aes | 易学教程

Decryption at client side using java

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问题 I encypted the session Id at server side but when I am trying to decrypt the session id at client side some error is coming. please can anyone help resolving the error. public static String decrypt(String sessionId) { try { Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING"); final SecretKeySpec secretKey = new SecretKeySpec(key, "AES"); cipher.init(Cipher.DECRYPT_MODE, secretKey); final String decryptedSessionId = new String(cipher.doFinal(Base64.decodeBase64(sessionId))); return

SOAP response MTOM attachment can't be decrypted (AES algorithm)

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问题 I'm working on the soap client and have a problem with reading (and decryption) of the response attachment. The attachment is included into the the response using MTOM mechanism and encrypted via AES128-CBC algorithm (the secret key is included to the response xml header). Here is the basic structure of the response: <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope> .. the xml data that includes the secret key for the attachment decryption usign AES algorithm. </soapenv:Envelope> -

How do you use AES to Encrypt in One Program, Decrypt in Another

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问题 I was told not to use RSA to encrypt simple text but to use AES. I found a simple piece of code to implement AES: public static class Crypto { #region Settings private static int _iterations = 2; private static int _keySize = 256; private static string _hash = "SHA1"; private static string _salt = "aselrias38490a32"; // Random private static string _vector = "8947az34awl34kjq"; // Random #endregion public static string Encrypt(string value, string password) { return Encrypt<AesManaged>(value,

AES-Encrypt-then-MAC a large file with .NET

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I want to encrypt a large file (lets say 64 GB) in the most efficient way in .NET. How I would implement this: Create an instance of AesManaged to encrypt the stream of the file (read 64 GB) Save this stream to disk (because it is to big to hold in memory) (write 64 GB) Create an instance of HMACSHA512 to compute hash of the saved file (read 64 GB) Save encrypted data with iv to disk (read & write 64 GB) Simplified C# Code: using (var aesManaged = new AesManaged()) { using (var msEncrypt = File.OpenWrite(@"C:\Temp\bigfile.bin.tmp")) { using (var csEncrypt = new CryptoStream(msEncrypt,

AES decryption with bouncy castle

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问题 I am attempting to adapt the sample code at http://www.java2s.com/Code/Java/Security/Basicsymmetricencryptionexample.htm to have to be invoked with 3 arguments, the mode (encryption or decryption), IV and the key. It also reads and writes to specific files. As of right now I am ignoring the given IV and key until I get the rest up and running. My code successfully encrypts plaintext from a file, and writes the ciphertext to a file, but the decryption does not work. It appears that decryption

Java AES Decrypting problem

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问题 I have been tasked with decrypting a file in Java that has been encrypted using the following criteria: AES encryption algorithm with 128-bit key, ECB mode and PKCS7 padding. The encrypted file format is: - first byte is hex 0x31 – specifying encryption method used (1 for AES) - followed by the encrypted bytes of the input file I must also download the file, so here is my attempt so far: The download code, I skip the first byte here as it is not required and is not encrypted: final String

DCPCrypt/Delphi not properly encoding Rijndael

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I have the DCPCrypt package (latest version) and am trying to do AES/Rijndael CBC encoding (128 bit blocks, 256 bit key) in Delphi2007 with test values from the AES Known Answer Test (KAT) Vectors distributed by NIST. One sample test vector: KEY = 0000000000000000000000000000000000000000000000000000000000000000 IV = 00000000000000000000000000000000 PLAINTEXT = 80000000000000000000000000000000 CIPHERTEXT = ddc6bf790c15760d8d9aeb6f9a75fd4e The code below returns: Cyphertext (bytes): 58 215 142 114 108 30 192 43 126 191 233 43 35 217 236 52 Cyphertext (hex): 3AD78E726C1EC02B7EBFE92B23D9EC34

AES BadPaddingException

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问题 if I use a wrong key or wrong salt for decryption an BadPaddingException is thrown. I would expect an incorrect string to be returned. The doFinal() causes the exception in the decrypt-method Message : This is just an example Unfug : 'ΩÙΩ„SåF?V®ßs.k˚·ºç€èÀHﬁf∫ÙÉÕ Exception in thread "main" javax.crypto.BadPaddingException: Given final block not properly padded at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..) at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..) at com.sun.crypto.provider

Android android.credentials.UNLOCK Initializing keystore without password

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问题 Having a random key to encrypt local credentials through AES, I'm following the below tutorial to try to store securely that key and then be able to decrypt later on: nelenkov.blogspot.co.uk storing applicationsecrets in androids This tutorial explains how access to the system keystore and store your passwords in it. The issue I'm facing it's focused in the call to UNLOCK ( android.credentials.UNLOCK ) the KeyStore. Devices (at the moment with API below 14) that don't have KeyStore

AES/CFB8 IV size

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AFAIK, CFB8 mode has block size of 1byte. So I can induce that IV is also 1byte length. However, when I do a test passing same iv of just 1 byte into common crypto create function for encrypt and decrypt function, encrypted and decrypted message mismatch. So I think that the API should have taken more than 1 byte to use as IV. I would like to know why? Any thing wrong with my understanding? CCCryptorStatus result = CCCryptorCreateWithMode(operation, kCCModeCFB8, kCCAlgorithmAES128, ccNoPadding, iv.bytes, key.bytes, key.length, NULL, 0, 0, 0, &_cryptor); if (result == kCCSuccess) result =