DandelionNStuff/dkimpy-smtputf8
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Fix EMSA-PKCS1-v1_5-ENCODE digest length check. The spec requires at least 8 bytes of padding.

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This commit is contained in:
William Grant
2011-03-19 17:33:11 +11:00
parent d5ffbac38a
commit 80c518d30b
1 changed files with 3 additions and 2 deletions
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dkim/crypto.py
+3 -2
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@@ -21,6 +21,7 @@
__all__ = [ __all__ = [
'DigestTooLargeError', 'DigestTooLargeError',
'parse_pem_private_key',
'parse_private_key', 'parse_private_key',
'parse_public_key', 'parse_public_key',
'RSASSA_PKCS1_v1_5_sign', 'RSASSA_PKCS1_v1_5_sign',
@@ -138,7 +139,7 @@ def parse_private_key(data):
def parse_pem_private_key(data): def parse_pem_private_key(data):
"""Parse a PEM private key. """Parse a PEM RSA private key.
@param data: RFC3447 RSAPrivateKey in PEM format. @param data: RFC3447 RSAPrivateKey in PEM format.
@return: RSA private key @return: RSA private key
@@ -168,7 +169,7 @@ def EMSA_PKCS1_v1_5_encode(hash, mlen):
]), ]),
(OCTET_STRING, hash.digest()), (OCTET_STRING, hash.digest()),
])) ]))
if len(dinfo)+3 > mlen: if len(dinfo) + 11 > mlen:
raise DigestTooLargeError() raise DigestTooLargeError()
return "\x00\x01"+"\xff"*(mlen-len(dinfo)-3)+"\x00"+dinfo return "\x00\x01"+"\xff"*(mlen-len(dinfo)-3)+"\x00"+dinfo