2. JSP 테스트 페이지 만들기
Android WebView에서 우리가 만든 JSP 파일을 로드해서 사용할텐데
로드된 페이지에서 전송할 파라미터 암호화를 안한다면 컨텐츠의 노출 위험이 있다.
그래서 암복호화 클래스를 만들어서 서버와 안드로이드에 로드하는 과정을 추가한다.
( Web에서 파라미터 암호화 -> Android에서 파라미터 복호화)
암복호화 클래스
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 | package com.test.decodeparam; import java.util.Date; public class Decrypt { public static void main(String[] args) { Decrypt dec = new Decrypt(); // TODO Auto-generated method stub String Text = "TEST"; System.out.println(Text); String strEncText = dec.AESEncrypt(Text, "Key"); System.out.println(strEncText); String strDecText = dec.AESDecrypt(strEncText, "Key"); System.out.println(strDecText); } String g_strBase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; byte g_byArrSbox[] = {0x63,0x7c,0x77,0x7b,-14,0x6b,0x6f,-59,0x30,0x01,0x67,0x2b,-2,-41,-85,0x76, -54,-126,-55,0x7d,-6,0x59,0x47,-16,-83,-44,-94,-81,-100,-92,0x72,-64, -73,-3,-109,0x26,0x36,0x3f,-9,-52,0x34,-91,-27,-15,0x71,-40,0x31,0x15, 0x04,-57,0x23,-61,0x18,-106,0x05,-102,0x07,0x12,-128,-30,-21,0x27,-78,0x75, 0x09,-125,0x2c,0x1a,0x1b,0x6e,0x5a,-96,0x52,0x3b,-42,-77,0x29,-29,0x2f,-124, 0x53,-47,0x00,-19,0x20,-4,-79,0x5b,0x6a,-53,-66,0x39,0x4a,0x4c,0x58,-49, -48,-17,-86,-5,0x43,0x4d,0x33,-123,0x45,-7,0x02,0x7f,0x50,0x3c,-97,-88, 0x51,-93,0x40,-113,-110,-99,0x38,-11,-68,-74,-38,0x21,0x10,-1,-13,-46, -51,0x0c,0x13,-20,0x5f,-105,0x44,0x17,-60,-89,0x7e,0x3d,0x64,0x5d,0x19,0x73, 0x60,-127,0x4f,-36,0x22,0x2a,-112,-120,0x46,-18,-72,0x14,-34,0x5e,0x0b,-37, -32,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,-62,-45,-84,0x62,-111,-107,-28,0x79, -25,-56,0x37,0x6d,-115,-43,0x4e,-87,0x6c,0x56,-12,-22,0x65,0x7a,-82,0x08, -70,0x78,0x25,0x2e,0x1c,-90,-76,-58,-24,-35,0x74,0x1f,0x4b,-67,-117,-118, 0x70,0x3e,-75,0x66,0x48,0x03,-10,0x0e,0x61,0x35,0x57,-71,-122,-63,0x1d,-98, -31,-8,-104,0x11,0x69,-39,-114,-108,-101,0x1e,-121,-23,-50,0x55,0x28,-33, -116,-95,-119,0x0d,-65,-26,0x42,0x68,0x41,-103,0x2d,0x0f,-80,0x54,-69,0x16}; byte g_byArrRcon[][] = {{0x00, 0x00, 0x00, 0x00}, {0x01, 0x00, 0x00, 0x00}, {0x02, 0x00, 0x00, 0x00}, {0x04, 0x00, 0x00, 0x00}, {0x08, 0x00, 0x00, 0x00}, {0x10, 0x00, 0x00, 0x00}, {0x20, 0x00, 0x00, 0x00}, {0x40, 0x00, 0x00, 0x00}, {-128, 0x00, 0x00, 0x00}, {0x1b, 0x00, 0x00, 0x00}, {0x36, 0x00, 0x00, 0x00}}; public byte[] RotWord(byte[] byArrInput) { byte byArrRet[] = new byte[4]; byArrRet[0] = byArrInput[1]; byArrRet[1] = byArrInput[2]; byArrRet[2] = byArrInput[3]; byArrRet[3] = byArrInput[0]; return byArrRet; } public void SubWord(byte[] byArr) { for (int nLoop = 0; nLoop < 4; nLoop++) { if (byArr[nLoop] < 0) byArr[nLoop] = g_byArrSbox[byArr[nLoop] + 256]; else byArr[nLoop] = g_byArrSbox[byArr[nLoop]]; } } public ByteArrayRet KeyExpansion(ByteArrayRet barInput) { ByteArrayRet ret = new ByteArrayRet(); ret.nLength = 176; int nBlockSie = 4; int nKeyLength = 4; int nRound = 10; int nLoop; int nLoop2; // 앞 16 바이트 베끼기 for (nLoop = 0; nLoop < 16; nLoop++) ret.byArray[nLoop] = barInput.byArray[nLoop]; byte byArrTemp[] = new byte[4]; byte byArrTemp2[] = new byte[4]; for (nLoop = nKeyLength; nLoop < 44; nLoop++) { for (nLoop2 = 0; nLoop2 < 4; nLoop2++) byArrTemp[nLoop2] = ret.byArray[(nLoop - 1) * 4 + nLoop2]; if ((nLoop % nKeyLength) == 0) { byArrTemp2 = RotWord(byArrTemp); SubWord(byArrTemp2); for (nLoop2 = 0; nLoop2 < 4; nLoop2++) { Integer nConvert = byArrTemp2[nLoop2] ^ g_byArrRcon[nLoop / nKeyLength][nLoop2]; byArrTemp[nLoop2] = nConvert.byteValue(); } } for (nLoop2 = 0; nLoop2 < 4; nLoop2++) { Integer nConvert = ret.byArray[(nLoop - nKeyLength) * 4 + nLoop2] ^ byArrTemp[nLoop2]; ret.byArray[nLoop * 4 + nLoop2] = nConvert.byteValue(); } } return ret; } public ByteArrayRet EncodeUTF8(String strInput) { ByteArrayRet ret = new ByteArrayRet(); int nOneChar; for (int nLoop = 0; nLoop < strInput.length(); nLoop++) { nOneChar = (int)strInput.charAt(nLoop); if (nOneChar < 0x80) ret.byArray[ret.nLength++] = (byte)nOneChar; else if (nOneChar < 0x800) { ret.byArray[ret.nLength++] = (byte)(0xc0 | nOneChar >> 6); ret.byArray[ret.nLength++] = (byte)(0x80 | nOneChar & 0x3f); } else { ret.byArray[ret.nLength++] = (byte)(0xe0 | nOneChar >> 12); ret.byArray[ret.nLength++] = (byte)(0x80 | nOneChar >> 6 & 0x3f); ret.byArray[ret.nLength++] = (byte)(0x80 | nOneChar & 0x3f); } } return ret; } public ByteArrayRet DecodeUTF8(ByteArrayRet barArg) { ByteArrayRet ret = new ByteArrayRet(); int nDivide; for (int nLoop = 0; nLoop < barArg.nLength; nLoop++) { //if (barArg.byArray[nLoop] < 0x80) if (barArg.byArray[nLoop] >= 0) { ret.byArray[ret.nLength++] = barArg.byArray[nLoop]; ret.byArray[ret.nLength++] = 0; } else { //if ((0xc0 <= barArg.byArray[nLoop]) && (barArg.byArray[nLoop] <= 0xdf) && (0x80 <= barArg.byArray[nLoop + 1]) && (barArg.byArray[nLoop + 1] <= 0xbf)) if ((-64 <= barArg.byArray[nLoop]) && (barArg.byArray[nLoop] <= -33) && (0 > barArg.byArray[nLoop + 1]) && (barArg.byArray[nLoop + 1] >= -65)) { nDivide = ((barArg.byArray[nLoop++] & 0x1f) << 6) | (barArg.byArray[nLoop] & 0x3f); ret.byArray[ret.nLength++] = (byte)nDivide; nDivide = nDivide >> 8; ret.byArray[ret.nLength++] = (byte)nDivide; } else { //if ((0xe0 <= barArg.byArray[nLoop]) && (barArg.byArray[nLoop] <= 0xef) && (0x80 <= barArg.byArray[nLoop + 1]) && (barArg.byArray[nLoop + 1] <= 0xbf) && (0x80 <= barArg.byArray[nLoop + 2]) && (barArg.byArray[nLoop + 2] <= 0xbf)) if ((-32 <= barArg.byArray[nLoop]) && (barArg.byArray[nLoop] <= -17) && (-65 >= barArg.byArray[nLoop + 1]) && (-65 >= barArg.byArray[nLoop + 2])) { nDivide = ((barArg.byArray[nLoop++] & 0xf) << 12) | ((barArg.byArray[nLoop++] & 0x3f) << 6) | (barArg.byArray[nLoop] & 0x3f); ret.byArray[ret.nLength++] = (byte)nDivide; nDivide = nDivide >> 8; ret.byArray[ret.nLength++] = (byte)nDivide; } } } // 이거 넣으면 어떨까? if ((ret.byArray[ret.nLength - 2] == 0) && ((ret.nLength % 2) == 0)) return ret; } return ret; } public class ByteArrayRet { byte byArray[]; int nLength; public ByteArrayRet() { byArray = new byte[1024]; nLength = 0; } public String toString2() { String strRetVal = ""; String strTemp; //strRetVal = this.byArray.toString(); for (int nTemp = 0; nTemp < nLength; nTemp++) { if ((nTemp % 8) == 0) strRetVal += "<br>"; strTemp = Integer.toHexString(byArray[nTemp]); if (strTemp.length() > 2) strRetVal += strTemp.substring(6) + ", "; else if (strTemp.length() == 1) strRetVal += "0" + strTemp + ", "; else strRetVal += strTemp + ", "; } return strRetVal; } } public void AddRoundKey(ByteArrayRet barArg, ByteArrayRet barKey, int nRound, int nArg) { for (int i = 0; i < 4; i++) for (int j = 0; j < nArg; j++){ barArg.byArray[i * 4 + j] ^= barKey.byArray[(nRound * 4 + j) * 4 + i]; } } public void SubBytes(ByteArrayRet barArg, int nArg) { for (int i = 0; i < 4; i++) for (int j = 0; j < nArg; j++){ if (barArg.byArray[i * 4 + j] < 0) barArg.byArray[i * 4 + j] = g_byArrSbox[barArg.byArray[i * 4 + j] + 256]; else barArg.byArray[i * 4 + j] = g_byArrSbox[barArg.byArray[i * 4 + j]]; } } public void ShiftRows(ByteArrayRet barArg, int nArg) { byte byTemp[] = new byte[4]; for (int i = 1; i < 4; i++) { for (int j = 0; j < 4; j++) byTemp[j] = barArg.byArray[i * 4 + (i + j) % nArg]; for (int j = 0; j < 4; j++) barArg.byArray[i * 4 + j] = byTemp[j]; } } public void MixColumns(ByteArrayRet barArg) { byte byTemp1[] = new byte[4]; byte byTemp2[] = new byte[4]; Integer nTemp; for (int i = 0; i < 4; i++) { for (int j = 0; j < 4; j++) { byTemp1[j] = barArg.byArray[j * 4 + i]; nTemp = (( barArg.byArray[j * 4 + i] & 0x80) != 0) ? barArg.byArray[j * 4 + i] << 1 ^ 0x11b : barArg.byArray[j * 4 + i] << 1; byTemp2[j] = nTemp.byteValue(); } nTemp = byTemp2[0] ^ byTemp1[1] ^ byTemp2[1] ^ byTemp1[2] ^ byTemp1[3]; barArg.byArray[0 * 4 + i] = nTemp.byteValue(); nTemp = byTemp1[0] ^ byTemp2[1] ^ byTemp1[2] ^ byTemp2[2] ^ byTemp1[3]; barArg.byArray[1 * 4 + i] = nTemp.byteValue(); nTemp = byTemp1[0] ^ byTemp1[1] ^ byTemp2[2] ^ byTemp1[3] ^ byTemp2[3]; barArg.byArray[2 * 4 + i] = nTemp.byteValue(); nTemp = byTemp1[0] ^ byTemp2[0] ^ byTemp1[1] ^ byTemp1[2] ^ byTemp2[3]; barArg.byArray[3 * 4 + i] = nTemp.byteValue(); } } String EncodeBase64(ByteArrayRet barArg, int nLength) { String strRet = new String(); byte ch1, ch2, ch3; byte nEnc1, nEnc2, nEnc3, nEnc4; int nLoop = 0; do { ch1 = barArg.byArray[nLoop++]; ch2 = (nLoop++ < nLength) ? barArg.byArray[nLoop - 1] : 0; ch3 = (nLoop++ < nLength) ? barArg.byArray[nLoop - 1] : 0; nEnc1 = (byte)((ch1 >> 2) & 0x3f); nEnc2 = (byte)(((ch1 & 3) << 4) | ((ch2 >> 4) & 0x0f)); nEnc3 = (byte)(((ch2 & 15) << 2) | ((ch3 >> 6) & 0x03)); nEnc4 = (byte)(ch3 & 63); switch (nLoop - nLength) { case 1: nEnc4 = (byte)64; break; case 2: nEnc3 = nEnc4 = (byte)64; break; } Character ch = new Character(g_strBase64.charAt(nEnc1)); strRet += ch.toString(); ch = new Character(g_strBase64.charAt(nEnc2)); strRet += ch.toString(); ch = new Character(g_strBase64.charAt(nEnc3)); strRet += ch.toString(); ch = new Character(g_strBase64.charAt(nEnc4)); strRet += ch.toString(); } while (nLoop < nLength); return strRet; } public ByteArrayRet DecodeBase64(String strCipherText) { ByteArrayRet ret = new ByteArrayRet(); ret.nLength = 0; int nEnc1, nEnc2, nEnc3, nEnc4; int ch1, ch2, ch3; int nLoop = 0; do { nEnc1 = g_strBase64.indexOf(strCipherText.charAt(nLoop++)); nEnc2 = g_strBase64.indexOf(strCipherText.charAt(nLoop++)); nEnc3 = g_strBase64.indexOf(strCipherText.charAt(nLoop++)); nEnc4 = g_strBase64.indexOf(strCipherText.charAt(nLoop++)); ch1 = (nEnc1 << 2) | (nEnc2 >> 4); ch2 = ((nEnc2 & 15) << 4 ) | (nEnc3 >> 2); ch3 = ((nEnc3 & 3) << 6) | nEnc4; ret.byArray[ret.nLength++] = (byte)ch1; if (nEnc3 != 64) ret.byArray[ret.nLength++] = (byte)ch2; if (nEnc4 != 64) ret.byArray[ret.nLength++] = (byte)ch3; } while (nLoop < strCipherText.length()); return ret; } public ByteArrayRet Cipher(ByteArrayRet barKey, ByteArrayRet barKE) { ByteArrayRet ret = new ByteArrayRet(); ret.nLength = 16; int nBlockSize = 4; int nRound = 10; int nLoop = 0; ByteArrayRet barState = new ByteArrayRet(); barState.nLength = 16; for (nLoop = 0; nLoop < 16; nLoop++) barState.byArray[(nLoop % 4) * 4 + (int)Math.floor(nLoop / 4)] = barKey.byArray[nLoop]; AddRoundKey(barState, barKE, 0, nBlockSize); for (nLoop = 1; nLoop < nRound; nLoop++) { SubBytes(barState, nBlockSize); ShiftRows(barState, nBlockSize); MixColumns(barState); AddRoundKey(barState, barKE, nLoop, nBlockSize); } SubBytes(barState, nBlockSize); ShiftRows(barState, nBlockSize); AddRoundKey(barState, barKE, nRound, nBlockSize); for (nLoop = 0; nLoop < 4 * nBlockSize; nLoop++) ret.byArray[nLoop] = barState.byArray[(nLoop % 4) * 4 + (int)Math.floor(nLoop / 4)]; return ret; } public String AESEncrypt(String strPlainText, String strPassword) { // strPlainText를 UTF8로 ByteArrayRet barUTF8Text = EncodeUTF8(strPlainText); // strPassword를 UTF8로 ByteArrayRet barUTF8PW = EncodeUTF8(strPassword); // use AES itself to encrypt password to get cipher key (using plain password as source for key expansion) - gives us well encrypted key ByteArrayRet barKey = new ByteArrayRet(); barKey.nLength = 16; barKey.byArray = new byte[16]; int nLoop; for (nLoop = 0; nLoop < 16; nLoop++){ barKey.byArray[nLoop] = /*isNaN(barUTF8PW.byArray[nLoop]) ? 0 : */barUTF8PW.byArray[nLoop]; } // 키 만들기 ByteArrayRet barKE = KeyExpansion(barKey); // 암호화 ByteArrayRet barCipher = Cipher(barKey, barKE); // 시간 알아오기 Date dNow = new Date(); long lCurrentTime = dNow.getTime(); long lTime = lCurrentTime / 1000; byte bySec = (byte)(lTime & 0xFF); /* ///////////////////////////////////////////////////////// lTime = 1239583474; bySec = 34; ///////////////////////////////////////////////////////// */ // initialise counter block (NIST SP800-38A §B.2): millisecond time-stamp for nonce in 1st 8 bytes, block counter in 2nd 8 bytes ByteArrayRet barCounterBlock = new ByteArrayRet(); barCounterBlock.nLength = 16; barCounterBlock.byArray = new byte[16]; // encode nonce with seconds in 1st 4 bytes, and (repeated) ms part filling 2nd 4 bytes for (nLoop = 0; nLoop < 4; nLoop++) { barCounterBlock.byArray[nLoop] = (byte)((lTime >> nLoop * 8) & 0xFF); barCounterBlock.byArray[nLoop + 4] = (byte)(bySec & 0xFF); } // and convert it to a string to go on the front of the ciphertext int nBlockCount = (int)Math.ceil((double)barUTF8Text.nLength / 16); ByteArrayRet barCipherText = new ByteArrayRet(); barCipherText.nLength = nBlockCount * 16 + 8; barCipherText.byArray = new byte[barCipherText.nLength]; barCipherText.byArray[0] = barCounterBlock.byArray[0]; barCipherText.byArray[1] = barCounterBlock.byArray[1]; barCipherText.byArray[2] = barCounterBlock.byArray[2]; barCipherText.byArray[3] = barCounterBlock.byArray[3]; barCipherText.byArray[4] = barCounterBlock.byArray[4]; barCipherText.byArray[5] = barCounterBlock.byArray[5]; barCipherText.byArray[6] = barCounterBlock.byArray[6]; barCipherText.byArray[7] = barCounterBlock.byArray[7]; // generate key schedule - an expansion of the key into distinct Key Rounds for each round ByteArrayRet barKeySchedule = KeyExpansion(barCipher); int nBlockSize = 16; int nBlockLength = 0; int nLoop2 = 0; ByteArrayRet barCipherCntr = new ByteArrayRet(); for (nLoop = 0; nLoop < nBlockCount; nLoop++) { barCounterBlock.byArray[15] = (byte)nLoop; barCipherCntr = Cipher(barCounterBlock, barKeySchedule); nBlockLength = (nLoop < nBlockCount - 1) ? nBlockSize : (barUTF8Text.nLength - 1) % nBlockSize + 1; for (nLoop2 = 0; nLoop2 < nBlockLength; nLoop2++) barCipherText.byArray[nLoop * 16 + nLoop2 + 8] = (byte)(barCipherCntr.byArray[nLoop2] ^ barUTF8Text.byArray[nLoop * nBlockSize + nLoop2]); } return EncodeBase64(barCipherText, (nLoop - 1) * 16 + nLoop2 + 8); //return strRet; } public String AESDecrypt(String strCipherText, String strPassword) { // strCipherText를 Base64 풀기 ByteArrayRet barBase64Dec = DecodeBase64(strCipherText); // strPassword를 UTF8로 ByteArrayRet barUTF8PW = EncodeUTF8(strPassword); // use AES to encrypt password (mirroring encrypt routine) ByteArrayRet barKey = new ByteArrayRet();// byArray barKey.nLength = 16; barKey.byArray = new byte[16]; for (int nLoop = 0; nLoop < 16; nLoop++) barKey.byArray[nLoop] = barUTF8PW.byArray[nLoop]; // 키 만들기 ByteArrayRet barKE = KeyExpansion(barKey);// byKey // 암호화 ByteArrayRet barCipher = Cipher(barKey, barKE);// byCipher // recover nonce from 1st 8 bytes of ciphertext ByteArrayRet barCounterBlock = new ByteArrayRet();// byCounterBlock barCounterBlock.nLength = 16; for (int nLoop = 0; nLoop < 8; nLoop++) barCounterBlock.byArray[nLoop] = barBase64Dec.byArray[nLoop]; // generate key schedule ByteArrayRet barKeySchedule = KeyExpansion(barCipher); int nBlockSize = 16; int nBlocks = (int)Math.ceil((double)(barBase64Dec.nLength - 8) / nBlockSize); ByteArrayRet barUTF8Text = new ByteArrayRet(); //barUTF8Text.nLength = 1024; barUTF8Text.nLength = barBase64Dec.nLength; for (Integer nLoop = 0; nLoop < nBlocks; nLoop++) { barCounterBlock.byArray[15] = nLoop.byteValue(); ByteArrayRet barCipherCntr = Cipher(barCounterBlock, barKeySchedule); for (int nLoop2 = 0; nLoop2 < 16; nLoop2++) { if ((16 * nLoop + nLoop2 + 8) >= barBase64Dec.nLength) break; Integer nConvert = barCipherCntr.byArray[nLoop2] ^ barBase64Dec.byArray[16 * nLoop + nLoop2 + 8]; barUTF8Text.byArray[16 * nLoop + nLoop2] = nConvert.byteValue(); } } // new String (barUTF8Text.byArray) 라고 하지 않고 아래와 같이 하는 것은, 뒤에 붙은 0들 때문에 글자로 바꾸다가 페이지가 죽기 때문이다. int nResultLength = 0; for (int nLoop = 0; nLoop < barUTF8Text.nLength; nLoop++) { if (barUTF8Text.byArray[nLoop] == 0) break; nResultLength++; } byte byResult[] = new byte[nResultLength]; for (int nLoop = 0; nLoop < nResultLength; nLoop++) byResult[nLoop] = barUTF8Text.byArray[nLoop]; String strRet = new String (byResult); return strRet; } } | cs |
* AES 알고리즘 사용
더 강한 알려진 알고리즘을 사용해도 된다. 외부에서 필요한 것은
String strEncText = dec.AESEncrypt(Text, "Key");
String strEncText = dec.AESDecrypt(Text, "Key");
톰캣과 안드로이드에서 가져다 쓸수있게 만들어준다.
Java Class 파일을
1. 톰캣설치경로\webapps\웹프로젝트경로\ 에 복사 ( 위치는 상관없음. 최종적으로 컴파일한 후에 class 파일의 위치가 중요함 )
2. 안드로이드 프로젝트 src에 복사 or Java class 파일을 Jar 파일로 만들어서 안드로이드 프로젝트에 import
웹과 안드로이드 프로젝트 환경에서 가져다 쓸수있도록 한다.
웹에서는 단순하게 cmd를 사용했다.
javac -d . Decrypt.java 해서 컴파일하면
톰캣설치경로\webapps\웹프로젝트경로\com\test\decodeparam\Decrypt.class 가 생성된다. ( 패키지명대로 디렉터리 생성)
java -cp . com.test.decodeparam.Decrypt 해서 실행 확인해본다.
public static void main(String[] args) {Decrypt dec = new Decrypt();// TODO Auto-generated method stubString Text = "TEST";System.out.println(Text);String strEncText = dec.AESEncrypt(Text, "Key");System.out.println(strEncText);String strDecText = dec.AESDecrypt(strEncText, "Key");System.out.println(strDecText)}의 결과는TEST //원문FrshVxYWFhbjM88g //암호화문TEST //복호화문암복호화가 정상적으로 이루어지는 클래스임을 파악했다.
톰캣설치경로\webapps\웹프로젝트경로\에
WEB-INF\classes\ 를 만들고 좀 전에 만든 com 이하 폴더들을 복사해 놓는다.
JSP 안에서 <%@page import="com.test.decodeparam.Decrypt"%> 를 하면
WEB-INF\classes\com\test\decodeparam\Decrypt.class 에서 클래스 파일을 가져와서
Decrypt 클래스를 JSP 상에서 사용할 수 있다.
[출처] Android 와 JSP 간 파라미터 암복호화 (2) |작성자 덜지