Spdm 1.3 change salt 0 for psk exchange to 0xff.

salt 0 for psk_exchange ssession should be a 0xff filed array of hash length
  since spdm 1.3.

Author: IntelCaisui

test/spdm-emu/src/secret_impl_sample.rs

@@ -208,6 +208,7 @@ fn generate_measurement_summary_hash_impl(
 
 const MAX_BIN_CONCAT_BUF_SIZE: usize = 2 + 8 + 12 + SPDM_MAX_HASH_SIZE;
 const SALT_0: [u8; SPDM_MAX_HASH_SIZE] = [0u8; SPDM_MAX_HASH_SIZE];
+const SALT_0_FF: [u8; SPDM_MAX_HASH_SIZE] = [0xFF; SPDM_MAX_HASH_SIZE];
 const ZERO_FILLED: [u8; SPDM_MAX_HASH_SIZE] = [0u8; SPDM_MAX_HASH_SIZE];
 const BIN_STR0_LABEL: &[u8] = b"derived";
 
@@ -217,6 +218,12 @@ fn handshake_secret_hkdf_expand_impl(
     psk_hint: &SpdmPskHintStruct,
     info: &[u8],
 ) -> Option<SpdmHkdfOutputKeyingMaterial> {
+    let salt0 = if spdm_version >= SpdmVersion::SpdmVersion13 {
+        &SALT_0_FF[0..base_hash_algo.get_size() as usize]
+    } else {
+        &SALT_0[0..base_hash_algo.get_size() as usize]
+    };
+
     let mut psk_key: SpdmDheFinalKeyStruct = SpdmDheFinalKeyStruct {
         data_size: b"TestPskData\0".len() as u16,
         data: Box::new([0; SPDM_MAX_DHE_KEY_SIZE]),
@@ -225,7 +232,7 @@ fn handshake_secret_hkdf_expand_impl(
 
     let hs_sec = crypto::hkdf::hkdf_extract(
         base_hash_algo,
-        &SALT_0[0..base_hash_algo.get_size() as usize],
+        salt0,
         &SpdmHkdfInputKeyingMaterial::SpdmDheFinalKey(&psk_key),
     )?;
     crypto::hkdf::hkdf_expand(base_hash_algo, &hs_sec, info, base_hash_algo.get_size())
@@ -237,6 +244,12 @@ fn master_secret_hkdf_expand_impl(
     psk_hint: &SpdmPskHintStruct,
     info: &[u8],
 ) -> Option<SpdmHkdfOutputKeyingMaterial> {
+    let salt0 = if spdm_version >= SpdmVersion::SpdmVersion13 {
+        &SALT_0_FF[0..base_hash_algo.get_size() as usize]
+    } else {
+        &SALT_0[0..base_hash_algo.get_size() as usize]
+    };
+
     let mut psk_key: SpdmDheFinalKeyStruct = SpdmDheFinalKeyStruct {
         data_size: b"TestPskData\0".len() as u16,
         data: Box::new([0; SPDM_MAX_DHE_KEY_SIZE]),
@@ -255,7 +268,7 @@ fn master_secret_hkdf_expand_impl(
 
     let hs_sec = crypto::hkdf::hkdf_extract(
         base_hash_algo,
-        &SALT_0[0..base_hash_algo.get_size() as usize],
+        salt0,
         &SpdmHkdfInputKeyingMaterial::SpdmDheFinalKey(&psk_key),
     )?;
     let salt_1 =