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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <libsec.h>
static int
digestfmt(Fmt *fmt)
{
char buf[SHA1dlen*2+1];
uchar *p;
int i;
p = va_arg(fmt->args, uchar*);
for(i=0; i<SHA1dlen; i++)
sprint(buf+2*i, "%.2ux", p[i]);
return fmtstrcpy(fmt, buf);
}
static void
sum(int fd, char *name)
{
int n;
uchar buf[8192], digest[SHA1dlen];
DigestState *s;
s = sha1(nil, 0, nil, nil);
while((n = read(fd, buf, sizeof buf)) > 0)
sha1(buf, n, nil, s);
sha1(nil, 0, digest, s);
if(name == nil)
print("%M\n", digest);
else
print("%M\t%s\n", digest, name);
}
void
main(int argc, char *argv[])
{
int i, fd;
ARGBEGIN{
default:
fprint(2, "usage: sha1sum [file...]\n");
exits("usage");
}ARGEND
fmtinstall('M', digestfmt);
if(argc == 0)
sum(0, nil);
else for(i = 0; i < argc; i++){
fd = open(argv[i], OREAD);
if(fd < 0){
fprint(2, "sha1sum: can't open %s: %r\n", argv[i]);
continue;
}
sum(fd, argv[i]);
close(fd);
}
exits(nil);
}
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