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package body RMD is
function F(J : Round_Index; X,Y,Z : Word) return Word
is
Result: Word;
begin
if 0 <= J and J <= 15 then Result := X xor Y xor Z;
elsif 16 <= J and J <= 31 then Result := (X and Y) or (not X and Z);
elsif 32 <= J and J <= 47 then Result := (X or not Y) xor Z;
elsif 48 <= J and J <= 63 then Result := (X and Z) or (Y and not Z);
else Result := X xor (Y or not Z);
end if;
return Result;
end F;
function K_L(J : Round_Index) return Word
is
K: Word;
begin
if 0 <= J and J <= 15 then K := 16#0000_0000#;
elsif 16 <= J and J <= 31 then K := 16#5A82_7999#;
elsif 32 <= J and J <= 47 then K := 16#6ED9_EBA1#;
elsif 48 <= J and J <= 63 then K := 16#8F1B_BCDC#;
else K := 16#A953_FD4E#;
end if;
return K;
end K_L;
function K_R(J : Round_Index) return Word
is
K: Word;
begin
if 0 <= J and J <= 15 then K := 16#50A2_8BE6#;
elsif 16 <= J and J <= 31 then K := 16#5C4D_D124#;
elsif 32 <= J and J <= 47 then K := 16#6D70_3EF3#;
elsif 48 <= J and J <= 63 then K := 16#7A6D_76E9#;
else K := 16#0000_0000#;
end if;
return K;
end K_R;
function R_L(J : Round_Index) return Block_Index
is
R_Values : constant Block_Permutation := Block_Permutation'
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13);
--# for R_Values declare rule;
begin
return R_Values(J);
end R_L;
function R_R(J : Round_Index) return Block_Index
is
R_Values : constant Block_Permutation := Block_Permutation'
(5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11);
--# for R_Values declare rule;
begin
return R_Values(J);
end R_R;
function S_L(J : Round_Index) return Rotate_Amount
is
S_Values : constant Rotate_Definition := Rotate_Definition'
(11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6);
--# for S_Values declare rule;
begin
return S_Values(J);
end S_L;
function S_R(J : Round_Index) return Rotate_Amount
is
S_Values : constant Rotate_Definition := Rotate_Definition'
(8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11);
--# for S_Values declare rule;
begin
return S_Values(J);
end S_R;
procedure Round(CA, CB, CC, CD, CE : in out Word; X : in Block)
is
CLA, CLB, CLC, CLD, CLE, CRA, CRB, CRC, CRD, CRE : Word;
T : Word;
begin
CLA := CA;
CLB := CB;
CLC := CC;
CLD := CD;
CLE := CE;
CRA := CA;
CRB := CB;
CRC := CC;
CRD := CD;
CRE := CE;
for J in Round_Index range 0..79
loop
-- left
T := Wordops.Rotate(S_L(J),
CLA +
F(J, CLB, CLC, CLD) +
X(R_L(J)) +
K_L(J)) +
CLE;
CLA := CLE;
CLE := CLD;
CLD := Wordops.Rotate(10, CLC);
CLC := CLB;
CLB := T;
-- right
T := Wordops.Rotate(S_R(J),
CRA +
F(79 - J, CRB, CRC, CRD) +
X(R_R(J)) +
K_R(J)) +
CRE;
CRA := CRE;
CRE := CRD;
CRD := Wordops.Rotate(10, CRC);
CRC := CRB;
CRB := T;
--# assert Chain_Pair'(Chain'(CLA, CLB, CLC, CLD, CLE),
--# Chain'(CRA, CRB, CRC, CRD, CRE)) =
--# steps(Chain_Pair'(Chain'(CA~, CB~, CC~, CD~, CE~),
--# Chain'(CA~, CB~, CC~, CD~, CE~)), J + 1, X)
--# and CA = CA~ and CB = CB~ and CC = CC~ and CD = CD~ and CE = CE~;
end loop;
T := CB + CLC + CRD;
CB := CC + CLD + CRE;
CC := CD + CLE + CRA;
CD := CE + CLA + CRB;
CE := CA + CLB + CRC;
CA := T;
end Round;
function Hash(X : Message) return Chain
is
CA_Init : constant Word := 16#6745_2301#;
CB_Init : constant Word := 16#EFCD_AB89#;
CC_Init : constant Word := 16#98BA_DCFE#;
CD_Init : constant Word := 16#1032_5476#;
CE_Init : constant Word := 16#C3D2_E1F0#;
CA, CB, CC, CD, CE : Word;
begin
CA := CA_Init;
CB := CB_Init;
CC := CC_Init;
CD := CD_Init;
CE := CE_Init;
for I in Message_Index range X'First..X'Last
loop
Round(CA, CB, CC, CD, CE, X(I));
--# assert Chain'(CA, CB, CC, CD, CE) = rounds(
--# Chain'(CA_Init, CB_Init, CC_Init, CD_Init, CE_Init),
--# I + 1,
--# X);
end loop;
return Chain'(CA, CB, CC, CD, CE);
end Hash;
end RMD;
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