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mbedtls_psa_ffdh_export_public_key: allow bigger output buffer

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Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
This commit is contained in:
Przemek Stekiel 2023-06-02 15:26:20 +02:00
parent da4fba64b8
commit a4700fa69d
1 changed files with 5 additions and 3 deletions
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8
library/psa_crypto_ffdh.c
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@ -150,7 +150,9 @@ psa_status_t mbedtls_psa_ffdh_export_public_key(
mbedtls_mpi_init(&GX); mbedtls_mpi_init(&G); mbedtls_mpi_init(&GX); mbedtls_mpi_init(&G);
mbedtls_mpi_init(&X); mbedtls_mpi_init(&P); mbedtls_mpi_init(&X); mbedtls_mpi_init(&P);
status = mbedtls_psa_ffdh_set_prime_generator(data_size, &P, &G); size_t key_len = PSA_BITS_TO_BYTES(attributes->core.bits);
status = mbedtls_psa_ffdh_set_prime_generator(key_len, &P, &G);
if (status != PSA_SUCCESS) { if (status != PSA_SUCCESS) {
goto cleanup; goto cleanup;
@ -160,9 +162,9 @@ psa_status_t mbedtls_psa_ffdh_export_public_key(
key_buffer_size)); key_buffer_size));
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&GX, &G, &X, &P, NULL)); MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&GX, &G, &X, &P, NULL));
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&GX, data, data_size)); MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&GX, data, key_len));
*data_length = data_size; *data_length = key_len;
ret = 0; ret = 0;
cleanup: cleanup: