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"""
Utilities needed during the signing process
"""
import hashlib
import hmac
def sha256_hash(val):
"""
Sha256 hash of text data.
"""
return hashlib.sha256(val.encode('utf-8')).hexdigest()
def sha256_hash_for_binary_data(val):
"""
Sha256 hash of binary data.
"""
return hashlib.sha256(val).hexdigest()
def sign(key, msg):
"""
Key derivation functions.
See: http://docs.aws.amazon.com
/general/latest/gr/signature-v4-examples.html
#signature-v4-examples-python
"""
return hmac.new(key, msg.encode('utf-8'), hashlib.sha256).digest()
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