[RFC][PATCH 1/2] bitbake: utils.py: add sha384_file and sha512_file

[Jean-Marie LEMETAYER <jean-marie.lemetayer@savoirfairelinux.com>]

This commit adds the "sha384_file" and "sha512_file" functions in order
to check the integrity of the downloaded npm packages as npm now use
Subresource Integrity:

  https://w3c.github.io/webappsec-subresource-integrity

Signed-off-by: Jean-Marie LEMETAYER <jean-marie.lemetayer@savoirfairelinux.com>
---
 lib/bb/utils.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/bb/utils.py b/lib/bb/utils.py
index d035949b..34152855 100644
--- a/lib/bb/utils.py
+++ b/lib/bb/utils.py
@@ -562,6 +562,30 @@ def sha1_file(filename):
             s.update(line)
     return s.hexdigest()
 
+def sha384_file(filename):
+    """
+    Return the hex string representation of the SHA384 checksum of the filename
+    """
+    import hashlib
+
+    s = hashlib.sha384()
+    with open(filename, "rb") as f:
+        for line in f:
+            s.update(line)
+    return s.hexdigest()
+
+def sha512_file(filename):
+    """
+    Return the hex string representation of the SHA512 checksum of the filename
+    """
+    import hashlib
+
+    s = hashlib.sha512()
+    with open(filename, "rb") as f:
+        for line in f:
+            s.update(line)
+    return s.hexdigest()
+
 def preserved_envvars_exported():
     """Variables which are taken from the environment and placed in and exported
     from the metadata"""
-- 
2.20.1