Galois/Counter mode of the Advanced Encryption Standard: A mode of operation of the AES block cipher which both encrypts and authenticates its input data.
Questions tagged [aes-gcm]
393 questions
3
votes
1 answer
Java AES GCM Tag mismatch
I have a problem with Java AES GCM encryption. I have followed the instructions on this page to generate the following code:
package aes;
import java.nio.ByteBuffer;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import…
Lukas Nothhelfer
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3
votes
1 answer
Error decrypting message encrypted using AES/GCM/NoPadding in Android
I'm currently using AES/GCM/NoPadding to perform cipher operations.
My encryption code:
fun encrypt(plainText: ByteArray, key: Key): ByteArray? {
var resultText: ByteArray? = null
try {
val cipher =…
Jayaprakash Mara
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3
votes
1 answer
AES-256-GCM Python cryptography vs Rails OpenSSL
I'm updating a Python script to use cryptography's AESGCM primitive so it can interact with a Rails server running OpenSSL's AES-256-GCM implementation.
To begin, I'm simulating an encryption using identical message/key/nonce to see if both…
sscirrus
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3
votes
2 answers
Random access of encrypted data AES GCM mode
There is a very good example for random access AES CTR mode and it works:
Random access InputStream using AES CTR mode in android
private static final int AES_BLOCK_SIZE = 16;
private static IvParameterSpec calculateIVForOffset(final…
saganas
- 555
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- 12
3
votes
1 answer
correct nonce/iv size for AES-GCM mode
EDIT: The issue can be simplified to this:
The following Node.js code give an "Invalid IV length" Error. Why? What should the IV be?
const crypto = require('crypto')
const decipher = crypto.createDecipheriv('aes-128-gcm', crypto.randomBytes(16),…
QuinnFreedman
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3
votes
1 answer
PJSIP build doesn't find OpenSSL AES GCM support
When I try to build PJSIP 2.6 on Lubuntu 16.04 x86_64, it doesn't find AES GCM support, even though I have OpenSSL installed.
./configure | grep -e ssl -e SSL -e crypto
checking for OpenSSL installations..
checking openssl/ssl.h usability...…
Gabriel Vasconcelos
- 576
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3
votes
1 answer
Go encryption differs from Ruby encryption using same key and iv
I have the following Ruby code:
require 'base64'
require 'openssl'
data = '503666666'
key = '4768c01c4f598828ef80d9982d95f888fb952c5b12189c002123e87f751e3e82'
nonce = '4eFi6Q3PX1478767\n'
nonce = Base64.decode64(nonce)
c =…
content01
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3
votes
1 answer
Tag mismatch error in AES-256-GCM Decryption using Java
I have the following function written in Javascript for encryption using aes-256-gcm:
encrypt: function (text, masterkey){
try {
// random initialization vector
var iv = crypto.randomBytes(12);
// random salt
var…
Anish Hirlekar
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3
votes
1 answer
Android Cipher AES/GCM/NoPadding "iv==null"
Trying to encrypt and decrypt some data, on Marshmallow. Encryption works well, but when trying to decrypt, I'm getting a RuntimeException, saying "iv == null".
Basically, cipher.getIV() and cipher.getParameters() returns null.
Am I missing…
marius bardan
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3
votes
1 answer
Cannot find any provider supporting AES/GCM/NoPadding
We are trying to do encryption supporting AES/GCM/NoPadding in java 7 getting below exception.
Cannot find any provider supporting AES/GCM/NoPadding
Code sample for generating cipher instance is below.
SecretKeySpec eks = new SecretKeySpec(k,…
dReAmEr
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3
votes
1 answer
How to get authentication tag from AES-GCM
I'm using BouncyCastle to encrypt data in C#, using the AES256 GCM algorithm. For this I'm using the implementation provided by James Tuley. Below is a snippet of this code:
public byte[] SimpleEncrypt(byte[] secretMessage, byte[] key, byte[]…
Leon Cullens
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3
votes
1 answer
Use of AAD from AES-GCM
I'm working on a for-fun cryptography project in Java.
I'm struggling trying to understand Additional Associated Data use. From Cipher documentation and further online research I understood that AAD are appended to encrypted data and authenticated,…
Simone Errico
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3
votes
2 answers
Android : AES Encryption & Decryption using GCM mode in android?
I'm trying to Encrypt & Decrypt the String using AES Algorithm & GCM mode.
My code is able to encrypt the string but i'm not able to decrypt the encoded data.
Steps followed :
Create Key()
Encrypt(string)
Decrypt(encded_data);
My Code :
Create…
Uday
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3
votes
1 answer
AES-256-GCM mode decryption fails in php
Here's my code:
Pethő Jonatán
- 308
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3
votes
1 answer
using EVP_aes_128_gcm in openssl for aad with size of not multiple of 16
I am trying to use openssl EVP (EVP_aes_128_gcm) as interface for GMAC. I am testing the code against the NIST's CAVP GCM test vector (http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip).
The problem is: when the aad size is…
Tom
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