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psa_util: improve convert_raw_to_der_single_int()

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Allow the function to support DER buffers than what it is nominally
required by the provided coordinates. In other words let's ignore
padding zeros in the raw number.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti
2024-02-05 12:06:46 +01:00
parent 315e4afc0a
commit 954ef4bbd5
4 changed files with 33 additions and 16 deletions
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4
tests/suites/test_suite_psa_crypto_util.data
View File

@@ -115,3 +115,7 @@ ecdsa_raw_to_der_incremental:512:"9111111111111111111111111111111111111111111111
ECDSA Raw -> DER, 521bit, Incremental DER buffer sizes
depends_on:PSA_WANT_ECC_SECP_R1_521
ecdsa_raw_to_der_incremental:528:"911111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222":"3081890243009111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111110242222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222"
ECDSA Raw -> DER, 256bit, DER buffer of minimal length (1 byte per integer)
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_raw_to_der_incremental:256:"00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002":"3006020101020102"

13
tests/suites/test_suite_psa_crypto_util.function
View File

@@ -32,6 +32,7 @@ void ecdsa_raw_to_der_incremental(int key_bits, data_t *input, data_t *exp_resul
size_t ret_len;
size_t i;
/* Test with an output buffer smaller than required (expexted to fail). */
for (i = 1; i < tmp_buf_len; i++) {
TEST_CALLOC(tmp_buf, i);
TEST_ASSERT(mbedtls_ecdsa_raw_to_der(key_bits, input->x, input->len,
@@ -39,10 +40,16 @@ void ecdsa_raw_to_der_incremental(int key_bits, data_t *input, data_t *exp_resul
mbedtls_free(tmp_buf);
tmp_buf = NULL;
}
/* Test with an output buffer larger/equal than required (expexted to
* succeed). */
for (i = tmp_buf_len; i < (2 * tmp_buf_len); i++) {
TEST_CALLOC(tmp_buf, i);
TEST_ASSERT(mbedtls_ecdsa_raw_to_der(key_bits, input->x, input->len,
tmp_buf, i, &ret_len) == 0);
mbedtls_free(tmp_buf);
tmp_buf = NULL;
}
TEST_CALLOC(tmp_buf, i);
TEST_EQUAL(mbedtls_ecdsa_raw_to_der(key_bits, input->x, input->len,
tmp_buf, i, &ret_len), 0);
exit:
mbedtls_free(tmp_buf);
}