1 files changed, 174 insertions, 0 deletions

diff --git a/src/lib/libcrypto/engine/engine_openssl.c b/src/lib/libcrypto/engine/engine_openssl.c
new file mode 100644
index 0000000000..9636f51168
--- /dev/null
+++ b/src/lib/libcrypto/engine/engine_openssl.c
@@ -0,0 +1,174 @@
+/* crypto/engine/engine_openssl.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 "engine_int.h"
+#include <openssl/engine.h>
+#include <openssl/dso.h>
+#include <openssl/rsa.h>
+#include <openssl/dsa.h>
+#include <openssl/dh.h>
+#include <openssl/rand.h>
+#include <openssl/bn.h>
+
+/* This is the only function we need to implement as OpenSSL
+ * doesn't have a native CRT mod_exp. Perhaps this should be
+ * BN_mod_exp_crt and moved into crypto/bn/ ?? ... dunno. */
+static int openssl_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);
+
+/* The ENGINE structure that can be pointed to. */
+static ENGINE engine_openssl =
+        {
+        "openssl",
+        "Software default engine support",
+        NULL,
+        NULL,
+        NULL, /* these methods are "stolen" in ENGINE_openssl() */
+        NULL,
+        NULL,
+        openssl_mod_exp_crt,
+        NULL, /* no init() */
+        NULL, /* no 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_openssl()
+        {
+        /* We need to populate our structure with the software pointers
+         * that we want to steal. */
+        engine_openssl.rsa_meth = RSA_get_default_openssl_method();
+        engine_openssl.dsa_meth = DSA_get_default_openssl_method();
+        engine_openssl.dh_meth = DH_get_default_openssl_method();
+        engine_openssl.rand_meth = RAND_SSLeay();
+        engine_openssl.bn_mod_exp = BN_mod_exp;
+        return &engine_openssl;
+        }
+
+/* Chinese Remainder Theorem, taken and adapted from rsa_eay.c */
+static int openssl_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)
+        {
+        BIGNUM r1,m1;
+        int ret=0;
+        BN_CTX *bn_ctx;
+        BIGNUM *temp_bn = NULL;
+
+        if (ctx)
+                bn_ctx = ctx;
+        else
+                if ((bn_ctx=BN_CTX_new()) == NULL) goto err;
+        BN_init(&m1);
+        BN_init(&r1);
+        /* BN_mul() cannot accept const BIGNUMs so I use the BN_CTX
+         * to duplicate what I need. <sigh> */
+        if ((temp_bn = BN_CTX_get(bn_ctx)) == NULL) goto err;
+        if (!BN_copy(temp_bn, iqmp)) goto err;
+ 
+        if (!BN_mod(&r1, a, q, bn_ctx)) goto err;
+        if (!engine_openssl.bn_mod_exp(&m1, &r1, dmq1, q, bn_ctx))
+                goto err;
+ 
+        if (!BN_mod(&r1, a, p, bn_ctx)) goto err;
+        if (!engine_openssl.bn_mod_exp(r, &r1, dmp1, p, bn_ctx))
+                goto err;
+
+        if (!BN_sub(r, r, &m1)) goto err;
+        /* This will help stop the size of r0 increasing, which does
+         * affect the multiply if it optimised for a power of 2 size */
+        if (r->neg)
+                if (!BN_add(r, r, p)) goto err;
+ 
+        if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
+        if (!BN_mod(r, &r1, p, bn_ctx)) goto err;
+        /* If p < q it is occasionally possible for the correction of
+         * adding 'p' if r is negative above to leave the result still
+         * negative. This can break the private key operations: the following
+         * second correction should *always* correct this rare occurrence.
+         * This will *never* happen with OpenSSL generated keys because
+         * they ensure p > q [steve]
+         */
+        if (r->neg)
+                if (!BN_add(r, r, p)) goto err;
+        /* Again, BN_mul() will need non-const values. */
+        if (!BN_copy(temp_bn, q)) goto err;
+        if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
+        if (!BN_add(r, &r1, &m1)) goto err;
+ 
+        ret=1;
+err:
+        BN_clear_free(&m1);
+        BN_clear_free(&r1);
+        if (temp_bn)
+                bn_ctx->tos--;
+        if (!ctx)
+                BN_CTX_free(bn_ctx);
+        return(ret);
+        }