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Code Issues Releases Wiki Activity

embed/crypto: ed25519 keccak signing

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to be discussed whether not to provide a hash func instead of string
This commit is contained in:
Tomas Susanka 2018-03-19 14:37:23 +01:00 committed by Jan Pochyla
parent 8e7ee89b02
commit fb15e993f1
2 changed files with 23 additions and 8 deletions
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27
embed/extmod/modtrezorcrypto/modtrezorcrypto-ed25519.h
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@ -20,6 +20,7 @@
#include "py/objstr.h"
#include "ed25519-donna/ed25519.h"
#include "ed25519-donna/ed25519-keccak.h"
#include "rand.h"
@ -54,14 +55,14 @@ STATIC mp_obj_t mod_trezorcrypto_ed25519_publickey(mp_obj_t secret_key) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorcrypto_ed25519_publickey_obj, mod_trezorcrypto_ed25519_publickey);
/// def sign(secret_key: bytes, message: bytes) -> bytes:
/// def sign(secret_key: bytes, message: bytes, hasher: str='') -> bytes:
/// '''
/// Uses secret key to produce the signature of message.
/// '''
STATIC mp_obj_t mod_trezorcrypto_ed25519_sign(mp_obj_t secret_key, mp_obj_t message) {
STATIC mp_obj_t mod_trezorcrypto_ed25519_sign(size_t n_args, const mp_obj_t *args) {
mp_buffer_info_t sk, msg;
mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
mp_get_buffer_raise(message, &msg, MP_BUFFER_READ);
mp_get_buffer_raise(args[0], &sk, MP_BUFFER_READ);
mp_get_buffer_raise(args[1], &msg, MP_BUFFER_READ);
if (sk.len != 32) {
mp_raise_ValueError("Invalid length of secret key");
}
@ -69,12 +70,26 @@ STATIC mp_obj_t mod_trezorcrypto_ed25519_sign(mp_obj_t secret_key, mp_obj_t mess
mp_raise_ValueError("Empty data to sign");
}
ed25519_public_key pk;
ed25519_publickey(*(const ed25519_secret_key *)sk.buf, pk);
uint8_t out[64];
mp_buffer_info_t hash_func;
if (n_args == 3) {
mp_get_buffer_raise(args[2], &hash_func, MP_BUFFER_READ);
// if hash_func == 'keccak':
if (memcmp(hash_func.buf, "keccak", sizeof("keccak")) == 0) {
ed25519_publickey_keccak(*(const ed25519_secret_key *)sk.buf, pk);
ed25519_sign_keccak(msg.buf, msg.len, *(const ed25519_secret_key *)sk.buf, pk, *(ed25519_signature *)out);
} else {
mp_raise_ValueError("Unknown hash function");
}
} else {
ed25519_publickey(*(const ed25519_secret_key *)sk.buf, pk);
ed25519_sign(msg.buf, msg.len, *(const ed25519_secret_key *)sk.buf, pk, *(ed25519_signature *)out);
}
return mp_obj_new_bytes(out, sizeof(out));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_trezorcrypto_ed25519_sign_obj, mod_trezorcrypto_ed25519_sign);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorcrypto_ed25519_sign_obj, 2, 3, mod_trezorcrypto_ed25519_sign);
/// def verify(public_key: bytes, signature: bytes, message: bytes) -> bool:
/// '''

2
mocks/generated/trezorcrypto.py
View File

@ -284,7 +284,7 @@ def publickey(secret_key: bytes) -> bytes:
'''
# extmod/modtrezorcrypto/modtrezorcrypto-ed25519.h
def sign(secret_key: bytes, message: bytes) -> bytes:
def sign(secret_key: bytes, message: bytes, hasher: str='') -> bytes:
'''
Uses secret key to produce the signature of message.
'''