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dhm: remove unused variable (and improve comment)

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard
2025-08-26 11:31:52 +02:00
parent 9e1c532847
commit 6ab0f519b8
1 changed files with 1 additions and 6 deletions
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7
library/dhm.c
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@@ -345,9 +345,6 @@ static int dhm_update_blinding(mbedtls_dhm_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{ {
int ret; int ret;
mbedtls_mpi R;
mbedtls_mpi_init(&R);
/* /*
* Don't use any blinding the first time a particular X is used, * Don't use any blinding the first time a particular X is used,
@@ -382,13 +379,11 @@ static int dhm_update_blinding(mbedtls_dhm_context *ctx,
/* Vi = random( 2, P-2 ) */ /* Vi = random( 2, P-2 ) */
MBEDTLS_MPI_CHK(dhm_random_below(&ctx->Vi, &ctx->P, f_rng, p_rng)); MBEDTLS_MPI_CHK(dhm_random_below(&ctx->Vi, &ctx->P, f_rng, p_rng));
/* Vf = Vi^-X mod P */ /* Vf = Vi^-X = (Vi^-1)^X mod P */
MBEDTLS_MPI_CHK(mbedtls_mpi_gcd_modinv_odd(NULL, &ctx->Vf, &ctx->Vi, &ctx->P)); MBEDTLS_MPI_CHK(mbedtls_mpi_gcd_modinv_odd(NULL, &ctx->Vf, &ctx->Vi, &ctx->P));
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP)); MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP));
cleanup: cleanup:
mbedtls_mpi_free(&R);
return ret; return ret;
} }