lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-08-01 10:06:53 +03:00
Code Activity

PK parse/write: support keylen=0 correctly

Browse Source 
A 0-length buffer for the key is a legitimate edge case. Ensure that
it works, even with buf=NULL. Document the key and keylen parameters.

There are already test cases for parsing an empty buffer. A subsequent
commit will add tests for writing to an empty buffer.
This commit is contained in:
Gilles Peskine
2018-12-19 17:03:28 +01:00
parent 1f19fa6f62
commit 159171b72a
3 changed files with 39 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
library/pkwrite.c
View File

@ -186,7 +186,9 @@ int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, si
const char *oid;
PK_VALIDATE_RET( key != NULL );
PK_VALIDATE_RET( buf != NULL || size == 0 );
if( size == 0 )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
PK_VALIDATE_RET( buf != NULL );
c = buf + size;
@ -236,7 +238,9 @@ int mbedtls_pk_write_key_der( mbedtls_pk_context *key, unsigned char *buf, size_
size_t len = 0;
PK_VALIDATE_RET( key != NULL );
PK_VALIDATE_RET( buf != NULL || size == 0 );
if( size == 0 )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
PK_VALIDATE_RET( buf != NULL );
c = buf + size;