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making the parsing of parameters of a subjectAlgorithmIdentifier optional

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This commit is contained in:
Tobias Brunner
2008-06-10 07:36:44 +00:00
parent 208b3baf10
commit 468d45e68b
1 changed files with 18 additions and 2 deletions
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src/libstrongswan/asn1/asn1.c
+18 -2
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@@ -456,6 +456,14 @@ static const asn1Object_t algorithmIdentifierObjects[] = {
{ 1, "parameters", ASN1_EOC, ASN1_RAW }, /* 2 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
/* parameters are optional in case of ecdsa-with-SHA1 as algorithm (RFC 3279) */
static const asn1Object_t algorithmIdentifierObjectsOptional[] = {
{ 0, "algorithmIdentifier", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "algorithm", ASN1_OID, ASN1_BODY }, /* 1 */
{ 1, "parameters", ASN1_EOC, ASN1_RAW|ASN1_OPT }, /* 2 */
{ 1, "end opt", ASN1_EOC, ASN1_END }, /* 3 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define ALGORITHM_ID_ALG 1
#define ALGORITHM_ID_PARAMETERS 2
@@ -468,8 +476,14 @@ int asn1_parse_algorithmIdentifier(chunk_t blob, int level0, chunk_t *parameters
chunk_t object;
int objectID;
int alg = OID_UNKNOWN;
const asn1Object_t *objects = algorithmIdentifierObjectsOptional;
parser = asn1_parser_create(algorithmIdentifierObjects, blob);
if (parameters != NULL)
{
objects = algorithmIdentifierObjects;
}
parser = asn1_parser_create(objects, blob);
parser->set_top_level(parser, level0);
while (parser->iterate(parser, &objectID, &object))
@@ -481,7 +495,9 @@ int asn1_parse_algorithmIdentifier(chunk_t blob, int level0, chunk_t *parameters
break;
case ALGORITHM_ID_PARAMETERS:
if (parameters != NULL)
{
*parameters = object;
}
break;
default:
break;
@@ -489,7 +505,7 @@ int asn1_parse_algorithmIdentifier(chunk_t blob, int level0, chunk_t *parameters
}
parser->destroy(parser);
return alg;
}
}
/*
* tests if a blob contains a valid ASN.1 set or sequence