23295342fc
work correctly with utf8 strings. Fixeda visibility issue with the testing suite and added relevant unit tests.
480 lines
21 KiB
HTML
480 lines
21 KiB
HTML
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<h1 class="page-title">Source: ciphers/openpgp.crypto.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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// The GPG4Browsers crypto interface
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/**
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* Encrypts data using the specified public key multiprecision integers
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* and the specified algorithm.
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* @param {Integer} algo Algorithm to be used (See RFC4880 9.1)
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* @param {openpgp_type_mpi[]} publicMPIs Algorithm dependent multiprecision integers
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* @param {openpgp_type_mpi} data Data to be encrypted as MPI
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* @return {(openpgp_type_mpi|openpgp_type_mpi[])} if RSA an openpgp_type_mpi;
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* if elgamal encryption an array of two openpgp_type_mpi is returned; otherwise null
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*/
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function openpgp_crypto_asymetricEncrypt(algo, publicMPIs, data) {
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switch(algo) {
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case 1: // RSA (Encrypt or Sign) [HAC]
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case 2: // RSA Encrypt-Only [HAC]
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case 3: // RSA Sign-Only [HAC]
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var rsa = new RSA();
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var n = publicMPIs[0].toBigInteger();
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var e = publicMPIs[1].toBigInteger();
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var m = data.toBigInteger();
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return rsa.encrypt(m,e,n).toMPI();
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case 16: // Elgamal (Encrypt-Only) [ELGAMAL] [HAC]
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var elgamal = new Elgamal();
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var p = publicMPIs[0].toBigInteger();
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var g = publicMPIs[1].toBigInteger();
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var y = publicMPIs[2].toBigInteger();
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var m = data.toBigInteger();
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return elgamal.encrypt(m,g,p,y);
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default:
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return null;
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}
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}
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/**
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* Decrypts data using the specified public key multiprecision integers of the private key,
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* the specified secretMPIs of the private key and the specified algorithm.
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* @param {Integer} algo Algorithm to be used (See RFC4880 9.1)
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* @param {openpgp_type_mpi[]} publicMPIs Algorithm dependent multiprecision integers
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* of the public key part of the private key
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* @param {openpgp_type_mpi[]} secretMPIs Algorithm dependent multiprecision integers
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* of the private key used
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* @param {openpgp_type_mpi} data Data to be encrypted as MPI
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* @return {BigInteger} returns a big integer containing the decrypted data; otherwise null
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*/
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function openpgp_crypto_asymetricDecrypt(algo, publicMPIs, secretMPIs, dataMPIs) {
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switch(algo) {
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case 1: // RSA (Encrypt or Sign) [HAC]
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case 2: // RSA Encrypt-Only [HAC]
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case 3: // RSA Sign-Only [HAC]
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var rsa = new RSA();
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var d = secretMPIs[0].toBigInteger();
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var p = secretMPIs[1].toBigInteger();
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var q = secretMPIs[2].toBigInteger();
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var u = secretMPIs[3].toBigInteger();
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var m = dataMPIs[0].toBigInteger();
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return rsa.decrypt(m, d, p, q, u);
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case 16: // Elgamal (Encrypt-Only) [ELGAMAL] [HAC]
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var elgamal = new Elgamal();
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var x = secretMPIs[0].toBigInteger();
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var c1 = dataMPIs[0].toBigInteger();
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var c2 = dataMPIs[1].toBigInteger();
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var p = publicMPIs[0].toBigInteger();
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return elgamal.decrypt(c1,c2,p,x);
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default:
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return null;
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}
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}
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/**
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* generate random byte prefix as string for the specified algorithm
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @return {String} Random bytes with length equal to the block
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* size of the cipher
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*/
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function openpgp_crypto_getPrefixRandom(algo) {
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switch(algo) {
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case 2:
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case 3:
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case 4:
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return openpgp_crypto_getRandomBytes(8);
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case 7:
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case 8:
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case 9:
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case 10:
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return openpgp_crypto_getRandomBytes(16);
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default:
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return null;
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}
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}
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/**
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* retrieve the MDC prefixed bytes by decrypting them
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @param {String} key Key as string. length is depending on the algorithm used
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* @param {String} data Encrypted data where the prefix is decrypted from
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* @return {String} Plain text data of the prefixed data
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*/
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function openpgp_crypto_MDCSystemBytes(algo, key, data) {
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util.print_debug_hexstr_dump("openpgp_crypto_symmetricDecrypt:\nencrypteddata:",data);
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switch(algo) {
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case 0: // Plaintext or unencrypted data
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return data;
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case 2: // TripleDES (DES-EDE, [SCHNEIER] [HAC] - 168 bit key derived from 192)
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return openpgp_cfb_mdc(desede, 8, key, data, openpgp_cfb);
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case 3: // CAST5 (128 bit key, as per [RFC2144])
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return openpgp_cfb_mdc(cast5_encrypt, 8, key, data);
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case 4: // Blowfish (128 bit key, 16 rounds) [BLOWFISH]
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return openpgp_cfb_mdc(BFencrypt, 8, key, data);
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case 7: // AES with 128-bit key [AES]
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case 8: // AES with 192-bit key
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case 9: // AES with 256-bit key
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return openpgp_cfb_mdc(AESencrypt, 16, keyExpansion(key), data);
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case 10:
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return openpgp_cfb_mdc(TFencrypt, 16, key, data);
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case 1: // IDEA [IDEA]
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util.print_error(""+ (algo == 1 ? "IDEA Algorithm not implemented" : "Twofish Algorithm not implemented"));
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return null;
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default:
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}
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return null;
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}
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/**
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* Generating a session key for the specified symmetric algorithm
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @return {String} Random bytes as a string to be used as a key
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*/
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function openpgp_crypto_generateSessionKey(algo) {
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switch (algo) {
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case 2: // TripleDES (DES-EDE, [SCHNEIER] [HAC] - 168 bit key derived from 192)
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case 8: // AES with 192-bit key
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return openpgp_crypto_getRandomBytes(24);
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case 3: // CAST5 (128 bit key, as per [RFC2144])
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case 4: // Blowfish (128 bit key, 16 rounds) [BLOWFISH]
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case 7: // AES with 128-bit key [AES]
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util.print_debug("length = 16:\n"+util.hexstrdump(openpgp_crypto_getRandomBytes(16)));
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return openpgp_crypto_getRandomBytes(16);
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case 9: // AES with 256-bit key
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case 10:// Twofish with 256-bit key [TWOFISH]
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return openpgp_crypto_getRandomBytes(32);
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}
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return null;
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}
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/**
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*
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* @param {Integer} algo public Key algorithm
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* @param {Integer} hash_algo Hash algorithm
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* @param {openpgp_type_mpi[]} msg_MPIs Signature multiprecision integers
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* @param {openpgp_type_mpi[]} publickey_MPIs Public key multiprecision integers
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* @param {String} data Data on where the signature was computed on.
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* @return {Boolean} true if signature (sig_data was equal to data over hash)
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*/
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function openpgp_crypto_verifySignature(algo, hash_algo, msg_MPIs, publickey_MPIs, data) {
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var calc_hash = openpgp_crypto_hashData(hash_algo, data);
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switch(algo) {
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case 1: // RSA (Encrypt or Sign) [HAC]
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case 2: // RSA Encrypt-Only [HAC]
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case 3: // RSA Sign-Only [HAC]
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var rsa = new RSA();
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var n = publickey_MPIs[0].toBigInteger();
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var e = publickey_MPIs[1].toBigInteger();
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var x = msg_MPIs[0].toBigInteger();
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var dopublic = rsa.verify(x,e,n);
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var hash = openpgp_encoding_emsa_pkcs1_decode(hash_algo,dopublic.toMPI().substring(2));
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if (hash == -1) {
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util.print_error("PKCS1 padding in message or key incorrect. Aborting...");
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return false;
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}
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return hash == calc_hash;
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case 16: // Elgamal (Encrypt-Only) [ELGAMAL] [HAC]
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util.print_error("signing with Elgamal is not defined in the OpenPGP standard.");
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return null;
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case 17: // DSA (Digital Signature Algorithm) [FIPS186] [HAC]
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var dsa = new DSA();
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var s1 = msg_MPIs[0].toBigInteger();
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var s2 = msg_MPIs[1].toBigInteger();
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var p = publickey_MPIs[0].toBigInteger();
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var q = publickey_MPIs[1].toBigInteger();
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var g = publickey_MPIs[2].toBigInteger();
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var y = publickey_MPIs[3].toBigInteger();
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var m = data;
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var dopublic = dsa.verify(hash_algo,s1,s2,m,p,q,g,y);
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return dopublic.compareTo(s1) == 0;
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default:
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return null;
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}
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}
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/**
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* Create a signature on data using the specified algorithm
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* @param {Integer} hash_algo hash Algorithm to use (See RFC4880 9.4)
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* @param {Integer} algo Asymmetric cipher algorithm to use (See RFC4880 9.1)
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* @param {openpgp_type_mpi[]} publicMPIs Public key multiprecision integers
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* of the private key
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* @param {openpgp_type_mpi[]} secretMPIs Private key multiprecision
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* integers which is used to sign the data
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* @param {String} data Data to be signed
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* @return {(String|openpgp_type_mpi)}
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*/
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function openpgp_crypto_signData(hash_algo, algo, publicMPIs, secretMPIs, data) {
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switch(algo) {
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case 1: // RSA (Encrypt or Sign) [HAC]
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case 2: // RSA Encrypt-Only [HAC]
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case 3: // RSA Sign-Only [HAC]
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var rsa = new RSA();
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var d = secretMPIs[0].toBigInteger();
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var n = publicMPIs[0].toBigInteger();
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var m = openpgp_encoding_emsa_pkcs1_encode(hash_algo, data,publicMPIs[0].mpiByteLength);
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util.print_debug("signing using RSA");
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return rsa.sign(m, d, n).toMPI();
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case 17: // DSA (Digital Signature Algorithm) [FIPS186] [HAC]
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var dsa = new DSA();
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util.print_debug("DSA Sign: q size in Bytes:"+publicMPIs[1].getByteLength());
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var p = publicMPIs[0].toBigInteger();
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var q = publicMPIs[1].toBigInteger();
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var g = publicMPIs[2].toBigInteger();
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var y = publicMPIs[3].toBigInteger();
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var x = secretMPIs[0].toBigInteger();
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var m = data;
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var result = dsa.sign(hash_algo,m, g, p, q, x);
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util.print_debug("signing using DSA\n result:"+util.hexstrdump(result[0])+"|"+util.hexstrdump(result[1]));
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return result[0]+result[1];
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case 16: // Elgamal (Encrypt-Only) [ELGAMAL] [HAC]
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util.print_debug("signing with Elgamal is not defined in the OpenPGP standard.");
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return null;
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default:
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return null;
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}
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}
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/**
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* Create a hash on the specified data using the specified algorithm
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* @param {Integer} algo Hash algorithm type (see RFC4880 9.4)
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* @param {String} data Data to be hashed
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* @return {String} hash value
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*/
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function openpgp_crypto_hashData(algo, data) {
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var hash = null;
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switch(algo) {
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case 1: // - MD5 [HAC]
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hash = MD5(data);
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break;
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case 2: // - SHA-1 [FIPS180]
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hash = str_sha1(data);
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break;
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case 3: // - RIPE-MD/160 [HAC]
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hash = RMDstring(data);
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break;
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case 8: // - SHA256 [FIPS180]
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hash = str_sha256(data);
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break;
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case 9: // - SHA384 [FIPS180]
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hash = str_sha384(data);
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break;
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case 10:// - SHA512 [FIPS180]
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hash = str_sha512(data);
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break;
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case 11:// - SHA224 [FIPS180]
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hash = str_sha224(data);
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default:
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break;
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}
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return hash;
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}
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/**
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* Returns the hash size in bytes of the specified hash algorithm type
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* @param {Integer} algo Hash algorithm type (See RFC4880 9.4)
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* @return {Integer} Size in bytes of the resulting hash
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*/
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function openpgp_crypto_getHashByteLength(algo) {
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var hash = null;
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switch(algo) {
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case 1: // - MD5 [HAC]
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return 16;
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case 2: // - SHA-1 [FIPS180]
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case 3: // - RIPE-MD/160 [HAC]
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return 20;
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case 8: // - SHA256 [FIPS180]
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return 32;
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case 9: // - SHA384 [FIPS180]
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return 48
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case 10:// - SHA512 [FIPS180]
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return 64;
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case 11:// - SHA224 [FIPS180]
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return 28;
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}
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return null;
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}
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/**
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* Retrieve secure random byte string of the specified length
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* @param {Integer} length Length in bytes to generate
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* @return {String} Random byte string
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*/
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function openpgp_crypto_getRandomBytes(length) {
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var result = '';
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for (var i = 0; i < length; i++) {
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result += String.fromCharCode(openpgp_crypto_getSecureRandomOctet());
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}
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return result;
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}
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/**
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* Return a pseudo-random number in the specified range
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* @param {Integer} from Min of the random number
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* @param {Integer} to Max of the random number (max 32bit)
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* @return {Integer} A pseudo random number
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*/
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function openpgp_crypto_getPseudoRandom(from, to) {
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return Math.round(Math.random()*(to-from))+from;
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}
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/**
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* Return a secure random number in the specified range
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* @param {Integer} from Min of the random number
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* @param {Integer} to Max of the random number (max 32bit)
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* @return {Integer} A secure random number
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*/
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function openpgp_crypto_getSecureRandom(from, to) {
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var buf = new Uint32Array(1);
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window.crypto.getRandomValues(buf);
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var bits = ((to-from)).toString(2).length;
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while ((buf[0] & (Math.pow(2, bits) -1)) > (to-from))
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window.crypto.getRandomValues(buf);
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return from+(Math.abs(buf[0] & (Math.pow(2, bits) -1)));
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}
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function openpgp_crypto_getSecureRandomOctet() {
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var buf = new Uint32Array(1);
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window.crypto.getRandomValues(buf);
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return buf[0] & 0xFF;
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}
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/**
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* Create a secure random big integer of bits length
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* @param {Integer} bits Bit length of the MPI to create
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* @return {BigInteger} Resulting big integer
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*/
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function openpgp_crypto_getRandomBigInteger(bits) {
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if (bits < 0)
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return null;
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var numBytes = Math.floor((bits+7)/8);
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var randomBits = openpgp_crypto_getRandomBytes(numBytes);
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if (bits % 8 > 0) {
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randomBits = String.fromCharCode(
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(Math.pow(2,bits % 8)-1) &
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randomBits.charCodeAt(0)) +
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randomBits.substring(1);
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}
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return new openpgp_type_mpi().create(randomBits).toBigInteger();
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}
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function openpgp_crypto_getRandomBigIntegerInRange(min, max) {
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if (max.compareTo(min) <= 0)
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return;
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var range = max.subtract(min);
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var r = openpgp_crypto_getRandomBigInteger(range.bitLength());
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while (r > range) {
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r = openpgp_crypto_getRandomBigInteger(range.bitLength());
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}
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return min.add(r);
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}
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//This is a test method to ensure that encryption/decryption with a given 1024bit RSAKey object functions as intended
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function openpgp_crypto_testRSA(key){
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debugger;
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var rsa = new RSA();
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var mpi = new openpgp_type_mpi();
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mpi.create(openpgp_encoding_eme_pkcs1_encode('ABABABAB', 128));
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var msg = rsa.encrypt(mpi.toBigInteger(),key.ee,key.n);
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var result = rsa.decrypt(msg, key.d, key.p, key.q, key.u);
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}
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/**
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* @typedef {Object} openpgp_keypair
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* @property {openpgp_packet_keymaterial} privateKey
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* @property {openpgp_packet_keymaterial} publicKey
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*/
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/**
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* Calls the necessary crypto functions to generate a keypair.
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* Called directly by openpgp.js
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* @param {Integer} keyType Follows OpenPGP algorithm convention.
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* @param {Integer} numBits Number of bits to make the key to be generated
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* @return {openpgp_keypair}
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*/
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function openpgp_crypto_generateKeyPair(keyType, numBits, passphrase, s2kHash, symmetricEncryptionAlgorithm){
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var privKeyPacket;
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var publicKeyPacket;
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var d = new Date();
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d = d.getTime()/1000;
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var timePacket = String.fromCharCode(Math.floor(d/0x1000000%0x100)) + String.fromCharCode(Math.floor(d/0x10000%0x100)) + String.fromCharCode(Math.floor(d/0x100%0x100)) + String.fromCharCode(Math.floor(d%0x100));
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switch(keyType){
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case 1:
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var rsa = new RSA();
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var key = rsa.generate(numBits,"10001");
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privKeyPacket = new openpgp_packet_keymaterial().write_private_key(keyType, key, passphrase, s2kHash, symmetricEncryptionAlgorithm, timePacket);
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publicKeyPacket = new openpgp_packet_keymaterial().write_public_key(keyType, key, timePacket);
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break;
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default:
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util.print_error("Unknown keytype "+keyType)
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}
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return {privateKey: privKeyPacket, publicKey: publicKeyPacket};
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}
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</code></pre>
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