pkcs#5

问题 I have been tasked with replacing a legacy java system with something which runs PHP. I am getting a little stuck on replacing the java cryptography with PHP code. cipherAlgorythm = "PBEWithMD5AndDES"; cipherTransformation = "PBEWithMD5AndDES/CBC/PKCS5Padding"; PBEParameterSpec ps = new javax.crypto.spec.PBEParameterSpec(salt, iterations); SecretKeyFactory kf = SecretKeyFactory.getInstance(cipherAlgorythm); SecretKey key = kf.generateSecret(new javax.crypto.spec.PBEKeySpec(password

问题 I have been tasked with replacing a legacy java system with something which runs PHP. I am getting a little stuck on replacing the java cryptography with PHP code. cipherAlgorythm = "PBEWithMD5AndDES"; cipherTransformation = "PBEWithMD5AndDES/CBC/PKCS5Padding"; PBEParameterSpec ps = new javax.crypto.spec.PBEParameterSpec(salt, iterations); SecretKeyFactory kf = SecretKeyFactory.getInstance(cipherAlgorythm); SecretKey key = kf.generateSecret(new javax.crypto.spec.PBEKeySpec(password

问题 I have been tasked with replacing a legacy java system with something which runs PHP. I am getting a little stuck on replacing the java cryptography with PHP code. cipherAlgorythm = "PBEWithMD5AndDES"; cipherTransformation = "PBEWithMD5AndDES/CBC/PKCS5Padding"; PBEParameterSpec ps = new javax.crypto.spec.PBEParameterSpec(salt, iterations); SecretKeyFactory kf = SecretKeyFactory.getInstance(cipherAlgorythm); SecretKey key = kf.generateSecret(new javax.crypto.spec.PBEKeySpec(password

问题 I'm having troubles to extract the IV generated with the encrypt method from encrypted_strings library for a specific password I provide. From the documentation, I see that this method generates a key and iv based on a password using a C library that calls the same method as openssl to generate the key and iv: EVP_BytesToKey. What I'm trying to do is to be able to print the IV for any password I specify so I can port the encryption to another language. Can you think of any method to extract

问题 I'm decrypting some java encrypted text with OpenSSL. Reading this post I wrote the following code. unsigned int i = 0; printf("Out array - Before\n"); for(i = 0; i < sizeof(out); i++) { if(i % 32 == 0) printf("\n"); printf("%02X", out[i]); } printf("\n"); AES_set_decrypt_key((const unsigned char *)a.at(3).c_str(), 128, &aesKey_); for(i = 0; i < sizeof(bytes); i += AES_BLOCK_SIZE) { std::cout << "Decrypting at " << i << " of " << sizeof(bytes) << "\n"; AES_ecb_encrypt(bytes + i, out + i,

问题 I've been wrestling with decrypting a given string, generated by a remote ColdFusion server, in PHP using AES in CBC mode with PKCS5 padding. I've gotten to the point where I can decrypt the string almost perfectly, the issue is there appears to be some cruft at the beginning of the string. I thought padding happened at the end, but looking at the decrypted string, there's nothing at the end, but the beginning is padded out so the string is 64 characters long (the original string is 32

问题 This is the code I use to "hash" (or derive key as called in the PBKDF2 implementation of the PKCS standard) passwords strings with the Rfc2898DeriveBytes class provided in .NET: int saltSize = 256; int iterations = 1000; int keySize = 20; // The parameter I'm not sure of var deriveBytes = new Rfc2898DeriveBytes("mypassword", saltSize, iterations); byte[] salt = deriveBytes.Salt; byte[] key = deriveBytes.GetBytes(keySize); Now, I understand that the salt size doesn't matter much (as long as

问题 I dont know how to use the "salt concept" in my scenario. Suppose I have a client desktop application that encrypts data for specific users and send it to a remote server. The client application generate a key with PKCS#5, with the user's password and a SALT. The remote desktop must NEVER be in contact with the user's password. Suppose we generate a random salt for an encryption. The client application can encrypt the data, and sent it to the remote server. If the user try to access his data

问题 I need to encrypt a string using DESede pkcs5 padding. However C# only provides PKCS7 padding. So how can I achieve this? 回答1: Im no authority on the matter but a quick google turned this up: http://social.msdn.microsoft.com/Forums/en-US/csharplanguage/thread/13a20d89-7d84-4f7d-8f5c-5ae108a7f5cf/ Seems the 7 & 5 padding algs. are the same. 回答2: Try using a separate library, such as BouncyCastle. 来源： https://stackoverflow.com/questions/8614997/pkcs5padding-in-c-sharp

问题 I was wondering how openssl handles a message that is dividable by 8 bytes when using AES-128-CBC. How can openssl detect that there is no padding (PKCS#5/PKCS#7) to be removed? Especially when the message ends in a character with an ASCII code less than or equal to 8. I hope my question is clear. Thanks 回答1: Well the answer is that padding is always added, even if the data can be divided by the block size. Thus a 8 byte string will be padded with 8 bytes (with ASCII code 8). 来源： https:/