Improve mbedtls_asn1_write_int to support values >255
mbedtls_asn1_write_int had an undocumented restriction to values that
fit in a single octet. Fix this.
Negative integers are still not supported.
diff --git a/library/asn1write.c b/library/asn1write.c
index b54e26b..98c6766 100644
--- a/library/asn1write.c
+++ b/library/asn1write.c
@@ -236,17 +236,20 @@
int ret;
size_t len = 0;
- if( *p - start < 1 )
- return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
-
- len += 1;
- *--(*p) = val;
-
- if( val > 0 && **p & 0x80 )
+ do
{
if( *p - start < 1 )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+ len += 1;
+ *--(*p) = val & 0xff;
+ val >>= 8;
+ }
+ while( val > 0 );
+ if( **p & 0x80 )
+ {
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
*--(*p) = 0x00;
len += 1;
}