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1
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from ecdsa import SigningKey, SECP256k1, VerifyingKey |
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2
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from ecdsa import util as ecdsaUtil |
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3
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import binascii |
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4
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import hashlib |
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5
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6
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def generate_pem(): |
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7
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sk = SigningKey.generate(curve=SECP256k1) |
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8
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pem = sk.to_pem() |
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9
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pem = pem.decode("utf-8") |
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10
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return pem |
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11
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12
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def get_sin_from_pem(pem): |
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13
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public_key = get_compressed_public_key_from_pem(pem) |
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14
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version = get_version_from_compressed_key(public_key) |
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15
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checksum = get_checksum_from_version(version) |
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16
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return base58encode(version + checksum) |
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18
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def get_compressed_public_key_from_pem(pem): |
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vks = SigningKey.from_pem(pem).get_verifying_key().to_string() |
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20
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bts = binascii.hexlify(vks) |
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21
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compressed = compress_key(bts) |
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return compressed |
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23
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24
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def sign(message, pem): |
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message = message.encode() |
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sk = SigningKey.from_pem(pem) |
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27
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signed = sk.sign(message, hashfunc=hashlib.sha256, sigencode=ecdsaUtil.sigencode_der) |
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return binascii.hexlify(signed).decode() |
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29
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30
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def base58encode(hexastring): |
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chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz' |
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32
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int_val = int(hexastring, 16) |
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33
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encoded = encode58("", int_val, chars) |
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return encoded |
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36
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def encode58(string, int_val, chars): |
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if int_val == 0: |
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return string |
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39
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else: |
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40
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new_val, rem = divmod(int_val, 58) |
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41
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new_string = (chars[rem]) + string |
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42
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return encode58(new_string, new_val, chars) |
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43
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44
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def get_checksum_from_version(version): |
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return sha_digest(sha_digest(version))[0:8] |
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46
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47
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def get_version_from_compressed_key(key): |
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48
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sh2 = sha_digest(key) |
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49
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rphash = hashlib.new('ripemd160') |
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50
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rphash.update(binascii.unhexlify(sh2)) |
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51
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rp1 = rphash.hexdigest() |
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52
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return '0F02' + rp1 |
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53
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54
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def sha_digest(hexastring): |
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55
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return hashlib.sha256(binascii.unhexlify(hexastring)).hexdigest() |
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56
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57
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def compress_key(bts): |
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58
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intval = int(bts, 16) |
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59
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prefix = find_prefix(intval) |
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60
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return prefix + bts[0:64].decode("utf-8") |
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61
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62
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def find_prefix(intval): |
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63
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if(intval % 2 == 0): |
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64
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prefix = '02' |
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65
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else: |
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66
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prefix = '03' |
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return prefix |
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68
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69
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bitpay /
bitpay-python
