def from_target_upper_bound(cls, target):
n = math.natural_to_string(target)
if n and ord(n[0]) >= 128:
n = '\x00' + n
bits2 = (chr(len(n)) + (n + 3 * chr(0))[:3])[::-1]
bits = pack.IntType(32).unpack(bits2)
return cls(bits)
def create_push_script(datums): # datums can be ints or strs
res = []
for datum in datums:
if isinstance(datum, (int, long)):
if datum == -1 or 1 <= datum <= 16:
res.append(chr(datum + 80))
continue
negative = datum < 0
datum = math.natural_to_string(abs(datum))
if datum and ord(datum[0]) & 128:
datum = '\x00' + datum
if negative:
datum = chr(ord(datum[0]) + 128) + datum[1:]
datum = datum[::-1]
if len(datum) < 76:
res.append(chr(len(datum)))
elif len(datum) <= 0xff:
res.append(76)
res.append(chr(len(datum)))
elif len(datum) <= 0xffff:
res.append(77)
res.append(pack.IntType(16).pack(len(datum)))
elif len(datum) <= 0xffffffff:
res.append(78)
res.append(pack.IntType(32).pack(len(datum)))
else:
raise ValueError('string too long')
res.append(datum)
return ''.join(res)
def from_target_upper_bound(cls, target):
n = math.natural_to_string(target)
if n and ord(n[0]) >= 128:
n = '\x00' + n
bits2 = (chr(len(n)) + (n + 3*chr(0))[:3])[::-1]
bits = pack.IntType(32).unpack(bits2)
return cls(bits)
def create_push_script(datums): # datums can be ints or strs
res = []
for datum in datums:
if isinstance(datum, (int, long)):
if datum == -1 or 1 <= datum <= 16:
res.append(chr(datum + 80))
continue
negative = datum < 0
datum = math.natural_to_string(abs(datum))
if datum and ord(datum[0]) & 128:
datum = '\x00' + datum
if negative:
datum = chr(ord(datum[0]) + 128) + datum[1:]
datum = datum[::-1]
if len(datum) < 76:
res.append(chr(len(datum)))
elif len(datum) <= 0xff:
res.append(76)
res.append(chr(len(datum)))
elif len(datum) <= 0xffff:
res.append(77)
res.append(pack.IntType(16).pack(len(datum)))
elif len(datum) <= 0xffffffff:
res.append(78)
res.append(pack.IntType(32).pack(len(datum)))
else:
raise ValueError('string too long')
res.append(datum)
return ''.join(res)
def test_bases(self):
for i in xrange(10):
alphabet = generate_alphabet()
for i in xrange(100):
n = random.randrange(100000000000000000000000000000)
s = math.natural_to_string(n, alphabet)
n2 = math.string_to_natural(s, alphabet)
#print n, s.encode('hex'), n2
self.assertEquals(n, n2)
def test_bases(self):
for i in xrange(10):
alphabet = generate_alphabet()
for i in xrange(100):
n = random.choice([
random.randrange(3),
random.randrange(300),
random.randrange(100000000000000000000000000000),
])
s = math.natural_to_string(n, alphabet)
n2 = math.string_to_natural(s, alphabet)
#print n, s.encode('hex'), n2
self.assertEquals(n, n2)
def base58_decode(b58data):
b58data2 = b58data.lstrip(base58_alphabet[0])
return chr(0) * (len(b58data) - len(b58data2)) + math.natural_to_string(
math.string_to_natural(b58data2, base58_alphabet))
def base58_encode(bindata):
bindata2 = bindata.lstrip(chr(0))
return base58_alphabet[0] * (
len(bindata) - len(bindata2)) + math.natural_to_string(
math.string_to_natural(bindata2), base58_alphabet)
def base58_decode(b58data):
b58data2 = b58data.lstrip(base58_alphabet[0])
return chr(0)*(len(b58data) - len(b58data2)) + math.natural_to_string(math.string_to_natural(b58data2, base58_alphabet))
def base58_encode(bindata):
bindata2 = bindata.lstrip(chr(0))
return base58_alphabet[0]*(len(bindata) - len(bindata2)) + math.natural_to_string(math.string_to_natural(bindata2), base58_alphabet)
