest.
-     */
-    if ((hptr =
-         (HWCryptoHook_RSAKeyHandle *) RSA_get_ex_data(rsa, hndidx_rsa))
-        != NULL) {
-        HWCryptoHook_MPI m_a, m_r;
-
-        if (!rsa->n) {
-            HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP,
-                      HWCRHK_R_MISSING_KEY_COMPONENTS);
-            goto err;
-        }
-
-        /* Prepare the params */
-        bn_expand2(r, rsa->n->top); /* Check for error !! */
-        BN2MPI(m_a, I);
-        MPI2BN(r, m_r);
-
-        /* Perform the operation */
-        ret = p_hwcrhk_RSA(m_a, *hptr, &m_r, &rmsg);
-
-        /* Convert the response */
-        r->top = m_r.size / sizeof(BN_ULONG);
-        bn_fix_top(r);
-
-        if (ret < 0) {
-            /*
-             * FIXME: When this error is returned, HWCryptoHook is telling us
-             * that falling back to software computation might be a good
-             * thing.
-             */
-            if (ret == HWCRYPTOHOOK_ERROR_FALLBACK) {
-                HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP,
-                          HWCRHK_R_REQUEST_FALLBACK);
-            } else {
-                HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP,
-                          HWCRHK_R_REQUEST_FAILED);
-            }
-            ERR_add_error_data(1, rmsg.buf);
-            goto err;
-        }
-    } else {
-        HWCryptoHook_MPI m_a, m_p, m_q, m_dmp1, m_dmq1, m_iqmp, m_r;
-
-        if (!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp) {
-            HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP,
-                      HWCRHK_R_MISSING_KEY_COMPONENTS);
-            goto err;
-        }
-
-        /* Prepare the params */
-        bn_expand2(r, rsa->n->top); /* Check for error !! */
-        BN2MPI(m_a, I);
-        BN2MPI(m_p, rsa->p);
-        BN2MPI(m_q, rsa->q);
-        BN2MPI(m_dmp1, rsa->dmp1);
-        BN2MPI(m_dmq1, rsa->dmq1);
-        BN2MPI(m_iqmp, rsa->iqmp);
-        MPI2BN(r, m_r);
-
-        /* Perform the operation */
-        ret = p_hwcrhk_ModExpCRT(hwcrhk_context, m_a, m_p, m_q,
-                                 m_dmp1, m_dmq1, m_iqmp, &m_r, &rmsg);
-
-        /* Convert the response */
-        r->top = m_r.size / sizeof(BN_ULONG);
-        bn_fix_top(r);
-
-        if (ret < 0) {
-            /*
-             * FIXME: When this error is returned, HWCryptoHook is telling us
-             * that falling back to software computation might be a good
-             * thing.
-             */
-            if (ret == HWCRYPTOHOOK_ERROR_FALLBACK) {
-                HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP,
-                          HWCRHK_R_REQUEST_FALLBACK);
-            } else {
-                HWCRHKerr(HWCRHK_F_HWCRHK_RSA_MOD_EXP,
-                          HWCRHK_R_REQUEST_FAILED);
-            }
-            ERR_add_error_data(1, rmsg.buf);
-            goto err;
-        }
-    }
-    /*
-     * If we're here, we must be here with some semblance of success :-)
-     */
-    to_return = 1;
- err:
-    return to_return;
-}
-#  endif
-
-#  ifndef OPENSSL_NO_RSA
-/* This function is aliased to mod_exp (with the mont stuff dropped). */
-static int hwcrhk_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
-                               const BIGNUM *m, BN_CTX *ctx,
-                               BN_MONT_CTX *m_ctx)