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Code Issues Releases Wiki Activity

chore(crypto,legacy,core): add comments about prefixes

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This commit is contained in:
Ondřej Vejpustek 2024-08-14 16:51:18 +02:00
parent 20f75e001b
commit eef4319cda
6 changed files with 15 additions and 0 deletions
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1
core/src/apps/bitcoin/get_public_key.py
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@ -70,6 +70,7 @@ async def get_public_key(
raise wire.DataError("Invalid combination of coin and script_type")
pubkey = node.public_key()
# For curve25519 and ed25519, the public key has the prefix 0x00, as specified by SLIP-10. However, since this prefix is non-standard, it may be removed in the future.
node_type = HDNodeType(
depth=node.depth(),
child_num=node.child_num(),

2
core/src/apps/misc/get_ecdh_session_key.py
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@ -55,6 +55,7 @@ async def get_ecdh_session_key(msg: GetECDHSessionKey) -> ECDHSessionKey:
if peer_public_key[0] != 0x40:
raise DataError("Curve25519 public key should start with 0x40")
# The prefix 0x04 doesn't make sense here, and may be changed or removed in the future
session_key = b"\x04" + curve25519.multiply(
node.private_key(), peer_public_key[1:]
)
@ -62,4 +63,5 @@ async def get_ecdh_session_key(msg: GetECDHSessionKey) -> ECDHSessionKey:
raise DataError("Unsupported curve for ECDH: " + curve_name)
# END ecdh
# For curve25519, the public key has the prefix 0x00, as specified by SLIP-10. However, since this prefix is non-standard, it may be removed in the future.
return ECDHSessionKey(session_key=session_key, public_key=node.public_key())

1
core/src/apps/misc/sign_identity.py
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@ -61,6 +61,7 @@ async def sign_identity(msg: SignIdentity) -> SignedIdentity:
curve_name,
)
# For ed25519, the public key has the prefix 0x00, as specified by SLIP-10. However, since this prefix is non-standard, it may be removed in the future.
return SignedIdentity(address=address, public_key=pubkey, signature=signature)

2
crypto/bip32.c
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@ -701,6 +701,8 @@ int hdnode_get_shared_key(const HDNode *node, const uint8_t *peer_public_key,
*result_size = 65;
return 0;
} else if (node->curve == &curve25519_info) {
// The prefix 0x04 doesn't make sense here, and may be changed or removed in
// the future
session_key[0] = 0x04;
if (peer_public_key[0] != 0x40) {
return 1; // Curve25519 public key should start with 0x40 byte.

3
legacy/firmware/fsm_msg_coin.h
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@ -75,6 +75,9 @@ void fsm_msgGetPublicKey(const GetPublicKey *msg) {
memcpy(resp->node.chain_code.bytes, node->chain_code, 32);
resp->node.has_private_key = false;
resp->node.public_key.size = 33;
// For curve25519 and ed25519, the public key has the prefix 0x00, as
// specified by SLIP-10. However, since this prefix is non-standard, it may be
// removed in the future.
memcpy(resp->node.public_key.bytes, node->public_key, 33);
if (coin->xpub_magic && (script_type == InputScriptType_SPENDADDRESS ||

6
legacy/firmware/fsm_msg_crypto.h
View File

@ -160,6 +160,9 @@ void fsm_msgSignIdentity(const SignIdentity *msg) {
}
}
resp->public_key.size = 33;
// For ed25519, the public key has the prefix 0x00, as specified by SLIP-10.
// However, since this prefix is non-standard, it may be removed in the
// future.
memcpy(resp->public_key.bytes, node->public_key, 33);
resp->signature.size = 65;
msg_write(MessageType_MessageType_SignedIdentity, resp);
@ -220,6 +223,9 @@ void fsm_msgGetECDHSessionKey(const GetECDHSessionKey *msg) {
layoutHome();
return;
}
// For curve25519, the public key has the prefix 0x00, as specified by
// SLIP-10. However, since this prefix is non-standard, it may be removed in
// the future.
memcpy(resp->public_key.bytes, node->public_key, 33);
resp->public_key.size = 33;
resp->has_public_key = true;