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caustic

0.1.7
0.1.25 0.1.24 0.1.23 0.1.22 0.1.21 0.1.20 0.1.19 0.1.18 0.1.17 0.1.16 0.1.14 0.1.13 0.1.12 0.1.11 0.1.10 0.1.9 0.1.8 0.1.7 0.1.6 0.1.4 0.1.3 0.1.2

An Elixir cryptocurrency library which contains algorithms used in Bitcoin, Ethereum, and other blockchains. Includes a rich cryptography, number theory, and general mathematics class library.

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+14 additions
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  @@ -12,7 +12,7 @@ https://hexdocs.pm/caustic/
12 12 ```elixir
13 13 def deps do
14 14 [
15 - {:caustic, "~> 0.1.3"}
15 + {:caustic, "~> 0.1.7"}
16 16 ]
17 17 end
18 18 ```
  @@ -12,4 +12,4 @@
12 12 {<<"links">>,[{<<"GitHub">>,<<"https://github.com/agro1986/caustic">>}]}.
13 13 {<<"name">>,<<"caustic">>}.
14 14 {<<"requirements">>,[]}.
15 - {<<"version">>,<<"0.1.6">>}.
15 + {<<"version">>,<<"0.1.7">>}.
  @@ -72,6 +72,7 @@ defmodule Caustic.ECPoint do
72 72 {-1, -1, 5, 7}
73 73 iex> Caustic.ECPoint.add(Caustic.ECPoint.make(-1, 1, 5, 7), Caustic.ECPoint.make(-1, -1, 5, 7))
74 74 {nil, nil, 5, 7}
75 +
75 76 iex> p = 223
76 77 iex> a = {0, p}
77 78 iex> b = {7, p}
  @@ -83,6 +84,7 @@ defmodule Caustic.ECPoint do
83 84 iex> p2 = Caustic.ECPoint.make(x2, y2, a, b)
84 85 iex> Caustic.ECPoint.add(p1, p2)
85 86 {{170, 223}, {142, 223}, {0, 223}, {7, 223}}
87 +
86 88 iex> p = 223
87 89 iex> a = {0, p}
88 90 iex> b = {7, p}
  @@ -94,7 +96,6 @@ defmodule Caustic.ECPoint do
94 96 """
95 97 def add(p1, p2 = _inf = {nil, nil, _a, _b}), do: add(p2, p1)
96 98 def add({nil, nil, a, b}, {x, y, a, b}), do: {x, y, a, b}
97 - def add({x, y1, a, b}, {x, y2, a, b}) when y1 == -y2, do: infinity(a, b)
98 99 def add({x, y, a, b}, {x, y, a, b}) do
99 100 s = F.div(F.add(F.mul(F.mul(x, x), 3), a), F.mul(y, 2)) # (3 * x * x + a) / (2 * y)
100 101 x3 = F.sub(F.mul(s, s), F.mul(x, 2)) # s * s - 2 * x
  @@ -102,11 +103,15 @@ defmodule Caustic.ECPoint do
102 103 {x3, y3, a, b}
103 104 end
104 105 def add({x1, y1, a, b}, {x2, y2, a, b}) do
105 - # https://github.com/jimmysong/programmingbitcoin/blob/master/ch02.asciidoc
106 - s = F.div(F.sub(y2, y1), F.sub(x2, x1)) # (y2 - y1) / (x2 - x1)
107 - x3 = F.sub(F.sub(F.mul(s, s), x1), x2) # s * s - x1 - x2
108 - y3 = F.sub(F.mul(s, F.sub(x1, x3)), y1) # s * (x1 - x3) - y1
109 - {x3, y3, a, b}
106 + if F.eq?(y1, F.neg(y2)) do
107 + infinity(a, b)
108 + else
109 + # https://github.com/jimmysong/programmingbitcoin/blob/master/ch02.asciidoc
110 + s = F.div(F.sub(y2, y1), F.sub(x2, x1)) # (y2 - y1) / (x2 - x1)
111 + x3 = F.sub(F.sub(F.mul(s, s), x1), x2) # s * s - x1 - x2
112 + y3 = F.sub(F.mul(s, F.sub(x1, x3)), y1) # s * (x1 - x3) - y1
113 + {x3, y3, a, b}
114 + end
110 115 end
111 116
112 117 @doc """
  @@ -6,7 +6,7 @@ defmodule Caustic.MixProject do
6 6 app: :caustic,
7 7 name: "Caustic",
8 8 source_url: "https://github.com/agro1986/caustic",
9 - version: "0.1.6",
9 + version: "0.1.7",
10 10 elixir: "~> 1.7",
11 11 description: description(),
12 12 build_embedded: Mix.env == :prod,