Go high-performance encryption utility.
gohpenc highly resembles hpenc tool (https://github.com/vstakhov/hpenc).
+hpenc solves the problem that there is no simple tool to quickly
+transfer data with encryption and authentication:
-Why it was written? hpenc has some problems: it does not work on aarch64
-and sparc64 architectures under FreeBSD (as seen in the port's Makefile)
-and produces incompatible output (unauthenticated after 8192 blocks)
-between FreeBSD and HardenedBSD systems somehow. Instead of painful
-debugging I decided to write something similar on the Go language,
-widening supported platforms.
+* openssl enc -- uses single CPU, no authentication
+* GnuPG -- complex key generation/management, relatively slow
+* OpenSSH -- uses single CPU, not very fast
+
+Why gohpenc was written? hpenc has some problems: it does not work on
+aarch64 and sparc64 architectures under FreeBSD (as seen in the port's
+Makefile) and produces incompatible output (unauthenticated after 8192
+blocks) between FreeBSD and HardenedBSD systems somehow. Instead of
+painful debugging I decided to write something similar on the Go
+language, widening supported platforms.
gohpenc is incompatible with hpenc and much simpler:
* it uses only ChaCha20-Poly1305 algorithm
-* no random data generation mode -- just encrypt /dev/zero. Poly1305
- still be used, but it is fast enough to close eyes on it
+* no random data generation mode
* no metadata in output stream and no structure validation. Only blocks
authentication
* simpler key derivation -- new key for each block
dependent libraries contain assembly-optimized code
* Built-in authentication and integrity check with small data overhead
+Usage is very simple:
+
+ $ gohpenc -psk
+ DTGZI5R2HS4YEDSIO56AFKPONE6KJE3Q2QETODDOH3O6UYFPROHQ
+ $ echo "message to be transmitted" | gohpenc -k DTGZI5R2HS4YEDSIO56AFKPONE6KJE3Q2QETODDOH3O6UYFPROHQ > encrypted
+ $ gohpenc -k DTGZI5R2HS4YEDSIO56AFKPONE6KJE3Q2QETODDOH3O6UYFPROHQ -d < encrypted
+
How encryption/authentication is performed:
-* First 32 bytes of the stream contains random data, called salt
+* First 32 bytes of the stream contain random data -- salt
* BLAKE2X is initialized: unknown length, PSK key as a MAC key. It
creates XOF that will be used as a KDF
* Salt is fed into that XOF
| SALT | LEN | CIPHERTEXT | AUTH TAG | LEN | CIPHERTEXT | AUTH TAG | ...
+------+-----+------------+----------+-----+------------+----------+----
-gohpenc preallocates memory for one block for each thread. If you want
-to process data with 1 MiB blocks in 4 threads, then you have to have at
-least 4 MiBs of free memory. Moreover you have at least 1 MiB of free
-memory on the decrypting side.
+gohpenc preallocates memory for one block for each thread and one block
+for buffered reading from stdin. If you want to process data with 1 MiB
+blocks in 4 threads, then you have to have at least 5 MiBs of free
+memory. Moreover you have at least 1 MiB of free memory on the
+decrypting side.
gohpenc is free software: see the file COPYING for copying conditions.