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der flexi decoder: implement decoding of context-specific data

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This commit is contained in:
Steffen Jaeckel 2014-10-06 18:41:01 +02:00
parent 2d8933e4f1
commit 6bd6319fb0
1 changed files with 20 additions and 0 deletions
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20
src/pk/asn1/der/sequence/der_decode_sequence_flexi.c
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@ -108,6 +108,12 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
/* treat constructed elements like SETs */
type = 0x20;
}
else if ((type & 0xC0) == 0x80) {
/* context-specific, use the 'used' field to store the original identifier */
l->used = type;
/* context-specific elements are treated as opaque data */
type = 0x80;
}
/* now switch on type */
switch (type) {
@ -359,6 +365,20 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
l->child->parent = l;
break;
case 0x80: /* Context-specific */
l->type = LTC_ASN1_CONTEXT_SPECIFIC;
if ((l->data = XCALLOC(1, len - data_offset)) == NULL) {
err = CRYPT_MEM;
goto error;
}
XMEMCPY(l->data, in + data_offset, len - data_offset);
l->size = len - data_offset;
break;
default:
/* invalid byte ... this is a soft error */
/* remove link */