-- Dr Stephen N. Henson. It needs to be 32 bytes, but hex convert gives me 64 bytes..key file in hex: Copy link Author sivakrishna0205 commented Jan 23, 2018. Each one takes one of PEM, DER or NET (a dated Netscape format, which you can ignore).. You can change a key from one format to the other with the openssl rsa command (assuming it's an RSA key, of course): The Payload file from the downloaded notification zip file is needed as well as the 64 character hex key string. openssl aes-128-cbc -d -in I00100000.ts -out decrypt_I00100000.ts -nosalt -iv -K I have hex IV from .m3u8, but how can I obtain hex from my .key file? 308202C6304006092A864886F70D01050D30...'. Actually, "openssl dsa" does understand keys in binary format by specifying the "-inform DER" option, as pointed by Dan Lukes in the Web version. If only the key is specified, the IV must additionally specified using the -iv option. Hex value shall be PKCS#1 private key formatted value which is ASN.1 DER encoded. Instead you can use md5 and shasum -a. When both a key and a password are specified, the key given with the -K option will be used and … JNI looks like the most effective option possibly round a very simple wrapper function but I'm not familiar with it. To convert from one to the other you can use openssl with the -inform and -outform arguments. ** openssl ec -in k.pem -text. I give the hex formatted data like ASN.1 DER encoded but RSA Private key generated is different. I could extend the openssl utility to support a hex key on the command line: it makes sense to do that anyway. If you have an older version of OpenSSL (pre 1.0) - no matter what operating system - then you may try the above commands instead. Steve. 9. A PEM file is simply a DER file that's been Base64 encoded. How do I do this the other way around? To generate such a key, use OpenSSL as: openssl rand 16 > myaes.key AES-256 expects a key of 256 bit, 32 byte. 2 Answers Active Oldest Votes. I found that this OpenSSL command may help. Hi thanks for your information. the actual key to use: this must be represented as a string comprised only of hex digits. With your private key in hand, you can use the following command to see the key's details, such as its modulus and its constituent primes. Hi Edwin, Is this key is PKCS#8 encrypted private key by DES-DES3-CBC? Instead of -mac hmac -macopt hexkey:KEY use -hmac KEY. $ openssl pkey -in private-key.pem -text The above command yields the following output in my specific case. To generate such a key, use: openssl rand 32 > myaes.key – ingenue Oct 12 '17 at 11:57 | show 1 more comment. ** The strange part is openssl provides the ability to output my PEM as -text which gives the hex. The Payload file from the downloaded notification zip file is needed as well as the 64 character hex key string (AES key) and 32 character hex string (IV). 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