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jlattimer/Xrm.CRMAuth.js

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Dynamics CRM JavaScript SOAP only authentication - this only works in mobile applications - not browsers!
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Xrm.CRMAuth.js
//Requires jQuery - http://jquery.com/
//Requires jsSHA (sha1.js) - http://caligatio.github.io/jsSHA/
Xrm = window.Xrm || { __namespace: true };
Xrm.CRMAuth = Xrm.CRMAuth || { __namespace: true };
/// <summary>Gets a CRM Online SOAP header & expiration.</summary>
/// <param name="url" type="String">The Url of the CRM Online organization (https://org.crm.dynamics.com).</param>
/// <param name="username" type="String">Username of a valid CRM user.</param>
/// <param name="password" type="String">Password of a valid CRM user.</param>
/// <returns type="Object">An object containing the SOAP header and expiration date/time of the header.</returns>
Xrm.CRMAuth.GetHeaderOnline = function (url, username, password) {
if (!url.match(/\/$/)) url += '/';
var urnAddress = Xrm.CRMAuth.GetUrnOnline(url);
var now = new Date();
var xml = [];
xml.push('<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing" xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">');
xml.push('<s:Header>');
xml.push('<a:Action s:mustUnderstand="1">http://schemas.xmlsoap.org/ws/2005/02/trust/RST/Issue</a:Action>');
xml.push('<a:MessageID>urn:uuid:' + Xrm.CRMAuth.CreateGuid() + '</a:MessageID>');
xml.push('<a:ReplyTo>');
xml.push('<a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>');
xml.push('</a:ReplyTo>');
xml.push('<a:To s:mustUnderstand="1">https://login.microsoftonline.com/RST2.srf</a:To>');
xml.push('<o:Security s:mustUnderstand="1" xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<u:Timestamp u:Id="_0">');
xml.push('<u:Created>' + now.toISOString() + '</u:Created>');
xml.push('<u:Expires>' + new Date(now.setMinutes(now.getMinutes() + 60)).toISOString() + '</u:Expires>');
xml.push('</u:Timestamp>');
xml.push('<o:UsernameToken u:Id="uuid-' + Xrm.CRMAuth.CreateGuid() + '-1">');
xml.push('<o:Username>' + username + '</o:Username>');
xml.push('<o:Password>' + password + '</o:Password>');
xml.push('</o:UsernameToken>');
xml.push('</o:Security>');
xml.push('</s:Header>');
xml.push('<s:Body>');
xml.push('<trust:RequestSecurityToken xmlns:trust="http://schemas.xmlsoap.org/ws/2005/02/trust">');
xml.push('<wsp:AppliesTo xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy">');
xml.push('<a:EndpointReference>');
xml.push('<a:Address>urn:' + urnAddress + '</a:Address>');
xml.push('</a:EndpointReference>');
xml.push('</wsp:AppliesTo>');
xml.push('<trust:RequestType>http://schemas.xmlsoap.org/ws/2005/02/trust/Issue</trust:RequestType>');
xml.push('</trust:RequestSecurityToken>');
xml.push('</s:Body>');
xml.push('</s:Envelope>');
var authentication = {};
var request = xml.join('');
var req = new XMLHttpRequest();
req.open('POST', 'https://login.microsoftonline.com/RST2.srf', false);
req.setRequestHeader('Connection', 'Keep-Alive');
req.setRequestHeader('Content-Type', 'application/soap+xml; charset=UTF-8');
req.onreadystatechange = function () {
if (req.readyState === 4) {
if (req.status === 200) {
var token = $(req.response).find('CipherValue');
var keyIdentifer = $(req.response).find('wsse\\:KeyIdentifier:first');
authentication.TokenExpires = $(req.response).find('wsu\\:Expires:first').text();
authentication.Header = Xrm.CRMAuth.CreateSOAPHeaderOnline(url, $(keyIdentifer).text(), $(token[0]).text(), $(token[1]).text());
}
}
};
req.send(request);
return authentication;
};
/// <summary>Gets a CRM Online SOAP header.</summary>
/// <param name="url" type="String">The Url of the CRM Online organization (https://org.crm.dynamics.com).</param>
/// <param name="keyIdentifer" type="String">The KeyIdentifier from the initial request.</param>
/// <param name="token0" type="String">The first token from the initial request.</param>
/// <param name="token1" type="String">The second token from the initial request.</param>
/// <returns type="String">The XML SOAP header to be used in future requests.</returns>
Xrm.CRMAuth.CreateSOAPHeaderOnline = function (url, keyIdentifer, token0, token1) {
var xml = [];
xml.push('<s:Header>');
xml.push('<a:Action s:mustUnderstand="1">http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute</a:Action>');
xml.push('<Security xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<EncryptedData Id="Assertion0" Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns="http://www.w3.org/2001/04/xmlenc#">');
xml.push('<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc"/>');
xml.push('<ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">');
xml.push('<EncryptedKey>');
xml.push('<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p"/>');
xml.push('<ds:KeyInfo Id="keyinfo">');
xml.push('<wsse:SecurityTokenReference xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<wsse:KeyIdentifier EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509SubjectKeyIdentifier">' + keyIdentifer + '</wsse:KeyIdentifier>');
xml.push('</wsse:SecurityTokenReference>');
xml.push('</ds:KeyInfo>');
xml.push('<CipherData>');
xml.push('<CipherValue>' + token0 + '</CipherValue>');
xml.push('</CipherData>');
xml.push('</EncryptedKey>');
xml.push('</ds:KeyInfo>');
xml.push('<CipherData>');
xml.push('<CipherValue>' + token1 + '</CipherValue>');
xml.push('</CipherData>');
xml.push('</EncryptedData>');
xml.push('</Security>');
xml.push('<a:MessageID>urn:uuid:' + Xrm.CRMAuth.CreateGuid() + '</a:MessageID>');
xml.push('<a:ReplyTo>');
xml.push('<a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>');
xml.push('</a:ReplyTo>');
xml.push('<a:To s:mustUnderstand="1">' + url + 'XRMServices/2011/Organization.svc</a:To>');
xml.push('</s:Header>');
return xml.join('');
};
/// <summary>Gets the correct URN Address based on the Online region.</summary>
/// <param name="url" type="String">The Url of the CRM Online organization (https://org.crm.dynamics.com).</param>
/// <returns type="String">URN Address.</returns>
Xrm.CRMAuth.GetUrnOnline = function (url) {
if (url.toUpperCase().indexOf('CRM2.DYNAMICS.COM') !== -1) {
return 'crmsam:dynamics.com';
}
if (url.toUpperCase().indexOf('CRM4.DYNAMICS.COM') !== -1) {
return 'crmemea:dynamics.com';
}
if (url.toUpperCase().indexOf('CRM5.DYNAMICS.COM') !== -1) {
return 'crmapac:dynamics.com';
}
return 'crmna:dynamics.com';
};
/// <summary>Gets a CRM On Premise SOAP header & expiration.</summary>
/// <param name="url" type="String">The Url of the CRM On Premise (IFD) organization (https://org.domain.com).</param>
/// <param name="username" type="String">Username of a valid CRM user.</param>
/// <param name="password" type="String">Password of a valid CRM user.</param>
/// <returns type="Object">An object containing the SOAP header and expiration date/time of the header.</returns>
Xrm.CRMAuth.GetHeaderOnPremise = function (url, username, password) {
if (!url.match(/\/$/)) url += '/';
var adfsUrl = Xrm.CRMAuth.GetADFS(url);
var now = new Date();
var urnAddress = url + 'XRMServices/2011/Organization.svc';
var usernamemixed = adfsUrl + '/13/usernamemixed';
var xml = [];
xml.push('<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing">');
xml.push('<s:Header>');
xml.push('<a:Action s:mustUnderstand="1">http://docs.oasis-open.org/ws-sx/ws-trust/200512/RST/Issue</a:Action>');
xml.push('<a:MessageID>urn:uuid:' + Xrm.CRMAuth.CreateGuid() + '</a:MessageID>');
xml.push('<a:ReplyTo>');
xml.push('<a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>');
xml.push('</a:ReplyTo>');
xml.push('<Security s:mustUnderstand="1" xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<u:Timestamp u:Id="' + Xrm.CRMAuth.CreateGuid() + '">');
xml.push('<u:Created>' + now.toISOString() + '</u:Created>');
xml.push('<u:Expires>' + new Date(now.setMinutes(now.getMinutes() + 60)).toISOString() + '</u:Expires>');
xml.push('</u:Timestamp>');
xml.push('<UsernameToken u:Id="' + Xrm.CRMAuth.CreateGuid() + '">');
xml.push('<Username>' + username + '</Username>');
xml.push('<Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">' + password + '</Password>');
xml.push('</UsernameToken>');
xml.push('</Security>');
xml.push('<a:To s:mustUnderstand="1">' + usernamemixed + '</a:To>');
xml.push('</s:Header>');
xml.push('<s:Body>');
xml.push('<trust:RequestSecurityToken xmlns:trust="http://docs.oasis-open.org/ws-sx/ws-trust/200512">');
xml.push('<wsp:AppliesTo xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy">');
xml.push('<a:EndpointReference>');
xml.push('<a:Address>' + urnAddress + '</a:Address>');
xml.push('</a:EndpointReference>');
xml.push('</wsp:AppliesTo>');
xml.push('<trust:RequestType>http://docs.oasis-open.org/ws-sx/ws-trust/200512/Issue</trust:RequestType>');
xml.push('</trust:RequestSecurityToken>');
xml.push('</s:Body>');
xml.push('</s:Envelope>\n');
var authentication = {};
var request = xml.join('');
var req = new XMLHttpRequest();
req.open('POST', usernamemixed, false);
req.setRequestHeader('Connection', 'Keep-Alive');
req.setRequestHeader('Content-Type', 'application/soap+xml; charset=UTF-8');
req.onreadystatechange = function () {
if (req.readyState === 4) {
if (req.status === 200) {
var token0 = $(req.response).find('e\\:CipherValue');
var token1 = $(req.response).find('xenc\\:CipherValue');
var keyIdentifer = $(req.response).find('o\\:KeyIdentifier');
var issuerNameX509 = $(req.response).find('X509IssuerName');
var serialNumberX509 = $(req.response).find('X509SerialNumber');
var serverSecret = $($(req.response).find('trust\\:BinarySecret')[0]).text();
var created = new Date(now.setMinutes(now.getMinutes() - 1)).toISOString();
var expires = new Date(now.setMinutes(now.getMinutes() + 60)).toISOString();
var timestamp = '<u:Timestamp xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" u:Id="_0"><u:Created>' + created + '</u:Created><u:Expires>' + expires + '</u:Expires></u:Timestamp>';
var hashObj = new jsSHA(timestamp, 'TEXT');
var digestValue = hashObj.getHash('SHA-1', 'B64', 1);
var signedInfo = '<SignedInfo xmlns="http://www.w3.org/2000/09/xmldsig#"><CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></CanonicalizationMethod><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1"></SignatureMethod><Reference URI="#_0"><Transforms><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></Transform></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"></DigestMethod><DigestValue>' + digestValue + '</DigestValue></Reference></SignedInfo>';
var b64SignedInfo = Base64.encode(signedInfo);
var shaObj = new jsSHA(b64SignedInfo, 'B64');
var signatureValue = shaObj.getHMAC(serverSecret, 'B64', 'SHA-1', 'B64');
authentication.TokenExpires = $(req.response).find('wsu\\:Expires:first').text();
authentication.Header = Xrm.CRMAuth.CreateSOAPHeaderOnPremise(url, $(keyIdentifer[0]).text(), $(token0[0]).text(), $(token1[0]).text(), $(issuerNameX509[0]).text(), $(serialNumberX509[0]).text(), signatureValue, digestValue, created, expires);
}
}
};
req.send(request);
return authentication;
};
/// <summary>Gets a CRM On Premise (IFD) SOAP header.</summary>
/// <param name="url" type="String">The Url of the CRM On Premise (IFD) organization (https://org.domain.com).</param>
/// <param name="keyIdentifer" type="String">The KeyIdentifier from the initial request.</param>
/// <param name="token0" type="String">The first token from the initial request.</param>
/// <param name="token1" type="String">The second token from the initial request.</param>
/// <param name="issuerNameX509" type="String">The certificate issuer.</param>
/// <param name="serialNumberX509" type="String">The certificate serial number.</param>
/// <param name="signatureValue" type="String">The hashsed value of the header signature.</param>
/// <param name="digestValue" type="String">The hashed value of the header timestamp.</param>
/// <param name="created" type="String">The header created date/time.</param>
/// <param name="expires" type="String">The header expiration date/tim.</param>
/// <returns type="String">The XML SOAP header to be used in future requests.</returns>
Xrm.CRMAuth.CreateSOAPHeaderOnPremise = function (url, keyIdentifer, token0, token1, issuerNameX509, serialNumberX509, signatureValue, digestValue, created, expires) {
var xml = [];
xml.push('<s:Header>');
xml.push('<a:Action s:mustUnderstand="1">http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationService/Execute</a:Action>');
xml.push('<a:MessageID>urn:uuid:' + Xrm.CRMAuth.CreateGuid() + '</a:MessageID>');
xml.push('<a:ReplyTo>');
xml.push('<a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>');
xml.push('</a:ReplyTo>');
xml.push('<a:To s:mustUnderstand="1">' + url + 'XRMServices/2011/Organization.svc</a:To>');
xml.push('<o:Security xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<u:Timestamp xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" u:Id="_0">');
xml.push('<u:Created>' + created + '</u:Created>');
xml.push('<u:Expires>' + expires + '</u:Expires>');
xml.push('</u:Timestamp>');
xml.push('<xenc:EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">');
xml.push('<xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes256-cbc"/>');
xml.push('<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">');
xml.push('<e:EncryptedKey xmlns:e="http://www.w3.org/2001/04/xmlenc#">');
xml.push('<e:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p">');
xml.push('<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>');
xml.push('</e:EncryptionMethod>');
xml.push('<KeyInfo>');
xml.push('<o:SecurityTokenReference xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<X509Data>');
xml.push('<X509IssuerSerial>');
xml.push('<X509IssuerName>' + issuerNameX509 + '</X509IssuerName>');
xml.push('<X509SerialNumber>' + serialNumberX509 + '</X509SerialNumber>');
xml.push('</X509IssuerSerial>');
xml.push('</X509Data>');
xml.push('</o:SecurityTokenReference>');
xml.push('</KeyInfo>');
xml.push('<e:CipherData>');
xml.push('<e:CipherValue>' + token0 + '</e:CipherValue>');
xml.push('</e:CipherData>');
xml.push('</e:EncryptedKey>');
xml.push('</KeyInfo>');
xml.push('<xenc:CipherData>');
xml.push('<xenc:CipherValue>' + token1 + '</xenc:CipherValue>');
xml.push('</xenc:CipherData>');
xml.push('</xenc:EncryptedData>');
xml.push('<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">');
xml.push('<SignedInfo>');
xml.push('<CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>');
xml.push('<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1"/>');
xml.push('<Reference URI="#_0">');
xml.push('<Transforms>');
xml.push('<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>');
xml.push('</Transforms>');
xml.push('<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>');
xml.push('<DigestValue>' + digestValue + '</DigestValue>');
xml.push('</Reference>');
xml.push('</SignedInfo>');
xml.push('<SignatureValue>' + signatureValue + '</SignatureValue>');
xml.push('<KeyInfo>');
xml.push('<o:SecurityTokenReference xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">');
xml.push('<o:KeyIdentifier ValueType="http://docs.oasis-open.org/wss/oasis-wss-saml-token-profile-1.0#SAMLAssertionID">' + keyIdentifer + '</o:KeyIdentifier>');
xml.push('</o:SecurityTokenReference>');
xml.push('</KeyInfo>');
xml.push('</Signature>');
xml.push('</o:Security>');
xml.push('</s:Header>');
return xml.join('');
};
/// <summary>Gets the name of the AD FS server CRM uses for authentication.</summary>
/// <param name="url" type="String">The Url of the CRM On Premise (IFD) organization (https://org.domain.com).</param>
/// <returns type="String">The AD FS server url.</returns>
Xrm.CRMAuth.GetADFS = function (url) {
var adfsUrl = null;
var req = new XMLHttpRequest();
req.open('GET', url + '/XrmServices/2011/Organization.svc?wsdl=wsdl0', false);
req.setRequestHeader('Connection', 'Keep-Alive');
req.setRequestHeader('Content-Type', 'application/soap+xml; charset=UTF-8');
req.onreadystatechange = function () {
if (req.readyState === 4) {
if (req.status === 200) {
adfsUrl = $(req.response).find('ms-xrm\\:Identifier');
}
}
};
req.send();
return $(adfsUrl[0]).text().replace('http://', 'https://');
};
/// <summary>Creates a GUID.</summary>
/// <returns type="String">GUID.</returns>
Xrm.CRMAuth.CreateGuid = function () {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
};
///Cross browser base 64 encoding
/**
*
* Base64 encode / decode
* http://www.webtoolkit.info/
*
**/
var Base64 = {
// private property
_keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
// public method for encoding
encode: function (input) {
var output = '';
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = Base64._utf8_encode(input);
while (i < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
}
return output;
},
// public method for decoding
decode: function (input) {
var output = '';
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
while (i < input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = Base64._utf8_decode(output);
return output;
},
// private method for UTF-8 encoding
_utf8_encode: function (string) {
string = string.replace(/\r\n/g, '\n');
var utftext = '';
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if ((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
// private method for UTF-8 decoding
_utf8_decode: function (utftext) {
var string = '';
var i = 0;
var c = c1 = c2 = 0;
while (i < utftext.length) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if ((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i + 1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}
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