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Require input to mbedtls_mpi_core_exp_mod() to already be in Montgomery form

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove 2022-12-06 10:46:30 +00:00
parent c3902ac661
commit ecda186893
3 changed files with 19 additions and 9 deletions
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15
scripts/mbedtls_dev/bignum_core.py
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@ -759,12 +759,23 @@ class BignumCoreExpMod(BignumCoreTarget, bignum_common.ModOperationCommon):
"""Test cases for bignum core exponentiation."""
symbol = "^"
test_function = "mpi_core_exp_mod"
test_name = "Core modular exponentiation"
test_name = "Core modular exponentiation (Mongtomery form only)"
input_style = "fixed"
def arguments(self) -> List[str]:
# Input 'a' has to be given in Montgomery form
mont_a = (self.int_a * self.r) % self.int_n
arg_mont_a = self.format_arg('{:x}'.format(mont_a))
return [bignum_common.quote_str(n) for n in [self.arg_n,
arg_mont_a,
self.arg_b]
] + self.result()
def result(self) -> List[str]:
# Result has to be given in Montgomery form
result = pow(self.int_a, self.int_b, self.int_n)
return [self.format_result(result)]
mont_result = (result * self.r) % self.int_n
return [self.format_result(mont_result)]
@property
def is_valid(self) -> bool: