621 lines
16 KiB
JavaScript
621 lines
16 KiB
JavaScript
(function() {
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var Nr = 10;
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// convert two-dimensional indicies to one-dim array indices
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var I00 = 0;
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var I01 = 1;
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var I02 = 2;
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var I03 = 3;
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var I10 = 4;
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var I11 = 5;
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var I12 = 6;
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var I13 = 7;
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var I20 = 8;
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var I21 = 9;
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var I22 = 10;
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var I23 = 11;
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var I30 = 12;
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var I31 = 13;
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var I32 = 14;
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var I33 = 15;
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// S-Box substitution table
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var S_enc = new Array(
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
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0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
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0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
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0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
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0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
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0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
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0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
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0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
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0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
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0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
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0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
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0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
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0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
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0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
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0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
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0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
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0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16);
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// inverse S-Box for decryptions
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var S_dec = new Array(
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
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0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
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0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
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0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
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0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
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0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
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0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
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0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
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0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
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0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
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0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
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0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
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0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
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0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
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0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
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0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
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0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d);
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function cvt_hex8 (val) {
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var vh = (val>>>4)&0x0f;
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return vh.toString(16) + (val&0x0f).toString(16);
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}
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function cvt_byte (str) {
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// get the first hex digit
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var val1 = str.charCodeAt(0);
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// do some error checking
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if (val1 >= 48 && val1 <= 57) {
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// have a valid digit 0-9
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val1 -= 48;
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} else if (val1 >= 65 && val1 <= 70) {
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// have a valid digit A-F
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val1 -= 55;
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} else if (val1 >= 97 && val1 <= 102) {
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// have a valid digit A-F
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val1 -= 87;
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} else {
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// not 0-9 or A-F, complain
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console.log( str.charAt(1)+" is not a valid hex digit" );
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return -1;
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}
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// get the second hex digit
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var val2 = str.charCodeAt(1);
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// do some error checking
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if ( val2 >= 48 && val2 <= 57 ) {
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// have a valid digit 0-9
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val2 -= 48;
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} else if ( val2 >= 65 && val2 <= 70 ) {
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// have a valid digit A-F
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val2 -= 55;
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} else if ( val2 >= 97 && val2 <= 102 ) {
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// have a valid digit A-F
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val2 -= 87;
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} else {
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// not 0-9 or A-F, complain
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console.log( str.charAt(2)+" is not a valid hex digit" );
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return -1;
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}
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// all is ok, return the value
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return val1*16 + val2;
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}
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// conversion function for non-constant subscripts
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// assume subscript range 0..3
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function I(x,y) {
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return (x*4) + y;
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}
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// remove spaces from input
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function remove_spaces(instr) {
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var i;
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var outstr = "";
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for(i=0; i<instr.length; i++) {
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if ( instr.charAt(i) != " " )
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// not a space, include it
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outstr += instr.charAt(i);
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}
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return outstr;
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}
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// get the message to encrypt/decrypt or the key
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// return as a 16-byte array
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function get_value(str, isASCII) {
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var dbyte = new Array(16);
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var i;
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var val; // one hex digit
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if (isASCII) {
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// check length of data
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if (str.length > 16) {
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console.log("is too long, using the first 16 ASCII characters" );
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}
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// have ASCII data
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// 16 characters?
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if (str.length >= 16) {
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// 16 or more characters
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for(i=0; i<16; i++) {
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dbyte[i] = str.charCodeAt(i);
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}
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} else {
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// less than 16 characters - fill with NULLs
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for(i=0; i<str.length; i++) {
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dbyte[i] = str.charCodeAt(i);
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}
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for( i=str.length; i<16; i++) {
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dbyte[i] = 0;
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}
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}
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} else {
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// have hex data - remove any spaces they used, then convert
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//str = remove_spaces(str);
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// check length of data
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if ( str.length != 32 ) {
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//console.log("\tget_value:\tstr = " + str + "\tisASCII = " + isASCII); //isASCII = false
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console.log("length wrong: Is " + str.length + " hex digits, but must be 128 bits (32 hex digits)");
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dbyte[0] = -1;
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return dbyte;
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}
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for( i=0; i<16; i++ ) {
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// isolate and convert this substring
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dbyte[i] = cvt_byte( str.substr(i*2,2) );
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if( dbyte[i] < 0 ) {
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// have an error
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dbyte[0] = -1;
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return dbyte;
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}
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}
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}
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// return successful conversion
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return dbyte;
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}
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//do the AES GF(2**8) multiplication
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// do this by the shift-and-"add" approach
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function aes_mul(a, b) {
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var res = 0;
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while(a > 0) {
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if((a&1) != 0)
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res = res ^ b; // "add" to the result
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a >>>= 1; // shift a to get next higher-order bit
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b <<= 1; // shift multiplier also
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}
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// now reduce it modulo x**8 + x**4 + x**3 + x + 1
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var hbit = 0x10000; // bit to test if we need to take action
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var modulus = 0x11b00; // modulus - XOR by this to change value
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while(hbit >= 0x100) {
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if ((res & hbit) != 0) {
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res ^= modulus; // XOR with the modulus
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}
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// prepare for the next loop
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hbit >>= 1;
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modulus >>= 1;
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}
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return res;
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}
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// apply the S-box substitution to the key expansion
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function SubWord(word_ary) {
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var i;
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for(i=0; i<16; i++) {
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word_ary[i] = S_enc[word_ary[i]];
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}
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return word_ary;
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}
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// rotate the bytes in a word
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function RotWord(word_ary) {
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return new Array(word_ary[1], word_ary[2], word_ary[3], word_ary[0]);
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}
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// calculate the first item Rcon[i] = { x^(i-1), 0, 0, 0 }
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// note we only return the first item
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function Rcon(exp) {
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var val = 2;
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var result = 1;
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// remember to calculate x^(exp-1)
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exp--;
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// process the exponent using normal shift and multiply
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while ( exp > 0 )
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{
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if ( (exp & 1) != 0 )
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result = aes_mul( result, val );
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// square the value
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val = aes_mul( val, val );
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// move to the next bit
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exp >>= 1;
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}
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return result;
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}
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// round key generation
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// return a byte array with the expanded key information
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function key_expand( key )
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{
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var temp = new Array(4);
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var i, j;
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var w = new Array(4*(Nr+1));
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// copy initial key stuff
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for( i=0; i<16; i++ )
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{
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w[i] = key[i];
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}
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// generate rest of key schedule using 32-bit words
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i = 4;
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while ( i < 4*(Nr+1)) // blocksize * ( rounds + 1 )
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{
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// copy word W[i-1] to temp
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for( j=0; j<4; j++ )
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temp[j] = w[(i-1)*4+j];
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if ( i % 4 == 0)
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{
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// temp = SubWord(RotWord(temp)) ^ Rcon[i/4];
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temp = RotWord( temp );
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temp = SubWord( temp );
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temp[0] ^= Rcon( i>>>2 );
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}
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// word = word ^ temp
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for( j=0; j<4; j++ )
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w[i*4+j] = w[(i-4)*4+j] ^ temp[j];
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i++;
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}
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return w;
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}
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// do S-Box substitution
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function SubBytes(state, Sbox)
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{
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var i;
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for( i=0; i<16; i++ )
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state[i] = Sbox[ state[i] ];
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return state;
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}
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// shift each row as appropriate
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function ShiftRows(state)
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{
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var t0, t1, t2, t3;
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// top row (row 0) isn't shifted
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// next row (row 1) rotated left 1 place
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t0 = state[I10];
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t1 = state[I11];
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t2 = state[I12];
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t3 = state[I13];
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state[I10] = t1;
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state[I11] = t2;
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state[I12] = t3;
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state[I13] = t0;
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// next row (row 2) rotated left 2 places
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t0 = state[I20];
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t1 = state[I21];
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t2 = state[I22];
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t3 = state[I23];
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state[I20] = t2;
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state[I21] = t3;
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state[I22] = t0;
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state[I23] = t1;
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// bottom row (row 3) rotated left 3 places
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t0 = state[I30];
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t1 = state[I31];
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t2 = state[I32];
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t3 = state[I33];
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state[I30] = t3;
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state[I31] = t0;
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state[I32] = t1;
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state[I33] = t2;
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return state;
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}
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// inverset shift each row as appropriate
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function InvShiftRows(state)
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{
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var t0, t1, t2, t3;
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// top row (row 0) isn't shifted
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// next row (row 1) rotated left 1 place
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t0 = state[I10];
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t1 = state[I11];
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t2 = state[I12];
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t3 = state[I13];
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state[I10] = t3;
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state[I11] = t0;
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state[I12] = t1;
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state[I13] = t2;
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// next row (row 2) rotated left 2 places
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t0 = state[I20];
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t1 = state[I21];
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t2 = state[I22];
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t3 = state[I23];
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state[I20] = t2;
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state[I21] = t3;
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state[I22] = t0;
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state[I23] = t1;
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// bottom row (row 3) rotated left 3 places
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t0 = state[I30];
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t1 = state[I31];
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t2 = state[I32];
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t3 = state[I33];
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state[I30] = t1;
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state[I31] = t2;
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state[I32] = t3;
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state[I33] = t0;
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return state;
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}
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// process column info
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function MixColumns(state)
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{
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var col;
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var c0, c1, c2, c3;
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for( col=0; col<4; col++ )
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{
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c0 = state[I(0,col)];
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c1 = state[I(1,col)];
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c2 = state[I(2,col)];
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c3 = state[I(3,col)];
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// do mixing, and put back into array
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state[I(0,col)] = aes_mul(2,c0) ^ aes_mul(3,c1) ^ c2 ^ c3;
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state[I(1,col)] = c0 ^ aes_mul(2,c1) ^ aes_mul(3,c2) ^ c3;
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state[I(2,col)] = c0 ^ c1 ^ aes_mul(2,c2) ^ aes_mul(3,c3);
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state[I(3,col)] = aes_mul(3,c0) ^ c1 ^ c2 ^ aes_mul(2,c3);
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}
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return state;
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}
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// inverse process column info
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function InvMixColumns(state)
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{
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var col;
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var c0, c1, c2, c3;
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for( col=0; col<4; col++ )
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{
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c0 = state[I(0,col)];
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c1 = state[I(1,col)];
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c2 = state[I(2,col)];
|
|
c3 = state[I(3,col)];
|
|
|
|
// do inverse mixing, and put back into array
|
|
state[I(0,col)] = aes_mul(0x0e,c0) ^ aes_mul(0x0b,c1)
|
|
^ aes_mul(0x0d,c2) ^ aes_mul(0x09,c3);
|
|
state[I(1,col)] = aes_mul(0x09,c0) ^ aes_mul(0x0e,c1)
|
|
^ aes_mul(0x0b,c2) ^ aes_mul(0x0d,c3);
|
|
state[I(2,col)] = aes_mul(0x0d,c0) ^ aes_mul(0x09,c1)
|
|
^ aes_mul(0x0e,c2) ^ aes_mul(0x0b,c3);
|
|
state[I(3,col)] = aes_mul(0x0b,c0) ^ aes_mul(0x0d,c1)
|
|
^ aes_mul(0x09,c2) ^ aes_mul(0x0e,c3);
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
// insert subkey information
|
|
function AddRoundKey( state, w, base )
|
|
{
|
|
var col;
|
|
|
|
for( col=0; col<4; col++ )
|
|
{
|
|
state[I(0,col)] ^= w[base+col*4];
|
|
state[I(1,col)] ^= w[base+col*4+1];
|
|
state[I(2,col)] ^= w[base+col*4+2];
|
|
state[I(3,col)] ^= w[base+col*4+3];
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
// return a transposed array
|
|
function transpose( msg )
|
|
{
|
|
var row, col;
|
|
var state = new Array( 16 );
|
|
|
|
for( row=0; row<4; row++ )
|
|
for( col=0; col<4; col++ )
|
|
state[I(row,col)] = msg[I(col,row)];
|
|
|
|
return state;
|
|
}
|
|
|
|
// final AES state
|
|
var AES_output = new Array(16);
|
|
|
|
// format AES output
|
|
// -- uses the global array DES_output
|
|
function format_AES_output(bASCII)
|
|
{
|
|
var i;
|
|
var bits;
|
|
var str="";
|
|
|
|
// what type of data do we have to work with?
|
|
if (bASCII)
|
|
{
|
|
// convert each set of bits back to ASCII
|
|
for( i=0; i<16; i++ )
|
|
str += String.fromCharCode( AES_output[i] );
|
|
}
|
|
else
|
|
{
|
|
// output hexdecimal data (insert spaces)
|
|
str = cvt_hex8( AES_output[0] );
|
|
for( i=1; i<16; i++ )
|
|
{
|
|
str += "" + cvt_hex8( AES_output[i] );
|
|
}
|
|
}
|
|
return str;
|
|
}
|
|
|
|
// do encrytion
|
|
function aes_encrypt(str, key, bASCII)
|
|
{
|
|
//console.log(" aes_encrypt:\tstr = " + str + "\tkey = " + key + "\t bASCII = " + bASCII);
|
|
var w = new Array( 4*(Nr+1) ); // subkey information
|
|
var state = new Array( 16 ); // working state
|
|
var round;
|
|
|
|
//accumulated_output_info = "";
|
|
|
|
// get the message from the user
|
|
// also check if it is ASCII or hex
|
|
var msg = get_value(str, bASCII);
|
|
|
|
// problems??
|
|
if ( msg[0] < 0 )
|
|
{
|
|
return;
|
|
}
|
|
|
|
// get the key from the user
|
|
var key = get_value(key, false);
|
|
// problems??
|
|
if ( key[0] < 0 )
|
|
{
|
|
return;
|
|
}
|
|
|
|
// expand the key
|
|
w = key_expand( key );
|
|
|
|
// initial state = message in columns (transposed from what we input)
|
|
state = transpose( msg );
|
|
|
|
// display the round key - Transpose due to the way it is stored/used
|
|
state = AddRoundKey(state, w, 0);
|
|
|
|
for( round=1; round<Nr; round++ )
|
|
{
|
|
state = SubBytes(state, S_enc);
|
|
state = ShiftRows(state);
|
|
state = MixColumns(state);
|
|
// display the round key - Transpose due to the way it is stored/used
|
|
// note here the spec uses 32-bit words, we are using bytes, so an extra *4
|
|
state = AddRoundKey(state, w, round*4*4);
|
|
}
|
|
|
|
SubBytes(state, S_enc);
|
|
ShiftRows(state);
|
|
AddRoundKey(state, w, Nr*4*4);
|
|
|
|
// process output
|
|
AES_output = transpose( state );
|
|
var szOutput = format_AES_output(!bASCII);
|
|
return szOutput;
|
|
}
|
|
|
|
// do decryption
|
|
function aes_decrypt(str, key, bASCII)
|
|
{
|
|
//console.log(" aes_decrypt:\tstr = " + str + "\tkey = " + key + "\tbASCII = " + bASCII);
|
|
var w = new Array( 4*(Nr+1) ); // subkey information
|
|
var state = new Array( 16 ); // working state
|
|
var round;
|
|
|
|
//accumulated_output_info = "";
|
|
|
|
// get the message from the user
|
|
// also check if it is ASCII or hex
|
|
var msg = get_value(str, bASCII);
|
|
|
|
// problems??
|
|
if ( msg[0] < 0 )
|
|
{
|
|
return;
|
|
}
|
|
|
|
// get the key from the user
|
|
var key = get_value(key, false);
|
|
// problems??
|
|
if ( key[0] < 0 )
|
|
{
|
|
return;
|
|
}
|
|
|
|
// expand the key
|
|
w = key_expand( key );
|
|
|
|
// initial state = message
|
|
state = transpose( msg );
|
|
// display the round key - Transpose due to the way it is stored/used
|
|
state = AddRoundKey(state, w, Nr*4*4);
|
|
|
|
for( round=Nr-1; round>=1; round-- )
|
|
{
|
|
state = InvShiftRows(state);
|
|
state = SubBytes(state, S_dec);
|
|
// display the round key - Transpose due to the way it is stored/used
|
|
// note here the spec uses 32-bit words, we are using bytes, so an extra *4
|
|
state = AddRoundKey(state, w, round*4*4);
|
|
state = InvMixColumns(state);
|
|
}
|
|
|
|
InvShiftRows(state);
|
|
SubBytes(state, S_dec);
|
|
AddRoundKey(state, w, 0);
|
|
|
|
// process output
|
|
AES_output = transpose( state );
|
|
var szOutput = format_AES_output(!bASCII);
|
|
return szOutput;
|
|
}
|
|
window.aes_encrypt = aes_encrypt;
|
|
window.aes_decrypt = aes_decrypt;
|
|
window.console = window.console || {
|
|
log: function() {}
|
|
};
|
|
}()); |