1 line
37 KiB
Plaintext
1 line
37 KiB
Plaintext
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* @file Web Cryptography API shim\n * @author Artem S Vybornov <vybornov@gmail.com>\n * @license MIT\n */\n(function (global, factory) {\n if (typeof define === 'function' && define.amd) {\n // AMD. Register as an anonymous module.\n define([], function () {\n return factory(global);\n });\n } else if (typeof module === 'object' && module.exports) {\n // CommonJS-like environments that support module.exports\n module.exports = factory(global);\n } else {\n factory(global);\n }\n}(typeof self !== 'undefined' ? self : this, function (global) {\n 'use strict';\n\n if ( typeof Promise !== 'function' )\n throw \"Promise support required\";\n\n var _crypto = global.crypto || global.msCrypto;\n if ( !_crypto ) return;\n\n var _subtle = _crypto.subtle || _crypto.webkitSubtle;\n if ( !_subtle ) return;\n\n var _Crypto = global.Crypto || _crypto.constructor || Object,\n _SubtleCrypto = global.SubtleCrypto || _subtle.constructor || Object,\n _CryptoKey = global.CryptoKey || global.Key || Object;\n\n var isEdge = global.navigator.userAgent.indexOf('Edge/') > -1;\n var isIE = !!global.msCrypto && !isEdge;\n var isWebkit = !_crypto.subtle && !!_crypto.webkitSubtle;\n if ( !isIE && !isWebkit ) return;\n\n function s2a ( s ) {\n return btoa(s).replace(/\\=+$/, '').replace(/\\+/g, '-').replace(/\\//g, '_');\n }\n\n function a2s ( s ) {\n s += '===', s = s.slice( 0, -s.length % 4 );\n return atob( s.replace(/-/g, '+').replace(/_/g, '/') );\n }\n\n function s2b ( s ) {\n var b = new Uint8Array(s.length);\n for ( var i = 0; i < s.length; i++ ) b[i] = s.charCodeAt(i);\n return b;\n }\n\n function b2s ( b ) {\n if ( b instanceof ArrayBuffer ) b = new Uint8Array(b);\n return String.fromCharCode.apply( String, b );\n }\n\n function alg ( a ) {\n var r = { 'name': (a.name || a || '').toUpperCase().replace('V','v') };\n switch ( r.name ) {\n case 'SHA-1':\n case 'SHA-256':\n case 'SHA-384':\n case 'SHA-512':\n break;\n case 'AES-CBC':\n case 'AES-GCM':\n case 'AES-KW':\n if ( a.length ) r['length'] = a.length;\n break;\n case 'HMAC':\n if ( a.hash ) r['hash'] = alg(a.hash);\n if ( a.length ) r['length'] = a.length;\n break;\n case 'RSAES-PKCS1-v1_5':\n if ( a.publicExponent ) r['publicExponent'] = new Uint8Array(a.publicExponent);\n if ( a.modulusLength ) r['modulusLength'] = a.modulusLength;\n break;\n case 'RSASSA-PKCS1-v1_5':\n case 'RSA-OAEP':\n if ( a.hash ) r['hash'] = alg(a.hash);\n if ( a.publicExponent ) r['publicExponent'] = new Uint8Array(a.publicExponent);\n if ( a.modulusLength ) r['modulusLength'] = a.modulusLength;\n break;\n default:\n throw new SyntaxError(\"Bad algorithm name\");\n }\n return r;\n };\n\n function jwkAlg ( a ) {\n return {\n 'HMAC': {\n 'SHA-1': 'HS1',\n 'SHA-256': 'HS256',\n 'SHA-384': 'HS384',\n 'SHA-512': 'HS512',\n },\n 'RSASSA-PKCS1-v1_5': {\n 'SHA-1': 'RS1',\n 'SHA-256': 'RS256',\n 'SHA-384': 'RS384',\n 'SHA-512': 'RS512',\n },\n 'RSAES-PKCS1-v1_5': {\n '': 'RSA1_5',\n },\n 'RSA-OAEP': {\n 'SHA-1': 'RSA-OAEP',\n 'SHA-256': 'RSA-OAEP-256',\n },\n 'AES-KW': {\n '128': 'A128KW',\n '192': 'A192KW',\n '256': 'A256KW',\n },\n 'AES-GCM': {\n '128': 'A128GCM',\n '192': 'A192GCM',\n '256': 'A256GCM',\n },\n 'AES-CBC': {\n '128': 'A128CBC',\n '192': 'A192CBC',\n '256': 'A256CBC',\n },\n }[a.name][ ( a.hash || {} ).name || a.length || '' ];\n }\n\n function b2jwk ( k ) {\n if ( k instanceof ArrayBuffer || k instanceof Uint8Array ) k = JSON.parse( decodeURIComponent( escape( b2s(k) ) ) );\n var jwk = { 'kty': k.kty, 'alg': k.alg, 'ext': k.ext || k.extractable };\n switch ( jwk.kty ) {\n case 'oct':\n jwk.k = k.k;\n case 'RSA':\n [ 'n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi', 'oth' ].forEach( function ( x ) { if ( x in k ) jwk[x] = k[x] } );\n break;\n default:\n throw new TypeError(\"Unsupported key type\");\n }\n return jwk;\n }\n\n function jwk2b ( k ) {\n var jwk = b2jwk(k);\n if ( isIE ) jwk['extractable'] = jwk.ext, delete jwk.ext;\n return s2b( unescape( encodeURIComponent( JSON.stringify(jwk) ) ) ).buffer;\n }\n\n function pkcs2jwk ( k ) {\n var info = b2der(k), prv = false;\n if ( info.length > 2 ) prv = true, info.shift(); // remove version from PKCS#8 PrivateKeyInfo structure\n var jwk = { 'ext': true };\n switch ( info[0][0] ) {\n case '1.2.840.113549.1.1.1':\n var rsaComp = [ 'n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi' ],\n rsaKey = b2der( info[1] );\n if ( prv ) rsaKey.shift(); // remove version from PKCS#1 RSAPrivateKey structure\n for ( var i = 0; i < rsaKey.length; i++ ) {\n if ( !rsaKey[i][0] ) rsaKey[i] = rsaKey[i].subarray(1);\n jwk[ rsaComp[i] ] = s2a( b2s( rsaKey[i] ) );\n }\n jwk['kty'] = 'RSA';\n break;\n default:\n throw new TypeError(\"Unsupported key type\");\n }\n return jwk;\n }\n\n function jwk2pkcs ( k ) {\n var key, info = [ [ '', null ] ], prv = false;\n switch ( k.kty ) {\n case 'RSA':\n var rsaComp = [ 'n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi' ],\n rsaKey = [];\n for ( var i = 0; i < rsaComp.length; i++ ) {\n if ( !( rsaComp[i] in k ) ) break;\n var b = rsaKey[i] = s2b( a2s( k[ rsaComp[i] ] ) );\n if ( b[0] & 0x80 ) rsaKey[i] = new Uint8Array(b.length + 1), rsaKey[i].set( b, 1 );\n }\n if ( rsaKey.length > 2 ) prv = true, rsaKey.unshift( new Uint8Array([0]) ); // add version to PKCS#1 RSAPrivateKey structure\n info[0][0] = '1.2.840.113549.1.1.1';\n key = rsaKey;\n break;\n default:\n throw new TypeError(\"Unsupported key type\");\n }\n info.push( new Uint8Array( der2b(key) ).buffer );\n if ( !prv ) info[1] = { 'tag': 0x03, 'value': info[1] };\n else info.unshift( new Uint8Array([0]) ); // add version to PKCS#8 PrivateKeyInfo structure\n return new Uint8Array( der2b(info) ).buffer;\n }\n\n var oid2str = { 'KoZIhvcNAQEB': '1.2.840.113549.1.1.1' },\n str2oid = { '1.2.840.113549.1.1.1': 'KoZIhvcNAQEB' };\n\n function b2der ( buf, ctx ) {\n if ( buf instanceof ArrayBuffer ) buf = new Uint8Array(buf);\n if ( !ctx ) ctx = { pos: 0, end: buf.length };\n\n if ( ctx.end - ctx.pos < 2 || ctx.end > buf.length ) throw new RangeError(\"Malformed DER\");\n\n var tag = buf[ctx.pos++],\n len = buf[ctx.pos++];\n\n if ( len >= 0x80 ) {\n len &= 0x7f;\n if ( ctx.end - ctx.pos < len ) throw new RangeError(\"Malformed DER\");\n for ( var xlen = 0; len--; ) xlen <<= 8, xlen |= buf[ctx.pos++];\n len = xlen;\n }\n\n if ( ctx.end - ctx.pos < len ) throw new RangeError(\"Malformed DER\");\n\n var rv;\n\n switch ( tag ) {\n case 0x02: // Universal Primitive INTEGER\n rv = buf.subarray( ctx.pos, ctx.pos += len );\n break;\n case 0x03: // Universal Primitive BIT STRING\n if ( buf[ctx.pos++] ) throw new Error( \"Unsupported bit string\" );\n len--;\n case 0x04: // Universal Primitive OCTET STRING\n rv = new Uint8Array( buf.subarray( ctx.pos, ctx.pos += len ) ).buffer;\n break;\n case 0x05: // Universal Primitive NULL\n rv = null;\n break;\n case 0x06: // Universal Primitive OBJECT IDENTIFIER\n var oid = btoa( b2s( buf.subarray( ctx.pos, ctx.pos += len ) ) );\n if ( !( oid in oid2str ) ) throw new Error( \"Unsupported OBJECT ID \" + oid );\n rv = oid2str[oid];\n break;\n case 0x30: // Universal Constructed SEQUENCE\n rv = [];\n for ( var end = ctx.pos + len; ctx.pos < end; ) rv.push( b2der( buf, ctx ) );\n break;\n default:\n throw new Error( \"Unsupported DER tag 0x\" + tag.toString(16) );\n }\n\n return rv;\n }\n\n function der2b ( val, buf ) {\n if ( !buf ) buf = [];\n\n var tag = 0, len = 0,\n pos = buf.length + 2;\n\n buf.push( 0, 0 ); // placeholder\n\n if ( val instanceof Uint8Array ) { // Universal Primitive INTEGER\n tag = 0x02, len = val.length;\n for ( var i = 0; i < len; i++ ) buf.push( val[i] );\n }\n else if ( val instanceof ArrayBuffer ) { // Universal Primitive OCTET STRING\n tag = 0x04, len = val.byteLength, val = new Uint8Array(val);\n for ( var i = 0; i < len; i++ ) buf.push( val[i] );\n }\n else if ( val === null ) { // Universal Primitive NULL\n tag = 0x05, len = 0;\n }\n else if ( typeof val === 'string' && val in str2oid ) { // Universal Primitive OBJECT IDENTIFIER\n var oid = s2b( atob( str2oid[val] ) );\n tag = 0x06, len = oid.length;\n for ( var i = 0; i < len; i++ ) buf.push( oid[i] );\n }\n else if ( val instanceof Array ) { // Universal Constructed SEQUENCE\n for ( var i = 0; i < val.length; i++ ) der2b( val[i], buf );\n tag = 0x30, len = buf.length - pos;\n }\n else if ( typeof val === 'object' && val.tag === 0x03 && val.value instanceof ArrayBuffer ) { // Tag hint\n val = new Uint8Array(val.value), tag = 0x03, len = val.byteLength;\n buf.push(0); for ( var i = 0; i < len; i++ ) buf.push( val[i] );\n len++;\n }\n else {\n throw new Error( \"Unsupported DER value \" + val );\n }\n\n if ( len >= 0x80 ) {\n var xlen = len, len = 4;\n buf.splice( pos, 0, (xlen >> 24) & 0xff, (xlen >> 16) & 0xff, (xlen >> 8) & 0xff, xlen & 0xff );\n while ( len > 1 && !(xlen >> 24) ) xlen <<= 8, len--;\n if ( len < 4 ) buf.splice( pos, 4 - len );\n len |= 0x80;\n }\n\n buf.splice( pos - 2, 2, tag, len );\n\n return buf;\n }\n\n function CryptoKey ( key, alg, ext, use ) {\n Object.defineProperties( this, {\n _key: {\n value: key\n },\n type: {\n value: key.type,\n enumerable: true,\n },\n extractable: {\n value: (ext === undefined) ? key.extractable : ext,\n enumerable: true,\n },\n algorithm: {\n value: (alg === undefined) ? key.algorithm : alg,\n enumerable: true,\n },\n usages: {\n value: (use === undefined) ? key.usages : use,\n enumerable: true,\n },\n });\n }\n\n function isPubKeyUse ( u ) {\n return u === 'verify' || u === 'encrypt' || u === 'wrapKey';\n }\n\n function isPrvKeyUse ( u ) {\n return u === 'sign' || u === 'decrypt' || u === 'unwrapKey';\n }\n\n [ 'generateKey', 'importKey', 'unwrapKey' ]\n .forEach( function ( m ) {\n var _fn = _subtle[m];\n\n _subtle[m] = function ( a, b, c ) {\n var args = [].slice.call(arguments),\n ka, kx, ku;\n\n switch ( m ) {\n case 'generateKey':\n ka = alg(a), kx = b, ku = c;\n break;\n case 'importKey':\n ka = alg(c), kx = args[3], ku = args[4];\n if ( a === 'jwk' ) {\n b = b2jwk(b);\n if ( !b.alg ) b.alg = jwkAlg(ka);\n if ( !b.key_ops ) b.key_ops = ( b.kty !== 'oct' ) ? ( 'd' in b ) ? ku.filter(isPrvKeyUse) : ku.filter(isPubKeyUse) : ku.slice();\n args[1] = jwk2b(b);\n }\n break;\n case 'unwrapKey':\n ka = args[4], kx = args[5], ku = args[6];\n args[2] = c._key;\n break;\n }\n\n if ( m === 'generateKey' && ka.name === 'HMAC' && ka.hash ) {\n ka.length = ka.length || { 'SHA-1': 512, 'SHA-256': 512, 'SHA-384': 1024, 'SHA-512': 1024 }[ka.hash.name];\n return _subtle.importKey( 'raw', _crypto.getRandomValues( new Uint8Array( (ka.length+7)>>3 ) ), ka, kx, ku );\n }\n\n if ( isWebkit && m === 'generateKey' && ka.name === 'RSASSA-PKCS1-v1_5' && ( !ka.modulusLength || ka.modulusLength >= 2048 ) ) {\n a = alg(a), a.name = 'RSAES-PKCS1-v1_5', delete a.hash;\n return _subtle.generateKey( a, true, [ 'encrypt', 'decrypt' ] )\n .then( function ( k ) {\n return Promise.all([\n _subtle.exportKey( 'jwk', k.publicKey ),\n _subtle.exportKey( 'jwk', k.privateKey ),\n ]);\n })\n .then( function ( keys ) {\n keys[0].alg = keys[1].alg = jwkAlg(ka);\n keys[0].key_ops = ku.filter(isPubKeyUse), keys[1].key_ops = ku.filter(isPrvKeyUse);\n return Promise.all([\n _subtle.importKey( 'jwk', keys[0], ka, true, keys[0].key_ops ),\n _subtle.importKey( 'jwk', keys[1], ka, kx, keys[1].key_ops ),\n ]);\n })\n .then( function ( keys ) {\n return {\n publicKey: keys[0],\n privateKey: keys[1],\n };\n });\n }\n\n if ( ( isWebkit || ( isIE && ( ka.hash || {} ).name === 'SHA-1' ) )\n && m === 'importKey' && a === 'jwk' && ka.name === 'HMAC' && b.kty === 'oct' ) {\n return _subtle.importKey( 'raw', s2b( a2s(b.k) ), c, args[3], args[4] );\n }\n\n if ( isWebkit && m === 'importKey' && ( a === 'spki' || a === 'pkcs8' ) ) {\n return _subtle.importKey( 'jwk', pkcs2jwk(b), c, args[3], args[4] );\n }\n\n if ( isIE && m === 'unwrapKey' ) {\n return _subtle.decrypt( args[3], c, b )\n .then( function ( k ) {\n return _subtle.importKey( a, k, args[4], args[5], args[6] );\n });\n }\n\n var op;\n try {\n op = _fn.apply( _subtle, args );\n }\n catch ( e ) {\n return Promise.reject(e);\n }\n\n if ( isIE ) {\n op = new Promise( function ( res, rej ) {\n op.onabort =\n op.onerror = function ( e ) { rej(e) };\n op.oncomplete = function ( r ) { res(r.target.result) };\n });\n }\n\n op = op.then( function ( k ) {\n if ( ka.name === 'HMAC' ) {\n if ( !ka.length ) ka.length = 8 * k.algorithm.length;\n }\n if ( ka.name.search('RSA') == 0 ) {\n if ( !ka.modulusLength ) ka.modulusLength = (k.publicKey || k).algorithm.modulusLength;\n if ( !ka.publicExponent ) ka.publicExponent = (k.publicKey || k).algorithm.publicExponent;\n }\n if ( k.publicKey && k.privateKey ) {\n k = {\n publicKey: new CryptoKey( k.publicKey, ka, kx, ku.filter(isPubKeyUse) ),\n privateKey: new CryptoKey( k.privateKey, ka, kx, ku.filter(isPrvKeyUse) ),\n };\n }\n else {\n k = new CryptoKey( k, ka, kx, ku );\n }\n return k;\n });\n\n return op;\n }\n });\n\n [ 'exportKey', 'wrapKey' ]\n .forEach( function ( m ) {\n var _fn = _subtle[m];\n\n _subtle[m] = function ( a, b, c ) {\n var args = [].slice.call(arguments);\n\n switch ( m ) {\n case 'exportKey':\n args[1] = b._key;\n break;\n case 'wrapKey':\n args[1] = b._key, args[2] = c._key;\n break;\n }\n\n if ( ( isWebkit || ( isIE && ( b.algorithm.hash || {} ).name === 'SHA-1' ) )\n && m === 'exportKey' && a === 'jwk' && b.algorithm.name === 'HMAC' ) {\n args[0] = 'raw';\n }\n\n if ( isWebkit && m === 'exportKey' && ( a === 'spki' || a === 'pkcs8' ) ) {\n args[0] = 'jwk';\n }\n\n if ( isIE && m === 'wrapKey' ) {\n return _subtle.exportKey( a, b )\n .then( function ( k ) {\n if ( a === 'jwk' ) k = s2b( unescape( encodeURIComponent( JSON.stringify( b2jwk(k) ) ) ) );\n return _subtle.encrypt( args[3], c, k );\n });\n }\n\n var op;\n try {\n op = _fn.apply( _subtle, args );\n }\n catch ( e ) {\n return Promise.reject(e);\n }\n\n if ( isIE ) {\n op = new Promise( function ( res, rej ) {\n op.onabort =\n op.onerror = function ( e ) { rej(e) };\n op.oncomplete = function ( r ) { res(r.target.result) };\n });\n }\n\n if ( m === 'exportKey' && a === 'jwk' ) {\n op = op.then( function ( k ) {\n if ( ( isWebkit || ( isIE && ( b.algorithm.hash || {} ).name === 'SHA-1' ) )\n && b.algorithm.name === 'HMAC') {\n return { 'kty': 'oct', 'alg': jwkAlg(b.algorithm), 'key_ops': b.usages.slice(), 'ext': true, 'k': s2a( b2s(k) ) };\n }\n k = b2jwk(k);\n if ( !k.alg ) k['alg'] = jwkAlg(b.algorithm);\n if ( !k.key_ops ) k['key_ops'] = ( b.type === 'public' ) ? b.usages.filter(isPubKeyUse) : ( b.type === 'private' ) ? b.usages.filter(isPrvKeyUse) : b.usages.slice();\n return k;\n });\n }\n\n if ( isWebkit && m === 'exportKey' && ( a === 'spki' || a === 'pkcs8' ) ) {\n op = op.then( function ( k ) {\n k = jwk2pkcs( b2jwk(k) );\n return k;\n });\n }\n\n return op;\n }\n });\n\n [ 'encrypt', 'decrypt', 'sign', 'verify' ]\n .forEach( function ( m ) {\n var _fn = _subtle[m];\n\n _subtle[m] = function ( a, b, c, d ) {\n if ( isIE && ( !c.byteLength || ( d && !d.byteLength ) ) )\n throw new Error(\"Empy input is not allowed\");\n\n var args = [].slice.call(arguments),\n ka = alg(a);\n\n if ( isIE && ( m === 'encrypt' || m === 'decrypt' ) && b.algorithm.hash ) {\n args[0].hash = args[0].hash || b.algorithm.hash;\n }\n\n if ( isIE && m === 'decrypt' && ka.name === 'AES-GCM' ) {\n var tl = a.tagLength >> 3;\n args[2] = (c.buffer || c).slice( 0, c.byteLength - tl ),\n a.tag = (c.buffer || c).slice( c.byteLength - tl );\n }\n\n args[1] = b._key;\n\n var op;\n try {\n op = _fn.apply( _subtle, args );\n }\n catch ( e ) {\n return Promise.reject(e);\n }\n\n if ( isIE ) {\n op = new Promise( function ( res, rej ) {\n op.onabort =\n op.onerror = function ( e ) {\n rej(e);\n };\n\n op.oncomplete = function ( r ) {\n var r = r.target.result;\n\n if ( m === 'encrypt' && r instanceof AesGcmEncryptResult ) {\n var c = r.ciphertext, t = r.tag;\n r = new Uint8Array( c.byteLength + t.byteLength );\n r.set( new Uint8Array(c), 0 );\n r.set( new Uint8Array(t), c.byteLength );\n r = r.buffer;\n }\n\n res(r);\n };\n });\n }\n\n return op;\n }\n });\n\n if ( isIE ) {\n var _digest = _subtle.digest;\n\n _subtle['digest'] = function ( a, b ) {\n if ( !b.byteLength )\n throw new Error(\"Empy input is not allowed\");\n\n var op;\n try {\n op = _digest.call( _subtle, a, b );\n }\n catch ( e ) {\n return Promise.reject(e);\n }\n\n op = new Promise( function ( res, rej ) {\n op.onabort =\n op.onerror = function ( e ) { rej(e) };\n op.oncomplete = function ( r ) { res(r.target.result) };\n });\n\n return op;\n };\n\n global.crypto = Object.create( _crypto, {\n getRandomValues: { value: function ( a ) { return _crypto.getRandomValues(a) } },\n subtle: { value: _subtle },\n });\n\n global.CryptoKey = CryptoKey;\n }\n\n if ( isWebkit ) {\n _crypto.subtle = _subtle;\n\n global.Crypto = _Crypto;\n global.SubtleCrypto = _SubtleCrypto;\n global.CryptoKey = CryptoKey;\n }\n}));\n"]} |