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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>
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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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library/bignum_core.h
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@@ -500,11 +500,12 @@ int mbedtls_mpi_core_fill_random( mbedtls_mpi_uint *X, size_t X_limbs,
/**
* \brief Perform a modular exponentiation with secret exponent:
* X = A^E mod N
* X = A^E mod N, where \p A is already in Montgomery form.
*
* \param[out] X The destination MPI, as a little endian array of length
* \p AN_limbs.
* \param[in] A The base MPI, as a little endian array of length \p AN_limbs.
* Must be in Montgomery form.
* \param[in] N The modulus, as a little endian array of length \p AN_limbs.
* \param AN_limbs The number of limbs in \p X, \p A, \p N, \p RR.
* \param[in] E The exponent, as a little endian array of length \p E_limbs.