diff options
Diffstat (limited to 'frozen_deps/Cryptodome/Math/_IntegerNative.py')
| -rw-r--r-- | frozen_deps/Cryptodome/Math/_IntegerNative.py | 66 |
1 files changed, 34 insertions, 32 deletions
diff --git a/frozen_deps/Cryptodome/Math/_IntegerNative.py b/frozen_deps/Cryptodome/Math/_IntegerNative.py index 896107f..5f768e2 100644 --- a/frozen_deps/Cryptodome/Math/_IntegerNative.py +++ b/frozen_deps/Cryptodome/Math/_IntegerNative.py @@ -30,7 +30,7 @@ from ._IntegerBase import IntegerBase -from Cryptodome.Util.number import long_to_bytes, bytes_to_long +from Cryptodome.Util.number import long_to_bytes, bytes_to_long, inverse, GCD class IntegerNative(IntegerBase): @@ -62,16 +62,31 @@ class IntegerNative(IntegerBase): def __index__(self): return int(self._value) - def to_bytes(self, block_size=0): + def to_bytes(self, block_size=0, byteorder='big'): if self._value < 0: raise ValueError("Conversion only valid for non-negative numbers") result = long_to_bytes(self._value, block_size) if len(result) > block_size > 0: raise ValueError("Value too large to encode") + if byteorder == 'big': + pass + elif byteorder == 'little': + result = bytearray(result) + result.reverse() + result = bytes(result) + else: + raise ValueError("Incorrect byteorder") return result @classmethod - def from_bytes(cls, byte_string): + def from_bytes(cls, byte_string, byteorder='big'): + if byteorder == 'big': + pass + elif byteorder == 'little': + byte_string = bytearray(byte_string) + byte_string.reverse() + else: + raise ValueError("Incorrect byteorder") return cls(bytes_to_long(byte_string)) # Relations @@ -265,13 +280,7 @@ class IntegerNative(IntegerBase): if self._value == 0: return 1 - bit_size = 0 - tmp = self._value - while tmp: - tmp >>= 1 - bit_size += 1 - - return bit_size + return self._value.bit_length() def size_in_bytes(self): return (self.size_in_bits() - 1) // 8 + 1 @@ -303,22 +312,7 @@ class IntegerNative(IntegerBase): self._value = int(source) def inplace_inverse(self, modulus): - modulus = int(modulus) - if modulus == 0: - raise ZeroDivisionError("Modulus cannot be zero") - if modulus < 0: - raise ValueError("Modulus cannot be negative") - r_p, r_n = self._value, modulus - s_p, s_n = 1, 0 - while r_n > 0: - q = r_p // r_n - r_p, r_n = r_n, r_p - q * r_n - s_p, s_n = s_n, s_p - q * s_n - if r_p != 1: - raise ValueError("No inverse value can be computed" + str(r_p)) - while s_p < 0: - s_p += modulus - self._value = s_p + self._value = inverse(self._value, int(modulus)) return self def inverse(self, modulus): @@ -327,11 +321,7 @@ class IntegerNative(IntegerBase): return result def gcd(self, term): - r_p, r_n = abs(self._value), abs(int(term)) - while r_n > 0: - q = r_p // r_n - r_p, r_n = r_n, r_p - q * r_n - return self.__class__(r_p) + return self.__class__(GCD(abs(self._value), abs(int(term)))) def lcm(self, term): term = int(term) @@ -348,7 +338,7 @@ class IntegerNative(IntegerBase): raise ValueError("n must be a positive integer") if (n & 1) == 0: - raise ValueError("n must be even for the Jacobi symbol") + raise ValueError("n must be odd for the Jacobi symbol") # Step 1 a = a % n @@ -378,3 +368,15 @@ class IntegerNative(IntegerBase): n1 = n % a1 # Step 8 return s * IntegerNative.jacobi_symbol(n1, a1) + + @staticmethod + def _mult_modulo_bytes(term1, term2, modulus): + if modulus < 0: + raise ValueError("Modulus must be positive") + if modulus == 0: + raise ZeroDivisionError("Modulus cannot be zero") + if (modulus & 1) == 0: + raise ValueError("Odd modulus is required") + + number_len = len(long_to_bytes(modulus)) + return long_to_bytes((term1 * term2) % modulus, number_len) |