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Specify the saltLength only and the built-in PRNG will generate it. * 2. Specify the saltLength and a custom PRNG with 'getBytesSync' defined that * will be used. * 3. Specify the salt itself as a forge.util.ByteBuffer. * * @param options the options to use: * md the message digest object to use, a forge md instance. * mgf the mask generation function to use, a forge mgf instance. * [saltLength] the length of the salt in octets. * [prng] the pseudo-random number generator to use to produce a salt. * [salt] the salt to use when encoding. * * @return a signature scheme object. */ pss.create = function(options) { // backwards compatibility w/legacy args: hash, mgf, sLen if(arguments.length === 3) { options = { md: arguments[0], mgf: arguments[1], saltLength: arguments[2] }; } var hash = options.md; var mgf = options.mgf; var hLen = hash.digestLength; var salt_ = options.salt || null; if(typeof salt_ === 'string') { // assume binary-encoded string salt_ = forge.util.createBuffer(salt_); } var sLen; if('saltLength' in options) { sLen = options.saltLength; } else if(salt_ !== null) { sLen = salt_.length(); } else { throw new Error('Salt length not specified or specific salt not given.'); } if(salt_ !== null && salt_.length() !== sLen) { throw new Error('Given salt length does not match length of given salt.'); } var prng = options.prng || forge.random; var pssobj = {}; /** * Encodes a PSS signature. * * This function implements EMSA-PSS-ENCODE as per RFC 3447, section 9.1.1. * * @param md the message digest object with the hash to sign. * @param modsBits the length of the RSA modulus in bits. * * @return the encoded message as a binary-encoded string of length * ceil((modBits - 1) / 8). */ pssobj.encode = function(md, modBits) { var i; var emBits = modBits - 1; var emLen = Math.ceil(emBits / 8); /* 2. Let mHash = Hash(M), an octet string of length hLen. */ var mHash = md.digest().getBytes(); /* 3. If emLen < hLen + sLen + 2, output "encoding error" and stop. */ if(emLen < hLen + sLen + 2) { throw new Error('Message is too long to encrypt.'); } /* 4. Generate a random octet string salt of length sLen; if sLen = 0, * then salt is the empty string. */ var salt; if(salt_ === null) { salt = prng.getBytesSync(sLen); } else { salt = salt_.bytes(); } /* 5. Let M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt; */ var m_ = new forge.util.ByteBuffer(); m_.fillWithByte(0, 8); m_.putBytes(mHash); m_.putBytes(salt); /* 6. Let H = Hash(M'), an octet string of length hLen. */ hash.start(); hash.update(m_.getBytes()); var h = hash.digest().getBytes(); /* 7. Generate an octet string PS consisting of emLen - sLen - hLen - 2 * zero octets. The length of PS may be 0. */ var ps = new forge.util.ByteBuffer(); ps.fillWithByte(0, emLen - sLen - hLen - 2); /* 8. Let DB = PS || 0x01 || salt; DB is an octet string of length * emLen - hLen - 1. */ ps.putByte(0x01); ps.putBytes(salt); var db = ps.getBytes(); /* 9. Let dbMask = MGF(H, emLen - hLen - 1). */ var maskLen = emLen - hLen - 1; var dbMask = mgf.generate(h, maskLen); /* 10. Let maskedDB = DB \xor dbMask. */ var maskedDB = ''; for(i = 0; i < maskLen; i++) { maskedDB += String.fromCharCode(db.charCodeAt(i) ^ dbMask.charCodeAt(i)); } /* 11. Set the leftmost 8emLen - emBits bits of the leftmost octet in * maskedDB to zero. */ var mask = (0xFF00 >> (8 * emLen - emBits)) & 0xFF; maskedDB = String.fromCharCode(maskedDB.charCodeAt(0) & ~mask) + maskedDB.substr(1); /* 12. Let EM = maskedDB || H || 0xbc. * 13. Output EM. */ return maskedDB + h + String.fromCharCode(0xbc); }; /** * Verifies a PSS signature. * * This function implements EMSA-PSS-VERIFY as per RFC 3447, section 9.1.2. * * @param mHash the message digest hash, as a binary-encoded string, to * compare against the signature. * @param em the encoded message, as a binary-encoded string * (RSA decryption result). * @param modsBits the length of the RSA modulus in bits. * * @return true if the signature was verified, false if not. */ pssobj.verify = function(mHash, em, modBits) { var i; var emBits = modBits - 1; var emLen = Math.ceil(emBits / 8); /* c. Convert the message representative m to an encoded message EM * of length emLen = ceil((modBits - 1) / 8) octets, where modBits * is the length in bits of the RSA modulus n */ em = em.substr(-emLen); /* 3. If emLen < hLen + sLen + 2, output "inconsistent" and stop. */ if(emLen < hLen + sLen + 2) { throw new Error('Inconsistent parameters to PSS signature verification.'); } /* 4. If the rightmost octet of EM does not have hexadecimal value * 0xbc, output "inconsistent" and stop. */ if(em.charCodeAt(emLen - 1) !== 0xbc) { throw new Error('Encoded message does not end in 0xBC.'); } /* 5. Let maskedDB be the leftmost emLen - hLen - 1 octets of EM, and * let H be the next hLen octets. */ var maskLen = emLen - hLen - 1; var maskedDB = em.substr(0, maskLen); var h = em.substr(maskLen, hLen); /* 6. If the leftmost 8emLen - emBits bits of the leftmost octet in * maskedDB are not all equal to zero, output "inconsistent" and stop. */ var mask = (0xFF00 >> (8 * emLen - emBits)) & 0xFF; if((maskedDB.charCodeAt(0) & mask) !== 0) { throw new Error('Bits beyond keysize not zero as expected.'); } /* 7. Let dbMask = MGF(H, emLen - hLen - 1). */ var dbMask = mgf.generate(h, maskLen); /* 8. Let DB = maskedDB \xor dbMask. */ var db = ''; for(i = 0; i < maskLen; i++) { db += String.fromCharCode(maskedDB.charCodeAt(i) ^ dbMask.charCodeAt(i)); } /* 9. Set the leftmost 8emLen - emBits bits of the leftmost octet * in DB to zero. */ db = String.fromCharCode(db.charCodeAt(0) & ~mask) + db.substr(1); /* 10. If the emLen - hLen - sLen - 2 leftmost octets of DB are not zero * or if the octet at position emLen - hLen - sLen - 1 (the leftmost * position is "position 1") does not have hexadecimal value 0x01, * output "inconsistent" and stop. */ var checkLen = emLen - hLen - sLen - 2; for(i = 0; i < checkLen; i++) { if(db.charCodeAt(i) !== 0x00) { throw new Error('Leftmost octets not zero as expected'); } } if(db.charCodeAt(checkLen) !== 0x01) { throw new Error('Inconsistent PSS signature, 0x01 marker not found'); } /* 11. Let salt be the last sLen octets of DB. */ var salt = db.substr(-sLen); /* 12. Let M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt */ var m_ = new forge.util.ByteBuffer(); m_.fillWithByte(0, 8); m_.putBytes(mHash); m_.putBytes(salt); /* 13. Let H' = Hash(M'), an octet string of length hLen. */ hash.start(); hash.update(m_.getBytes()); var h_ = hash.digest().getBytes(); /* 14. If H = H', output "consistent." Otherwise, output "inconsistent." */ return h === h_; }; return pssobj; };