module salsa20; private: import std.string : format; import std.range : isInputRange, isForwardRange, ElementType; import std.array; import bitmanip; import utility; public: // TODO: Implement random access auto salsa20Cipher(R)(R range, ubyte[32] key, ubyte[8] nonce) if (isInputRange!R && is(ElementType!R : ubyte)) { struct rangeResult { private: ulong count; R range; ubyte[64] salsaSection; uint salsaCounter; public: bool empty() @property { return range.empty || (count == ulong.max && salsaCounter == 64); } ubyte front() @property { assert(!empty); return range.front ^ salsaSection[salsaCounter]; } void popFront() { assert(!empty); if (++salsaCounter == 64) { salsaSection = salsa20Exp(key, concat!(ubyte[16])(nonce, littleEndianInv(++count))); salsaCounter = 0; } range.popFront(); } static if (isForwardRange!R) { auto save() @property { return rangeResult(count, range.save, salsaSection); } } } return rangeResult(0UL, range, salsa20Exp(key, concat!(ubyte[16])(nonce, littleEndianInv(0UL)))); } // TODO: Create more unittests!!! @safe unittest { ubyte[] test = new ubyte[64]; ubyte[32] key; ubyte[8] nonce; test = test.salsa20Cipher(key, nonce).array; assert(test == [154,151,246, 91,155, 76,114, 27,150, 10,103, 33, 69,252,168,212, 227, 46,103,249, 17, 30,169,121,206,156, 72, 38,128,106,238,230, 61,233,192,218, 43,215,249, 30,188,178, 99,155,249,137,198, 37, 27, 41,191, 56,211,154,155,220,231,197, 95, 75, 42,193, 42, 57]); } private: enum string quarterRound(alias _x0, alias _x1, alias _x2, alias _x3) = q{ %2$s ^= (%1$s + %4$s).rotateLeft(7); %3$s ^= (%2$s + %1$s).rotateLeft(9); %4$s ^= (%3$s + %2$s).rotateLeft(13); %1$s ^= (%4$s + %3$s).rotateLeft(18); }.format(__traits(identifier, _x0), __traits(identifier, _x1), __traits(identifier, _x2), __traits(identifier, _x3)); @safe unittest { uint a1 = 0x00000000, a2 = 0x00000000, a3 = 0x00000000, a4 = 0x00000000, b1 = 0x00000001, b2 = 0x00000000, b3 = 0x00000000, b4 = 0x00000000, c1 = 0x00000000, c2 = 0x00000001, c3 = 0x00000000, c4 = 0x00000000, d1 = 0x00000000, d2 = 0x00000000, d3 = 0x00000001, d4 = 0x00000000, e1 = 0x00000000, e2 = 0x00000000, e3 = 0x00000000, e4 = 0x00000001, f1 = 0xe7e8c006, f2 = 0xc4f9417d, f3 = 0x6479b4b2, f4 = 0x68c67137, g1 = 0xd3917c5b, g2 = 0x55f1c407, g3 = 0x52a58a7a, g4 = 0x8f887a3b; mixin(quarterRound!(a1, a2, a3, a4)); mixin(quarterRound!(b1, b2, b3, b4)); mixin(quarterRound!(c1, c2, c3, c4)); mixin(quarterRound!(d1, d2, d3, d4)); mixin(quarterRound!(e1, e2, e3, e4)); mixin(quarterRound!(f1, f2, f3, f4)); mixin(quarterRound!(g1, g2, g3, g4)); assert([a1, a2, a3, a4] == [0x00000000, 0x00000000, 0x00000000, 0x00000000]); assert([b1, b2, b3, b4] == [0x08008145, 0x00000080, 0x00010200, 0x20500000]); assert([c1, c2, c3, c4] == [0x88000100, 0x00000001, 0x00000200, 0x00402000]); assert([d1, d2, d3, d4] == [0x80040000, 0x00000000, 0x00000001, 0x00002000]); assert([e1, e2, e3, e4] == [0x00048044, 0x00000080, 0x00010000, 0x20100001]); assert([f1, f2, f3, f4] == [0xe876d72b, 0x9361dfd5, 0xf1460244, 0x948541a3]); assert([g1, g2, g3, g4] == [0x3e2f308c, 0xd90a8f36, 0x6ab2a923, 0x2883524c]); } enum string rowRound(alias _x00, alias _x01, alias _x02, alias _x03, alias _x04, alias _x05, alias _x06, alias _x07, alias _x08, alias _x09, alias _x10, alias _x11, alias _x12, alias _x13, alias _x14, alias _x15) = q{ mixin(quarterRound!(%1$s, %2$s, %3$s, %4$s)); mixin(quarterRound!(%6$s, %7$s, %8$s, %5$s)); mixin(quarterRound!(%11$s, %12$s, %9$s, %10$s)); mixin(quarterRound!(%16$s, %13$s, %14$s, %15$s)); }.format(__traits(identifier, _x00), __traits(identifier, _x01), __traits(identifier, _x02), __traits(identifier, _x03), __traits(identifier, _x04), __traits(identifier, _x05), __traits(identifier, _x06), __traits(identifier, _x07), __traits(identifier, _x08), __traits(identifier, _x09), __traits(identifier, _x10), __traits(identifier, _x11), __traits(identifier, _x12), __traits(identifier, _x13), __traits(identifier, _x14), __traits(identifier, _x15)); @safe unittest { uint y00 = 0x00000001, y01 = 0x00000000, y02 = 0x00000000, y03 = 0x00000000, y04 = 0x00000001, y05 = 0x00000000, y06 = 0x00000000, y07 = 0x00000000, y08 = 0x00000001, y09 = 0x00000000, y10 = 0x00000000, y11 = 0x00000000, y12 = 0x00000001, y13 = 0x00000000, y14 = 0x00000000, y15 = 0x00000000; uint x00 = 0x08521bd6, x01 = 0x1fe88837, x02 = 0xbb2aa576, x03 = 0x3aa26365, x04 = 0xc54c6a5b, x05 = 0x2fc74c2f, x06 = 0x6dd39cc3, x07 = 0xda0a64f6, x08 = 0x90a2f23d, x09 = 0x067f95a6, x10 = 0x06b35f61, x11 = 0x41e4732e, x12 = 0xe859c100, x13 = 0xea4d84b7, x14 = 0x0f619bff, x15 = 0xbc6e965a; mixin(rowRound!(y00, y01, y02, y03, y04, y05, y06, y07, y08, y09, y10, y11, y12, y13, y14, y15)); mixin(rowRound!(x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15)); immutable uint[16] test0 = [y00, y01, y02, y03, y04, y05, y06, y07, y08, y09, y10, y11, y12, y13, y14, y15]; immutable uint[16] test1 = [x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15]; assert(test0 == [0x08008145, 0x00000080, 0x00010200, 0x20500000, 0x20100001, 0x00048044, 0x00000080, 0x00010000, 0x00000001, 0x00002000, 0x80040000, 0x00000000, 0x00000001, 0x00000200, 0x00402000, 0x88000100]); assert(test1 == [0xa890d39d, 0x65d71596, 0xe9487daa, 0xc8ca6a86, 0x949d2192, 0x764b7754, 0xe408d9b9, 0x7a41b4d1, 0x3402e183, 0x3c3af432, 0x50669f96, 0xd89ef0a8, 0x0040ede5, 0xb545fbce, 0xd257ed4f, 0x1818882d]); } enum string colRound(alias _x00, alias _x01, alias _x02, alias _x03, alias _x04, alias _x05, alias _x06, alias _x07, alias _x08, alias _x09, alias _x10, alias _x11, alias _x12, alias _x13, alias _x14, alias _x15,) = q{ mixin(quarterRound!(%1$s, %5$s, %9$s, %13$s)); mixin(quarterRound!(%6$s, %10$s, %14$s, %2$s)); mixin(quarterRound!(%11$s, %15$s, %3$s, %7$s)); mixin(quarterRound!(%16$s, %4$s, %8$s, %12$s)); }.format(__traits(identifier, _x00), __traits(identifier, _x01), __traits(identifier, _x02), __traits(identifier, _x03), __traits(identifier, _x04), __traits(identifier, _x05), __traits(identifier, _x06), __traits(identifier, _x07), __traits(identifier, _x08), __traits(identifier, _x09), __traits(identifier, _x10), __traits(identifier, _x11), __traits(identifier, _x12), __traits(identifier, _x13), __traits(identifier, _x14), __traits(identifier, _x15)); @safe unittest { uint y00 = 0x00000001, y01 = 0x00000000, y02 = 0x00000000, y03 = 0x00000000, y04 = 0x00000001, y05 = 0x00000000, y06 = 0x00000000, y07 = 0x00000000, y08 = 0x00000001, y09 = 0x00000000, y10 = 0x00000000, y11 = 0x00000000, y12 = 0x00000001, y13 = 0x00000000, y14 = 0x00000000, y15 = 0x00000000; uint x00 = 0x08521bd6, x01 = 0x1fe88837, x02 = 0xbb2aa576, x03 = 0x3aa26365, x04 = 0xc54c6a5b, x05 = 0x2fc74c2f, x06 = 0x6dd39cc3, x07 = 0xda0a64f6, x08 = 0x90a2f23d, x09 = 0x067f95a6, x10 = 0x06b35f61, x11 = 0x41e4732e, x12 = 0xe859c100, x13 = 0xea4d84b7, x14 = 0x0f619bff, x15 = 0xbc6e965a; mixin(colRound!(y00, y01, y02, y03, y04, y05, y06, y07, y08, y09, y10, y11, y12, y13, y14, y15)); mixin(colRound!(x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15)); immutable uint[16] test0 = [y00, y01, y02, y03, y04, y05, y06, y07, y08, y09, y10, y11, y12, y13, y14, y15]; immutable uint[16] test1 = [x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15]; assert(test0 == [0x10090288, 0x00000000, 0x00000000, 0x00000000, 0x00000101, 0x00000000, 0x00000000, 0x00000000, 0x00020401, 0x00000000, 0x00000000, 0x00000000, 0x40a04001, 0x00000000, 0x00000000, 0x00000000]); assert(test1 == [0x8c9d190a, 0xce8e4c90, 0x1ef8e9d3, 0x1326a71a, 0x90a20123, 0xead3c4f3, 0x63a091a0, 0xf0708d69, 0x789b010c, 0xd195a681, 0xeb7d5504, 0xa774135c, 0x481c2027, 0x53a8e4b5, 0x4c1f89c5, 0x3f78c9c8]); } ubyte[64] salsa20(in ubyte[64] input) pure nothrow @safe @nogc { auto x00 = littleEndian(input[00..04]), x01 = littleEndian(input[04..08]), x02 = littleEndian(input[08..12]), x03 = littleEndian(input[12..16]), x04 = littleEndian(input[16..20]), x05 = littleEndian(input[20..24]), x06 = littleEndian(input[24..28]), x07 = littleEndian(input[28..32]), x08 = littleEndian(input[32..36]), x09 = littleEndian(input[36..40]), x10 = littleEndian(input[40..44]), x11 = littleEndian(input[44..48]), x12 = littleEndian(input[48..52]), x13 = littleEndian(input[52..56]), x14 = littleEndian(input[56..60]), x15 = littleEndian(input[60..64]); auto y00 = x00, y01 = x01, y02 = x02, y03 = x03, y04 = x04, y05 = x05, y06 = x06, y07 = x07, y08 = x08, y09 = x09, y10 = x10, y11 = x11, y12 = x12, y13 = x13, y14 = x14, y15 = x15; foreach (i; 0..10) { mixin(colRound!(x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15)); mixin(rowRound!(x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15)); } return concat!(ubyte[64])(littleEndianInv(x00 + y00), littleEndianInv(x01 + y01), littleEndianInv(x02 + y02), littleEndianInv(x03 + y03), littleEndianInv(x04 + y04), littleEndianInv(x05 + y05), littleEndianInv(x06 + y06), littleEndianInv(x07 + y07), littleEndianInv(x08 + y08), littleEndianInv(x09 + y09), littleEndianInv(x10 + y10), littleEndianInv(x11 + y11), littleEndianInv(x12 + y12), littleEndianInv(x13 + y13), littleEndianInv(x14 + y14), littleEndianInv(x15 + y15)); } @safe unittest { ubyte[64] test0 = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; test0 = salsa20(test0); ubyte[64] test1 = [211,159, 13,115, 76, 55, 82,183, 3,117,222, 37,191,187,234,136, 49,237,179, 48, 1,106,178,219,175,199,166, 48, 86, 16,179,207, 31,240, 32, 63, 15, 83, 93,161,116,147, 48,113,238, 55,204, 36, 79,201,235, 79, 3, 81,156, 47,203, 26,244,243, 88,118,104, 54]; test1 = salsa20(test1); ubyte[64] test2 = [ 88,118,104, 54, 79,201,235, 79, 3, 81,156, 47,203, 26,244,243, 191,187,234,136,211,159, 13,115, 76, 55, 82,183, 3,117,222, 37, 86, 16,179,207, 49,237,179, 48, 1,106,178,219,175,199,166, 48, 238, 55,204, 36, 31,240, 32, 63, 15, 83, 93,161,116,147, 48,113]; test2 = salsa20(test2); ubyte[64] test3 = [ 6,124, 83,146, 38,191, 9, 50, 4,161, 47,222,122,182,223,185, 75, 27, 0,216, 16,122, 7, 89,162,104,101,147,213, 21, 54, 95, 225,253,139,176,105,132, 23,116, 76, 41,176,207,221, 34,157,108, 94, 94, 99, 52, 90,117, 91,220,146,190,239,143,196,176,130,186]; foreach (i; 0..1_000_000) test3 = salsa20(test3); assert(test0 == [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]); assert(test1 == [109, 42,178,168,156,240,248,238,168,196,190,203, 26,110,170,154, 29, 29,150, 26,150, 30,235,249,190,163,251, 48, 69,144, 51, 57, 118, 40,152,157,180, 57, 27, 94,107, 42,236, 35, 27,111,114,114, 219,236,232,135,111,155,110, 18, 24,232, 95,158,179, 19, 48,202]); assert(test2 == [179, 19, 48,202,219,236,232,135,111,155,110, 18, 24,232, 95,158, 26,110,170,154,109, 42,178,168,156,240,248,238,168,196,190,203, 69,144, 51, 57, 29, 29,150, 26,150, 30,235,249,190,163,251, 48, 27,111,114,114,118, 40,152,157,180, 57, 27, 94,107, 42,236, 35]); assert(test3 == [ 8, 18, 38,199,119, 76,215, 67,173,127,144,162,103,212,176,217, 192, 19,233, 33,159,197,154,160,128,243,219, 65,171,136,135,225, 123, 11, 68, 86,237, 82, 20,155,133,189, 9, 83,167,116,194, 78, 122,127,195,185,185,204,188, 90,245, 9,183,248,226, 85,245,104]); } static immutable ubyte[4] sigma0 = [101, 120, 112, 97]; static immutable ubyte[4] sigma1 = [110, 100, 32, 51]; static immutable ubyte[4] sigma2 = [ 50, 45, 98, 121]; static immutable ubyte[4] sigma3 = [116, 101, 32, 107]; ubyte[64] salsa20Exp(in ref ubyte[32] key, in ubyte[16] n) @safe pure nothrow @nogc { return salsa20(concat!(ubyte[64])(sigma0, key[0..16], sigma1, n, sigma2, key[16..$], sigma3)); } @safe unittest { immutable ubyte[32] key = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 201,202,203,204,205,206,207,208, 209,210,211,212,213,214,215,216]; immutable ubyte[16] n = [101,102,103,104,105,106,107,108, 109,110,111,112,113,114,115,116]; assert(salsa20Exp(key, n) == [ 69, 37, 68, 39, 41, 15,107,193,255,139,122, 6,170,233,217, 98, 89,144,182,106, 21, 51,200, 65,239, 49,222, 34,215,114, 40,126, 104,197, 7,225,197,153, 31, 2,102, 78, 76,176, 84,245,246,184, 177,160,133,130, 6, 72,149,119,192,195,132,236,234,103,246, 74]); }