Main step of GOST 28147-89: Difference between revisions

=={{header|Wren}}==

{{trans|Go}}

<lang ecmascript>class GOST {

// assumes 's' is an 8 x 16 integer array

construct new(s) {

_k87 = List.filled(256, 0)

_k65 = List.filled(256, 0)

_k43 = List.filled(256, 0)

_k21 = List.filled(256, 0)

_enc = List.filled(8, 0)

for (i in 0..255) {

_k87[i] = s[7][i>>4]<<4 | s[6][i&15]

_k65[i] = s[5][i>>4]<<4 | s[4][i&15]

_k43[i] = s[3][i>>4]<<4 | s[2][i&15]

_k21[i] = s[1][i>>4]<<4 | s[0][i&15]

}

}

enc { _enc }

f(x) {

x = _k87[x>>24&255]<<24 | _k65[x>>16&255]<<16 | _k43[x>>8&255]<<8 | _k21[x&255]

return x<<11 | x>>(32-11)

}

mainStep(input, key) {

var key32 = GOST.u32(key)

var input1 = GOST.u32(input[0...4])

var input2 = GOST.u32(input[4..-1])

GOST.b4(f(key32+input1)^input2, enc)

for (i in 0..3) enc[i + 4] = input[i]

}

static u32(b) { b[0] | b[1]<<8 | b[2]<<16 | b[3]<<24 }

static b4(u, b) {

b[0] = u & 0xff

b[1] = (u >> 8) & 0xff

b[2] = (u >> 16) & 0xff

b[3] = (u >> 24) & 0xff

}

}

var hexDigits = "0123456789abcdef"

var toHexByte = Fn.new { |x|

x = x & 0xff

if (x == 0) return "00"

var hex = ""

while (x > 0) {

hex = hex + "%(hexDigits[x%16])"

x = (x/16).floor

}

if (hex.count == 2) return hex[1..0]

return "0" + hex

}

var cbrf = [

[ 4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3],

[14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9],

[ 5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11],

[ 7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3],

[ 6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2],

[ 4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14],

[13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12],

[ 1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12]

]

var input = [0x21, 0x04, 0x3b, 0x04, 0x30, 0x04, 0x32, 0x04]

var key = [0xf9, 0x04, 0xc1, 0xe2]

var g = GOST.new(cbrf)

g.mainStep(input, key)

for (b in g.enc) System.write("[%(toHexByte.call(b))]")

System.print()</lang>

{{out}}

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[1f][88][cf][07][21][04][3b][04]

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