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

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#include <u.h>
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#include <libc.h>
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#include <mp.h>
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#include <libsec.h>
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#define STRLEN(s)	(sizeof(s)-1)
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uchar*
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decodePEM(char *s, char *type, int *len, char **new_s)
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{
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	uchar *d;
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	char *t, *e, *tt;
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	int n;
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	*len = 0;
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	/*
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	 * find the correct section of the file, stripping garbage at the beginning and end.
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	 * the data is delimited by -----BEGIN <type>-----\n and -----END <type>-----\n
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	 */
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	n = strlen(type);
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	e = strchr(s, '\0');
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	for(t = s; t != nil && t < e; ){
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		tt = t;
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		t = strchr(tt, '\n');
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		if(t != nil)
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			t++;
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		if(strncmp(tt, "-----BEGIN ", STRLEN("-----BEGIN ")) == 0
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		&& strncmp(&tt[STRLEN("-----BEGIN ")], type, n) == 0
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		&& strncmp(&tt[STRLEN("-----BEGIN ")+n], "-----\n", STRLEN("-----\n")) == 0)
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			break;
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	}
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	for(tt = t; tt != nil && tt < e; tt++){
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		if(strncmp(tt, "-----END ", STRLEN("-----END ")) == 0
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		&& strncmp(&tt[STRLEN("-----END ")], type, n) == 0
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		&& strncmp(&tt[STRLEN("-----END ")+n], "-----\n", STRLEN("-----\n")) == 0)
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			break;
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		tt = strchr(tt, '\n');
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		if(tt == nil)
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			break;
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	}
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	if(tt == nil || tt == e){
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		werrstr("incorrect .pem file format: bad header or trailer");
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		return nil;
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	}
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	if(new_s)
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		*new_s = tt+1;
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	n = ((tt - t) * 6 + 7) / 8;
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	d = malloc(n);
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	if(d == nil){
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		werrstr("out of memory");
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		return nil;
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	}
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	n = dec64(d, n, t, tt - t);
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	if(n < 0){
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		free(d);
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		werrstr("incorrect .pem file format: bad base64 encoded data");
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		return nil;
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	}
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	*len = n;
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	return d;
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}
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PEMChain*
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decodepemchain(char *s, char *type)
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{
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	PEMChain *first = nil, *last = nil, *chp;
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	uchar *d;
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	char *e;
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	int n;
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	e = strchr(s, '\0');
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	while (s < e) {
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		d = decodePEM(s, type, &n, &s);
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		if(d == nil)
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			break;
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		chp = malloc(sizeof(PEMChain));
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		chp->next = nil;
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		chp->pem = d;
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		chp->pemlen = n;
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		if (first == nil)
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			first = chp;
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		else
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			last->next = chp;
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		last = chp;
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	}
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	return first;
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}