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asn1: fixed parsing "end of content" 

fixes #190
This commit is contained in:
Frank Morgner 2015-07-28 09:10:54 +02:00
parent 7eb62a0898
commit b44c98e4d8
1 changed files with 4 additions and 1 deletions
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5
src/libopensc/asn1.c
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@ -67,9 +67,12 @@ int sc_asn1_read_tag(const u8 ** buf, size_t buflen, unsigned int *cla_out,
if (left < 2)
return SC_ERROR_INVALID_ASN1_OBJECT;
*buf = NULL;
if (*p == 0xff || *p == 0)
if (*p == 0xff || *p == 0) {
/* end of data reached */
*taglen = 0;
*tag_out = SC_ASN1_TAG_EOC;
return SC_SUCCESS;
}
/* parse tag byte(s) */
cla = (*p & SC_ASN1_TAG_CLASS) | (*p & SC_ASN1_TAG_CONSTRUCTED);
tag = *p & SC_ASN1_TAG_PRIMITIVE;