1 files changed, 509 insertions, 0 deletions

diff --git a/src/lib/libcrypto/bn/bn_mont.c b/src/lib/libcrypto/bn/bn_mont.c
new file mode 100644
index 0000000000..427b5cf4df
--- /dev/null
+++ b/src/lib/libcrypto/bn/bn_mont.c
@@ -0,0 +1,509 @@
+/* crypto/bn/bn_mont.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.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2006 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
+ *    openssl-core@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).
+ *
+ */
+
+/*
+ * Details about Montgomery multiplication algorithms can be found at
+ * http://security.ece.orst.edu/publications.html, e.g.
+ * http://security.ece.orst.edu/koc/papers/j37acmon.pdf and
+ * sections 3.8 and 4.2 in http://security.ece.orst.edu/koc/papers/r01rsasw.pdf
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include "bn_lcl.h"
+
+#define MONT_WORD /* use the faster word-based algorithm */
+
+#ifdef MONT_WORD
+static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont);
+#endif
+
+int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
+                          BN_MONT_CTX *mont, BN_CTX *ctx)
+        {
+        BIGNUM *tmp;
+        int ret=0;
+#if defined(OPENSSL_BN_ASM_MONT) && defined(MONT_WORD)
+        int num = mont->N.top;
+
+        if (num>1 && a->top==num && b->top==num)
+                {
+                if (bn_wexpand(r,num) == NULL) return(0);
+                if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,mont->n0,num))
+                        {
+                        r->neg = a->neg^b->neg;
+                        r->top = num;
+                        bn_correct_top(r);
+                        return(1);
+                        }
+                }
+#endif
+
+        BN_CTX_start(ctx);
+        tmp = BN_CTX_get(ctx);
+        if (tmp == NULL) goto err;
+
+        bn_check_top(tmp);
+        if (a == b)
+                {
+                if (!BN_sqr(tmp,a,ctx)) goto err;
+                }
+        else
+                {
+                if (!BN_mul(tmp,a,b,ctx)) goto err;
+                }
+        /* reduce from aRR to aR */
+#ifdef MONT_WORD
+        if (!BN_from_montgomery_word(r,tmp,mont)) goto err;
+#else
+        if (!BN_from_montgomery(r,tmp,mont,ctx)) goto err;
+#endif
+        bn_check_top(r);
+        ret=1;
+err:
+        BN_CTX_end(ctx);
+        return(ret);
+        }
+
+#ifdef MONT_WORD
+static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont)
+        {
+        BIGNUM *n;
+        BN_ULONG *ap,*np,*rp,n0,v,carry;
+        int nl,max,i;
+
+        n= &(mont->N);
+        nl=n->top;
+        if (nl == 0) { ret->top=0; return(1); }
+
+        max=(2*nl); /* carry is stored separately */
+        if (bn_wexpand(r,max) == NULL) return(0);
+
+        r->neg^=n->neg;
+        np=n->d;
+        rp=r->d;
+
+        /* clear the top words of T */
+#if 1
+        for (i=r->top; i<max; i++) /* memset? XXX */
+                rp[i]=0;
+#else
+        memset(&(rp[r->top]),0,(max-r->top)*sizeof(BN_ULONG)); 
+#endif
+
+        r->top=max;
+        n0=mont->n0[0];
+
+#ifdef BN_COUNT
+        fprintf(stderr,"word BN_from_montgomery_word %d * %d\n",nl,nl);
+#endif
+        for (carry=0, i=0; i<nl; i++, rp++)
+                {
+#ifdef __TANDEM
+                {
+                   long long t1;
+                   long long t2;
+                   long long t3;
+                   t1 = rp[0] * (n0 & 0177777);
+                   t2 = 037777600000l;
+                   t2 = n0 & t2;
+                   t3 = rp[0] & 0177777;
+                   t2 = (t3 * t2) & BN_MASK2;
+                   t1 = t1 + t2;
+                   v=bn_mul_add_words(rp,np,nl,(BN_ULONG) t1);
+                }
+#else
+                v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2);
+#endif
+                v = (v+carry+rp[nl])&BN_MASK2;
+                carry |= (v != rp[nl]);
+                carry &= (v <= rp[nl]);
+                rp[nl]=v;
+                }
+
+        if (bn_wexpand(ret,nl) == NULL) return(0);
+        ret->top=nl;
+        ret->neg=r->neg;
+
+        rp=ret->d;
+        ap=&(r->d[nl]);
+
+#define BRANCH_FREE 1
+#if BRANCH_FREE
+        {
+        BN_ULONG *nrp;
+        size_t m;
+
+        v=bn_sub_words(rp,ap,np,nl)-carry;
+        /* if subtraction result is real, then
+         * trick unconditional memcpy below to perform in-place
+         * "refresh" instead of actual copy. */
+        m=(0-(size_t)v);
+        nrp=(BN_ULONG *)(((PTR_SIZE_INT)rp&~m)|((PTR_SIZE_INT)ap&m));
+
+        for (i=0,nl-=4; i<nl; i+=4)
+                {
+                BN_ULONG t1,t2,t3,t4;
+                
+                t1=nrp[i+0];
+                t2=nrp[i+1];
+                t3=nrp[i+2];    ap[i+0]=0;
+                t4=nrp[i+3];    ap[i+1]=0;
+                rp[i+0]=t1;     ap[i+2]=0;
+                rp[i+1]=t2;     ap[i+3]=0;
+                rp[i+2]=t3;
+                rp[i+3]=t4;
+                }
+        for (nl+=4; i<nl; i++)
+                rp[i]=nrp[i], ap[i]=0;
+        }
+#else
+        if (bn_sub_words (rp,ap,np,nl)-carry)
+                memcpy(rp,ap,nl*sizeof(BN_ULONG));
+#endif
+        bn_correct_top(r);
+        bn_correct_top(ret);
+        bn_check_top(ret);
+
+        return(1);
+        }
+#endif  /* MONT_WORD */
+
+int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
+             BN_CTX *ctx)
+        {
+        int retn=0;
+#ifdef MONT_WORD
+        BIGNUM *t;
+
+        BN_CTX_start(ctx);
+        if ((t = BN_CTX_get(ctx)) && BN_copy(t,a))
+                retn = BN_from_montgomery_word(ret,t,mont);
+        BN_CTX_end(ctx);
+#else /* !MONT_WORD */
+        BIGNUM *t1,*t2;
+
+        BN_CTX_start(ctx);
+        t1 = BN_CTX_get(ctx);
+        t2 = BN_CTX_get(ctx);
+        if (t1 == NULL || t2 == NULL) goto err;
+        
+        if (!BN_copy(t1,a)) goto err;
+        BN_mask_bits(t1,mont->ri);
+
+        if (!BN_mul(t2,t1,&mont->Ni,ctx)) goto err;
+        BN_mask_bits(t2,mont->ri);
+
+        if (!BN_mul(t1,t2,&mont->N,ctx)) goto err;
+        if (!BN_add(t2,a,t1)) goto err;
+        if (!BN_rshift(ret,t2,mont->ri)) goto err;
+
+        if (BN_ucmp(ret, &(mont->N)) >= 0)
+                {
+                if (!BN_usub(ret,ret,&(mont->N))) goto err;
+                }
+        retn=1;
+        bn_check_top(ret);
+ err:
+        BN_CTX_end(ctx);
+#endif /* MONT_WORD */
+        return(retn);
+        }
+
+BN_MONT_CTX *BN_MONT_CTX_new(void)
+        {
+        BN_MONT_CTX *ret;
+
+        if ((ret=(BN_MONT_CTX *)OPENSSL_malloc(sizeof(BN_MONT_CTX))) == NULL)
+                return(NULL);
+
+        BN_MONT_CTX_init(ret);
+        ret->flags=BN_FLG_MALLOCED;
+        return(ret);
+        }
+
+void BN_MONT_CTX_init(BN_MONT_CTX *ctx)
+        {
+        ctx->ri=0;
+        BN_init(&(ctx->RR));
+        BN_init(&(ctx->N));
+        BN_init(&(ctx->Ni));
+        ctx->n0[0] = ctx->n0[1] = 0;
+        ctx->flags=0;
+        }
+
+void BN_MONT_CTX_free(BN_MONT_CTX *mont)
+        {
+        if(mont == NULL)
+            return;
+
+        BN_free(&(mont->RR));
+        BN_free(&(mont->N));
+        BN_free(&(mont->Ni));
+        if (mont->flags & BN_FLG_MALLOCED)
+                OPENSSL_free(mont);
+        }
+
+int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx)
+        {
+        int ret = 0;
+        BIGNUM *Ri,*R;
+
+        BN_CTX_start(ctx);
+        if((Ri = BN_CTX_get(ctx)) == NULL) goto err;
+        R= &(mont->RR);                                 /* grab RR as a temp */
+        if (!BN_copy(&(mont->N),mod)) goto err;         /* Set N */
+        mont->N.neg = 0;
+
+#ifdef MONT_WORD
+                {
+                BIGNUM tmod;
+                BN_ULONG buf[2];
+
+                BN_init(&tmod);
+                tmod.d=buf;
+                tmod.dmax=2;
+                tmod.neg=0;
+
+                mont->ri=(BN_num_bits(mod)+(BN_BITS2-1))/BN_BITS2*BN_BITS2;
+
+#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)
+                /* Only certain BN_BITS2<=32 platforms actually make use of
+                 * n0[1], and we could use the #else case (with a shorter R
+                 * value) for the others.  However, currently only the assembler
+                 * files do know which is which. */
+
+                BN_zero(R);
+                if (!(BN_set_bit(R,2*BN_BITS2))) goto err;
+
+                                                                tmod.top=0;
+                if ((buf[0] = mod->d[0]))                       tmod.top=1;
+                if ((buf[1] = mod->top>1 ? mod->d[1] : 0))      tmod.top=2;
+
+                if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
+                        goto err;
+                if (!BN_lshift(Ri,Ri,2*BN_BITS2)) goto err; /* R*Ri */
+                if (!BN_is_zero(Ri))
+                        {
+                        if (!BN_sub_word(Ri,1)) goto err;
+                        }
+                else /* if N mod word size == 1 */
+                        {
+                        if (bn_expand(Ri,(int)sizeof(BN_ULONG)*2) == NULL)
+                                goto err;
+                        /* Ri-- (mod double word size) */
+                        Ri->neg=0;
+                        Ri->d[0]=BN_MASK2;
+                        Ri->d[1]=BN_MASK2;
+                        Ri->top=2;
+                        }
+                if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
+                /* Ni = (R*Ri-1)/N,
+                 * keep only couple of least significant words: */
+                mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
+                mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0;
+#else
+                BN_zero(R);
+                if (!(BN_set_bit(R,BN_BITS2))) goto err;        /* R */
+
+                buf[0]=mod->d[0]; /* tmod = N mod word size */
+                buf[1]=0;
+                tmod.top = buf[0] != 0 ? 1 : 0;
+                                                        /* Ri = R^-1 mod N*/
+                if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
+                        goto err;
+                if (!BN_lshift(Ri,Ri,BN_BITS2)) goto err; /* R*Ri */
+                if (!BN_is_zero(Ri))
+                        {
+                        if (!BN_sub_word(Ri,1)) goto err;
+                        }
+                else /* if N mod word size == 1 */
+                        {
+                        if (!BN_set_word(Ri,BN_MASK2)) goto err;  /* Ri-- (mod word size) */
+                        }
+                if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
+                /* Ni = (R*Ri-1)/N,
+                 * keep only least significant word: */
+                mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
+                mont->n0[1] = 0;
+#endif
+                }
+#else /* !MONT_WORD */
+                { /* bignum version */
+                mont->ri=BN_num_bits(&mont->N);
+                BN_zero(R);
+                if (!BN_set_bit(R,mont->ri)) goto err;  /* R = 2^ri */
+                                                        /* Ri = R^-1 mod N*/
+                if ((BN_mod_inverse(Ri,R,&mont->N,ctx)) == NULL)
+                        goto err;
+                if (!BN_lshift(Ri,Ri,mont->ri)) goto err; /* R*Ri */
+                if (!BN_sub_word(Ri,1)) goto err;
+                                                        /* Ni = (R*Ri-1) / N */
+                if (!BN_div(&(mont->Ni),NULL,Ri,&mont->N,ctx)) goto err;
+                }
+#endif
+
+        /* setup RR for conversions */
+        BN_zero(&(mont->RR));
+        if (!BN_set_bit(&(mont->RR),mont->ri*2)) goto err;
+        if (!BN_mod(&(mont->RR),&(mont->RR),&(mont->N),ctx)) goto err;
+
+        ret = 1;
+err:
+        BN_CTX_end(ctx);
+        return ret;
+        }
+
+BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from)
+        {
+        if (to == from) return(to);
+
+        if (!BN_copy(&(to->RR),&(from->RR))) return NULL;
+        if (!BN_copy(&(to->N),&(from->N))) return NULL;
+        if (!BN_copy(&(to->Ni),&(from->Ni))) return NULL;
+        to->ri=from->ri;
+        to->n0[0]=from->n0[0];
+        to->n0[1]=from->n0[1];
+        return(to);
+        }
+
+BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock,
+                                        const BIGNUM *mod, BN_CTX *ctx)
+        {
+        int got_write_lock = 0;
+        BN_MONT_CTX *ret;
+
+        CRYPTO_r_lock(lock);
+        if (!*pmont)
+                {
+                CRYPTO_r_unlock(lock);
+                CRYPTO_w_lock(lock);
+                got_write_lock = 1;
+
+                if (!*pmont)
+                        {
+                        ret = BN_MONT_CTX_new();
+                        if (ret && !BN_MONT_CTX_set(ret, mod, ctx))
+                                BN_MONT_CTX_free(ret);
+                        else
+                                *pmont = ret;
+                        }
+                }
+        
+        ret = *pmont;
+        
+        if (got_write_lock)
+                CRYPTO_w_unlock(lock);
+        else
+                CRYPTO_r_unlock(lock);
+                
+        return ret;
+        }