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Restrict input parameter size for ecp_mod_p521_raw

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The imput mpi parameter must have twice as many limbs as the modulus.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei 2023-02-15 16:52:33 +01:00
parent d10d429380
commit cf228706cd
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GPG key ID: FEE76C0CF8C6267D
3 changed files with 33 additions and 46 deletions
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7
scripts/mbedtls_dev/ecp.py
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@ -81,7 +81,7 @@ class EcpP521R1Raw(bignum_common.ModOperationCommon,
"""Test cases for ecp quasi_reduction()."""
test_function = "ecp_mod_p521_raw"
test_name = "ecp_mod_p521_raw"
input_style = "arch_split"
input_style = "fixed"
arity = 1
moduli = [("01ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
@ -156,9 +156,8 @@ class EcpP521R1Raw(bignum_common.ModOperationCommon,
@property
def arg_a(self) -> str:
# Number of limbs: 2 * N - 1
hex_digits = bignum_common.hex_digits_for_limb(2 * self.limbs - 1, self.bits_in_limb)
return super().format_arg('{:x}'.format(self.int_a)).zfill(hex_digits)
# Number of limbs: 2 * N
return super().format_arg('{:x}'.format(self.int_a)).zfill(2 * self.hex_digits)
def result(self) -> List[str]:
result = self.int_a % self.int_n