def testSingleTx():
if os.path.exists('DSA_pkey.txt') == True and os.path.exists(
'DSA_skey.txt') == True:
skeyFile = open('DSA_skey.txt', 'r')
q = int(skeyFile.readline())
p = int(skeyFile.readline())
g = int(skeyFile.readline())
alpha = int(skeyFile.readline())
skeyFile.close()
print("Public key is read from DSA_skey.txt")
pkeyFile = open('DSA_pkey.txt', 'r')
lines = pkeyFile.readlines()
beta = int(lines[3])
pkeyFile.close()
print("Public key is read from DSA_pkey.txt")
else:
print('DSA_skey.txt or DSA_pkey.txt does not exist')
sys.exit()
# pick a random message (string)
TxFile = open("SingleTransaction.txt", "w")
lines = TxFile.readlines()
m = lines[0:9]
print("message: ", m)
r = int(lines[9][15:])
s = int(lines[10][15:])
print("Signature:")
print("r: ", r)
print("s: ", s)
if DSA.SignVer(m, r, s, p, q, g, beta) == 1:
print("Signature verifies:))")
else:
print("Signature does not verify:((")
sys.exit()
sys.exit()
TxBlockFile = open(TxBlockFileName, "r")
lines = TxBlockFile.readlines()
TxBlockFile.close()
# read the transaction txNo from the file and verify its signature
transaction = lines[txNo*TxLen:(txNo+1)*TxLen]
SignedPart = "".join(transaction[0:TxLen-2])
p = int(transaction[2][3:])
q = int(transaction[3][3:])
g = int(transaction[4][3:])
beta = int(transaction[5][25:])
r = int(transaction[8][15:])
s = int(transaction[9][15:])
if DSA.SignVer(SignedPart, r, s, p, q, g, beta)==1:
print "The signature of the transaction verifies:))"
else:
print "The signature of the transaction does not verify:(("
# Check if the transaction really belongs to that block
# using "LongestChain.txt file"
# The method is hash tree
BlockChainFileName = "LongestChain.txt"
if os.path.exists(BlockChainFileName) == False:
print "Error: ", BlockChainFileName, "does not exist"
sys.exit()
BlockChainFile = open(BlockChainFileName, "r")
blocks = BlockChainFile.readlines()
# read the root hash from the BlockChainFileName file
pkeyFile.close()
print("Public key is read from DSA_pkey.txt")
else:
print('DSA_skey.txt or DSA_pkey.txt does not exist')
sys.exit()
# pick a random message (string)
m = random_string(random.randint(1, 100))
print("message: ", m)
(r, s) = DSA.SignGen(m, p, q, g, alpha, beta)
print("Signature:")
print("r: ", r)
print("s: ", s)
if DSA.SignVer(m, r, s, p, q, g, beta) == 1:
print("Signature verifies:))")
else:
print("Signature does not verify:((")
sys.exit()
# Generate a random transaction along with its signature
if TxGenOn:
if KeyGenOn == 0:
if os.path.exists('DSA_pkey.txt') == True and os.path.exists(
'DSA_skey.txt') == True:
skeyFile = open('DSA_skey.txt', 'r')
q = int(skeyFile.readline())
p = int(skeyFile.readline())
g = int(skeyFile.readline())
alpha = int(skeyFile.readline())
