base64

问题 I have some problems to verify the signature of a JWT token I get. The token is signed with HS256. The code where I try to create a signature to proof the received one is: JwtSecurityToken token = tokenHandler.ReadJwtToken(tokenString); byte[] keyBytes = Encoding.UTF8.GetBytes("secret"); HMACSHA256 hmac = new HMACSHA256(keyBytes); byte[] signatureBytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(token.RawHeader + "." + token.RawPayload)); string signature = Convert.ToBase64String(signatureBytes

问题 I am writing an App which does the following with a given String str: encode(encrypt(encode(stringToBytearray(str)))); The Server receives the Base64 encoded String, which is then decoded -> decrypted -> decoded, to get the sent String str from the App. Unfortunately it doesnt work for all Strings, long Strings lead to a long Base64 String and my Server throws the following Exception: Exception in thread "main" java.lang.IllegalArgumentException: Illegal base64 character 5b at java.util

问题 I'm getting a base64 string from android side. I have to convert it into an audio file and have to save it into a folder. I thought I have to convert it first into byte array. Then after it, I have to convert it into a mp3 file. But don't know how. I have done work in base64 to image. If anyone know answer then please explain with an example. Thank You. 回答1: If the base64 encoded data already represents an MP3 file, it should be as easy as decoding the base64 data and storing it in a file:

问题 I'm getting a base64 string from android side. I have to convert it into an audio file and have to save it into a folder. I thought I have to convert it first into byte array. Then after it, I have to convert it into a mp3 file. But don't know how. I have done work in base64 to image. If anyone know answer then please explain with an example. Thank You. 回答1: If the base64 encoded data already represents an MP3 file, it should be as easy as decoding the base64 data and storing it in a file:

问题 I've pulled an image from Microsoft graphQL and applied the following before storing the string in vuex. Buffer.from(image).toString('base64') Inside my component I'm trying to render the image in the following way <img class="shadow avatar border-white" :src="`data:image/jpg;base64,${this.$store.state.user.profilePhoto}`"/> I've tried adding the charset-utf-8 into the mix and a few variations including different image types including png and jpeg. The CSS class simply rounds the image and

问题 I have small thumbnails stored in a MongoDB collection. While I can extract them with a .findOne() I can not serve them back over an ExpressJS route correctly. I am not storing thumbs on disk as the heroku environment does not guarantee persisted storage. I am not using GridFS as these are thumbs < 16MB. Inserting a a new document into the collection goes something like this: MongoClient.connect(url, function(err, db){ var newImg = fs.readFileSync(req.file.path); var encImg = newImg.toString(

问题 I have small thumbnails stored in a MongoDB collection. While I can extract them with a .findOne() I can not serve them back over an ExpressJS route correctly. I am not storing thumbs on disk as the heroku environment does not guarantee persisted storage. I am not using GridFS as these are thumbs < 16MB. Inserting a a new document into the collection goes something like this: MongoClient.connect(url, function(err, db){ var newImg = fs.readFileSync(req.file.path); var encImg = newImg.toString(

问题 I am trying to create the signature string needed for Azure Storage Tables as described here: https://docs.microsoft.com/en-us/rest/api/storageservices/authorize-with-shared-key#encoding-the-signature The Access key is "p1qPD2lBiMlDtl/Vb/T/Xt5ysd/ZXNg5AGrwJvtrUbyqiAQxGabWkR9NmKWb8Jhd6ZIyBd9HA3kCRHr6eveKaA==" The failing code is: property AccessKey: string read FAccessKey write SetAccessKey; function TAzureStorageAPI.GetAuthHeader(StringToSign: UTF8String): UTF8String; var AccessKey64: string;

问题 We have a small feature on our site which allows users to upload a profile picture. This picture will then be stored in our Postgres database as a base-64 encoded string. My question concerns the data scheme used in an <img> URL to render a base-64 encoded string, e.g. <img src="data:image/gif;base64,iVBORw0KGgo ..."> ^^^ but what if we don't know the extension? We plan on simply storing a base-64 blob and nothing else. But in this case, how could we know what extension was used in the

问题 I saved the whole message as xx.eml, but some mails body tells that mail is encoding by base64 at the first line, for example: charset="utf-8" Content-Transfer-Encoding: base64 charset="gb2312" Content-Transfer-Encoding: base64 I tried to get the keys of body[0][1] , but there is no content-transfer-encoding field (only content-type). How can I process that mails? def saveMail(conn, num): typ, body = conn.fetch(num, 'RFC822') message = open(emldirPath + '\\' + num + '.eml', 'w+') message