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Made asn1_get_alg() and asn1_get_alg_null() as generic functions

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A generic function for retrieving the AlgorithmIdentifier structure with
its parameters and adapted X509, PKCS#5 and PKCS#12 to use them.
This commit is contained in:
Paul Bakker
2013-06-29 12:16:17 +02:00
parent ce6ae233cb
commit f8d018a274
6 changed files with 127 additions and 117 deletions
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61
library/asn1parse.c
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@ -1,7 +1,7 @@
/*
* Generic ASN.1 parsing
*
* Copyright (C) 2006-2011, Brainspark B.V.
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
@ -257,4 +257,63 @@ int asn1_get_sequence_of( unsigned char **p,
return( 0 );
}
int asn1_get_alg( unsigned char **p,
const unsigned char *end,
asn1_buf *alg, asn1_buf *params )
{
int ret;
size_t len;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( ret );
end = *p + len;
alg->tag = **p;
if( ( ret = asn1_get_tag( p, end, &alg->len, ASN1_OID ) ) != 0 )
return( ret );
alg->p = *p;
*p += alg->len;
if( *p == end )
{
memset( params, 0, sizeof(asn1_buf) );
return( 0 );
}
params->tag = **p;
(*p)++;
if( ( ret = asn1_get_len( p, end, &params->len ) ) != 0 )
return( ret );
params->p = *p;
*p += params->len;
if( *p != end )
return( POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
int asn1_get_alg_null( unsigned char **p,
const unsigned char *end,
asn1_buf *alg )
{
int ret;
asn1_buf params;
memset( &params, 0, sizeof(asn1_buf) );
if( ( ret = asn1_get_alg( p, end, alg, &params ) ) != 0 )
return( ret );
if( ( params.tag != ASN1_NULL && params.tag != 0 ) || params.len != 0 )
return( POLARSSL_ERR_ASN1_INVALID_DATA );
return( 0 );
}
#endif