1 files changed, 530 insertions, 0 deletions

diff --git a/pwmanager/libcrypt/mpi/mpih-mul.c b/pwmanager/libcrypt/mpi/mpih-mul.c
new file mode 100644
index 0000000..e1f6f58
--- a/dev/null
+++ b/pwmanager/libcrypt/mpi/mpih-mul.c
@@ -0,0 +1,530 @@
+/* mpih-mul.c  -  MPI helper functions
+ * Copyright (C) 1994, 1996, 1998, 1999, 2000,
+ *               2001, 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+         * Actually it's the same code with only minor changes in the
+         * way the data is stored; this is to support the abstraction
+         * of an optional secure memory allocation which may be used
+         * to avoid revealing of sensitive data due to paging etc.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mpi-internal.h"
+#include "longlong.h"
+#include "g10lib.h"
+
+#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
+            do {                                        \
+                if( (size) < KARATSUBA_THRESHOLD )      \
+                    mul_n_basecase (prodp, up, vp, size);\
+                else                                    \
+                    mul_n (prodp, up, vp, size, tspace);\
+    } while (0);
+
+#define MPN_SQR_N_RECURSE(prodp, up, size, tspace) \
+            do {                                    \
+                if ((size) < KARATSUBA_THRESHOLD)    \
+                    _gcry_mpih_sqr_n_basecase (prodp, up, size); \
+                else                                \
+                    _gcry_mpih_sqr_n (prodp, up, size, tspace); \
+    } while (0);
+
+
+
+
+/* Multiply the natural numbers u (pointed to by UP) and v (pointed to by VP),
+ * both with SIZE limbs, and store the result at PRODP.  2 * SIZE limbs are
+ * always stored.  Return the most significant limb.
+ *
+ * Argument constraints:
+ * 1. PRODP != UP and PRODP != VP, i.e. the destination
+ *    must be distinct from the multiplier and the multiplicand.
+ *
+ *
+ * Handle simple cases with traditional multiplication.
+ *
+ * This is the most critical code of multiplication.  All multiplies rely
+ * on this, both small and huge.  Small ones arrive here immediately.  Huge
+ * ones arrive here as this is the base case for Karatsuba's recursive
+ * algorithm below.
+ */
+
+static mpi_limb_t
+mul_n_basecase( mpi_ptr_t prodp, mpi_ptr_t up,
+                                 mpi_ptr_t vp, mpi_size_t size)
+{
+    mpi_size_t i;
+    mpi_limb_t cy;
+    mpi_limb_t v_limb;
+
+    /* Multiply by the first limb in V separately, as the result can be
+     * stored (not added) to PROD.  We also avoid a loop for zeroing.  */
+    v_limb = vp[0];
+    if( v_limb <= 1 ) {
+        if( v_limb == 1 )
+            MPN_COPY( prodp, up, size );
+        else
+            MPN_ZERO( prodp, size );
+        cy = 0;
+    }
+    else
+        cy = _gcry_mpih_mul_1( prodp, up, size, v_limb );
+
+    prodp[size] = cy;
+    prodp++;
+
+    /* For each iteration in the outer loop, multiply one limb from
+     * U with one limb from V, and add it to PROD.  */
+    for( i = 1; i < size; i++ ) {
+        v_limb = vp[i];
+        if( v_limb <= 1 ) {
+            cy = 0;
+            if( v_limb == 1 )
+               cy = _gcry_mpih_add_n(prodp, prodp, up, size);
+        }
+        else
+            cy = _gcry_mpih_addmul_1(prodp, up, size, v_limb);
+
+        prodp[size] = cy;
+        prodp++;
+    }
+
+    return cy;
+}
+
+
+static void
+mul_n( mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp,
+                        mpi_size_t size, mpi_ptr_t tspace )
+{
+    if( size & 1 ) {
+      /* The size is odd, and the code below doesn't handle that.
+       * Multiply the least significant (size - 1) limbs with a recursive
+       * call, and handle the most significant limb of S1 and S2
+       * separately.
+       * A slightly faster way to do this would be to make the Karatsuba
+       * code below behave as if the size were even, and let it check for
+       * odd size in the end.  I.e., in essence move this code to the end.
+       * Doing so would save us a recursive call, and potentially make the
+       * stack grow a lot less.
+       */
+              mpi_size_t esize = size - 1; /* even size */
+      mpi_limb_t cy_limb;
+
+      MPN_MUL_N_RECURSE( prodp, up, vp, esize, tspace );
+      cy_limb = _gcry_mpih_addmul_1( prodp + esize, up, esize, vp[esize] );
+      prodp[esize + esize] = cy_limb;
+      cy_limb = _gcry_mpih_addmul_1( prodp + esize, vp, size, up[esize] );
+      prodp[esize + size] = cy_limb;
+    }
+    else {
+        /* Anatolij Alekseevich Karatsuba's divide-and-conquer algorithm.
+         *
+         * Split U in two pieces, U1 and U0, such that
+         * U = U0 + U1*(B**n),
+         * and V in V1 and V0, such that
+         * V = V0 + V1*(B**n).
+         *
+         * UV is then computed recursively using the identity
+         *
+                 *        2n   n          n             n
+         * UV = (B  + B )U V  +  B (U -U )(V -V )  +  (B + 1)U V
+                 *                1 1        1  0   0  1      0 0
+         *
+         * Where B = 2**BITS_PER_MP_LIMB.
+         */
+        mpi_size_t hsize = size >> 1;
+        mpi_limb_t cy;
+        int negflg;
+
+                /* Product H.   ________________  ________________
+                 *        |_____U1 x V1____||____U0 x V0_____|
+         * Put result in upper part of PROD and pass low part of TSPACE
+         * as new TSPACE.
+         */
+        MPN_MUL_N_RECURSE(prodp + size, up + hsize, vp + hsize, hsize, tspace);
+
+                /* Product M.   ________________
+                 *        |_(U1-U0)(V0-V1)_|
+         */
+        if( _gcry_mpih_cmp(up + hsize, up, hsize) >= 0 ) {
+            _gcry_mpih_sub_n(prodp, up + hsize, up, hsize);
+            negflg = 0;
+        }
+        else {
+            _gcry_mpih_sub_n(prodp, up, up + hsize, hsize);
+            negflg = 1;
+        }
+        if( _gcry_mpih_cmp(vp + hsize, vp, hsize) >= 0 ) {
+            _gcry_mpih_sub_n(prodp + hsize, vp + hsize, vp, hsize);
+            negflg ^= 1;
+        }
+        else {
+            _gcry_mpih_sub_n(prodp + hsize, vp, vp + hsize, hsize);
+            /* No change of NEGFLG.  */
+        }
+        /* Read temporary operands from low part of PROD.
+         * Put result in low part of TSPACE using upper part of TSPACE
+         * as new TSPACE.
+         */
+        MPN_MUL_N_RECURSE(tspace, prodp, prodp + hsize, hsize, tspace + size);
+
+        /* Add/copy product H. */
+        MPN_COPY (prodp + hsize, prodp + size, hsize);
+        cy = _gcry_mpih_add_n( prodp + size, prodp + size,
+                            prodp + size + hsize, hsize);
+
+        /* Add product M (if NEGFLG M is a negative number) */
+        if(negflg)
+            cy -= _gcry_mpih_sub_n(prodp + hsize, prodp + hsize, tspace, size);
+        else
+            cy += _gcry_mpih_add_n(prodp + hsize, prodp + hsize, tspace, size);
+
+                /* Product L.   ________________  ________________
+                 *        |________________||____U0 x V0_____|
+         * Read temporary operands from low part of PROD.
+         * Put result in low part of TSPACE using upper part of TSPACE
+         * as new TSPACE.
+         */
+        MPN_MUL_N_RECURSE(tspace, up, vp, hsize, tspace + size);
+
+        /* Add/copy Product L (twice) */
+
+        cy += _gcry_mpih_add_n(prodp + hsize, prodp + hsize, tspace, size);
+        if( cy )
+          _gcry_mpih_add_1(prodp + hsize + size, prodp + hsize + size, hsize, cy);
+
+        MPN_COPY(prodp, tspace, hsize);
+        cy = _gcry_mpih_add_n(prodp + hsize, prodp + hsize, tspace + hsize, hsize);
+        if( cy )
+            _gcry_mpih_add_1(prodp + size, prodp + size, size, 1);
+    }
+}
+
+
+void
+_gcry_mpih_sqr_n_basecase( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size )
+{
+    mpi_size_t i;
+    mpi_limb_t cy_limb;
+    mpi_limb_t v_limb;
+
+    /* Multiply by the first limb in V separately, as the result can be
+     * stored (not added) to PROD.  We also avoid a loop for zeroing.  */
+    v_limb = up[0];
+    if( v_limb <= 1 ) {
+        if( v_limb == 1 )
+            MPN_COPY( prodp, up, size );
+        else
+            MPN_ZERO(prodp, size);
+        cy_limb = 0;
+    }
+    else
+        cy_limb = _gcry_mpih_mul_1( prodp, up, size, v_limb );
+
+    prodp[size] = cy_limb;
+    prodp++;
+
+    /* For each iteration in the outer loop, multiply one limb from
+     * U with one limb from V, and add it to PROD.  */
+    for( i=1; i < size; i++) {
+        v_limb = up[i];
+        if( v_limb <= 1 ) {
+            cy_limb = 0;
+            if( v_limb == 1 )
+                cy_limb = _gcry_mpih_add_n(prodp, prodp, up, size);
+        }
+        else
+            cy_limb = _gcry_mpih_addmul_1(prodp, up, size, v_limb);
+
+        prodp[size] = cy_limb;
+        prodp++;
+    }
+}
+
+
+void
+_gcry_mpih_sqr_n( mpi_ptr_t prodp,
+                  mpi_ptr_t up, mpi_size_t size, mpi_ptr_t tspace)
+{
+    if( size & 1 ) {
+        /* The size is odd, and the code below doesn't handle that.
+         * Multiply the least significant (size - 1) limbs with a recursive
+         * call, and handle the most significant limb of S1 and S2
+         * separately.
+         * A slightly faster way to do this would be to make the Karatsuba
+         * code below behave as if the size were even, and let it check for
+         * odd size in the end.  I.e., in essence move this code to the end.
+         * Doing so would save us a recursive call, and potentially make the
+         * stack grow a lot less.
+         */
+                mpi_size_t esize = size - 1;   /* even size */
+        mpi_limb_t cy_limb;
+
+        MPN_SQR_N_RECURSE( prodp, up, esize, tspace );
+        cy_limb = _gcry_mpih_addmul_1( prodp + esize, up, esize, up[esize] );
+        prodp[esize + esize] = cy_limb;
+        cy_limb = _gcry_mpih_addmul_1( prodp + esize, up, size, up[esize] );
+
+        prodp[esize + size] = cy_limb;
+    }
+    else {
+        mpi_size_t hsize = size >> 1;
+        mpi_limb_t cy;
+
+                /* Product H.   ________________  ________________
+                 *        |_____U1 x U1____||____U0 x U0_____|
+         * Put result in upper part of PROD and pass low part of TSPACE
+         * as new TSPACE.
+         */
+        MPN_SQR_N_RECURSE(prodp + size, up + hsize, hsize, tspace);
+
+                /* Product M.   ________________
+                 *        |_(U1-U0)(U0-U1)_|
+         */
+        if( _gcry_mpih_cmp( up + hsize, up, hsize) >= 0 )
+            _gcry_mpih_sub_n( prodp, up + hsize, up, hsize);
+        else
+            _gcry_mpih_sub_n (prodp, up, up + hsize, hsize);
+
+        /* Read temporary operands from low part of PROD.
+         * Put result in low part of TSPACE using upper part of TSPACE
+         * as new TSPACE.  */
+        MPN_SQR_N_RECURSE(tspace, prodp, hsize, tspace + size);
+
+        /* Add/copy product H  */
+        MPN_COPY(prodp + hsize, prodp + size, hsize);
+        cy = _gcry_mpih_add_n(prodp + size, prodp + size,
+                           prodp + size + hsize, hsize);
+
+        /* Add product M (if NEGFLG M is a negative number).  */
+        cy -= _gcry_mpih_sub_n (prodp + hsize, prodp + hsize, tspace, size);
+
+                /* Product L.   ________________  ________________
+                 *        |________________||____U0 x U0_____|
+         * Read temporary operands from low part of PROD.
+         * Put result in low part of TSPACE using upper part of TSPACE
+         * as new TSPACE.  */
+        MPN_SQR_N_RECURSE (tspace, up, hsize, tspace + size);
+
+                /* Add/copy Product L (twice).*/
+        cy += _gcry_mpih_add_n (prodp + hsize, prodp + hsize, tspace, size);
+        if( cy )
+            _gcry_mpih_add_1(prodp + hsize + size, prodp + hsize + size,
+                                                            hsize, cy);
+
+        MPN_COPY(prodp, tspace, hsize);
+        cy = _gcry_mpih_add_n (prodp + hsize, prodp + hsize, tspace + hsize, hsize);
+        if( cy )
+            _gcry_mpih_add_1 (prodp + size, prodp + size, size, 1);
+    }
+}
+
+
+/* This should be made into an inline function in gmp.h.  */
+void
+_gcry_mpih_mul_n( mpi_ptr_t prodp,
+                     mpi_ptr_t up, mpi_ptr_t vp, mpi_size_t size)
+{
+    int secure;
+
+    if( up == vp ) {
+        if( size < KARATSUBA_THRESHOLD )
+            _gcry_mpih_sqr_n_basecase( prodp, up, size );
+        else {
+            mpi_ptr_t tspace;
+            secure = gcry_is_secure( up );
+            tspace = mpi_alloc_limb_space( 2 * size, secure );
+            _gcry_mpih_sqr_n( prodp, up, size, tspace );
+            _gcry_mpi_free_limb_space (tspace, 2 * size );
+        }
+    }
+    else {
+        if( size < KARATSUBA_THRESHOLD )
+            mul_n_basecase( prodp, up, vp, size );
+        else {
+            mpi_ptr_t tspace;
+            secure = gcry_is_secure( up ) || gcry_is_secure( vp );
+            tspace = mpi_alloc_limb_space( 2 * size, secure );
+            mul_n (prodp, up, vp, size, tspace);
+            _gcry_mpi_free_limb_space (tspace, 2 * size );
+        }
+    }
+}
+
+
+
+void
+_gcry_mpih_mul_karatsuba_case( mpi_ptr_t prodp,
+                                  mpi_ptr_t up, mpi_size_t usize,
+                                  mpi_ptr_t vp, mpi_size_t vsize,
+                                  struct karatsuba_ctx *ctx )
+{
+    mpi_limb_t cy;
+
+    if( !ctx->tspace || ctx->tspace_size < vsize ) {
+        if( ctx->tspace )
+            _gcry_mpi_free_limb_space( ctx->tspace, ctx->tspace_nlimbs );
+        ctx->tspace_nlimbs = 2 * vsize;
+        ctx->tspace = mpi_alloc_limb_space( 2 * vsize,
+                                            (gcry_is_secure( up )
+                                            || gcry_is_secure( vp )) );
+        ctx->tspace_size = vsize;
+    }
+
+    MPN_MUL_N_RECURSE( prodp, up, vp, vsize, ctx->tspace );
+
+    prodp += vsize;
+    up += vsize;
+    usize -= vsize;
+    if( usize >= vsize ) {
+        if( !ctx->tp || ctx->tp_size < vsize ) {
+            if( ctx->tp )
+                _gcry_mpi_free_limb_space( ctx->tp, ctx->tp_nlimbs );
+            ctx->tp_nlimbs = 2 * vsize;
+            ctx->tp = mpi_alloc_limb_space( 2 * vsize, gcry_is_secure( up )
+                                                      || gcry_is_secure( vp ) );
+            ctx->tp_size = vsize;
+        }
+
+        do {
+            MPN_MUL_N_RECURSE( ctx->tp, up, vp, vsize, ctx->tspace );
+            cy = _gcry_mpih_add_n( prodp, prodp, ctx->tp, vsize );
+            _gcry_mpih_add_1( prodp + vsize, ctx->tp + vsize, vsize, cy );
+            prodp += vsize;
+            up += vsize;
+            usize -= vsize;
+        } while( usize >= vsize );
+    }
+
+    if( usize ) {
+        if( usize < KARATSUBA_THRESHOLD ) {
+            _gcry_mpih_mul( ctx->tspace, vp, vsize, up, usize );
+        }
+        else {
+            if( !ctx->next ) {
+                ctx->next = gcry_xcalloc( 1, sizeof *ctx );
+            }
+            _gcry_mpih_mul_karatsuba_case( ctx->tspace,
+                                        vp, vsize,
+                                        up, usize,
+                                        ctx->next );
+        }
+
+        cy = _gcry_mpih_add_n( prodp, prodp, ctx->tspace, vsize);
+        _gcry_mpih_add_1( prodp + vsize, ctx->tspace + vsize, usize, cy );
+    }
+}
+
+
+void
+_gcry_mpih_release_karatsuba_ctx( struct karatsuba_ctx *ctx )
+{
+    struct karatsuba_ctx *ctx2;
+
+    if( ctx->tp )
+        _gcry_mpi_free_limb_space( ctx->tp, ctx->tp_nlimbs );
+    if( ctx->tspace )
+        _gcry_mpi_free_limb_space( ctx->tspace, ctx->tspace_nlimbs );
+    for( ctx=ctx->next; ctx; ctx = ctx2 ) {
+        ctx2 = ctx->next;
+        if( ctx->tp )
+            _gcry_mpi_free_limb_space( ctx->tp, ctx->tp_nlimbs );
+        if( ctx->tspace )
+            _gcry_mpi_free_limb_space( ctx->tspace, ctx->tspace_nlimbs );
+        gcry_free( ctx );
+    }
+}
+
+/* Multiply the natural numbers u (pointed to by UP, with USIZE limbs)
+ * and v (pointed to by VP, with VSIZE limbs), and store the result at
+ * PRODP.  USIZE + VSIZE limbs are always stored, but if the input
+ * operands are normalized.  Return the most significant limb of the
+ * result.
+ *
+ * NOTE: The space pointed to by PRODP is overwritten before finished
+ * with U and V, so overlap is an error.
+ *
+ * Argument constraints:
+ * 1. USIZE >= VSIZE.
+ * 2. PRODP != UP and PRODP != VP, i.e. the destination
+ *    must be distinct from the multiplier and the multiplicand.
+ */
+
+mpi_limb_t
+_gcry_mpih_mul( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
+                   mpi_ptr_t vp, mpi_size_t vsize)
+{
+    mpi_ptr_t prod_endp = prodp + usize + vsize - 1;
+    mpi_limb_t cy;
+    struct karatsuba_ctx ctx;
+
+    if( vsize < KARATSUBA_THRESHOLD ) {
+        mpi_size_t i;
+        mpi_limb_t v_limb;
+
+        if( !vsize )
+            return 0;
+
+        /* Multiply by the first limb in V separately, as the result can be
+                 * stored (not added) to PROD.We also avoid a loop for zeroing.  */
+        v_limb = vp[0];
+        if( v_limb <= 1 ) {
+            if( v_limb == 1 )
+                MPN_COPY( prodp, up, usize );
+            else
+                MPN_ZERO( prodp, usize );
+            cy = 0;
+        }
+        else
+            cy = _gcry_mpih_mul_1( prodp, up, usize, v_limb );
+
+        prodp[usize] = cy;
+        prodp++;
+
+        /* For each iteration in the outer loop, multiply one limb from
+                 * U with one limb from V, and add it to PROD.*/
+        for( i = 1; i < vsize; i++ ) {
+            v_limb = vp[i];
+            if( v_limb <= 1 ) {
+                cy = 0;
+                if( v_limb == 1 )
+                   cy = _gcry_mpih_add_n(prodp, prodp, up, usize);
+            }
+            else
+                cy = _gcry_mpih_addmul_1(prodp, up, usize, v_limb);
+
+            prodp[usize] = cy;
+            prodp++;
+        }
+
+        return cy;
+    }
+
+    memset( &ctx, 0, sizeof ctx );
+    _gcry_mpih_mul_karatsuba_case( prodp, up, usize, vp, vsize, &ctx );
+    _gcry_mpih_release_karatsuba_ctx( &ctx );
+    return *prod_endp;
+}
+
+