111 lines
2 KiB
C
111 lines
2 KiB
C
/*
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* sha1sum - compute SHA1 or SHA2 digest
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*/
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#include <u.h>
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#include <libc.h>
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#include <libsec.h>
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#pragma varargck type "M" uchar*
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static char exitstr[ERRMAX];
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typedef struct Sha2 Sha2;
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struct Sha2 {
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int bits;
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int dlen;
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DigestState* (*func)(uchar *, ulong, uchar *, DigestState *);
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};
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static Sha2 sha2s[] = {
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224, SHA2_224dlen, sha2_224,
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256, SHA2_256dlen, sha2_256,
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384, SHA2_384dlen, sha2_384,
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512, SHA2_512dlen, sha2_512,
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};
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static DigestState* (*shafunc)(uchar *, ulong, uchar *, DigestState *);
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static int shadlen;
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static int
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digestfmt(Fmt *fmt)
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{
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char buf[SHA2_512dlen*2 + 1];
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uchar *p;
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int i;
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p = va_arg(fmt->args, uchar*);
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for(i = 0; i < shadlen; i++)
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sprint(buf + 2*i, "%.2ux", p[i]);
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return fmtstrcpy(fmt, buf);
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}
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static void
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sum(int fd, char *name)
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{
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int n;
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uchar buf[8192], digest[SHA2_512dlen];
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DigestState *s;
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s = (*shafunc)(nil, 0, nil, nil);
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while((n = read(fd, buf, sizeof buf)) > 0)
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(*shafunc)(buf, n, nil, s);
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if(n < 0){
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snprint(exitstr, sizeof(exitstr), "reading %s: %r\n", name? name: "stdin");
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fprint(2, "%s", exitstr);
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return;
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}
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(*shafunc)(nil, 0, digest, s);
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if(name == nil)
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print("%M\n", digest);
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else
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print("%M\t%s\n", digest, name);
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}
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static void
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usage(void)
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{
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fprint(2, "usage: %s [-2 bits] [file...]\n", argv0);
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exits("usage");
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}
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void
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main(int argc, char *argv[])
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{
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int i, fd, bits;
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Sha2 *sha;
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shafunc = sha1;
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shadlen = SHA1dlen;
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ARGBEGIN{
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case '2':
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bits = atoi(EARGF(usage()));
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for (sha = sha2s; sha < sha2s + nelem(sha2s); sha++)
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if (sha->bits == bits)
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break;
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if (sha >= sha2s + nelem(sha2s))
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sysfatal("unknown number of sha2 bits: %d", bits);
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shafunc = sha->func;
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shadlen = sha->dlen;
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break;
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default:
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usage();
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}ARGEND
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fmtinstall('M', digestfmt);
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if(argc == 0)
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sum(0, nil);
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else
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for(i = 0; i < argc; i++){
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fd = open(argv[i], OREAD);
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if(fd < 0){
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snprint(exitstr, sizeof(exitstr), "can't open %s: %r", argv[i]);
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fprint(2, "%s: %s\n", argv0, exitstr);
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continue;
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}
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sum(fd, argv[i]);
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close(fd);
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}
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exits(exitstr);
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}
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