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bignum_common.py: Added bits_to_limbs method.

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This patch introduces a rounding-error-resiliant method to
calculate bits_to_limbs, and is updating `SECP224R1` and
`SECP224K1` to use it.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis
2023-06-27 16:34:59 +01:00
parent 23394b17bc
commit 80c4ae893c
2 changed files with 12 additions and 4 deletions
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6
scripts/mbedtls_dev/ecp.py
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@ -165,7 +165,8 @@ class EcpP224R1Raw(bignum_common.ModOperationCommon,
@property
def arg_a(self) -> str:
hex_digits = bignum_common.hex_digits_for_limb(448 // self.bits_in_limb, self.bits_in_limb)
limbs = 2 * bignum_common.bits_to_limbs(224, self.bits_in_limb)
hex_digits = bignum_common.hex_digits_for_limb(limbs, self.bits_in_limb)
return super().format_arg('{:x}'.format(self.int_a)).zfill(hex_digits)
def result(self) -> List[str]:
@ -624,7 +625,8 @@ class EcpP224K1Raw(bignum_common.ModOperationCommon,
@property
def arg_a(self) -> str:
hex_digits = bignum_common.hex_digits_for_limb(448 // self.bits_in_limb, self.bits_in_limb)
limbs = 2 * bignum_common.bits_to_limbs(224, self.bits_in_limb)
hex_digits = bignum_common.hex_digits_for_limb(limbs, self.bits_in_limb)
return super().format_arg('{:x}'.format(self.int_a)).zfill(hex_digits)
def result(self) -> List[str]: