pk_wrap: fix comment in ecdsa_verify_wrap
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/pk_wrap.c b/library/pk_wrap.c
index 2a71bd8..7f266d2 100644
--- a/library/pk_wrap.c
+++ b/library/pk_wrap.c
@@ -689,9 +689,11 @@
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
size_t key_len;
- /* This buffer contains first the public key (consisting of two public
- * points plus a header byte), then the signature (consisting of two
- * public points). Size it for the public key which is one byte larger. */
+ /* This buffer will initially contain the public key and then the signature
+ * but at different points in time. For all curves except secp224k1, which
+ * is not currently supported in PSA, the public key is one byte longer
+ * (header byte + 2 numbers, while the signature is only 2 numbers),
+ * so use that as the buffer size. */
unsigned char buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
unsigned char *p;
psa_algorithm_t psa_sig_md = PSA_ALG_ECDSA_ANY;