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Move some bignum functions to internal header

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We will need a couple of low level functions to implement safe
unblinding in RSA.

Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath
2024-01-08 14:08:17 +00:00
parent 404160a533
commit f9cc4763f1
2 changed files with 63 additions and 44 deletions
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40
library/bignum_internal.h
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@@ -28,4 +28,44 @@
int mbedtls_mpi_get_mont_r2_unsafe(mbedtls_mpi *X,
const mbedtls_mpi *N);
/**
* \brief Calculate initialisation value for fast Montgomery modular
* multiplication.
*
* \param[out] mm The initialisation value for fast Montgomery modular
* multiplication.
* \param[in] N Little-endian presentation of the modulus. This must have
* at least one limb.
*/
void mbedtls_mpi_montg_init(mbedtls_mpi_uint *mm, const mbedtls_mpi *N);
/** Montgomery multiplication: A = A * B * R^-1 mod N (HAC 14.36)
*
* \param[in,out] A One of the numbers to multiply.
* It must have at least as many limbs as N
* (A->n >= N->n), and any limbs beyond n are ignored.
* On successful completion, A contains the result of
* the multiplication A * B * R^-1 mod N where
* R = (2^ciL)^n.
* \param[in] B One of the numbers to multiply.
* It must be nonzero and must not have more limbs than N
* (B->n <= N->n).
* \param[in] N The modulo. N must be odd.
* \param mm The value calculated by
* `mbedtls_mpi_montg_init(&mm, N)`.
* This is -N^-1 mod 2^ciL.
* \param[in,out] T A bignum for temporary storage.
* It must be at least twice the limb size of N plus 2
* (T->n >= 2 * (N->n + 1)).
* Its initial content is unused and
* its final content is indeterminate.
* Note that unlike the usual convention in the library
* for `const mbedtls_mpi*`, the content of T can change.
*/
void mbedtls_mpi_montmul(mbedtls_mpi *A,
const mbedtls_mpi *B,
const mbedtls_mpi *N,
mbedtls_mpi_uint mm,
const mbedtls_mpi *T);
#endif /* MBEDTLS_BIGNUM_INTERNAL_H */