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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libsec/port/thumb.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <auth.h>
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#include <mp.h>
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#include <libsec.h>
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enum{ ThumbTab = 1<<10 };
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static void *
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emalloc(int n)
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{
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	void *p;
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	if(n==0)
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		n=1;
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	p = malloc(n);
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	if(p == nil){
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		exits("out of memory");
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	}
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	memset(p, 0, n);
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	return p;
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}
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void
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freeThumbprints(Thumbprint *table)
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{
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	Thumbprint *hd, *p, *q;
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	for(hd = table; hd < table+ThumbTab; hd++){
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		for(p = hd->next; p; p = q){
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			q = p->next;
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			free(p);
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		}
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	}
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	free(table);
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}
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int
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okThumbprint(uchar *sum, Thumbprint *table)
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{
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	Thumbprint *p;
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	int i = ((sum[0]<<8) + sum[1]) & (ThumbTab-1);
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	for(p = table[i].next; p; p = p->next)
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		if(memcmp(sum, p->sha1, SHA1dlen) == 0)
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			return 1;
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	return 0;
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}
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static void
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loadThumbprints(char *file, Thumbprint *table, Thumbprint *crltab)
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{
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	Thumbprint *entry;
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	Biobuf *bin;
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	char *line, *field[50];
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	uchar sum[SHA1dlen];
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	int i;
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	bin = Bopen(file, OREAD);
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	if(bin == nil)
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		return;
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	for(; (line = Brdstr(bin, '\n', 1)) != 0; free(line)){
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		if(tokenize(line, field, nelem(field)) < 2)
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			continue;
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		if(strcmp(field[0], "#include") == 0){
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			loadThumbprints(field[1], table, crltab);
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			continue;
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		}
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		if(strcmp(field[0], "x509") != 0 || strncmp(field[1], "sha1=", strlen("sha1=")) != 0)
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			continue;
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		field[1] += strlen("sha1=");
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		dec16(sum, sizeof(sum), field[1], strlen(field[1]));
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		if(crltab && okThumbprint(sum, crltab))
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			continue;
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		entry = (Thumbprint*)emalloc(sizeof(*entry));
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		memcpy(entry->sha1, sum, SHA1dlen);
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		i = ((sum[0]<<8) + sum[1]) & (ThumbTab-1);
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		entry->next = table[i].next;
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		table[i].next = entry;
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	}
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	Bterm(bin);
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}
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Thumbprint *
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initThumbprints(char *ok, char *crl)
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{
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	Thumbprint *table, *crltab = nil;
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	if(crl){
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		crltab = emalloc(ThumbTab * sizeof(*table));
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		loadThumbprints(crl, crltab, nil);
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	}
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	table = emalloc(ThumbTab * sizeof(*table));
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	loadThumbprints(ok, table, crltab);
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	free(crltab);
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	return table;
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}
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