Add an EC J-PAKE KDF to transform K -> SHA256(K.X) for TLS 1.2
TLS uses it to derive the session secret. The algorithm takes a serialized
point in an uncompressed form, extracts the X coordinate and computes
SHA256 of it. It is only expected to work with P-256.
Fixes #5978.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index 1024d6b..231ea62 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -239,6 +239,15 @@
*/
#define PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE 128
+/* The expected size of input passed to psa_tls12_ecjpake_to_pms_input,
+ * which is expected to work with P-256 curve only. */
+#define PSA_TLS12_ECJPAKE_TO_PMS_INPUT_SIZE 65
+
+/* The size of a serialized K.X coordinate to be used in
+ * psa_tls12_ecjpake_to_pms_input. This function only accepts the P-256
+ * curve. */
+#define PSA_TLS12_ECJPAKE_TO_PMS_DATA_SIZE 32
+
/** The maximum size of a block cipher. */
#define PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE 16