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Add support for saving forms

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Calixte Denizet 2020-08-03 19:44:04 +02:00 • committed by calixteman
parent 3380f2a7fc
commit 1a6816ba98
16 changed files with 1060 additions and 8 deletions
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41
src/core/crypto.js
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@ -73,6 +73,7 @@ var ARCFourCipher = (function ARCFourCipherClosure() {
},
};
ARCFourCipher.prototype.decryptBlock = ARCFourCipher.prototype.encryptBlock;
ARCFourCipher.prototype.encrypt = ARCFourCipher.prototype.encryptBlock;
return ARCFourCipher;
})();
@ -699,6 +700,9 @@ var NullCipher = (function NullCipherClosure() {
decryptBlock: function NullCipher_decryptBlock(data) {
return data;
},
encrypt: function NullCipher_encrypt(data) {
return data;
},
};
return NullCipher;
@ -1097,6 +1101,7 @@ class AESBaseCipher {
if (bufferLength < 16) {
continue;
}
for (let j = 0; j < 16; ++j) {
buffer[j] ^= iv[j];
}
@ -1474,6 +1479,42 @@ var CipherTransform = (function CipherTransformClosure() {
data = cipher.decryptBlock(data, true);
return bytesToString(data);
},
encryptString: function CipherTransform_encryptString(s) {
const cipher = new this.StringCipherConstructor();
if (cipher instanceof AESBaseCipher) {
// Append some chars equal to "16 - (M mod 16)"
// where M is the string length (see section 7.6.2 in PDF specification)
// to have a final string where the length is a multiple of 16.
const strLen = s.length;
const pad = 16 - (strLen % 16);
if (pad !== 16) {
s = s.padEnd(16 * Math.ceil(strLen / 16), String.fromCharCode(pad));
}
// Generate an initialization vector
const iv = new Uint8Array(16);
if (typeof crypto !== "undefined") {
crypto.getRandomValues(iv);
} else {
for (let i = 0; i < 16; i++) {
iv[i] = Math.floor(256 * Math.random());
}
}
let data = stringToBytes(s);
data = cipher.encrypt(data, iv);
const buf = new Uint8Array(16 + data.length);
buf.set(iv);
buf.set(data, 16);
return bytesToString(buf);
}
let data = stringToBytes(s);
data = cipher.encrypt(data);
return bytesToString(data);
},
};
return CipherTransform;
})();