跨语言HMAC / SHA256 / Base64的问题

我正在使用node.js脚本为azure documentDB创build一个签名 – 简化版本是（结果在底部）： –

var crypto = require("crypto"); var masterKey = "ABCDE" var key = new Buffer(masterKey, "base64"); var signature = crypto.createHmac("sha256", key).update("FGHIJ").digest("base64"); console.log("\n\n"+signature) // RNkID54/1h1H9p3NWPeRA0mOW2L0c0HUJGTTY2GPbDo= 

这工作，并做我需要的。 我试图用CommonCrypto在Swift中做同样的事情

 let keyString = "ABCDE" let body = "FGHIJ" let utf8data = keyString.dataUsingEncoding(NSUTF8StringEncoding) let key = utf8data!.base64EncodedDataWithOptions(NSDataBase64EncodingOptions(rawValue: 0)) let str = body.cStringUsingEncoding(NSUTF8StringEncoding) let strLen = body.lengthOfBytesUsingEncoding(NSUTF8StringEncoding) let digestLen = Int(CC_SHA256_DIGEST_LENGTH) let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen) CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), key.bytes, key.length, str!, strLen, result); var hmacData = NSData(bytes: result, length: digestLen) var hmacBase64 = hmacData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0)) result.dealloc(digestLen) let signature = String(hmacBase64) let test = "RNkID54/1h1H9p3NWPeRA0mOW2L0c0HUJGTTY2GPbDo=" XCTAssert(test == signature, "Pass") 

但它返回一个完全不同的结果。 如果我直接将masterKey传递给javascript hmac，并将其作为string传入到Swift中的CCHmac方法中， 所以它似乎是find相当于这个的东西：

 var key = new Buffer(masterKey, "base64"); 

思考？

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更多信息 – 这个： –

 let keyString = "ABCDE" let body = "FGHIJ" let keyData = keyString.dataUsingEncoding(NSUTF8StringEncoding)! // .base64EncodedDataWithOptions(NSDataBase64EncodingOptions(rawValue: 0)) let bodyData = body.dataUsingEncoding(NSUTF8StringEncoding)! let digestLen = Int(CC_SHA256_DIGEST_LENGTH) let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen) CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), keyData.bytes, keyData.length, bodyData.bytes, bodyData.length, result); var hmacData = NSData(bytes: result, length: digestLen) var hmacBase64 = hmacData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0)) result.dealloc(digestLen) let signature = String(hmacBase64) let test = "FA372zbobgpTLI5cQWh5YFiFwkNhMI8womX4Cvw68YE=" // "RNkID54/1h1H9p3NWPeRA0mOW2L0c0HUJGTTY2GPbDo=" XCTAssert(test == signature, "Pass") 

产生与此相同的结果：

 var crypto = require("crypto"); var masterKey = "ABCDE" var signature = crypto.createHmac("sha256", masterKey).update("FGHIJ").digest("base64"); console.log("\n\n"+signature) // FA372zbobgpTLI5cQWh5YFiFwkNhMI8womX4Cvw68YE=