Bitmessage white paper mac#

Public key, 0x04 prefix, then 32 bytes X and 32 bytes Y.ġ6 bytes generated with a secure random number generator. Decrypt the cipher text with AES-256-CBC, using IV as initialization vector, key_e as decryption key and the cipher text as payload.Calculate MAC' with HMACSHA256, using key_m as salt and IV + R + cipher text as data.

Do an EC point multiply with private key k and public key R.

The private key used to decrypt is called k.

Bitmessage white paper mac#

The resulting data is: IV + R + cipher text + MAC Calculate a 32 byte MAC with HMACSHA256, using key_m as salt and IV + R + cipher text as data.Encrypt the data with AES-256-CBC, using IV as initialization vector, key_e as encryption key and the padded input text as payload.Pad the input text to a multiple of 16 bytes, in accordance to PKCS7.The first 32 bytes of H are called key_e and the last 32 bytes are called key_m.Use the X component of public key P and calculate the SHA512 hash H.Do an EC point multiply with public key K and private key r.Generate a new random EC key pair with private key called r and public key called R.Generate 16 random bytes using a secure random number generator.The destination public key is called K.In order to reconstitute a usable (65 byte) public key (starting with 0x04), the X and Y components need to be expanded by prepending them with 0x00 bytes until the individual component lengths are 32 bytes. Initialization Vector used for AES-256-CBC