OpenSSL 0.9.7 stable 2002 05 08 merge

1 files changed, 1101 insertions, 0 deletions

diff --git a/src/lib/libcrypto/engine/hw_aep.c b/src/lib/libcrypto/engine/hw_aep.c
new file mode 100644
index 0000000000..cf4507cff1
--- /dev/null
+++ b/src/lib/libcrypto/engine/hw_aep.c
@@ -0,0 +1,1101 @@
+/* crypto/engine/hw_aep.c */
+/*
+ */
+/* ====================================================================
+ * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include <openssl/bn.h>
+#include <string.h>
+
+#include <openssl/e_os2.h>
+#ifndef OPENSSL_SYS_MSDOS
+#include <sys/types.h>
+#include <unistd.h>
+#else
+#include <process.h>
+typedef int pid_t;
+#endif
+
+#include <openssl/crypto.h>
+#include <openssl/dso.h>
+#include <openssl/engine.h>
+
+#ifndef OPENSSL_NO_HW
+#ifndef OPENSSL_NO_HW_AEP
+#ifdef FLAT_INC
+#include "aep.h"
+#else
+#include "vendor_defns/aep.h"
+#endif
+
+#define AEP_LIB_NAME "aep engine"
+#define FAIL_TO_SW 0x10101010
+
+#include "hw_aep_err.c"
+
+static int aep_init(ENGINE *e);
+static int aep_finish(ENGINE *e);
+static int aep_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)());
+static int aep_destroy(ENGINE *e);
+
+static AEP_RV aep_get_connection(AEP_CONNECTION_HNDL_PTR hConnection);
+static AEP_RV aep_return_connection(AEP_CONNECTION_HNDL hConnection);
+static AEP_RV aep_close_connection(AEP_CONNECTION_HNDL hConnection);
+static AEP_RV aep_close_all_connections(int use_engine_lock, int *in_use);
+
+/* BIGNUM stuff */
+static int aep_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+        const BIGNUM *m, BN_CTX *ctx);
+
+static AEP_RV aep_mod_exp_crt(BIGNUM *r,const  BIGNUM *a, const BIGNUM *p,
+        const BIGNUM *q, const BIGNUM *dmp1,const BIGNUM *dmq1,
+        const BIGNUM *iqmp, BN_CTX *ctx);
+
+/* RSA stuff */
+#ifndef OPENSSL_NO_RSA
+static int aep_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa);
+#endif
+
+/* This function is aliased to mod_exp (with the mont stuff dropped). */
+static int aep_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+        const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+
+/* DSA stuff */
+#ifndef OPENSSL_NO_DSA
+static int aep_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
+        BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
+        BN_CTX *ctx, BN_MONT_CTX *in_mont);
+
+static int aep_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
+        const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
+        BN_MONT_CTX *m_ctx);
+#endif
+
+/* DH stuff */
+/* This function is aliased to mod_exp (with the DH and mont dropped). */
+#ifndef OPENSSL_NO_DH
+static int aep_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   */
+#ifdef AEPRAND
+static int aep_rand(unsigned char *buf, int num);
+static int aep_rand_status(void);
+#endif
+
+/* Bignum conversion stuff */
+static AEP_RV GetBigNumSize(AEP_VOID_PTR ArbBigNum, AEP_U32* BigNumSize);
+static AEP_RV MakeAEPBigNum(AEP_VOID_PTR ArbBigNum, AEP_U32 BigNumSize,
+        unsigned char* AEP_BigNum);
+static AEP_RV ConvertAEPBigNum(void* ArbBigNum, AEP_U32 BigNumSize,
+        unsigned char* AEP_BigNum);
+
+/* The definitions for control commands specific to this engine */
+#define AEP_CMD_SO_PATH         ENGINE_CMD_BASE
+static const ENGINE_CMD_DEFN aep_cmd_defns[] =
+        {
+        { AEP_CMD_SO_PATH,
+          "SO_PATH",
+          "Specifies the path to the 'aep' shared library",
+          ENGINE_CMD_FLAG_STRING
+        },
+        {0, NULL, NULL, 0}
+        };
+
+#ifndef OPENSSL_NO_RSA
+/* Our internal RSA_METHOD that we provide pointers to */
+static RSA_METHOD aep_rsa =
+        {
+        "Aep RSA method",
+        NULL,                /*rsa_pub_encrypt*/
+        NULL,                /*rsa_pub_decrypt*/
+        NULL,                /*rsa_priv_encrypt*/
+        NULL,                /*rsa_priv_encrypt*/
+        aep_rsa_mod_exp,     /*rsa_mod_exp*/
+        aep_mod_exp_mont,    /*bn_mod_exp*/
+        NULL,                /*init*/
+        NULL,                /*finish*/
+        0,                   /*flags*/
+        NULL,                /*app_data*/
+        NULL,                /*rsa_sign*/
+        NULL                 /*rsa_verify*/
+        };
+#endif
+
+#ifndef OPENSSL_NO_DSA
+/* Our internal DSA_METHOD that we provide pointers to */
+static DSA_METHOD aep_dsa =
+        {
+        "Aep DSA method",
+        NULL,                /* dsa_do_sign */
+        NULL,                /* dsa_sign_setup */
+        NULL,                /* dsa_do_verify */
+        aep_dsa_mod_exp,     /* dsa_mod_exp */
+        aep_mod_exp_dsa,     /* bn_mod_exp */
+        NULL,                /* init */
+        NULL,                /* finish */
+        0,                   /* flags */
+        NULL                 /* app_data */
+        };
+#endif
+
+#ifndef OPENSSL_NO_DH
+/* Our internal DH_METHOD that we provide pointers to */
+static DH_METHOD aep_dh =
+        {
+        "Aep DH method",
+        NULL,
+        NULL,
+        aep_mod_exp_dh,
+        NULL,
+        NULL,
+        0,
+        NULL
+        };
+#endif
+
+#ifdef AEPRAND
+/* our internal RAND_method that we provide pointers to  */
+static RAND_METHOD aep_random =
+        {
+        /*"AEP RAND method", */
+        NULL,
+        aep_rand,
+        NULL,
+        NULL,
+        aep_rand,
+        aep_rand_status,
+        };
+#endif
+
+/*Define an array of structures to hold connections*/
+static AEP_CONNECTION_ENTRY aep_app_conn_table[MAX_PROCESS_CONNECTIONS];
+
+/*Used to determine if this is a new process*/
+static pid_t    recorded_pid = 0;
+
+#ifdef AEPRAND
+static AEP_U8   rand_block[RAND_BLK_SIZE];
+static AEP_U32  rand_block_bytes = 0;
+#endif
+
+/* Constants used when creating the ENGINE */
+static const char *engine_aep_id = "aep";
+static const char *engine_aep_name = "Aep hardware engine support";
+
+static int max_key_len = 2176;
+
+
+/* This internal function is used by ENGINE_aep() and possibly by the
+ * "dynamic" ENGINE support too */
+static int bind_aep(ENGINE *e)
+        {
+#ifndef OPENSSL_NO_RSA
+        const RSA_METHOD  *meth1;
+#endif
+#ifndef OPENSSL_NO_DSA
+        const DSA_METHOD  *meth2;
+#endif
+#ifndef OPENSSL_NO_DH
+        const DH_METHOD   *meth3;
+#endif
+
+        if(!ENGINE_set_id(e, engine_aep_id) ||
+                !ENGINE_set_name(e, engine_aep_name) ||
+#ifndef OPENSSL_NO_RSA
+                !ENGINE_set_RSA(e, &aep_rsa) ||
+#endif
+#ifndef OPENSSL_NO_DSA
+                !ENGINE_set_DSA(e, &aep_dsa) ||
+#endif
+#ifndef OPENSSL_NO_DH
+                !ENGINE_set_DH(e, &aep_dh) ||
+#endif
+#ifdef AEPRAND
+                !ENGINE_set_RAND(e, &aep_random) ||
+#endif
+                !ENGINE_set_init_function(e, aep_init) ||
+                !ENGINE_set_destroy_function(e, aep_destroy) ||
+                !ENGINE_set_finish_function(e, aep_finish) ||
+                !ENGINE_set_ctrl_function(e, aep_ctrl) ||
+                !ENGINE_set_cmd_defns(e, aep_cmd_defns))
+                return 0;
+
+#ifndef OPENSSL_NO_RSA
+        /* We know that the "PKCS1_SSLeay()" functions hook properly
+         * to the aep-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_SSLeay();
+        aep_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
+        aep_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
+        aep_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
+        aep_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
+#endif
+
+
+#ifndef OPENSSL_NO_DSA
+        /* Use the DSA_OpenSSL() method and just hook the mod_exp-ish
+         * bits. */
+        meth2 = DSA_OpenSSL();
+        aep_dsa.dsa_do_sign    = meth2->dsa_do_sign;
+        aep_dsa.dsa_sign_setup = meth2->dsa_sign_setup;
+        aep_dsa.dsa_do_verify  = meth2->dsa_do_verify;
+
+        aep_dsa = *DSA_get_default_method(); 
+        aep_dsa.dsa_mod_exp = aep_dsa_mod_exp; 
+        aep_dsa.bn_mod_exp = aep_mod_exp_dsa;
+#endif
+
+#ifndef OPENSSL_NO_DH
+        /* Much the same for Diffie-Hellman */
+        meth3 = DH_OpenSSL();
+        aep_dh.generate_key = meth3->generate_key;
+        aep_dh.compute_key  = meth3->compute_key;
+        aep_dh.bn_mod_exp   = meth3->bn_mod_exp;
+#endif
+
+        /* Ensure the aep error handling is set up */
+        ERR_load_AEPHK_strings();
+
+        return 1;
+}
+
+#ifdef ENGINE_DYNAMIC_SUPPORT
+static int bind_helper(ENGINE *e, const char *id)
+        {
+        if(id && (strcmp(id, engine_aep_id) != 0))
+                return 0;
+        if(!bind_aep(e))
+                return 0;
+        return 1;
+        }       
+IMPLEMENT_DYNAMIC_CHECK_FN()
+IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
+#else
+static ENGINE *engine_aep(void)
+        {
+        ENGINE *ret = ENGINE_new();
+        if(!ret)
+                return NULL;
+        if(!bind_aep(ret))
+                {
+                ENGINE_free(ret);
+                return NULL;
+                }
+        return ret;
+        }
+
+void ENGINE_load_aep(void)
+        {
+        /* Copied from eng_[openssl|dyn].c */
+        ENGINE *toadd = engine_aep();
+        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 Aep 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 *aep_dso = NULL;
+
+/* These are the static string constants for the DSO file name and the function
+ * symbol names to bind to. 
+*/
+static const char *AEP_LIBNAME = "aep";
+
+static const char *AEP_F1    = "AEP_ModExp";
+static const char *AEP_F2    = "AEP_ModExpCrt";
+#ifdef AEPRAND
+static const char *AEP_F3    = "AEP_GenRandom";
+#endif
+static const char *AEP_F4    = "AEP_Finalize";
+static const char *AEP_F5    = "AEP_Initialize";
+static const char *AEP_F6    = "AEP_OpenConnection";
+static const char *AEP_F7    = "AEP_SetBNCallBacks";
+static const char *AEP_F8    = "AEP_CloseConnection";
+
+/* These are the function pointers that are (un)set when the library has
+ * successfully (un)loaded. */
+static t_AEP_OpenConnection    *p_AEP_OpenConnection  = NULL;
+static t_AEP_CloseConnection   *p_AEP_CloseConnection = NULL;
+static t_AEP_ModExp            *p_AEP_ModExp          = NULL;
+static t_AEP_ModExpCrt         *p_AEP_ModExpCrt       = NULL;
+#ifdef AEPRAND
+static t_AEP_GenRandom         *p_AEP_GenRandom       = NULL;
+#endif
+static t_AEP_Initialize        *p_AEP_Initialize      = NULL;
+static t_AEP_Finalize          *p_AEP_Finalize        = NULL;
+static t_AEP_SetBNCallBacks    *p_AEP_SetBNCallBacks  = NULL;
+
+/* (de)initialisation functions. */
+static int aep_init(ENGINE *e)
+        {
+        t_AEP_ModExp          *p1;
+        t_AEP_ModExpCrt       *p2;
+#ifdef AEPRAND
+        t_AEP_GenRandom       *p3;
+#endif
+        t_AEP_Finalize        *p4;
+        t_AEP_Initialize      *p5;
+        t_AEP_OpenConnection  *p6;
+        t_AEP_SetBNCallBacks  *p7;
+        t_AEP_CloseConnection *p8;
+
+        int to_return = 0;
+ 
+        if(aep_dso != NULL)
+                {
+                AEPHKerr(AEPHK_F_AEP_INIT,AEPHK_R_ALREADY_LOADED);
+                goto err;
+                }
+        /* Attempt to load libaep.so. */
+
+        aep_dso = DSO_load(NULL, AEP_LIBNAME, NULL, 0);
+  
+        if(aep_dso == NULL)
+                {
+                AEPHKerr(AEPHK_F_AEP_INIT,AEPHK_R_NOT_LOADED);
+                goto err;
+                }
+
+        if(     !(p1 = (t_AEP_ModExp *)     DSO_bind_func( aep_dso,AEP_F1))  ||
+                !(p2 = (t_AEP_ModExpCrt*)   DSO_bind_func( aep_dso,AEP_F2))  ||
+#ifdef AEPRAND
+                !(p3 = (t_AEP_GenRandom*)   DSO_bind_func( aep_dso,AEP_F3))  ||
+#endif
+                !(p4 = (t_AEP_Finalize*)    DSO_bind_func( aep_dso,AEP_F4))  ||
+                !(p5 = (t_AEP_Initialize*)  DSO_bind_func( aep_dso,AEP_F5))  ||
+                !(p6 = (t_AEP_OpenConnection*) DSO_bind_func( aep_dso,AEP_F6))  ||
+                !(p7 = (t_AEP_SetBNCallBacks*) DSO_bind_func( aep_dso,AEP_F7))  ||
+                !(p8 = (t_AEP_CloseConnection*) DSO_bind_func( aep_dso,AEP_F8)))
+                {
+                AEPHKerr(AEPHK_F_AEP_INIT,AEPHK_R_NOT_LOADED);
+                goto err;
+                }
+
+        /* Copy the pointers */
+  
+        p_AEP_ModExp           = p1;
+        p_AEP_ModExpCrt        = p2;
+#ifdef AEPRAND
+        p_AEP_GenRandom        = p3;
+#endif
+        p_AEP_Finalize         = p4;
+        p_AEP_Initialize       = p5;
+        p_AEP_OpenConnection   = p6;
+        p_AEP_SetBNCallBacks   = p7;
+        p_AEP_CloseConnection  = p8;
+ 
+        to_return = 1;
+ 
+        return to_return;
+
+ err: 
+
+        if(aep_dso)
+                DSO_free(aep_dso);
+                
+        p_AEP_OpenConnection    = NULL;
+        p_AEP_ModExp            = NULL;
+        p_AEP_ModExpCrt         = NULL;
+#ifdef AEPRAND
+        p_AEP_GenRandom         = NULL;
+#endif
+        p_AEP_Initialize        = NULL;
+        p_AEP_Finalize          = NULL;
+        p_AEP_SetBNCallBacks    = NULL;
+        p_AEP_CloseConnection   = NULL;
+
+        return to_return;
+        }
+
+/* Destructor (complements the "ENGINE_aep()" constructor) */
+static int aep_destroy(ENGINE *e)
+        {
+        ERR_unload_AEPHK_strings();
+        return 1;
+        }
+
+static int aep_finish(ENGINE *e)
+        {
+        int to_return = 0, in_use;
+        AEP_RV rv;
+
+        if(aep_dso == NULL)
+                {
+                AEPHKerr(AEPHK_F_AEP_FINISH,AEPHK_R_NOT_LOADED);
+                goto err;
+                }
+
+        rv = aep_close_all_connections(0, &in_use);
+        if (rv != AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_FINISH,AEPHK_R_CLOSE_HANDLES_FAILED);
+                goto err;
+                }
+        if (in_use)
+                {
+                AEPHKerr(AEPHK_F_AEP_FINISH,AEPHK_R_CONNECTIONS_IN_USE);
+                goto err;
+                }
+
+        rv = p_AEP_Finalize();
+        if (rv != AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_FINISH,AEPHK_R_FINALIZE_FAILED);
+                goto err;
+                }
+
+        if(!DSO_free(aep_dso))
+                {
+                AEPHKerr(AEPHK_F_AEP_FINISH,AEPHK_R_UNIT_FAILURE);
+                goto err;
+                }
+
+        aep_dso = NULL;
+        p_AEP_CloseConnection   = NULL;
+        p_AEP_OpenConnection    = NULL;
+        p_AEP_ModExp            = NULL;
+        p_AEP_ModExpCrt         = NULL;
+#ifdef AEPRAND
+        p_AEP_GenRandom         = NULL;
+#endif
+        p_AEP_Initialize        = NULL;
+        p_AEP_Finalize          = NULL;
+        p_AEP_SetBNCallBacks    = NULL;
+
+        to_return = 1;
+ err:
+        return to_return;
+        }
+
+static int aep_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
+        {
+        int initialised = ((aep_dso == NULL) ? 0 : 1);
+        switch(cmd)
+                {
+        case AEP_CMD_SO_PATH:
+                if(p == NULL)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_CTRL,
+                                ERR_R_PASSED_NULL_PARAMETER);
+                        return 0;
+                        }
+                if(initialised)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_CTRL,
+                                AEPHK_R_ALREADY_LOADED);
+                        return 0;
+                        }
+                AEP_LIBNAME = (const char *)p;
+                return 1;
+        default:
+                break;
+                }
+        AEPHKerr(AEPHK_F_AEP_CTRL,AEPHK_R_CTRL_COMMAND_NOT_IMPLEMENTED);
+        return 0;
+        }
+
+static int aep_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+        const BIGNUM *m, BN_CTX *ctx)
+        {
+        int to_return = 0;
+        int     r_len = 0;
+        AEP_CONNECTION_HNDL hConnection;
+        AEP_RV rv;
+        
+        r_len = BN_num_bits(m);
+
+        /* Perform in software if modulus is too large for hardware. */
+
+        if (r_len > max_key_len){
+                AEPHKerr(AEPHK_F_AEP_MOD_EXP, AEPHK_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
+                return BN_mod_exp(r, a, p, m, ctx);
+        } 
+
+        /*Grab a connection from the pool*/
+        rv = aep_get_connection(&hConnection);
+        if (rv != AEP_R_OK)
+                {     
+                AEPHKerr(AEPHK_F_AEP_MOD_EXP,AEPHK_R_GET_HANDLE_FAILED);
+                return BN_mod_exp(r, a, p, m, ctx);
+                }
+
+        /*To the card with the mod exp*/
+        rv = p_AEP_ModExp(hConnection,(void*)a, (void*)p,(void*)m, (void*)r,NULL);
+
+        if (rv !=  AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_MOD_EXP,AEPHK_R_MOD_EXP_FAILED);
+                rv = aep_close_connection(hConnection);
+                return BN_mod_exp(r, a, p, m, ctx);
+                }
+
+        /*Return the connection to the pool*/
+        rv = aep_return_connection(hConnection);
+        if (rv != AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_RAND,AEPHK_R_RETURN_CONNECTION_FAILED); 
+                goto err;
+                }
+
+        to_return = 1;
+ err:
+        return to_return;
+        }
+        
+static AEP_RV aep_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+        const BIGNUM *q, const BIGNUM *dmp1,
+        const BIGNUM *dmq1,const BIGNUM *iqmp, BN_CTX *ctx)
+        {
+        AEP_RV rv = AEP_R_OK;
+        AEP_CONNECTION_HNDL hConnection;
+
+        /*Grab a connection from the pool*/
+        rv = aep_get_connection(&hConnection);
+        if (rv != AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_MOD_EXP_CRT,AEPHK_R_GET_HANDLE_FAILED);
+                return FAIL_TO_SW;
+                }
+
+        /*To the card with the mod exp*/
+        rv = p_AEP_ModExpCrt(hConnection,(void*)a, (void*)p, (void*)q, (void*)dmp1,(void*)dmq1,
+                (void*)iqmp,(void*)r,NULL);
+        if (rv != AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_MOD_EXP_CRT,AEPHK_R_MOD_EXP_CRT_FAILED);
+                rv = aep_close_connection(hConnection);
+                return FAIL_TO_SW;
+                }
+
+        /*Return the connection to the pool*/
+        rv = aep_return_connection(hConnection);
+        if (rv != AEP_R_OK)
+                {
+                AEPHKerr(AEPHK_F_AEP_RAND,AEPHK_R_RETURN_CONNECTION_FAILED); 
+                goto err;
+                }
+ 
+ err:
+        return rv;
+        }
+        
+
+#ifdef AEPRAND
+static int aep_rand(unsigned char *buf,int len )
+        {
+        AEP_RV rv = AEP_R_OK;
+        AEP_CONNECTION_HNDL hConnection;
+
+        CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+
+        /*Can the request be serviced with what's already in the buffer?*/
+        if (len <= rand_block_bytes)
+                {
+                memcpy(buf, &rand_block[RAND_BLK_SIZE - rand_block_bytes], len);
+                rand_block_bytes -= len;
+                CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+                }
+        else
+                /*If not the get another block of random bytes*/
+                {
+                CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+
+                rv = aep_get_connection(&hConnection);
+                if (rv !=  AEP_R_OK)
+                        { 
+                        AEPHKerr(AEPHK_F_AEP_RAND,AEPHK_R_GET_HANDLE_FAILED);             
+                        goto err_nounlock;
+                        }
+
+                if (len > RAND_BLK_SIZE)
+                        {
+                        rv = p_AEP_GenRandom(hConnection, len, 2, buf, NULL);
+                        if (rv !=  AEP_R_OK)
+                                {  
+                                AEPHKerr(AEPHK_F_AEP_RAND,AEPHK_R_GET_RANDOM_FAILED); 
+                                goto err_nounlock;
+                                }
+                        }
+                else
+                        {
+                        CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+
+                        rv = p_AEP_GenRandom(hConnection, RAND_BLK_SIZE, 2, &rand_block[0], NULL);
+                        if (rv !=  AEP_R_OK)
+                                {       
+                                AEPHKerr(AEPHK_F_AEP_RAND,AEPHK_R_GET_RANDOM_FAILED); 
+              
+                                goto err;
+                                }
+
+                        rand_block_bytes = RAND_BLK_SIZE;
+
+                        memcpy(buf, &rand_block[RAND_BLK_SIZE - rand_block_bytes], len);
+                        rand_block_bytes -= len;
+
+                        CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+                        }
+
+                rv = aep_return_connection(hConnection);
+                if (rv != AEP_R_OK)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_RAND,AEPHK_R_RETURN_CONNECTION_FAILED); 
+          
+                        goto err_nounlock;
+                        }
+                }
+  
+        return 1;
+ err:
+        CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ err_nounlock:
+        return 0;
+        }
+        
+static int aep_rand_status(void)
+{
+        return 1;
+}
+#endif
+
+#ifndef OPENSSL_NO_RSA
+static int aep_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
+        {
+        BN_CTX *ctx = NULL;
+        int to_return = 0;
+        AEP_RV rv = AEP_R_OK;
+
+        if ((ctx = BN_CTX_new()) == NULL)
+                goto err;
+
+        if (!aep_dso)
+                {
+                AEPHKerr(AEPHK_F_AEP_RSA_MOD_EXP,AEPHK_R_NOT_LOADED);
+                goto err;
+                }
+
+        /*See if we have all the necessary bits for a crt*/
+        if (rsa->q && rsa->dmp1 && rsa->dmq1 && rsa->iqmp)
+                {
+                rv =  aep_mod_exp_crt(r0,I,rsa->p,rsa->q, rsa->dmp1,rsa->dmq1,rsa->iqmp,ctx);
+
+                if (rv == FAIL_TO_SW){
+                        const RSA_METHOD *meth = RSA_PKCS1_SSLeay();
+                        to_return = (*meth->rsa_mod_exp)(r0, I, rsa);
+                        goto err;
+                }
+                else if (rv != AEP_R_OK)
+                        goto err;
+                }
+        else
+                {
+                if (!rsa->d || !rsa->n)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_RSA_MOD_EXP,AEPHK_R_MISSING_KEY_COMPONENTS);
+                        goto err;
+                        }
+ 
+                rv = aep_mod_exp(r0,I,rsa->d,rsa->n,ctx);
+                if  (rv != AEP_R_OK)
+                        goto err;
+        
+                }
+
+        to_return = 1;
+
+ err:
+        if(ctx)
+                BN_CTX_free(ctx);
+        return to_return;
+}
+#endif
+
+#ifndef OPENSSL_NO_DSA
+static int aep_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
+        BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
+        BN_CTX *ctx, BN_MONT_CTX *in_mont)
+        {
+        BIGNUM t;
+        int to_return = 0;
+        BN_init(&t);
+
+        /* let rr = a1 ^ p1 mod m */
+        if (!aep_mod_exp(rr,a1,p1,m,ctx)) goto end;
+        /* let t = a2 ^ p2 mod m */
+        if (!aep_mod_exp(&t,a2,p2,m,ctx)) goto end;
+        /* let rr = rr * t mod m */
+        if (!BN_mod_mul(rr,rr,&t,m,ctx)) goto end;
+        to_return = 1;
+ end: 
+        BN_free(&t);
+        return to_return;
+        }
+
+static int aep_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
+        const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
+        BN_MONT_CTX *m_ctx)
+        {  
+        return aep_mod_exp(r, a, p, m, ctx); 
+        }
+#endif
+
+/* This function is aliased to mod_exp (with the mont stuff dropped). */
+static int aep_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+        const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
+        {
+        return aep_mod_exp(r, a, p, m, ctx);
+        }
+
+#ifndef OPENSSL_NO_DH
+/* This function is aliased to mod_exp (with the dh and mont dropped). */
+static int aep_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)
+        {
+        return aep_mod_exp(r, a, p, m, ctx);
+        }
+#endif
+
+static AEP_RV aep_get_connection(AEP_CONNECTION_HNDL_PTR phConnection)
+        {
+        int count;
+        AEP_RV rv = AEP_R_OK;
+
+        /*Get the current process id*/
+        pid_t curr_pid;
+
+        CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+
+        curr_pid = getpid();
+
+        /*Check if this is the first time this is being called from the current
+          process*/
+        if (recorded_pid != curr_pid)
+                {
+                /*Remember our pid so we can check if we're in a new process*/
+                recorded_pid = curr_pid;
+
+                /*Call Finalize to make sure we have not inherited some data
+                  from a parent process*/
+                p_AEP_Finalize();
+     
+                /*Initialise the AEP API*/
+                rv = p_AEP_Initialize(NULL);
+
+                if (rv != AEP_R_OK)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_GET_CONNECTION,AEPHK_R_INIT_FAILURE);
+                        recorded_pid = 0;
+                        goto end;
+                        }
+
+                /*Set the AEP big num call back functions*/
+                rv = p_AEP_SetBNCallBacks(&GetBigNumSize, &MakeAEPBigNum,
+                        &ConvertAEPBigNum);
+
+                if (rv != AEP_R_OK)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_GET_CONNECTION,AEPHK_R_SETBNCALLBACK_FAILURE);
+                        recorded_pid = 0;
+                        goto end;
+                        }
+
+#ifdef AEPRAND
+                /*Reset the rand byte count*/
+                rand_block_bytes = 0;
+#endif
+
+                /*Init the structures*/
+                for (count = 0;count < MAX_PROCESS_CONNECTIONS;count ++)
+                        {
+                        aep_app_conn_table[count].conn_state = NotConnected;
+                        aep_app_conn_table[count].conn_hndl  = 0;
+                        }
+
+                /*Open a connection*/
+                rv = p_AEP_OpenConnection(phConnection);
+
+                if (rv != AEP_R_OK)
+                        {
+                        AEPHKerr(AEPHK_F_AEP_GET_CONNECTION,AEPHK_R_UNIT_FAILURE);
+                        recorded_pid = 0;
+                        goto end;
+                        }
+
+                aep_app_conn_table[0].conn_state = InUse;
+                aep_app_conn_table[0].conn_hndl = *phConnection;
+                goto end;
+                }
+        /*Check the existing connections to see if we can find a free one*/
+        for (count = 0;count < MAX_PROCESS_CONNECTIONS;count ++)
+                {
+                if (aep_app_conn_table[count].conn_state == Connected)
+                        {
+                        aep_app_conn_table[count].conn_state = InUse;
+                        *phConnection = aep_app_conn_table[count].conn_hndl;
+                        goto end;
+                        }
+                }
+        /*If no connections available, we're going to have to try
+          to open a new one*/
+        for (count = 0;count < MAX_PROCESS_CONNECTIONS;count ++)
+                {
+                if (aep_app_conn_table[count].conn_state == NotConnected)
+                        {
+                        /*Open a connection*/
+                        rv = p_AEP_OpenConnection(phConnection);
+
+                        if (rv != AEP_R_OK)
+                                {             
+                                AEPHKerr(AEPHK_F_AEP_GET_CONNECTION,AEPHK_R_UNIT_FAILURE);
+                                goto end;
+                                }
+
+                        aep_app_conn_table[count].conn_state = InUse;
+                        aep_app_conn_table[count].conn_hndl = *phConnection;
+                        goto end;
+                        }
+                }
+        rv = AEP_R_GENERAL_ERROR;
+ end:
+        CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+        return rv;
+        }
+
+
+static AEP_RV aep_return_connection(AEP_CONNECTION_HNDL hConnection)
+        {
+        int count;
+
+        CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+
+        /*Find the connection item that matches this connection handle*/
+        for(count = 0;count < MAX_PROCESS_CONNECTIONS;count ++)
+                {
+                if (aep_app_conn_table[count].conn_hndl == hConnection)
+                        {
+                        aep_app_conn_table[count].conn_state = Connected;
+                        break;
+                        }
+                }
+
+        CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+
+        return AEP_R_OK;
+        }
+
+static AEP_RV aep_close_connection(AEP_CONNECTION_HNDL hConnection)
+        {
+        int count;
+        AEP_RV rv = AEP_R_OK;
+
+        CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+
+        /*Find the connection item that matches this connection handle*/
+        for(count = 0;count < MAX_PROCESS_CONNECTIONS;count ++)
+                {
+                if (aep_app_conn_table[count].conn_hndl == hConnection)
+                        {
+                        rv = p_AEP_CloseConnection(aep_app_conn_table[count].conn_hndl);
+                        if (rv != AEP_R_OK)
+                                goto end;
+                        aep_app_conn_table[count].conn_state = NotConnected;
+                        aep_app_conn_table[count].conn_hndl  = 0;
+                        break;
+                        }
+                }
+
+ end:
+        CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+        return rv;
+        }
+
+static AEP_RV aep_close_all_connections(int use_engine_lock, int *in_use)
+        {
+        int count;
+        AEP_RV rv = AEP_R_OK;
+
+        *in_use = 0;
+        if (use_engine_lock) CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+        for (count = 0;count < MAX_PROCESS_CONNECTIONS;count ++)
+                {
+                switch (aep_app_conn_table[count].conn_state)
+                        {
+                case Connected:
+                        rv = p_AEP_CloseConnection(aep_app_conn_table[count].conn_hndl);
+                        if (rv != AEP_R_OK)
+                                goto end;
+                        aep_app_conn_table[count].conn_state = NotConnected;
+                        aep_app_conn_table[count].conn_hndl  = 0;
+                        break;
+                case InUse:
+                        (*in_use)++;
+                        break;
+                case NotConnected:
+                        break;
+                        }
+                }
+ end:
+        if (use_engine_lock) CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+        return rv;
+        }
+
+/*BigNum call back functions, used to convert OpenSSL bignums into AEP bignums.
+  Note only 32bit Openssl build support*/
+
+static AEP_RV GetBigNumSize(AEP_VOID_PTR ArbBigNum, AEP_U32* BigNumSize)
+        {
+        BIGNUM* bn;
+
+        /*Cast the ArbBigNum pointer to our BIGNUM struct*/
+        bn = (BIGNUM*) ArbBigNum;
+
+#ifdef SIXTY_FOUR_BIT_LONG
+        *BigNumSize = bn->top << 3;
+#else
+        /*Size of the bignum in bytes is equal to the bn->top (no of 32 bit
+          words) multiplies by 4*/
+        *BigNumSize = bn->top << 2;
+#endif
+
+        return AEP_R_OK;
+        }
+
+static AEP_RV MakeAEPBigNum(AEP_VOID_PTR ArbBigNum, AEP_U32 BigNumSize,
+        unsigned char* AEP_BigNum)
+        {
+        BIGNUM* bn;
+
+#ifndef SIXTY_FOUR_BIT_LONG
+        unsigned char* buf;
+        int i;
+#endif
+
+        /*Cast the ArbBigNum pointer to our BIGNUM struct*/
+        bn = (BIGNUM*) ArbBigNum;
+
+#ifdef SIXTY_FOUR_BIT_LONG
+        memcpy(AEP_BigNum, bn->d, BigNumSize);
+#else
+        /*Must copy data into a (monotone) least significant byte first format
+          performing endian conversion if necessary*/
+        for(i=0;i<bn->top;i++)
+                {
+                buf = (unsigned char*)&bn->d[i];
+
+                *((AEP_U32*)AEP_BigNum) = (AEP_U32)
+                        ((unsigned) buf[1] << 8 | buf[0]) |
+                        ((unsigned) buf[3] << 8 | buf[2])  << 16;
+
+                AEP_BigNum += 4;
+                }
+#endif
+
+        return AEP_R_OK;
+        }
+
+/*Turn an AEP Big Num back to a user big num*/
+static AEP_RV ConvertAEPBigNum(void* ArbBigNum, AEP_U32 BigNumSize,
+        unsigned char* AEP_BigNum)
+        {
+        BIGNUM* bn;
+#ifndef SIXTY_FOUR_BIT_LONG
+        int i;
+#endif
+
+        bn = (BIGNUM*)ArbBigNum;
+
+        /*Expand the result bn so that it can hold our big num.
+          Size is in bits*/
+        bn_expand(bn, (int)(BigNumSize << 3));
+
+#ifdef SIXTY_FOUR_BIT_LONG
+        bn->top = BigNumSize >> 3;
+        
+        if((BigNumSize & 7) != 0)
+                bn->top++;
+
+        memset(bn->d, 0, bn->top << 3); 
+
+        memcpy(bn->d, AEP_BigNum, BigNumSize);
+#else
+        bn->top = BigNumSize >> 2;
+ 
+        for(i=0;i<bn->top;i++)
+                {
+                bn->d[i] = (AEP_U32)
+                        ((unsigned) AEP_BigNum[3] << 8 | AEP_BigNum[2]) << 16 |
+                        ((unsigned) AEP_BigNum[1] << 8 | AEP_BigNum[0]);
+                AEP_BigNum += 4;
+                }
+#endif
+
+        return AEP_R_OK;
+}       
+        
+#endif /* !OPENSSL_NO_HW_AEP */
+#endif /* !OPENSSL_NO_HW */