1 files changed, 125 insertions, 0 deletions

diff --git a/src/lib/libcrypto/bn/bn_recp.c b/src/lib/libcrypto/bn/bn_recp.c
new file mode 100644
index 0000000000..72cd69d3fc
--- /dev/null
+++ b/src/lib/libcrypto/bn/bn_recp.c
@@ -0,0 +1,125 @@
+/* crypto/bn/bn_recp.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ * 
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ * 
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ * 
+ * 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 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 acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from 
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS 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 AUTHOR OR 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.
+ * 
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include "bn_lcl.h"
+
+int BN_mod_mul_reciprocal(r, x, y, m, i, nb, ctx)
+BIGNUM *r;
+BIGNUM *x;
+BIGNUM *y;
+BIGNUM *m;
+BIGNUM *i;
+int nb;
+BN_CTX *ctx;
+        {
+        int ret=0,j;
+        BIGNUM *a,*b,*c,*d;
+
+        a=ctx->bn[ctx->tos++];
+        b=ctx->bn[ctx->tos++];
+        c=ctx->bn[ctx->tos++];
+        d=ctx->bn[ctx->tos++];
+
+        if (x == y)
+                { if (!BN_sqr(a,x,ctx)) goto err; }
+        else
+                { if (!BN_mul(a,x,y)) goto err; }
+        if (!BN_rshift(d,a,nb)) goto err;
+        if (!BN_mul(b,d,i)) goto err;
+        if (!BN_rshift(c,b,nb)) goto err;
+        if (!BN_mul(b,m,c)) goto err;
+        if (!BN_sub(r,a,b)) goto err;
+        j=0;
+        while (BN_cmp(r,m) >= 0)
+                {
+                if (j++ > 2)
+                        {
+                        BNerr(BN_F_BN_MOD_MUL_RECIPROCAL,BN_R_BAD_RECIPROCAL);
+                        goto err;
+                        }
+                if (!BN_sub(r,r,m)) goto err;
+                }
+
+        ret=1;
+err:
+        ctx->tos-=4;
+        return(ret);
+        }
+
+int BN_reciprocal(r, m,ctx)
+BIGNUM *r;
+BIGNUM *m;
+BN_CTX *ctx;
+        {
+        int nm,ret= -1;
+        BIGNUM *t;
+
+        t=ctx->bn[ctx->tos++];
+
+        nm=BN_num_bits(m);
+        if (!BN_lshift(t,BN_value_one(),nm*2)) goto err;
+
+        if (!BN_div(r,NULL,t,m,ctx)) goto err;
+        ret=nm;
+err:
+        ctx->tos--;
+        return(ret);
+        }
+