diff --git a/contracts/contracts/Sapphire.sol b/contracts/contracts/Sapphire.sol
index 1fd02b5d..5ee4aed9 100644
--- a/contracts/contracts/Sapphire.sol
+++ b/contracts/contracts/Sapphire.sol
@@ -29,6 +29,8 @@ library Sapphire {
         0x0100000000000000000000000000000000000101;
     address internal constant SHA512 =
         0x0100000000000000000000000000000000000102;
+    address internal constant SHA384 =
+        0x0100000000000000000000000000000000000103;
 
     type Curve25519PublicKey is bytes32;
     type Curve25519SecretKey is bytes32;
@@ -52,7 +54,9 @@ library Sapphire {
         // Sr25519 signature over the provided message.
         Sr25519,
         // Secp256r1 signature over the provided SHA-256 digest.
-        Secp256r1PrehashedSha256
+        Secp256r1PrehashedSha256,
+        // Secp384r1 signature over the provided SHA-384 digest.
+        Secp384r1PrehashedSha384
     }
 
     /**
@@ -231,7 +235,7 @@ library Sapphire {
  * **not** vulnerable to length-extension attacks.
  *
  * @custom:standard https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf
- * @custom:see @oasisprotocol/oasis-sdk :: precompile/sha512.rs :: call_sha512_256
+ * @custom:see @oasisprotocol/oasis-sdk :: precompile/sha2.rs :: call_sha512_256
  * @param input Bytes to hash
  * @return result 32 byte digest
  */
@@ -247,7 +251,7 @@ function sha512_256(bytes memory input) view returns (bytes32 result) {
  * Hash the input data with SHA-512
  *
  * @custom:standard https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf
- * @custom:see @oasisprotocol/oasis-sdk :: precompile/sha512.rs :: call_sha512
+ * @custom:see @oasisprotocol/oasis-sdk :: precompile/sha2.rs :: call_sha512
  * @param input Bytes to hash
  * @return output 64 byte digest
  */
@@ -258,3 +262,19 @@ function sha512(bytes memory input) view returns (bytes memory output) {
 
     require(success, "sha512");
 }
+
+/**
+ * Hash the input data with SHA-384
+ *
+ * @custom:standard https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf
+ * @custom:see @oasisprotocol/oasis-sdk :: precompile/sha2.rs :: call_sha384
+ * @param input Bytes to hash
+ * @return output 48 byte digest
+ */
+function sha384(bytes memory input) view returns (bytes memory output) {
+    bool success;
+
+    (success, output) = Sapphire.SHA384.staticcall(input);
+
+    require(success, "sha384");
+}
diff --git a/contracts/contracts/tests/HashTests.sol b/contracts/contracts/tests/HashTests.sol
index 1145826a..a20e8e01 100644
--- a/contracts/contracts/tests/HashTests.sol
+++ b/contracts/contracts/tests/HashTests.sol
@@ -2,7 +2,7 @@
 
 pragma solidity ^0.8.0;
 
-import {sha512, sha512_256} from "../Sapphire.sol";
+import {sha512, sha512_256, sha384} from "../Sapphire.sol";
 
 contract HashTests {
     function testSHA512(bytes memory data)
@@ -13,6 +13,14 @@ contract HashTests {
         return sha512(data);
     }
 
+    function testSHA384(bytes memory data)
+        external
+        view
+        returns (bytes memory)
+    {
+        return sha384(data);
+    }
+
     function testSHA512_256(bytes memory data) external view returns (bytes32) {
         return sha512_256(data);
     }
diff --git a/contracts/test/hashes.ts b/contracts/test/hashes.ts
index 29e8fe2f..b4d524eb 100644
--- a/contracts/test/hashes.ts
+++ b/contracts/test/hashes.ts
@@ -3,6 +3,13 @@ import { randomBytes, createHash } from 'crypto';
 import { ethers } from 'hardhat';
 import { HashTests } from '../typechain-types/contracts/tests/HashTests';
 import { HashTests__factory } from '../typechain-types/factories/contracts/tests';
+import { PromiseOrValue } from '../typechain-types/common';
+import { BytesLike, CallOverrides } from 'ethers';
+
+type HasherTestT = (
+  data: PromiseOrValue<BytesLike>,
+  overrides?: CallOverrides | undefined,
+) => Promise<string>;
 
 describe('Hashes', () => {
   let contract: HashTests;
@@ -15,21 +22,24 @@ describe('Hashes', () => {
     await contract.deployed();
   });
 
-  it('SHA512/256', async () => {
+  async function testHashes(algname: string, method: HasherTestT) {
     for (let i = 0; i < 512; i += 64) {
       const data = randomBytes(i);
-      const hash = createHash('SHA512-256').update(data).digest('hex');
-      const result = await contract.testSHA512_256(data);
+      const hash = createHash(algname).update(data).digest('hex');
+      const result = await method(data);
       expect(result).eq('0x' + hash);
     }
+  }
+
+  it('SHA512-256', async () => {
+    testHashes('SHA512-256', contract.testSHA512_256.bind(contract));
   });
 
   it('SHA512', async () => {
-    for (let i = 0; i < 512; i += 64) {
-      const data = randomBytes(i);
-      const hash = createHash('SHA512').update(data).digest('hex');
-      const result = await contract.testSHA512(data);
-      expect(result).eq('0x' + hash);
-    }
+    testHashes('SHA512', contract.testSHA512.bind(contract));
+  });
+
+  it('SHA384', async () => {
+    testHashes('SHA384', contract.testSHA384.bind(contract));
   });
 });
diff --git a/contracts/test/signing.ts b/contracts/test/signing.ts
index 59658c0a..be2474bf 100644
--- a/contracts/test/signing.ts
+++ b/contracts/test/signing.ts
@@ -90,6 +90,7 @@ const VARYING_SIZED_BUFFERS = [
   randomBytes(1),
   randomBytes(16),
   randomBytes(32),
+  randomBytes(48),
   randomBytes(64),
 ];
 
@@ -213,4 +214,19 @@ describe('Signing', function () {
       0,
     );
   });
+
+  it('Secp384r1 (Prehashed SHA384)', async () => {
+    // Try Secp384r1 (alg=8)
+    // 48 byte context, empty message
+    const sha384_kp = await se.testKeygen(8, randomBytes(48));
+    await testSignThenVerify(
+      se,
+      8,
+      sha384_kp,
+      randomBytes(48),
+      EMPTY_BUFFER,
+      48,
+      0,
+    );
+  });
 });