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-rw-r--r--core/fdrm/fx_crypt.cpp235
1 files changed, 235 insertions, 0 deletions
diff --git a/core/fdrm/fx_crypt.cpp b/core/fdrm/fx_crypt.cpp
new file mode 100644
index 0000000000..e31bde992c
--- /dev/null
+++ b/core/fdrm/fx_crypt.cpp
@@ -0,0 +1,235 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fdrm/fx_crypt.h"
+
+#include <utility>
+
+#define GET_UINT32(n, b, i) \
+ { \
+ (n) = (uint32_t)((uint8_t*)b)[(i)] | \
+ (((uint32_t)((uint8_t*)b)[(i) + 1]) << 8) | \
+ (((uint32_t)((uint8_t*)b)[(i) + 2]) << 16) | \
+ (((uint32_t)((uint8_t*)b)[(i) + 3]) << 24); \
+ }
+#define PUT_UINT32(n, b, i) \
+ { \
+ (((uint8_t*)b)[(i)]) = (uint8_t)(((n)) & 0xFF); \
+ (((uint8_t*)b)[(i) + 1]) = (uint8_t)(((n) >> 8) & 0xFF); \
+ (((uint8_t*)b)[(i) + 2]) = (uint8_t)(((n) >> 16) & 0xFF); \
+ (((uint8_t*)b)[(i) + 3]) = (uint8_t)(((n) >> 24) & 0xFF); \
+ }
+
+namespace {
+
+const uint8_t md5_padding[64] = {
+ 0x80, 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};
+
+void md5_process(CRYPT_md5_context* ctx, const uint8_t data[64]) {
+ uint32_t A, B, C, D, X[16];
+ GET_UINT32(X[0], data, 0);
+ GET_UINT32(X[1], data, 4);
+ GET_UINT32(X[2], data, 8);
+ GET_UINT32(X[3], data, 12);
+ GET_UINT32(X[4], data, 16);
+ GET_UINT32(X[5], data, 20);
+ GET_UINT32(X[6], data, 24);
+ GET_UINT32(X[7], data, 28);
+ GET_UINT32(X[8], data, 32);
+ GET_UINT32(X[9], data, 36);
+ GET_UINT32(X[10], data, 40);
+ GET_UINT32(X[11], data, 44);
+ GET_UINT32(X[12], data, 48);
+ GET_UINT32(X[13], data, 52);
+ GET_UINT32(X[14], data, 56);
+ GET_UINT32(X[15], data, 60);
+#define S(x, n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
+#define P(a, b, c, d, k, s, t) \
+ { \
+ a += F(b, c, d) + X[k] + t; \
+ a = S(a, s) + b; \
+ }
+ A = ctx->state[0];
+ B = ctx->state[1];
+ C = ctx->state[2];
+ D = ctx->state[3];
+#define F(x, y, z) (z ^ (x & (y ^ z)))
+ P(A, B, C, D, 0, 7, 0xD76AA478);
+ P(D, A, B, C, 1, 12, 0xE8C7B756);
+ P(C, D, A, B, 2, 17, 0x242070DB);
+ P(B, C, D, A, 3, 22, 0xC1BDCEEE);
+ P(A, B, C, D, 4, 7, 0xF57C0FAF);
+ P(D, A, B, C, 5, 12, 0x4787C62A);
+ P(C, D, A, B, 6, 17, 0xA8304613);
+ P(B, C, D, A, 7, 22, 0xFD469501);
+ P(A, B, C, D, 8, 7, 0x698098D8);
+ P(D, A, B, C, 9, 12, 0x8B44F7AF);
+ P(C, D, A, B, 10, 17, 0xFFFF5BB1);
+ P(B, C, D, A, 11, 22, 0x895CD7BE);
+ P(A, B, C, D, 12, 7, 0x6B901122);
+ P(D, A, B, C, 13, 12, 0xFD987193);
+ P(C, D, A, B, 14, 17, 0xA679438E);
+ P(B, C, D, A, 15, 22, 0x49B40821);
+#undef F
+#define F(x, y, z) (y ^ (z & (x ^ y)))
+ P(A, B, C, D, 1, 5, 0xF61E2562);
+ P(D, A, B, C, 6, 9, 0xC040B340);
+ P(C, D, A, B, 11, 14, 0x265E5A51);
+ P(B, C, D, A, 0, 20, 0xE9B6C7AA);
+ P(A, B, C, D, 5, 5, 0xD62F105D);
+ P(D, A, B, C, 10, 9, 0x02441453);
+ P(C, D, A, B, 15, 14, 0xD8A1E681);
+ P(B, C, D, A, 4, 20, 0xE7D3FBC8);
+ P(A, B, C, D, 9, 5, 0x21E1CDE6);
+ P(D, A, B, C, 14, 9, 0xC33707D6);
+ P(C, D, A, B, 3, 14, 0xF4D50D87);
+ P(B, C, D, A, 8, 20, 0x455A14ED);
+ P(A, B, C, D, 13, 5, 0xA9E3E905);
+ P(D, A, B, C, 2, 9, 0xFCEFA3F8);
+ P(C, D, A, B, 7, 14, 0x676F02D9);
+ P(B, C, D, A, 12, 20, 0x8D2A4C8A);
+#undef F
+#define F(x, y, z) (x ^ y ^ z)
+ P(A, B, C, D, 5, 4, 0xFFFA3942);
+ P(D, A, B, C, 8, 11, 0x8771F681);
+ P(C, D, A, B, 11, 16, 0x6D9D6122);
+ P(B, C, D, A, 14, 23, 0xFDE5380C);
+ P(A, B, C, D, 1, 4, 0xA4BEEA44);
+ P(D, A, B, C, 4, 11, 0x4BDECFA9);
+ P(C, D, A, B, 7, 16, 0xF6BB4B60);
+ P(B, C, D, A, 10, 23, 0xBEBFBC70);
+ P(A, B, C, D, 13, 4, 0x289B7EC6);
+ P(D, A, B, C, 0, 11, 0xEAA127FA);
+ P(C, D, A, B, 3, 16, 0xD4EF3085);
+ P(B, C, D, A, 6, 23, 0x04881D05);
+ P(A, B, C, D, 9, 4, 0xD9D4D039);
+ P(D, A, B, C, 12, 11, 0xE6DB99E5);
+ P(C, D, A, B, 15, 16, 0x1FA27CF8);
+ P(B, C, D, A, 2, 23, 0xC4AC5665);
+#undef F
+#define F(x, y, z) (y ^ (x | ~z))
+ P(A, B, C, D, 0, 6, 0xF4292244);
+ P(D, A, B, C, 7, 10, 0x432AFF97);
+ P(C, D, A, B, 14, 15, 0xAB9423A7);
+ P(B, C, D, A, 5, 21, 0xFC93A039);
+ P(A, B, C, D, 12, 6, 0x655B59C3);
+ P(D, A, B, C, 3, 10, 0x8F0CCC92);
+ P(C, D, A, B, 10, 15, 0xFFEFF47D);
+ P(B, C, D, A, 1, 21, 0x85845DD1);
+ P(A, B, C, D, 8, 6, 0x6FA87E4F);
+ P(D, A, B, C, 15, 10, 0xFE2CE6E0);
+ P(C, D, A, B, 6, 15, 0xA3014314);
+ P(B, C, D, A, 13, 21, 0x4E0811A1);
+ P(A, B, C, D, 4, 6, 0xF7537E82);
+ P(D, A, B, C, 11, 10, 0xBD3AF235);
+ P(C, D, A, B, 2, 15, 0x2AD7D2BB);
+ P(B, C, D, A, 9, 21, 0xEB86D391);
+#undef F
+ ctx->state[0] += A;
+ ctx->state[1] += B;
+ ctx->state[2] += C;
+ ctx->state[3] += D;
+}
+
+} // namespace
+
+void CRYPT_ArcFourSetup(CRYPT_rc4_context* s,
+ const uint8_t* key,
+ uint32_t length) {
+ s->x = 0;
+ s->y = 0;
+ for (int i = 0; i < kRC4ContextPermutationLength; ++i)
+ s->m[i] = i;
+
+ int j = 0;
+ for (int i = 0; i < kRC4ContextPermutationLength; ++i) {
+ j = (j + s->m[i] + (length ? key[i % length] : 0)) & 0xFF;
+ std::swap(s->m[i], s->m[j]);
+ }
+}
+
+void CRYPT_ArcFourCrypt(CRYPT_rc4_context* s, uint8_t* data, uint32_t length) {
+ for (uint32_t i = 0; i < length; ++i) {
+ s->x = (s->x + 1) & 0xFF;
+ s->y = (s->y + s->m[s->x]) & 0xFF;
+ std::swap(s->m[s->x], s->m[s->y]);
+ data[i] ^= s->m[(s->m[s->x] + s->m[s->y]) & 0xFF];
+ }
+}
+
+void CRYPT_ArcFourCryptBlock(uint8_t* pData,
+ uint32_t size,
+ const uint8_t* key,
+ uint32_t keylen) {
+ CRYPT_rc4_context s;
+ CRYPT_ArcFourSetup(&s, key, keylen);
+ CRYPT_ArcFourCrypt(&s, pData, size);
+}
+
+void CRYPT_MD5Start(CRYPT_md5_context* ctx) {
+ ctx->total[0] = 0;
+ ctx->total[1] = 0;
+ ctx->state[0] = 0x67452301;
+ ctx->state[1] = 0xEFCDAB89;
+ ctx->state[2] = 0x98BADCFE;
+ ctx->state[3] = 0x10325476;
+}
+
+void CRYPT_MD5Update(CRYPT_md5_context* ctx,
+ const uint8_t* input,
+ uint32_t length) {
+ uint32_t left, fill;
+ if (!length) {
+ return;
+ }
+ left = (ctx->total[0] >> 3) & 0x3F;
+ fill = 64 - left;
+ ctx->total[0] += length << 3;
+ ctx->total[1] += length >> 29;
+ ctx->total[0] &= 0xFFFFFFFF;
+ ctx->total[1] += ctx->total[0] < length << 3;
+ if (left && length >= fill) {
+ memcpy(ctx->buffer + left, input, fill);
+ md5_process(ctx, ctx->buffer);
+ length -= fill;
+ input += fill;
+ left = 0;
+ }
+ while (length >= 64) {
+ md5_process(ctx, input);
+ length -= 64;
+ input += 64;
+ }
+ if (length) {
+ memcpy(ctx->buffer + left, input, length);
+ }
+}
+
+void CRYPT_MD5Finish(CRYPT_md5_context* ctx, uint8_t digest[16]) {
+ uint32_t last, padn;
+ uint8_t msglen[8];
+ PUT_UINT32(ctx->total[0], msglen, 0);
+ PUT_UINT32(ctx->total[1], msglen, 4);
+ last = (ctx->total[0] >> 3) & 0x3F;
+ padn = (last < 56) ? (56 - last) : (120 - last);
+ CRYPT_MD5Update(ctx, md5_padding, padn);
+ CRYPT_MD5Update(ctx, msglen, 8);
+ PUT_UINT32(ctx->state[0], digest, 0);
+ PUT_UINT32(ctx->state[1], digest, 4);
+ PUT_UINT32(ctx->state[2], digest, 8);
+ PUT_UINT32(ctx->state[3], digest, 12);
+}
+
+void CRYPT_MD5Generate(const uint8_t* input,
+ uint32_t length,
+ uint8_t digest[16]) {
+ CRYPT_md5_context ctx;
+ CRYPT_MD5Start(&ctx);
+ CRYPT_MD5Update(&ctx, input, length);
+ CRYPT_MD5Finish(&ctx, digest);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 08:00:46 +0000