def _3user():
eA = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
pA = nacl.crypto_scalarmult_curve25519_base(eA)
print("A public: \t%s\nA exp: \t%s" % (b85encode(pA), b85encode(eA)))
eB = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
pB = nacl.crypto_scalarmult_curve25519_base(eB)
print("B public: \t%s\nB exp: \t%s" % (b85encode(pB), b85encode(eB)))
eC = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
pC = nacl.crypto_scalarmult_curve25519_base(eC)
print("C public: \t%s\nC exp: \t%s" % (b85encode(pC), b85encode(eC)))
print()
pAB = nacl.crypto_scalarmult_curve25519(eB, pA)
print("public AB", b85encode(pAB))
pBA = nacl.crypto_scalarmult_curve25519(eA, pB)
print("public BA", b85encode(pBA))
pCA = nacl.crypto_scalarmult_curve25519(eA, pC)
print("public CA", b85encode(pCA))
print()
key = nacl.crypto_scalarmult_curve25519(eB, pCA)
print("key: \t%s" % (b85encode(key)))
key = nacl.crypto_scalarmult_curve25519(eC, pBA)
print("key: \t%s" % (b85encode(key)))
key = nacl.crypto_scalarmult_curve25519(eC, pAB)
print("key: \t%s" % (b85encode(key)))
def _3user():
eA = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
pA = nacl.crypto_scalarmult_curve25519_base(eA)
print "A public: \t%s\nA exp: \t%s" % (b85encode(pA), b85encode(eA))
eB = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
pB = nacl.crypto_scalarmult_curve25519_base(eB)
print "B public: \t%s\nB exp: \t%s" % (b85encode(pB), b85encode(eB))
eC = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
pC = nacl.crypto_scalarmult_curve25519_base(eC)
print "C public: \t%s\nC exp: \t%s" % (b85encode(pC), b85encode(eC))
print
pAB = nacl.crypto_scalarmult_curve25519(eB, pA)
print "public AB", b85encode(pAB)
pBA = nacl.crypto_scalarmult_curve25519(eA, pB)
print "public BA", b85encode(pBA)
pCA = nacl.crypto_scalarmult_curve25519(eA, pC)
print "public CA", b85encode(pCA)
print
key = nacl.crypto_scalarmult_curve25519(eB, pCA)
print "key: \t%s" % (b85encode(key))
key = nacl.crypto_scalarmult_curve25519(eC, pBA)
print "key: \t%s" % (b85encode(key))
key = nacl.crypto_scalarmult_curve25519(eC, pAB)
print "key: \t%s" % (b85encode(key))
def send(self, plain):
# update context
if self.peer_pub != (b'\0' * nacl.crypto_scalarmult_curve25519_BYTES):
# calculate a new incoming key, and finish that DH, start a new for
# outgoing keys.
# only do this directly after receiving a packet, not on later sends
# without receiving any acks before, we reset peer_pub to signal, that
# an incoming request has been already once processed like this.
self.e_in = nacl.randombytes(
nacl.crypto_scalarmult_curve25519_BYTES)
self.in_prev = self.in_k
self.in_k = nacl.crypto_scalarmult_curve25519(
self.e_in, self.peer_pub)
self.peer_pub = (b'\0' * nacl.crypto_scalarmult_curve25519_BYTES)
# generate e_out
self.e_out = nacl.randombytes(
nacl.crypto_scalarmult_curve25519_BYTES)
elif self.out_k == (b'\0' * nacl.crypto_secretbox_KEYBYTES):
# only for the very first packet necessary
# we explicitly need to generate e_out
self.e_out = nacl.randombytes(
nacl.crypto_scalarmult_curve25519_BYTES)
# compose packet
dh1 = nacl.crypto_scalarmult_curve25519_base(self.e_out)
dh2 = (nacl.crypto_scalarmult_curve25519_base(self.e_in)
if self.e_in !=
(b'\0' * nacl.crypto_scalarmult_curve25519_BYTES) else
(b'\0' * nacl.crypto_scalarmult_curve25519_BYTES))
plain = b''.join((dh1, dh2, plain))
# encrypt the whole packet
return self.encrypt(plain)
def send(self,plain):
# update context
if self.peer_pub != (b'\0' * nacl.crypto_scalarmult_curve25519_BYTES):
# calculate a new incoming key, and finish that DH, start a new for
# outgoing keys.
# only do this directly after receiving a packet, not on later sends
# without receiving any acks before, we reset peer_pub to signal, that
# an incoming request has been already once processed like this.
self.e_in = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
self.in_prev = self.in_k
self.in_k = nacl.crypto_scalarmult_curve25519(self.e_in, self.peer_pub)
self.peer_pub = (b'\0' * nacl.crypto_scalarmult_curve25519_BYTES)
# generate e_out
self.e_out = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
elif self.out_k == (b'\0' * nacl.crypto_secretbox_KEYBYTES):
# only for the very first packet necessary
# we explicitly need to generate e_out
self.e_out = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
#else: # axolotlize
# print 'axolotl!'
# self.out_k = nacl.crypto_generichash(self.out_k,
# nacl.crypto_scalarmult_curve25519(self.me_id.cs, self.peer_id.cp),
# nacl.crypto_scalarmult_curve25519_BYTES)
# compose packet
dh1 = nacl.crypto_scalarmult_curve25519_base(self.e_out)
dh2 = (nacl.crypto_scalarmult_curve25519_base(self.e_in)
if self.e_in != (b'\0' * nacl.crypto_scalarmult_curve25519_BYTES)
else (b'\0' * nacl.crypto_scalarmult_curve25519_BYTES))
plain = b''.join((dh1, dh2, plain))
# encrypt the whole packet
return self.encrypt(plain)
def _2user():
# 1st user
exp1 = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public1 = nacl.crypto_scalarmult_curve25519_base(exp1)
#print("public1: \t%s\nexp1: \t%s" % (b85encode(public1), b85encode(exp1)))
print()
# 2nd user
exp2 = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public2 = nacl.crypto_scalarmult_curve25519_base(exp2)
key = nacl.crypto_scalarmult_curve25519(exp2, public1)
print("key: \t%s" % (b85encode(key)))
#print("public2: \t%s\nkey: \t%s" % (b85encode(public2), b85encode(key)))
print()
# 1st user completing DH
key = nacl.crypto_scalarmult_curve25519(exp1, public2)
print("key: \t%s" % (b85encode(key)))
def _2user():
# 1st user
exp1 = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public1 = nacl.crypto_scalarmult_curve25519_base(exp1)
# print "public1: \t%s\nexp1: \t%s" % (b85encode(public1), b85encode(exp1))
print
# 2nd user
exp2 = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public2 = nacl.crypto_scalarmult_curve25519_base(exp2)
key = nacl.crypto_scalarmult_curve25519(exp2, public1)
print "key: \t%s" % (b85encode(key))
# print "public2: \t%s\nkey: \t%s" % (b85encode(public2), b85encode(key))
print
# 1st user completing DH
key = nacl.crypto_scalarmult_curve25519(exp1, public2)
print "key: \t%s" % (b85encode(key))
def __generate_esk(self, topic, usage):
# ephemeral keys are use once only, so always ok to overwrite
# caller must hold self.__eklock prior to calling
if not topic in self.__esk or not topic in self.__epk:
self.__esk[topic] = {}
self.__epk[topic] = {}
self.__esk[topic][usage] = pysodium.randombytes(pysodium.crypto_scalarmult_curve25519_BYTES)
self.__epk[topic][usage] = pysodium.crypto_scalarmult_curve25519_base(self.__esk[topic][usage])
def dh1_handler():
exp = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public = nacl.crypto_scalarmult_curve25519_base(exp)
(sys.stdout.buffer if hasattr(sys.stdout, 'buffer') else
sys.stdout).write(b"public component " + b85encode(public) + b'\n')
(sys.stdout.buffer if hasattr(sys.stdout, 'buffer') else
sys.stdout).write(b"secret exponent " + b85encode(exp) + b'\n')
clearmem(exp)
def dh2_handler(peer):
# provides a high level interface to receive a DH key exchange
# request peer contains the public component generated by the peer
# when initiating an DH exchange
exp = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public = nacl.crypto_scalarmult_curve25519_base(exp)
secret = nacl.crypto_scalarmult_curve25519(exp, b85decode(peer))
return (public, secret)
def dh2_handler(peer):
# provides a high level interface to receive a DH key exchange
# request peer contains the public component generated by the peer
# when initiating an DH exchange
exp = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public = nacl.crypto_scalarmult_curve25519_base(exp)
secret = nacl.crypto_scalarmult_curve25519(exp, peer)
return (public, secret)
def mpecdh1(self, keyring = []):
self.key = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
keyring = [nacl.crypto_scalarmult_curve25519(self.key, public)
for public in keyring]
keyring.append(nacl.crypto_scalarmult_curve25519_base(self.key))
if len(keyring) == int(self.peers): # we are last, remove our own secret
self.secret = keyring[0]
keyring = keyring[1:]
return keyring
def dh2_handler(peer):
exp = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public = nacl.crypto_scalarmult_curve25519_base(exp)
(sys.stdout.buffer if hasattr(sys.stdout, 'buffer') else
sys.stdout).write(b"public component " + b85encode(public) + b'\n')
secret = nacl.crypto_scalarmult_curve25519(exp, b85decode(peer))
(sys.stdout.buffer if hasattr(sys.stdout, 'buffer') else
sys.stdout).write(b"shared secret " + b85encode(secret) + b'\n')
clearmem(secret)
clearmem(exp)
def mpecdh(self, keyring=[]):
if self.secret:
return self.secret
if not self.key:
self.key = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
keyring = [nacl.crypto_scalarmult_curve25519(self.key, public) for public in keyring]
keyring.append(nacl.crypto_scalarmult_curve25519_base(self.key))
if len(keyring) == self.peers: # we are last, remove our own secret
self.secret = keyring[0]
keyring = keyring[1:]
else:
self.secret = nacl.crypto_scalarmult_curve25519(self.key, keyring[0])
keyring = [nacl.crypto_scalarmult_curve25519(self.key, public) for public in keyring[1:]]
clearmem(self.key)
self.key = None
self.next.mpecdh(keyring)
def mpecdh(self, keyring = []):
if self.secret: return self.secret
if not self.key:
self.key = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
keyring = [nacl.crypto_scalarmult_curve25519(self.key, public)
for public in keyring]
keyring.append(nacl.crypto_scalarmult_curve25519_base(self.key))
if len(keyring) == self.peers: # we are last, remove our own secret
self.secret = keyring[0]
keyring = keyring[1:]
else:
self.secret = nacl.crypto_scalarmult_curve25519(self.key, keyring[0])
keyring = [nacl.crypto_scalarmult_curve25519(self.key, public)
for public in keyring[1:]]
clearmem(self.key)
self.key = None
self.next.mpecdh(keyring)
def new(self):
self.sk = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
self.pk = nacl.crypto_scalarmult_curve25519_base(self.sk)
return self
def dh1_handler():
# provides a high level interface to start a DH key exchange
exp = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public = nacl.crypto_scalarmult_curve25519_base(exp)
return (exp, public)
def dh1_handler():
# provides a high level interface to start a DH key exchange
exp = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
public = nacl.crypto_scalarmult_curve25519_base(exp)
return (exp, public)
def test_crypto_scalarmut_curve25519_base(self):
s = pysodium.crypto_scalarmult_curve25519_base(pysodium.randombytes(pysodium.crypto_scalarmult_BYTES))
r = pysodium.crypto_scalarmult_curve25519_base(pysodium.randombytes(pysodium.crypto_scalarmult_BYTES))
pysodium.crypto_scalarmult_curve25519(s, r)
def test_crypto_scalarmult_curve25519_base(self):
s = pysodium.crypto_scalarmult_curve25519_base(
pysodium.randombytes(pysodium.crypto_scalarmult_BYTES))
r = pysodium.crypto_scalarmult_curve25519_base(
pysodium.randombytes(pysodium.crypto_scalarmult_BYTES))
pysodium.crypto_scalarmult_curve25519(s, r)
def test_crypto_box_pk_from_sk(self):
pk1, sk = pysodium.crypto_box_keypair()
pk2 = pysodium.crypto_scalarmult_curve25519_base(sk)
self.assertEqual(pk1, pk2)
def test_pysodium():
"""
Test all the functions needed from pysodium libarary (libsodium)
"""
# crypto_sign signatures with Ed25519 keys
# create keypair without seed
verkey, sigkey = pysodium.crypto_sign_keypair()
assert len(verkey) == 32 == pysodium.crypto_sign_PUBLICKEYBYTES
assert len(sigkey) == 64 == pysodium.crypto_sign_SECRETKEYBYTES
assert 32 == pysodium.crypto_sign_SEEDBYTES
sigseed = pysodium.randombytes(pysodium.crypto_sign_SEEDBYTES)
assert len(sigseed) == 32
# seed = (b'J\xeb\x06\xf2BA\xd6/T\xe1\xe2\xe2\x838\x8a\x99L\xd9\xb5(\\I\xccRb\xc8\xd5\xc7Y\x1b\xb6\xf0')
# Ann's seed
sigseed = (
b'PTi\x15\xd5\xd3`\xf1u\x15}^r\x9bfH\x02l\xc6\x1b\x1d\x1c\x0b9\xd7{\xc0_\xf2K\x93`'
)
assert len(sigseed) == 32
# try key stretching from 16 bytes using pysodium.crypto_pwhash()
assert 16 == pysodium.crypto_pwhash_SALTBYTES
salt = pysodium.randombytes(pysodium.crypto_pwhash_SALTBYTES)
assert len(salt) == 16
# salt = b'\x19?\xfa\xc7\x8f\x8b\x7f\x8b\xdbS"$\xd7[\x85\x87'
# algorithm default is argon2id
sigseed = pysodium.crypto_pwhash(
outlen=32,
passwd="",
salt=salt,
opslimit=pysodium.crypto_pwhash_OPSLIMIT_INTERACTIVE,
memlimit=pysodium.crypto_pwhash_MEMLIMIT_INTERACTIVE,
alg=pysodium.crypto_pwhash_ALG_DEFAULT)
assert len(sigseed) == 32
# seed = (b'\xa9p\x89\x7f+\x0e\xc4\x9c\xf2\x01r\xafTI\xc0\xfa\xac\xd5\x99\xf8O\x8f=\x843\xa2\xb6e\x9fO\xff\xd0')
# creates signing/verification key pair from seed
verkey, sigkey = pysodium.crypto_sign_seed_keypair(sigseed)
assert len(verkey) == 32
assert len(sigkey) == 64
# sigkey is seed and verkey concatenated. Libsodium does this as an optimization
# because the signing scheme needs both the private key (seed) and the public key so
# instead of recomputing the public key each time from the secret key it requires
# the public key as an input of and instead of two separate inputs, one for the
# secret key and one for the public key, it uses a concatenated form.
# Essentially crypto_sign_seed_keypair and crypto_sign_keypair return redundant
# information in the duple (verkey, sigkey) because sigkey includes verkey
# so one could just store sigkey and extract verkey or sigseed when needed
# or one could just store verkey and sigseed and reconstruct sigkey when needed.
# crypto_sign_detached requires sigkey (sigseed + verkey)
# crypto_sign_verify_detached reqires verkey only
# https://crypto.stackexchange.com/questions/54353/why-are-nacl-secret-keys-64-bytes-for-signing-but-32-bytes-for-box
assert sigseed == sigkey[:32]
assert verkey == sigkey[32:]
assert sigkey == sigseed + verkey
# vk = (b'B\xdd\xbb}8V\xa0\xd6lk\xcf\x15\xad9\x1e\xa7\xa1\xfe\xe0p<\xb6\xbex\xb0s\x8d\xd6\xf5\xa5\xe8Q')
# utility function to extract seed from secret sigkey (really just extracting from front half)
assert sigseed == pysodium.crypto_sign_sk_to_seed(sigkey)
assert 64 == pysodium.crypto_sign_BYTES
msg = "The lazy dog jumped over the river"
msgb = msg.encode(
"utf-8") # must convert unicode string to bytes in order to sign it
assert msgb == b'The lazy dog jumped over the river'
sig = pysodium.crypto_sign_detached(msgb, sigseed +
verkey) # sigkey = seed + verkey
assert len(sig) == 64
"""
sig = (b"\x99\xd2<9$$0\x9fk\xfb\x18\xa0\x8c@r\x122.k\xb2\xc7\x1fp\x0e'm\x8f@"
b'\xaa\xa5\x8c\xc8n\x85\xc8!\xf6q\x91p\xa9\xec\xcf\x92\xaf)\xde\xca'
b'\xfc\x7f~\xd7o|\x17\x82\x1d\xd4<o"\x81&\t')
"""
#siga = pysodium.crypto_sign(msg.encode("utf-8"), sk)[:pysodium.crypto_sign_BYTES]
#assert len(siga) == 64
#assert sig == siga
try: # verify returns None if valid else raises ValueError
result = pysodium.crypto_sign_verify_detached(sig, msgb, verkey)
except Exception as ex:
assert False
assert not result
assert result is None
sigbad = sig[:-1]
sigbad += b'A'
try: # verify returns None if valid else raises ValueError
result = pysodium.crypto_sign_verify_detached(sigbad, msgb, verkey)
except Exception as ex:
assert True
assert isinstance(ex, ValueError)
# crypto_box authentication encryption with X25519 keys
apubkey, aprikey = pysodium.crypto_box_keypair()
assert len(apubkey) == 32 == pysodium.crypto_box_SECRETKEYBYTES
assert len(aprikey) == 32 == pysodium.crypto_box_PUBLICKEYBYTES
repubkey = pysodium.crypto_scalarmult_curve25519_base(aprikey)
assert repubkey == apubkey
assert 32 == pysodium.crypto_box_SEEDBYTES
boxseed = pysodium.randombytes(pysodium.crypto_box_SEEDBYTES)
assert len(boxseed) == 32
bpubkey, bprikey = pysodium.crypto_box_seed_keypair(boxseed)
assert len(bpubkey) == 32
assert len(bprikey) == 32
repubkey = pysodium.crypto_scalarmult_curve25519_base(bprikey)
assert repubkey == bpubkey
assert 24 == pysodium.crypto_box_NONCEBYTES
nonce = pysodium.randombytes(pysodium.crypto_box_NONCEBYTES)
assert len(nonce) == 24
# nonce = b'\x11\xfbi<\xf2\xb6k\xa05\x0c\xf9\x86t\x07\x8e\xab\x8a\x97nG\xe8\x87,\x94'
atob_tx = "Hi Bob I'm Alice"
atob_txb = atob_tx.encode("utf-8")
# Detached recomputes shared key every time.
# A encrypt to B
acrypt, amac = pysodium.crypto_box_detached(atob_txb, nonce, bpubkey,
aprikey)
amacl = pysodium.crypto_box_MACBYTES
assert amacl == 16
# amac = b'\xa1]\xc6ML\xe2\xa9:\xc0\xdc\xab\xa5\xc4\xc7\xf4\xdb'
# acrypt = (b'D\n\x17\xb6z\xd8+t)\xcc`y\x1d\x10\x0cTC\x02\xb5@\xe2\xf2\xc9-(\xec*O\xb8~\xe2\x1a\xebO')
# when transmitting prepend amac to crypt
acipher = pysodium.crypto_box(atob_txb, nonce, bpubkey, aprikey)
assert acipher == amac + acrypt
atob_rxb = pysodium.crypto_box_open_detached(acrypt, amac, nonce, apubkey,
bprikey)
atob_rx = atob_rxb.decode("utf-8")
assert atob_rx == atob_tx
assert atob_rxb == atob_txb
atob_rxb = pysodium.crypto_box_open(acipher, nonce, apubkey, bprikey)
atob_rx = atob_rxb.decode("utf-8")
assert atob_rx == atob_tx
assert atob_rxb == atob_txb
btoa_tx = "Hello Alice I am Bob"
btoa_txb = btoa_tx.encode("utf-8")
# B encrypt to A
bcrypt, bmac = pysodium.crypto_box_detached(btoa_txb, nonce, apubkey,
bprikey)
# bmac = b'\x90\xe07=\xd22\x8fh2\xff\xdd\x84tC\x053'
# bcrypt = (b'8\xb5\xba\xe7\xcc\xae B\xefx\xe6{U\xf7\xefA\x00\xc7|\xdbu\xcfc\x01$\xa9\xa2P\xa7\x84\xa5\xae\x180')
# when transmitting prepend amac to crypt
bcipher = pysodium.crypto_box(btoa_txb, nonce, apubkey, bprikey)
assert bcipher == bmac + bcrypt
btoa_rxb = pysodium.crypto_box_open_detached(bcrypt, bmac, nonce, bpubkey,
aprikey)
btoa_rx = btoa_rxb.decode("utf-8")
assert btoa_rx == btoa_tx
assert btoa_rxb == btoa_txb
btoa_rxb = pysodium.crypto_box_open(bcipher, nonce, bpubkey, aprikey)
btoa_rx = btoa_rxb.decode("utf-8")
assert btoa_rx == btoa_tx
assert btoa_rxb == btoa_txb
# compute shared key
asymkey = pysodium.crypto_box_beforenm(bpubkey, aprikey)
bsymkey = pysodium.crypto_box_beforenm(apubkey, bprikey)
assert asymkey == bsymkey
acipher = pysodium.crypto_box_afternm(atob_txb, nonce, asymkey)
atob_rxb = pysodium.crypto_box_open_afternm(acipher, nonce, bsymkey)
assert atob_rxb == atob_txb
bcipher = pysodium.crypto_box_afternm(btoa_txb, nonce, bsymkey)
btoa_rxb = pysodium.crypto_box_open_afternm(bcipher, nonce, asymkey)
assert btoa_rxb == btoa_txb
# crypto_box_seal public key encryption with X25519 keys
# uses same X25519 type of keys as crypto_box authenticated encryption
# so when converting sign key Ed25519 to X25519 can use for both types of encryption
pubkey, prikey = pysodium.crypto_box_keypair()
assert len(pubkey) == 32 == pysodium.crypto_box_PUBLICKEYBYTES
assert len(prikey) == 32 == pysodium.crypto_box_SECRETKEYBYTES
assert 48 == pysodium.crypto_box_SEALBYTES
msg_txb = "Catch me if you can.".encode("utf-8")
assert msg_txb == b'Catch me if you can.'
cipher = pysodium.crypto_box_seal(msg_txb, pubkey)
assert len(cipher) == 48 + len(msg_txb)
msg_rxb = pysodium.crypto_box_seal_open(cipher, pubkey, prikey)
assert msg_rxb == msg_txb
# convert Ed25519 key pair to X25519 key pair
# https://blog.filippo.io/using-ed25519-keys-for-encryption/
# https://libsodium.gitbook.io/doc/advanced/ed25519-curve25519
# crypto_sign_ed25519_pk_to_curve25519
# crypto_sign_ed25519_sk_to_curve25519
pubkey = pysodium.crypto_sign_pk_to_box_pk(verkey)
assert len(pubkey) == pysodium.crypto_box_PUBLICKEYBYTES
prikey = pysodium.crypto_sign_sk_to_box_sk(sigkey)
assert len(prikey) == pysodium.crypto_box_SECRETKEYBYTES
repubkey = pysodium.crypto_scalarmult_curve25519_base(prikey)
assert repubkey == pubkey
msg_txb = "Encoded using X25519 key converted from Ed25519 key".encode(
"utf-8")
cipher = pysodium.crypto_box_seal(msg_txb, pubkey)
assert len(cipher) == 48 + len(msg_txb)
msg_rxb = pysodium.crypto_box_seal_open(cipher, pubkey, prikey)
assert msg_rxb == msg_txb
"""
def new(self):
self.sk = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
self.pk = nacl.crypto_scalarmult_curve25519_base(self.sk)
return self
def test_crypto_box_pk_from_sk(self):
pk1, sk = pysodium.crypto_box_keypair()
pk2 = pysodium.crypto_scalarmult_curve25519_base(sk)
self.assertEqual(pk1, pk2)
def __init__(self):
self.secret = None
self.key = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
self.public = nacl.crypto_scalarmult_curve25519_base(self.key)
def __init__(self):
self.secret = None
self.key = nacl.randombytes(nacl.crypto_scalarmult_curve25519_BYTES)
self.public = nacl.crypto_scalarmult_curve25519_base(self.key)