DandelionNStuff/dkimpy-smtputf8
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Factor out RSA into perform_rsa.

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William Grant
2011-03-09 23:37:59 +11:00
parent 6f715a1a01
commit 5898094fe1
1 changed files with 6 additions and 2 deletions
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dkim/__init__.py
+6 -2
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@@ -152,6 +152,9 @@ def validate_signature_fields(sig, debuglog=None):
return False return False
return True return True
def perform_rsa(input, exponent, modulus, modlen):
return int2str(pow(str2int(input), exponent, modulus), modlen)
# These values come from RFC 3447, section 9.2 Notes, page 43. # These values come from RFC 3447, section 9.2 Notes, page 43.
HASHID_SHA1 = "\x2b\x0e\x03\x02\x1a" HASHID_SHA1 = "\x2b\x0e\x03\x02\x1a"
HASHID_SHA256 = "\x60\x86\x48\x01\x65\x03\x04\x02\x01" HASHID_SHA256 = "\x60\x86\x48\x01\x65\x03\x04\x02\x01"
@@ -315,7 +318,7 @@ def sign(message, selector, domain, privkey, identity=None, canonicalize=(Simple
modlen = len(int2str(pk['modulus'])) modlen = len(int2str(pk['modulus']))
encoded = EMSA_PKCS1_v1_5_encode(d, modlen, HASHID_SHA256) encoded = EMSA_PKCS1_v1_5_encode(d, modlen, HASHID_SHA256)
sig2 = int2str(pow(str2int(encoded), pk['privateExponent'], pk['modulus']), modlen) sig2 = perform_rsa(encoded, pk['privateExponent'], pk['modulus'], modlen)
sig += base64.b64encode(''.join(sig2)) sig += base64.b64encode(''.join(sig2))
return sig + "\r\n" return sig + "\r\n"
@@ -446,7 +449,8 @@ def verify(message, debuglog=None, dnsfunc=dnstxt):
print >>debuglog, "sig2:", " ".join("%02x" % ord(x) for x in sig2) print >>debuglog, "sig2:", " ".join("%02x" % ord(x) for x in sig2)
print >>debuglog, sig['b'] print >>debuglog, sig['b']
print >>debuglog, re.sub(r"\s+", "", sig['b']) print >>debuglog, re.sub(r"\s+", "", sig['b'])
v = int2str(pow(str2int(base64.b64decode(re.sub(r"\s+", "", sig['b']))), pk['publicExponent'], pk['modulus']), modlen) signature = base64.b64decode(re.sub(r"\s+", "", sig['b']))
v = perform_rsa(signature, pk['publicExponent'], pk['modulus'], modlen)
if debuglog is not None: if debuglog is not None:
print >>debuglog, "v:", " ".join("%02x" % ord(x) for x in v) print >>debuglog, "v:", " ".join("%02x" % ord(x) for x in v)
assert len(v) == len(sig2) assert len(v) == len(sig2)