openssl-engine-0.9.6 merge

1 files changed, 807 insertions, 0 deletions

diff --git a/src/lib/libcrypto/engine/hw_cswift.c b/src/lib/libcrypto/engine/hw_cswift.c
new file mode 100644
index 0000000000..77608b8983
--- /dev/null
+++ b/src/lib/libcrypto/engine/hw_cswift.c
@@ -0,0 +1,807 @@
+/* crypto/engine/hw_cswift.c */
+/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
+ * project 2000.
+ */
+/* ====================================================================
+ * 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/crypto.h>
+#include "cryptlib.h"
+#include <openssl/dso.h>
+#include "engine_int.h"
+#include <openssl/engine.h>
+
+#ifndef NO_HW
+#ifndef NO_HW_CSWIFT
+
+/* Attribution notice: Rainbow have generously allowed me to reproduce
+ * the necessary definitions here from their API. This means the support
+ * can build independently of whether application builders have the
+ * API or hardware. This will allow developers to easily produce software
+ * that has latent hardware support for any users that have accelerators
+ * installed, without the developers themselves needing anything extra.
+ *
+ * I have only clipped the parts from the CryptoSwift header files that
+ * are (or seem) relevant to the CryptoSwift support code. This is
+ * simply to keep the file sizes reasonable.
+ * [Geoff]
+ */
+#ifdef FLAT_INC
+#include "cswift.h"
+#else
+#include "vendor_defns/cswift.h"
+#endif
+
+static int cswift_init(void);
+static int cswift_finish(void);
+
+/* BIGNUM stuff */
+static int cswift_mod_exp(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                const BIGNUM *m, BN_CTX *ctx);
+static int cswift_mod_exp_crt(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
+                const BIGNUM *iqmp, BN_CTX *ctx);
+
+/* RSA stuff */
+static int cswift_rsa_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa);
+/* This function is aliased to mod_exp (with the mont stuff dropped). */
+static int cswift_mod_exp_mont(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+
+/* DSA stuff */
+static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa);
+static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
+                                DSA_SIG *sig, DSA *dsa);
+
+/* DH stuff */
+/* This function is alised to mod_exp (with the DH and mont dropped). */
+static int cswift_mod_exp_dh(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+
+
+/* Our internal RSA_METHOD that we provide pointers to */
+static RSA_METHOD cswift_rsa =
+        {
+        "CryptoSwift RSA method",
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        cswift_rsa_mod_exp,
+        cswift_mod_exp_mont,
+        NULL,
+        NULL,
+        0,
+        NULL,
+        NULL,
+        NULL
+        };
+
+/* Our internal DSA_METHOD that we provide pointers to */
+static DSA_METHOD cswift_dsa =
+        {
+        "CryptoSwift DSA method",
+        cswift_dsa_sign,
+        NULL, /* dsa_sign_setup */
+        cswift_dsa_verify,
+        NULL, /* dsa_mod_exp */
+        NULL, /* bn_mod_exp */
+        NULL, /* init */
+        NULL, /* finish */
+        0, /* flags */
+        NULL /* app_data */
+        };
+
+/* Our internal DH_METHOD that we provide pointers to */
+static DH_METHOD cswift_dh =
+        {
+        "CryptoSwift DH method",
+        NULL,
+        NULL,
+        cswift_mod_exp_dh,
+        NULL,
+        NULL,
+        0,
+        NULL
+        };
+
+/* Our ENGINE structure. */
+static ENGINE engine_cswift =
+        {
+        "cswift",
+        "CryptoSwift hardware engine support",
+        &cswift_rsa,
+        &cswift_dsa,
+        &cswift_dh,
+        NULL,
+        cswift_mod_exp,
+        cswift_mod_exp_crt,
+        cswift_init,
+        cswift_finish,
+        NULL, /* no ctrl() */
+        NULL, /* no load_privkey() */
+        NULL, /* no load_pubkey() */
+        0, /* no flags */
+        0, 0, /* no references */
+        NULL, NULL /* unlinked */
+        };
+
+/* As this is only ever called once, there's no need for locking
+ * (indeed - the lock will already be held by our caller!!!) */
+ENGINE *ENGINE_cswift()
+        {
+        RSA_METHOD *meth1;
+        DH_METHOD *meth2;
+
+        /* We know that the "PKCS1_SSLeay()" 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_SSLeay();
+        cswift_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
+        cswift_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
+        cswift_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
+        cswift_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
+
+        /* Much the same for Diffie-Hellman */
+        meth2 = DH_OpenSSL();
+        cswift_dh.generate_key = meth2->generate_key;
+        cswift_dh.compute_key = meth2->compute_key;
+        return &engine_cswift;
+        }
+
+/* This is a process-global DSO handle used for loading and unloading
+ * the CryptoSwift 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 *cswift_dso = NULL;
+
+/* These are the function pointers that are (un)set when the library has
+ * successfully (un)loaded. */
+t_swAcquireAccContext *p_CSwift_AcquireAccContext = NULL;
+t_swAttachKeyParam *p_CSwift_AttachKeyParam = NULL;
+t_swSimpleRequest *p_CSwift_SimpleRequest = NULL;
+t_swReleaseAccContext *p_CSwift_ReleaseAccContext = NULL;
+
+/* Used in the DSO operations. */
+static const char *CSWIFT_LIBNAME = "swift";
+static const char *CSWIFT_F1 = "swAcquireAccContext";
+static const char *CSWIFT_F2 = "swAttachKeyParam";
+static const char *CSWIFT_F3 = "swSimpleRequest";
+static const char *CSWIFT_F4 = "swReleaseAccContext";
+
+
+/* CryptoSwift 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(SW_CONTEXT_HANDLE *hac)
+        {
+        SW_STATUS status;
+ 
+        status = p_CSwift_AcquireAccContext(hac);
+        if(status != SW_OK)
+                return 0;
+        return 1;
+        }
+ 
+/* similarly to release one. */
+static void release_context(SW_CONTEXT_HANDLE hac)
+        {
+        p_CSwift_ReleaseAccContext(hac);
+        }
+
+/* (de)initialisation functions. */
+static int cswift_init()
+        {
+        SW_CONTEXT_HANDLE hac;
+        t_swAcquireAccContext *p1;
+        t_swAttachKeyParam *p2;
+        t_swSimpleRequest *p3;
+        t_swReleaseAccContext *p4;
+
+        if(cswift_dso != NULL)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_INIT,ENGINE_R_ALREADY_LOADED);
+                goto err;
+                }
+        /* Attempt to load libswift.so/swift.dll/whatever. */
+        cswift_dso = DSO_load(NULL, CSWIFT_LIBNAME, NULL,
+                DSO_FLAG_NAME_TRANSLATION);
+        if(cswift_dso == NULL)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_INIT,ENGINE_R_DSO_FAILURE);
+                goto err;
+                }
+        if(!(p1 = (t_swAcquireAccContext *)
+                                DSO_bind_func(cswift_dso, CSWIFT_F1)) ||
+                        !(p2 = (t_swAttachKeyParam *)
+                                DSO_bind_func(cswift_dso, CSWIFT_F2)) ||
+                        !(p3 = (t_swSimpleRequest *)
+                                DSO_bind_func(cswift_dso, CSWIFT_F3)) ||
+                        !(p4 = (t_swReleaseAccContext *)
+                                DSO_bind_func(cswift_dso, CSWIFT_F4)))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_INIT,ENGINE_R_DSO_FAILURE);
+                goto err;
+                }
+        /* Copy the pointers */
+        p_CSwift_AcquireAccContext = p1;
+        p_CSwift_AttachKeyParam = p2;
+        p_CSwift_SimpleRequest = p3;
+        p_CSwift_ReleaseAccContext = p4;
+        /* Try and get a context - if not, we may have a DSO but no
+         * accelerator! */
+        if(!get_context(&hac))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_INIT,ENGINE_R_UNIT_FAILURE);
+                goto err;
+                }
+        release_context(hac);
+        /* Everything's fine. */
+        return 1;
+err:
+        if(cswift_dso)
+                DSO_free(cswift_dso);
+        p_CSwift_AcquireAccContext = NULL;
+        p_CSwift_AttachKeyParam = NULL;
+        p_CSwift_SimpleRequest = NULL;
+        p_CSwift_ReleaseAccContext = NULL;
+        return 0;
+        }
+
+static int cswift_finish()
+        {
+        if(cswift_dso == NULL)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_FINISH,ENGINE_R_NOT_LOADED);
+                return 0;
+                }
+        if(!DSO_free(cswift_dso))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_FINISH,ENGINE_R_DSO_FAILURE);
+                return 0;
+                }
+        cswift_dso = NULL;
+        p_CSwift_AcquireAccContext = NULL;
+        p_CSwift_AttachKeyParam = NULL;
+        p_CSwift_SimpleRequest = NULL;
+        p_CSwift_ReleaseAccContext = NULL;
+        return 1;
+        }
+
+/* Un petit mod_exp */
+static int cswift_mod_exp(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                        const BIGNUM *m, BN_CTX *ctx)
+        {
+        /* I need somewhere to store temporary serialised values for
+         * use with the CryptoSwift API calls. A neat cheat - I'll use
+         * BIGNUMs from the BN_CTX but access their arrays directly as
+         * byte arrays <grin>. This way I don't have to clean anything
+         * up. */
+        BIGNUM *modulus;
+        BIGNUM *exponent;
+        BIGNUM *argument;
+        BIGNUM *result;
+        SW_STATUS sw_status;
+        SW_LARGENUMBER arg, res;
+        SW_PARAM sw_param;
+        SW_CONTEXT_HANDLE hac;
+        int to_return, acquired;
+ 
+        modulus = exponent = argument = result = NULL;
+        to_return = 0; /* expect failure */
+        acquired = 0;
+ 
+        if(!get_context(&hac))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP,ENGINE_R_GET_HANDLE_FAILED);
+                goto err;
+                }
+        acquired = 1;
+        /* Prepare the params */
+        modulus = BN_CTX_get(ctx);
+        exponent = BN_CTX_get(ctx);
+        argument = BN_CTX_get(ctx);
+        result = BN_CTX_get(ctx);
+        if(!modulus || !exponent || !argument || !result)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP,ENGINE_R_BN_CTX_FULL);
+                goto err;
+                }
+        if(!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, p->top) ||
+                !bn_wexpand(argument, a->top) || !bn_wexpand(result, m->top))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP,ENGINE_R_BN_EXPAND_FAIL);
+                goto err;
+                }
+        sw_param.type = SW_ALG_EXP;
+        sw_param.up.exp.modulus.nbytes = BN_bn2bin(m,
+                (unsigned char *)modulus->d);
+        sw_param.up.exp.modulus.value = (unsigned char *)modulus->d;
+        sw_param.up.exp.exponent.nbytes = BN_bn2bin(p,
+                (unsigned char *)exponent->d);
+        sw_param.up.exp.exponent.value = (unsigned char *)exponent->d;
+        /* Attach the key params */
+        sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
+        switch(sw_status)
+                {
+        case SW_OK:
+                break;
+        case SW_ERR_INPUT_SIZE:
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP,
+                        ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
+                goto err;
+        default:
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                }
+                goto err;
+                }
+        /* Prepare the argument and response */
+        arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
+        arg.value = (unsigned char *)argument->d;
+        res.nbytes = BN_num_bytes(m);
+        memset(result->d, 0, res.nbytes);
+        res.value = (unsigned char *)result->d;
+        /* Perform the operation */
+        if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP, &arg, 1,
+                &res, 1)) != SW_OK)
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                goto err;
+                }
+        /* Convert the response */
+        BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
+        to_return = 1;
+err:
+        if(acquired)
+                release_context(hac);
+        if(modulus) ctx->tos--;
+        if(exponent) ctx->tos--;
+        if(argument) ctx->tos--;
+        if(result) ctx->tos--;
+        return to_return;
+        }
+
+/* Un petit mod_exp chinois */
+static int cswift_mod_exp_crt(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                        const BIGNUM *q, const BIGNUM *dmp1,
+                        const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
+        {
+        SW_STATUS sw_status;
+        SW_LARGENUMBER arg, res;
+        SW_PARAM sw_param;
+        SW_CONTEXT_HANDLE hac;
+        BIGNUM *rsa_p = NULL;
+        BIGNUM *rsa_q = NULL;
+        BIGNUM *rsa_dmp1 = NULL;
+        BIGNUM *rsa_dmq1 = NULL;
+        BIGNUM *rsa_iqmp = NULL;
+        BIGNUM *argument = NULL;
+        BIGNUM *result = NULL;
+        int to_return = 0; /* expect failure */
+        int acquired = 0;
+ 
+        if(!get_context(&hac))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP_CRT,ENGINE_R_GET_HANDLE_FAILED);
+                goto err;
+                }
+        acquired = 1;
+        /* Prepare the params */
+        rsa_p = BN_CTX_get(ctx);
+        rsa_q = BN_CTX_get(ctx);
+        rsa_dmp1 = BN_CTX_get(ctx);
+        rsa_dmq1 = BN_CTX_get(ctx);
+        rsa_iqmp = BN_CTX_get(ctx);
+        argument = BN_CTX_get(ctx);
+        result = BN_CTX_get(ctx);
+        if(!rsa_p || !rsa_q || !rsa_dmp1 || !rsa_dmq1 || !rsa_iqmp ||
+                        !argument || !result)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP_CRT,ENGINE_R_BN_CTX_FULL);
+                goto err;
+                }
+        if(!bn_wexpand(rsa_p, p->top) || !bn_wexpand(rsa_q, q->top) ||
+                        !bn_wexpand(rsa_dmp1, dmp1->top) ||
+                        !bn_wexpand(rsa_dmq1, dmq1->top) ||
+                        !bn_wexpand(rsa_iqmp, iqmp->top) ||
+                        !bn_wexpand(argument, a->top) ||
+                        !bn_wexpand(result, p->top + q->top))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP_CRT,ENGINE_R_BN_EXPAND_FAIL);
+                goto err;
+                }
+        sw_param.type = SW_ALG_CRT;
+        sw_param.up.crt.p.nbytes = BN_bn2bin(p, (unsigned char *)rsa_p->d);
+        sw_param.up.crt.p.value = (unsigned char *)rsa_p->d;
+        sw_param.up.crt.q.nbytes = BN_bn2bin(q, (unsigned char *)rsa_q->d);
+        sw_param.up.crt.q.value = (unsigned char *)rsa_q->d;
+        sw_param.up.crt.dmp1.nbytes = BN_bn2bin(dmp1,
+                (unsigned char *)rsa_dmp1->d);
+        sw_param.up.crt.dmp1.value = (unsigned char *)rsa_dmp1->d;
+        sw_param.up.crt.dmq1.nbytes = BN_bn2bin(dmq1,
+                (unsigned char *)rsa_dmq1->d);
+        sw_param.up.crt.dmq1.value = (unsigned char *)rsa_dmq1->d;
+        sw_param.up.crt.iqmp.nbytes = BN_bn2bin(iqmp,
+                (unsigned char *)rsa_iqmp->d);
+        sw_param.up.crt.iqmp.value = (unsigned char *)rsa_iqmp->d;
+        /* Attach the key params */
+        sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
+        switch(sw_status)
+                {
+        case SW_OK:
+                break;
+        case SW_ERR_INPUT_SIZE:
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP_CRT,
+                        ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
+                goto err;
+        default:
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP_CRT,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                }
+                goto err;
+                }
+        /* Prepare the argument and response */
+        arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
+        arg.value = (unsigned char *)argument->d;
+        res.nbytes = 2 * BN_num_bytes(p);
+        memset(result->d, 0, res.nbytes);
+        res.value = (unsigned char *)result->d;
+        /* Perform the operation */
+        if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP_CRT, &arg, 1,
+                &res, 1)) != SW_OK)
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_MOD_EXP_CRT,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                goto err;
+                }
+        /* Convert the response */
+        BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
+        to_return = 1;
+err:
+        if(acquired)
+                release_context(hac);
+        if(rsa_p) ctx->tos--;
+        if(rsa_q) ctx->tos--;
+        if(rsa_dmp1) ctx->tos--;
+        if(rsa_dmq1) ctx->tos--;
+        if(rsa_iqmp) ctx->tos--;
+        if(argument) ctx->tos--;
+        if(result) ctx->tos--;
+        return to_return;
+        }
+ 
+static int cswift_rsa_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
+        {
+        BN_CTX *ctx;
+        int to_return = 0;
+
+        if((ctx = BN_CTX_new()) == NULL)
+                goto err;
+        if(!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_RSA_MOD_EXP,ENGINE_R_MISSING_KEY_COMPONENTS);
+                goto err;
+                }
+        to_return = cswift_mod_exp_crt(r0, I, rsa->p, rsa->q, rsa->dmp1,
+                rsa->dmq1, rsa->iqmp, ctx);
+err:
+        if(ctx)
+                BN_CTX_free(ctx);
+        return to_return;
+        }
+
+/* This function is aliased to mod_exp (with the mont stuff dropped). */
+static int cswift_mod_exp_mont(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
+        {
+        return cswift_mod_exp(r, a, p, m, ctx);
+        }
+
+static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa)
+        {
+        SW_CONTEXT_HANDLE hac;
+        SW_PARAM sw_param;
+        SW_STATUS sw_status;
+        SW_LARGENUMBER arg, res;
+        unsigned char *ptr;
+        BN_CTX *ctx;
+        BIGNUM *dsa_p = NULL;
+        BIGNUM *dsa_q = NULL;
+        BIGNUM *dsa_g = NULL;
+        BIGNUM *dsa_key = NULL;
+        BIGNUM *result = NULL;
+        DSA_SIG *to_return = NULL;
+        int acquired = 0;
+
+        if((ctx = BN_CTX_new()) == NULL)
+                goto err;
+        if(!get_context(&hac))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_SIGN,ENGINE_R_GET_HANDLE_FAILED);
+                goto err;
+                }
+        acquired = 1;
+        /* Prepare the params */
+        dsa_p = BN_CTX_get(ctx);
+        dsa_q = BN_CTX_get(ctx);
+        dsa_g = BN_CTX_get(ctx);
+        dsa_key = BN_CTX_get(ctx);
+        result = BN_CTX_get(ctx);
+        if(!dsa_p || !dsa_q || !dsa_g || !dsa_key || !result)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_SIGN,ENGINE_R_BN_CTX_FULL);
+                goto err;
+                }
+        if(!bn_wexpand(dsa_p, dsa->p->top) ||
+                        !bn_wexpand(dsa_q, dsa->q->top) ||
+                        !bn_wexpand(dsa_g, dsa->g->top) ||
+                        !bn_wexpand(dsa_key, dsa->priv_key->top) ||
+                        !bn_wexpand(result, dsa->p->top))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_SIGN,ENGINE_R_BN_EXPAND_FAIL);
+                goto err;
+                }
+        sw_param.type = SW_ALG_DSA;
+        sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
+                                (unsigned char *)dsa_p->d);
+        sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
+        sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
+                                (unsigned char *)dsa_q->d);
+        sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
+        sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
+                                (unsigned char *)dsa_g->d);
+        sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
+        sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->priv_key,
+                                (unsigned char *)dsa_key->d);
+        sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
+        /* Attach the key params */
+        sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
+        switch(sw_status)
+                {
+        case SW_OK:
+                break;
+        case SW_ERR_INPUT_SIZE:
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_SIGN,
+                        ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
+                goto err;
+        default:
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_SIGN,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                }
+                goto err;
+                }
+        /* Prepare the argument and response */
+        arg.nbytes = dlen;
+        arg.value = (unsigned char *)dgst;
+        res.nbytes = BN_num_bytes(dsa->p);
+        memset(result->d, 0, res.nbytes);
+        res.value = (unsigned char *)result->d;
+        /* Perform the operation */
+        sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_SIGN, &arg, 1,
+                &res, 1);
+        if(sw_status != SW_OK)
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_SIGN,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                goto err;
+                }
+        /* Convert the response */
+        ptr = (unsigned char *)result->d;
+        if((to_return = DSA_SIG_new()) == NULL)
+                goto err;
+        to_return->r = BN_bin2bn((unsigned char *)result->d, 20, NULL);
+        to_return->s = BN_bin2bn((unsigned char *)result->d + 20, 20, NULL);
+
+err:
+        if(acquired)
+                release_context(hac);
+        if(dsa_p) ctx->tos--;
+        if(dsa_q) ctx->tos--;
+        if(dsa_g) ctx->tos--;
+        if(dsa_key) ctx->tos--;
+        if(result) ctx->tos--;
+        if(ctx)
+                BN_CTX_free(ctx);
+        return to_return;
+        }
+
+static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
+                                DSA_SIG *sig, DSA *dsa)
+        {
+        SW_CONTEXT_HANDLE hac;
+        SW_PARAM sw_param;
+        SW_STATUS sw_status;
+        SW_LARGENUMBER arg[2], res;
+        unsigned long sig_result;
+        BN_CTX *ctx;
+        BIGNUM *dsa_p = NULL;
+        BIGNUM *dsa_q = NULL;
+        BIGNUM *dsa_g = NULL;
+        BIGNUM *dsa_key = NULL;
+        BIGNUM *argument = NULL;
+        int to_return = -1;
+        int acquired = 0;
+
+        if((ctx = BN_CTX_new()) == NULL)
+                goto err;
+        if(!get_context(&hac))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_VERIFY,ENGINE_R_GET_HANDLE_FAILED);
+                goto err;
+                }
+        acquired = 1;
+        /* Prepare the params */
+        dsa_p = BN_CTX_get(ctx);
+        dsa_q = BN_CTX_get(ctx);
+        dsa_g = BN_CTX_get(ctx);
+        dsa_key = BN_CTX_get(ctx);
+        argument = BN_CTX_get(ctx);
+        if(!dsa_p || !dsa_q || !dsa_g || !dsa_key || !argument)
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_VERIFY,ENGINE_R_BN_CTX_FULL);
+                goto err;
+                }
+        if(!bn_wexpand(dsa_p, dsa->p->top) ||
+                        !bn_wexpand(dsa_q, dsa->q->top) ||
+                        !bn_wexpand(dsa_g, dsa->g->top) ||
+                        !bn_wexpand(dsa_key, dsa->pub_key->top) ||
+                        !bn_wexpand(argument, 40))
+                {
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_VERIFY,ENGINE_R_BN_EXPAND_FAIL);
+                goto err;
+                }
+        sw_param.type = SW_ALG_DSA;
+        sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
+                                (unsigned char *)dsa_p->d);
+        sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
+        sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
+                                (unsigned char *)dsa_q->d);
+        sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
+        sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
+                                (unsigned char *)dsa_g->d);
+        sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
+        sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->pub_key,
+                                (unsigned char *)dsa_key->d);
+        sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
+        /* Attach the key params */
+        sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
+        switch(sw_status)
+                {
+        case SW_OK:
+                break;
+        case SW_ERR_INPUT_SIZE:
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_VERIFY,
+                        ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
+                goto err;
+        default:
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_VERIFY,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                }
+                goto err;
+                }
+        /* Prepare the argument and response */
+        arg[0].nbytes = dgst_len;
+        arg[0].value = (unsigned char *)dgst;
+        arg[1].nbytes = 40;
+        arg[1].value = (unsigned char *)argument->d;
+        memset(arg[1].value, 0, 40);
+        BN_bn2bin(sig->r, arg[1].value + 20 - BN_num_bytes(sig->r));
+        BN_bn2bin(sig->s, arg[1].value + 40 - BN_num_bytes(sig->s));
+        res.nbytes = 4; /* unsigned long */
+        res.value = (unsigned char *)(&sig_result);
+        /* Perform the operation */
+        sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_VERIFY, arg, 2,
+                &res, 1);
+        if(sw_status != SW_OK)
+                {
+                char tmpbuf[20];
+                ENGINEerr(ENGINE_F_CSWIFT_DSA_VERIFY,ENGINE_R_REQUEST_FAILED);
+                sprintf(tmpbuf, "%ld", sw_status);
+                ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
+                goto err;
+                }
+        /* Convert the response */
+        to_return = ((sig_result == 0) ? 0 : 1);
+
+err:
+        if(acquired)
+                release_context(hac);
+        if(dsa_p) ctx->tos--;
+        if(dsa_q) ctx->tos--;
+        if(dsa_g) ctx->tos--;
+        if(dsa_key) ctx->tos--;
+        if(argument) ctx->tos--;
+        if(ctx)
+                BN_CTX_free(ctx);
+        return to_return;
+        }
+
+/* This function is aliased to mod_exp (with the dh and mont dropped). */
+static int cswift_mod_exp_dh(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
+        {
+        return cswift_mod_exp(r, a, p, m, ctx);
+        }
+
+#endif /* !NO_HW_CSWIFT */
+#endif /* !NO_HW */