crypto: lib - Move mpi into lib/crypto

As lib/mpi is mostly used by crypto code, move it under lib/crypto
so that patches touching it get directed to the right mailing list.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 314 deletions

diff --git a/lib/mpi/mpi-pow.c b/lib/mpi/mpi-pow.c
deleted file mode 100644
index 2fd7a46d55ec..000000000000
--- a/lib/mpi/mpi-pow.c
+++ /dev/null
@@ -1,314 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* mpi-pow.c  -  MPI functions
- *	Copyright (C) 1994, 1996, 1998, 2000 Free Software Foundation, Inc.
- *
- * This file is part of GnuPG.
- *
- * 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.
- *	 The GNU MP Library itself is published under the LGPL;
- *	 however I decided to publish this code under the plain GPL.
- */
-
-#include <linux/sched.h>
-#include <linux/string.h>
-#include "mpi-internal.h"
-#include "longlong.h"
-
-/****************
- * RES = BASE ^ EXP mod MOD
- */
-int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
-{
-	mpi_ptr_t mp_marker = NULL, bp_marker = NULL, ep_marker = NULL;
-	struct karatsuba_ctx karactx = {};
-	mpi_ptr_t xp_marker = NULL;
-	mpi_ptr_t tspace = NULL;
-	mpi_ptr_t rp, ep, mp, bp;
-	mpi_size_t esize, msize, bsize, rsize;
-	int msign, bsign, rsign;
-	mpi_size_t size;
-	int mod_shift_cnt;
-	int negative_result;
-	int assign_rp = 0;
-	mpi_size_t tsize = 0;	/* to avoid compiler warning */
-	/* fixme: we should check that the warning is void */
-	int rc = -ENOMEM;
-
-	esize = exp->nlimbs;
-	msize = mod->nlimbs;
-	size = 2 * msize;
-	msign = mod->sign;
-
-	rp = res->d;
-	ep = exp->d;
-
-	if (!msize)
-		return -EINVAL;
-
-	if (!esize) {
-		/* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0
-		 * depending on if MOD equals 1.  */
-		res->nlimbs = (msize == 1 && mod->d[0] == 1) ? 0 : 1;
-		if (res->nlimbs) {
-			if (mpi_resize(res, 1) < 0)
-				goto enomem;
-			rp = res->d;
-			rp[0] = 1;
-		}
-		res->sign = 0;
-		goto leave;
-	}
-
-	/* Normalize MOD (i.e. make its most significant bit set) as required by
-	 * mpn_divrem.  This will make the intermediate values in the calculation
-	 * slightly larger, but the correct result is obtained after a final
-	 * reduction using the original MOD value.  */
-	mp = mp_marker = mpi_alloc_limb_space(msize);
-	if (!mp)
-		goto enomem;
-	mod_shift_cnt = count_leading_zeros(mod->d[msize - 1]);
-	if (mod_shift_cnt)
-		mpihelp_lshift(mp, mod->d, msize, mod_shift_cnt);
-	else
-		MPN_COPY(mp, mod->d, msize);
-
-	bsize = base->nlimbs;
-	bsign = base->sign;
-	if (bsize > msize) {	/* The base is larger than the module. Reduce it. */
-		/* Allocate (BSIZE + 1) with space for remainder and quotient.
-		 * (The quotient is (bsize - msize + 1) limbs.)  */
-		bp = bp_marker = mpi_alloc_limb_space(bsize + 1);
-		if (!bp)
-			goto enomem;
-		MPN_COPY(bp, base->d, bsize);
-		/* We don't care about the quotient, store it above the remainder,
-		 * at BP + MSIZE.  */
-		mpihelp_divrem(bp + msize, 0, bp, bsize, mp, msize);
-		bsize = msize;
-		/* Canonicalize the base, since we are going to multiply with it
-		 * quite a few times.  */
-		MPN_NORMALIZE(bp, bsize);
-	} else
-		bp = base->d;
-
-	if (!bsize) {
-		res->nlimbs = 0;
-		res->sign = 0;
-		goto leave;
-	}
-
-	if (res->alloced < size) {
-		/* We have to allocate more space for RES.  If any of the input
-		 * parameters are identical to RES, defer deallocation of the old
-		 * space.  */
-		if (rp == ep || rp == mp || rp == bp) {
-			rp = mpi_alloc_limb_space(size);
-			if (!rp)
-				goto enomem;
-			assign_rp = 1;
-		} else {
-			if (mpi_resize(res, size) < 0)
-				goto enomem;
-			rp = res->d;
-		}
-	} else {		/* Make BASE, EXP and MOD not overlap with RES.  */
-		if (rp == bp) {
-			/* RES and BASE are identical.  Allocate temp. space for BASE.  */
-			BUG_ON(bp_marker);
-			bp = bp_marker = mpi_alloc_limb_space(bsize);
-			if (!bp)
-				goto enomem;
-			MPN_COPY(bp, rp, bsize);
-		}
-		if (rp == ep) {
-			/* RES and EXP are identical.  Allocate temp. space for EXP.  */
-			ep = ep_marker = mpi_alloc_limb_space(esize);
-			if (!ep)
-				goto enomem;
-			MPN_COPY(ep, rp, esize);
-		}
-		if (rp == mp) {
-			/* RES and MOD are identical.  Allocate temporary space for MOD. */
-			BUG_ON(mp_marker);
-			mp = mp_marker = mpi_alloc_limb_space(msize);
-			if (!mp)
-				goto enomem;
-			MPN_COPY(mp, rp, msize);
-		}
-	}
-
-	MPN_COPY(rp, bp, bsize);
-	rsize = bsize;
-	rsign = bsign;
-
-	{
-		mpi_size_t i;
-		mpi_ptr_t xp;
-		int c;
-		mpi_limb_t e;
-		mpi_limb_t carry_limb;
-
-		xp = xp_marker = mpi_alloc_limb_space(2 * (msize + 1));
-		if (!xp)
-			goto enomem;
-
-		negative_result = (ep[0] & 1) && base->sign;
-
-		i = esize - 1;
-		e = ep[i];
-		c = count_leading_zeros(e);
-		e = (e << c) << 1;	/* shift the exp bits to the left, lose msb */
-		c = BITS_PER_MPI_LIMB - 1 - c;
-
-		/* Main loop.
-		 *
-		 * Make the result be pointed to alternately by XP and RP.  This
-		 * helps us avoid block copying, which would otherwise be necessary
-		 * with the overlap restrictions of mpihelp_divmod. With 50% probability
-		 * the result after this loop will be in the area originally pointed
-		 * by RP (==RES->d), and with 50% probability in the area originally
-		 * pointed to by XP.
-		 */
-
-		for (;;) {
-			while (c) {
-				mpi_ptr_t tp;
-				mpi_size_t xsize;
-
-				/*if (mpihelp_mul_n(xp, rp, rp, rsize) < 0) goto enomem */
-				if (rsize < KARATSUBA_THRESHOLD)
-					mpih_sqr_n_basecase(xp, rp, rsize);
-				else {
-					if (!tspace) {
-						tsize = 2 * rsize;
-						tspace =
-						    mpi_alloc_limb_space(tsize);
-						if (!tspace)
-							goto enomem;
-					} else if (tsize < (2 * rsize)) {
-						mpi_free_limb_space(tspace);
-						tsize = 2 * rsize;
-						tspace =
-						    mpi_alloc_limb_space(tsize);
-						if (!tspace)
-							goto enomem;
-					}
-					mpih_sqr_n(xp, rp, rsize, tspace);
-				}
-
-				xsize = 2 * rsize;
-				if (xsize > msize) {
-					mpihelp_divrem(xp + msize, 0, xp, xsize,
-						       mp, msize);
-					xsize = msize;
-				}
-
-				tp = rp;
-				rp = xp;
-				xp = tp;
-				rsize = xsize;
-
-				if ((mpi_limb_signed_t) e < 0) {
-					/*mpihelp_mul( xp, rp, rsize, bp, bsize ); */
-					if (bsize < KARATSUBA_THRESHOLD) {
-						mpi_limb_t tmp;
-						if (mpihelp_mul
-						    (xp, rp, rsize, bp, bsize,
-						     &tmp) < 0)
-							goto enomem;
-					} else {
-						if (mpihelp_mul_karatsuba_case
-						    (xp, rp, rsize, bp, bsize,
-						     &karactx) < 0)
-							goto enomem;
-					}
-
-					xsize = rsize + bsize;
-					if (xsize > msize) {
-						mpihelp_divrem(xp + msize, 0,
-							       xp, xsize, mp,
-							       msize);
-						xsize = msize;
-					}
-
-					tp = rp;
-					rp = xp;
-					xp = tp;
-					rsize = xsize;
-				}
-				e <<= 1;
-				c--;
-				cond_resched();
-			}
-
-			i--;
-			if (i < 0)
-				break;
-			e = ep[i];
-			c = BITS_PER_MPI_LIMB;
-		}
-
-		/* We shifted MOD, the modulo reduction argument, left MOD_SHIFT_CNT
-		 * steps.  Adjust the result by reducing it with the original MOD.
-		 *
-		 * Also make sure the result is put in RES->d (where it already
-		 * might be, see above).
-		 */
-		if (mod_shift_cnt) {
-			carry_limb =
-			    mpihelp_lshift(res->d, rp, rsize, mod_shift_cnt);
-			rp = res->d;
-			if (carry_limb) {
-				rp[rsize] = carry_limb;
-				rsize++;
-			}
-		} else {
-			MPN_COPY(res->d, rp, rsize);
-			rp = res->d;
-		}
-
-		if (rsize >= msize) {
-			mpihelp_divrem(rp + msize, 0, rp, rsize, mp, msize);
-			rsize = msize;
-		}
-
-		/* Remove any leading zero words from the result.  */
-		if (mod_shift_cnt)
-			mpihelp_rshift(rp, rp, rsize, mod_shift_cnt);
-		MPN_NORMALIZE(rp, rsize);
-	}
-
-	if (negative_result && rsize) {
-		if (mod_shift_cnt)
-			mpihelp_rshift(mp, mp, msize, mod_shift_cnt);
-		mpihelp_sub(rp, mp, msize, rp, rsize);
-		rsize = msize;
-		rsign = msign;
-		MPN_NORMALIZE(rp, rsize);
-	}
-	res->nlimbs = rsize;
-	res->sign = rsign;
-
-leave:
-	rc = 0;
-enomem:
-	mpihelp_release_karatsuba_ctx(&karactx);
-	if (assign_rp)
-		mpi_assign_limb_space(res, rp, size);
-	if (mp_marker)
-		mpi_free_limb_space(mp_marker);
-	if (bp_marker)
-		mpi_free_limb_space(bp_marker);
-	if (ep_marker)
-		mpi_free_limb_space(ep_marker);
-	if (xp_marker)
-		mpi_free_limb_space(xp_marker);
-	if (tspace)
-		mpi_free_limb_space(tspace);
-	return rc;
-}
-EXPORT_SYMBOL_GPL(mpi_powm);