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Add ASN.1 ENUMERATED tag support

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Add ASN.1 ENUMERATED [1] tag to supported tag list.

1. https://tools.ietf.org/html/rfc3641#page-8

Signed-off-by: Mykhailo Sopiha <mykhailo.sopiha@linaro.org>
This commit is contained in:
Mykhailo Sopiha
2019-10-29 15:58:10 +02:00
parent 0eaf49c9be
commit 20180ca919
4 changed files with 71 additions and 11 deletions
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27
library/asn1parse.c
View File

@ -139,17 +139,20 @@ int mbedtls_asn1_get_bool( unsigned char **p,
return( 0 );
}
int mbedtls_asn1_get_int( unsigned char **p,
const unsigned char *end,
int *val )
static int asn1_get_tagged_int( unsigned char **p,
const unsigned char *end,
int tag, int *val )
{
int ret;
size_t len;
if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
if( ( ret = mbedtls_asn1_get_tag( p, end, &len, tag ) ) != 0 )
return( ret );
/* len==0 is malformed (0 must be represented as 020100). */
/*
* len==0 is malformed (0 must be represented as 020100 for INTEGER,
* or 0A0100 for ENUMERATED tags
*/
if( len == 0 )
return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
/* This is a cryptography library. Reject negative integers. */
@ -180,6 +183,20 @@ int mbedtls_asn1_get_int( unsigned char **p,
return( 0 );
}
int mbedtls_asn1_get_int( unsigned char **p,
const unsigned char *end,
int *val )
{
return( asn1_get_tagged_int( p, end, MBEDTLS_ASN1_INTEGER, val) );
}
int mbedtls_asn1_get_enum( unsigned char **p,
const unsigned char *end,
int *val )
{
return( asn1_get_tagged_int( p, end, MBEDTLS_ASN1_ENUMERATED, val) );
}
#if defined(MBEDTLS_BIGNUM_C)
int mbedtls_asn1_get_mpi( unsigned char **p,
const unsigned char *end,

14
library/asn1write.c
View File

@ -231,7 +231,7 @@ int mbedtls_asn1_write_bool( unsigned char **p, unsigned char *start, int boolea
return( (int) len );
}
int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val )
static int asn1_write_tagged_int( unsigned char **p, unsigned char *start, int val, int tag )
{
int ret;
size_t len = 0;
@ -255,11 +255,21 @@ int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val )
}
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_INTEGER ) );
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, tag ) );
return( (int) len );
}
int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val )
{
return( asn1_write_tagged_int( p, start, val, MBEDTLS_ASN1_INTEGER ) );
}
int mbedtls_asn1_write_enum( unsigned char **p, unsigned char *start, int val )
{
return( asn1_write_tagged_int( p, start, val, MBEDTLS_ASN1_ENUMERATED ) );
}
int mbedtls_asn1_write_tagged_string( unsigned char **p, unsigned char *start, int tag,
const char *text, size_t text_len )
{