[RFC PATCH v2 1/8] dtoc: openssl: Add GetHexOctet method

[Manorit Chawdhry]

HexOctet format is used by openssl for FORMAT:HEX,OCT property in x509
certificates. Add a helper function to extract the integer numbers in
HEX,OCT format to pass to openssl directly.

Signed-off-by: Manorit Chawdhry <m-chawdhry at ti.com>
---
 tools/dtoc/fdt_util.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/dtoc/fdt_util.py b/tools/dtoc/fdt_util.py
index f1f70568cfef..d51dbf5633d0 100644
--- a/tools/dtoc/fdt_util.py
+++ b/tools/dtoc/fdt_util.py
@@ -100,6 +100,26 @@ def EnsureCompiled(fname, tmpdir=None, capture_stderr=False):
     command.run(dtc, *args, capture_stderr=capture_stderr)
     return dtb_output
 
+def GetHexOctet(node, propname, default=None):
+    """Get an integer from a property in hex octet form required by openssl
+
+    Args:
+        node: Node object to read from
+        propname: property name to read
+        default: Default value to use if the node/property do not exist
+
+    Returns:
+        Integer value read as a String in Hex Octet Form
+    """
+    prop = node.props.get(propname)
+    if not isinstance(prop.value, list) or len(prop.value) != 2:
+        value = GetInt(node, propname)
+    elif isinstance(prop.value, list) and len(prop.value) == 2:
+        value = GetInt64(node, propname)
+
+    hex_value = '%x' % (value)
+    return ('0' * (len(hex_value) & 1)) + hex_value
+
 def GetInt(node, propname, default=None):
     """Get an integer from a property
 

-- 
2.41.0