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lib/mpi: Extend the MPI library

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Expand the mpi library based on libgcrypt, and the ECC algorithm of
mpi based on libgcrypt requires these functions.
Some other algorithms will be developed based on mpi ecc, such as SM2.

Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Tested-by: Xufeng Zhang <yunbo.xufeng@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tianjia Zhang
2020-09-21 00:20:55 +08:00
committed by Herbert Xu
parent f49282870f
commit a8ea8bdd9d
14 changed files with 2076 additions and 10 deletions
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46
lib/mpi/mpi-cmp.c
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@@ -41,28 +41,54 @@ int mpi_cmp_ui(MPI u, unsigned long v)
}
EXPORT_SYMBOL_GPL(mpi_cmp_ui);
int mpi_cmp(MPI u, MPI v)
static int do_mpi_cmp(MPI u, MPI v, int absmode)
{
mpi_size_t usize, vsize;
mpi_size_t usize;
mpi_size_t vsize;
int usign;
int vsign;
int cmp;
mpi_normalize(u);
mpi_normalize(v);
usize = u->nlimbs;
vsize = v->nlimbs;
if (!u->sign && v->sign)
usign = absmode ? 0 : u->sign;
vsign = absmode ? 0 : v->sign;
/* Compare sign bits. */
if (!usign && vsign)
return 1;
if (u->sign && !v->sign)
if (usign && !vsign)
return -1;
if (usize != vsize && !u->sign && !v->sign)
/* U and V are either both positive or both negative. */
if (usize != vsize && !usign && !vsign)
return usize - vsize;
if (usize != vsize && u->sign && v->sign)
return vsize - usize;
if (usize != vsize && usign && vsign)
return vsize + usize;
if (!usize)
return 0;
cmp = mpihelp_cmp(u->d, v->d, usize);
if (u->sign)
return -cmp;
return cmp;
if (!cmp)
return 0;
if ((cmp < 0?1:0) == (usign?1:0))
return 1;
return -1;
}
int mpi_cmp(MPI u, MPI v)
{
return do_mpi_cmp(u, v, 0);
}
EXPORT_SYMBOL_GPL(mpi_cmp);
int mpi_cmpabs(MPI u, MPI v)
{
return do_mpi_cmp(u, v, 1);
}
EXPORT_SYMBOL_GPL(mpi_cmpabs);