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intermediate check in

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This commit is contained in:
Werner Koch 1998-08-05 16:51:59 +00:00
parent 6fbee8ab86
commit 9b609091ab
38 changed files with 812 additions and 180 deletions
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44
mpi/mpicoder.c
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@ -123,6 +123,50 @@ mpi_read(IOBUF inp, unsigned *ret_nread, int secure)
}
MPI
mpi_read_from_buffer(byte *buffer, unsigned *ret_nread, int secure)
{
int i, j;
unsigned nbits, nbytes, nlimbs, nread=0;
mpi_limb_t a;
MPI val = MPI_NULL;
if( *ret_nread < 2 )
goto leave;
nbits = buffer[0] << 8 | buffer[1];
if( nbits > MAX_EXTERN_MPI_BITS ) {
log_error("mpi too large (%u bits)\n", nbits);
goto leave;
}
buffer += 2;
nread = 2;
nbytes = (nbits+7) / 8;
nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
val = secure? mpi_alloc_secure( nlimbs )
: mpi_alloc( nlimbs );
i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
i %= BYTES_PER_MPI_LIMB;
val->nbits = nbits;
j= val->nlimbs = nlimbs;
val->sign = 0;
for( ; j > 0; j-- ) {
a = 0;
for(; i < BYTES_PER_MPI_LIMB; i++ ) {
if( ++nread > *ret_nread )
log_bug("mpi larger than buffer");
a <<= 8;
a |= *buffer++;
}
i = 0;
val->d[j-1] = a;
}
leave:
*ret_nread = nread;
return val;
}
/****************
* Make an mpi from a character string.