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Added some documentation

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git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@514 96b47cad-a561-4643-ad3b-153ac7d7599c
This commit is contained in:
oepen
2011-09-01 14:42:34 +00:00
parent fe6c2c7f31
commit 2e2ad5e47b
1 changed files with 11 additions and 1 deletions
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12
virtualsmartcard/src/vpicc/virtualsmartcard/CryptoUtils.py
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@@ -112,7 +112,6 @@ def strip_padding(cipherspec, data, padding_class=0x01):
Strip the padding of decrypted data. Returns data without padding Strip the padding of decrypted data. Returns data without padding
""" """
#TODO: Sanity check
if padding_class == 0x01: if padding_class == 0x01:
tail = len(data) - 1 tail = len(data) - 1
while data[tail] != '\x80': while data[tail] != '\x80':
@@ -120,6 +119,17 @@ def strip_padding(cipherspec, data, padding_class=0x01):
return data[:tail] return data[:tail]
def crypto_checksum(algo, key, data, iv=None, ssc=None): def crypto_checksum(algo, key, data, iv=None, ssc=None):
"""
Compute various types of cryptographic checksums.
@param algo: A string specifying the algorithm to use. Currently supported
algorithms are \"MAX\" \"HMAC\" and \"CC\" (Meaning a
cryptographic checksum as used by the ICAO passports)
@param key: They key used to computed the cryptographic checksum
@param data: The data for which to calculate the checksum
@iv: Optional. An initialization vector. Only used by the \"MAC\" algorithm
@ssc: Optional. A send sequence counter to be prepended to the data. Only
used by the \"CC\" algorithm
"""
if algo not in ("HMAC", "MAC", "CC"): if algo not in ("HMAC", "MAC", "CC"):
raise ValueError, "Unknown Algorithm %s" % algo raise ValueError, "Unknown Algorithm %s" % algo