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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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128
Task/Bitcoin-address-validation/Ada/bitcoin-address-validation.ada
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with Ada.Exceptions, Interfaces;
with Ada.Streams;
use Ada.Exceptions, Interfaces;
use Ada.Streams;
package Bitcoin is
subtype BT_Raw_Addr is Stream_Element_Array(1..25);
subtype BT_Checksum is Stream_Element_Array(1..4);
subtype BT_Addr is String(1..34);
subtype Sha256String is String(1..64);
Invalid_Address_Error : Exception;
function Double_Sha256(S : Stream_Element_Array) return BT_Checksum;
function Is_Valid(A : BT_Raw_Addr) return Boolean;
procedure Base58_Decode(S : BT_Addr; A : out BT_Raw_Addr) ;
private
Base58 : constant String := "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
function Hex_Val (C, C2 : Character) return Stream_Element;
end Bitcoin;
with GNAT.SHA256, Ada.Strings.Fixed;
use GNAT.SHA256, Ada.Strings.Fixed;
package body Bitcoin is
function Hex_Val (C, C2 : Character) return Stream_Element is
subtype Nibble is Integer range 0..15;
HEX : array (0..255) of Nibble := (
48=>0, 49=>1, 50=>2, 51=>3, 52=>4, 53=>5, 54=>6, 55=>7, 56=>8, 57=>9
, 65=>10, 66=>11, 67=>12, 68 =>13, 69 =>14, 70 =>15
, 97=>10, 98=>11, 99=>12, 100=>13, 101=>14, 102=>15
, Others=>0
);
begin
return Stream_Element(HEX(Character'Pos(C)) * 16 + HEX(Character'Pos(C2)));
end Hex_Val;
function Double_Sha256(S : Stream_Element_Array) return BT_Checksum is
Ctx : Context := Initial_Context;
D : Message_Digest;
S2 : Stream_Element_Array(1..32);
Ctx2 : Context := Initial_Context;
C : BT_Checksum;
begin
Update(Ctx, S);
D := Digest(Ctx);
for I in S2'Range loop
S2(I) := Hex_Val(D(Integer(I)*2-1), D(Integer(I)*2));
end loop;
Update(Ctx2, S2);
D := Digest(Ctx2);
for I in C'Range loop
C(I) := Hex_Val(D(Integer(I)*2-1), D(Integer(I)*2));
end loop;
return C;
end Double_Sha256;
--------------------------------------------------------------------------------
-- Summary of Base58: --
-- We decode S into a 200 bit unsigned integer. --
-- We could use a BigNum library, but choose to go without. --
--------------------------------------------------------------------------------
procedure Base58_Decode(S : BT_Addr; A : out BT_Raw_Addr) is
begin
A := (Others => 0);
for I in S'Range loop
declare
P : Natural := Index(Base58, String(S(I..I)));
C : Natural;
begin
if P = 0 then
raise Invalid_Address_Error;
end if;
C := P - 1;
for J in reverse A'Range loop
C := C + Natural(A(J)) * 58;
A(J) := Stream_Element(Unsigned_32(C) and 255); -- 0x00FF
C := Natural(Shift_Right(Unsigned_32(C),8) and 255); -- 0xFF00
end loop;
if C /= 0 then
raise Invalid_Address_Error;
end if;
end;
end loop;
end Base58_Decode;
function Is_Valid(A : BT_Raw_Addr) return Boolean is
begin
return A(1) = 0 and A(22..25) = Double_Sha256(A(1..21));
end Is_Valid;
end Bitcoin;
with Ada.Text_IO, Bitcoin;
use Ada.Text_IO, Bitcoin;
procedure Bitcoin_Addr_Validate is
begin
declare
BTs : array (positive range <>) of BT_Addr := (
"1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i" -- VALID
, "1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nK9" -- VALID
, "1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62X" -- checksum changed, original data.
, "1ANNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i" -- data changed, original checksum.
, "1A Na15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i" -- invalid chars
);
begin
for I in Bts'Range loop
declare
A : BT_Raw_Addr;
Valid : Boolean;
begin
Put(BTs(I) & " validity: ");
Base58_Decode(BTs(I), A);
Valid := Is_Valid(A);
Put_Line(Boolean'Image(Valid));
exception
when E : Invalid_Address_Error =>
Put_Line ("*** Error: Invalid BT address.");
end;
end loop;
end;
end Bitcoin_Addr_Validate;