Key can be 128 byte key share or 32 byte key

Author: will-v-pi

tools/CMakeLists.txt

@@ -406,7 +406,8 @@ endfunction()
 
 # pico_encrypt_binary(TARGET AESFILE IVFILE [SIGFILE <file>] [EMBED] [MBEDTLS] [OTP_KEY_PAGE <page>])
 # Encrypt the target binary with the given AES key (should be a binary
-# file containing 128 bytes of a random key), and sign the encrypted binary.
+# file containing 128 bytes of a random key share, or 32 bytes of a random key),
+# and sign the encrypted binary.
 # Salts the public IV with the provided IVFILE (should be a binary file
 # containing 16 bytes of a random IV), to give the IV used by the encryption.
 # This sets PICOTOOL_AESFILE to AESFILE, PICOTOOL_IVFILE to IVFILE, and