hbc/pywii/pywii-tools/ecsign.py

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2016-11-30 10:57:03 +01:00
#!/usr/bin/env python2
2016-11-23 06:35:12 +01:00
import sys
import pywii as wii
if len(sys.argv) != 4:
print "Usage: %s keyfile.priv infile outfile"%sys.argv[0]
sys.exit(1)
if sys.argv[1] == "-":
k = sys.stdin.read()
else:
k = open(sys.argv[1],"rb").read()
if len(k) != 30:
print "Failed to read private key"
sys.exit(2)
indata = open(sys.argv[2],"rb").read()
sha = wii.SHA.new(indata).digest()
print "SHA1: %s"%sha.encode('hex')
print
print "Signature:"
r,s = wii.ec.generate_ecdsa(k,sha)
print "R =",r[:15].encode('hex')
print " ",r[15:].encode('hex')
print "S =",s[:15].encode('hex')
print " ",s[15:].encode('hex')
outdata = "SIG0" + r + s + indata
fd = open(sys.argv[3],"wb")
fd.write(outdata)
fd.close()