feat: generate credential ID on chain

pallets/public-credentials/src/mock.rs

@@ -16,9 +16,13 @@
 
 // If you feel like getting in touch with us, you can do so at [email protected]
 
+use codec::Encode;
+use sp_runtime::traits::Hash;
+
 use ctype::CtypeHashOf;
+use attestation::AttesterOf;
 
-use crate::{Claim, Config, InputClaimsContentOf, InputCredentialOf, InputSubjectIdOf};
+use crate::{Claim, Config, CredentialIdOf, InputClaimsContentOf, InputCredentialOf, InputSubjectIdOf};
 
 // Generate a public credential using a many Default::default() as possible.
 pub fn generate_base_public_credential_creation_op<T: Config>(
@@ -36,6 +40,13 @@ pub fn generate_base_public_credential_creation_op<T: Config>(
 	}
 }
 
+pub fn generate_credential_id<T: Config>(
+	input_credential: &InputCredentialOf<T>,
+	attester: &AttesterOf<T>
+) -> CredentialIdOf<T> {
+	T::CredentialHash::hash(&[&input_credential.encode()[..], &attester.encode()[..]].concat()[..])
+}
+
 #[cfg(test)]
 pub use crate::mock::runtime::*;
 
@@ -271,13 +282,6 @@ pub(crate) mod runtime {
 
 	pub(crate) const SUBJECT_ID_00: TestSubjectId = TestSubjectId([100u8; 32]);
 
-	pub(crate) const CLAIM_HASH_SEED_01: u64 = 1u64;
-	pub(crate) const CLAIM_HASH_SEED_02: u64 = 2u64;
-
-	pub(crate) fn claim_hash_from_seed(seed: u64) -> Hash {
-		Hash::from_low_u64_be(seed)
-	}
-
 	pub(crate) fn sr25519_did_from_seed(seed: &[u8; 32]) -> SubjectId {
 		MultiSigner::from(sr25519::Pair::from_seed(seed).public())
 			.into_account()