wallets: remove @stellar/stellar-sdk dependency

.changeset/remove-stellar-sdk.md

@@ -0,0 +1,5 @@
+---
+"@crossmint/wallets-sdk": patch
+---
+
+Remove @stellar/stellar-sdk dependency by replacing it with tweetnacl (already a dependency) for ed25519 operations and a local Stellar StrKey encoder ported from open-signer.

packages/wallets/package.json

@@ -29,7 +29,6 @@
         "@crossmint/common-sdk-base": "workspace:*",
         "@hey-api/client-fetch": "0.8.1",
         "@solana/web3.js": "1.98.1",
-        "@stellar/stellar-sdk": "v14.0.0-rc.3",
         "abitype": "1.0.8",
         "bs58": "5.0.0",
         "@noble/hashes": "1.8.0",

packages/wallets/src/signers/server/helpers/derive-server-signer.ts

@@ -1,11 +1,11 @@
 import { privateKeyToAccount } from "viem/accounts";
 import { bytesToHex } from "@noble/hashes/utils";
 import { Keypair as SolanaKeypair } from "@solana/web3.js";
-import { Keypair as StellarKeypair } from "@stellar/stellar-sdk";
 
 import type { Chain } from "../../../chains/chains";
 import type { ServerSignerConfig } from "../../types";
 import { deriveKeyBytes } from "../../../utils/server-key-derivation";
+import { ed25519KeypairFromSeed, encodeStellarPublicKey } from "../../../utils/stellar";
 import { getChainType } from "./get-chain-type";
 
 export function deriveServerSignerAddress(keyBytes: Uint8Array, chain: Chain): string {
@@ -16,7 +16,7 @@ export function deriveServerSignerAddress(keyBytes: Uint8Array, chain: Chain): s
         case "solana":
             return SolanaKeypair.fromSeed(keyBytes).publicKey.toBase58();
         case "stellar":
-            return StellarKeypair.fromRawEd25519Seed(Buffer.from(keyBytes)).publicKey();
+            return encodeStellarPublicKey(ed25519KeypairFromSeed(keyBytes).publicKey);
     }
 }
 

packages/wallets/src/signers/server/stellar-server-signer.ts

@@ -1,16 +1,17 @@
-import { Keypair } from "@stellar/stellar-sdk";
 import type { Signer, ServerInternalSignerConfig } from "../types";
+import { ed25519KeypairFromSeed, ed25519Sign, encodeStellarPublicKey } from "../../utils/stellar";
 
 export class StellarServerSigner implements Signer<"server"> {
     type = "server" as const;
     private _address: string;
     private _locator: string;
-    private keypair: Keypair;
+    private secretKey: Uint8Array;
 
     constructor(config: ServerInternalSignerConfig) {
-        this.keypair = Keypair.fromRawEd25519Seed(Buffer.from(config.derivedKeyBytes));
-        this._address = this.keypair.publicKey();
+        const keypair = ed25519KeypairFromSeed(config.derivedKeyBytes);
+        this._address = encodeStellarPublicKey(keypair.publicKey);
         this._locator = config.locator;
+        this.secretKey = keypair.secretKey;
     }
 
     address() {
@@ -26,8 +27,8 @@ export class StellarServerSigner implements Signer<"server"> {
             throw new Error("StellarServerSigner.signMessage: expected a base64-encoded string");
         }
         const messageBytes = Buffer.from(message, "base64");
-        const signatureBytes = this.keypair.sign(messageBytes);
-        return { signature: signatureBytes.toString("base64") };
+        const signatureBytes = ed25519Sign(messageBytes, this.secretKey);
+        return { signature: Buffer.from(signatureBytes).toString("base64") };
     }
 
     async signTransaction(transaction: string) {

packages/wallets/src/utils/stellar.ts

@@ -0,0 +1,104 @@
+import nacl from "tweetnacl";
+
+/**
+ * Stellar StrKey encoding for ed25519 public keys.
+ * Ported from open-signer's shared/cryptography/src/primitives/encoding/strkey.ts
+ * to remove the @stellar/stellar-sdk dependency.
+ */
+
+const ED25519_PUBLIC_KEY_VERSION_BYTE = 6 << 3; // "G" prefix when base32-encoded
+
+const BASE32_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+
+// CRC16-XModem lookup table (from Stellar's implementation)
+// prettier-ignore
+const CRC16_TABLE = [
+    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad,
+    0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a,
+    0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b,
+    0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
+    0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861,
+    0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96,
+    0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87,
+    0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
+    0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
+    0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3,
+    0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290,
+    0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
+    0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e,
+    0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f,
+    0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c,
+    0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
+    0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83,
+    0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
+    0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
+];
+
+function crc16Xmodem(data: Uint8Array): Uint8Array {
+    let crc = 0x0;
+    for (let i = 0; i < data.length; i++) {
+        const byte = data[i]!;
+        crc = ((crc << 8) ^ CRC16_TABLE[((crc >> 8) ^ byte)!]!) & 0xffff;
+    }
+    const checksum = new Uint8Array(2);
+    checksum[0] = crc & 0xff;
+    checksum[1] = (crc >> 8) & 0xff;
+    return checksum;
+}
+
+function base32Encode(data: Uint8Array): string {
+    let bits = 0;
+    let value = 0;
+    let output = "";
+
+    for (let i = 0; i < data.length; i++) {
+        value = (value << 8) | data[i]!;
+        bits += 8;
+        while (bits >= 5) {
+            output += BASE32_ALPHABET[(value >>> (bits - 5)) & 31];
+            bits -= 5;
+        }
+    }
+    if (bits > 0) {
+        output += BASE32_ALPHABET[(value << (5 - bits)) & 31];
+    }
+    while (output.length % 8 !== 0) {
+        output += "=";
+    }
+    return output;
+}
+
+/**
+ * Encode a 32-byte ed25519 public key as a Stellar StrKey address (G... format).
+ */
+export function encodeStellarPublicKey(publicKeyBytes: Uint8Array): string {
+    const payload = new Uint8Array(1 + publicKeyBytes.length);
+    payload[0] = ED25519_PUBLIC_KEY_VERSION_BYTE;
+    payload.set(publicKeyBytes, 1);
+
+    const checksum = crc16Xmodem(payload);
+    const unencoded = new Uint8Array(payload.length + 2);
+    unencoded.set(payload, 0);
+    unencoded.set(checksum, payload.length);
+
+    return base32Encode(unencoded);
+}
+
+/**
+ * Derive an ed25519 keypair from a 32-byte seed and return the public key bytes
+ * and a signing function compatible with the Stellar server signer.
+ */
+export function ed25519KeypairFromSeed(seed: Uint8Array): {
+    publicKey: Uint8Array;
+    secretKey: Uint8Array;
+} {
+    const keypair = nacl.sign.keyPair.fromSeed(seed);
+    return { publicKey: keypair.publicKey, secretKey: keypair.secretKey };
+}
+
+/**
+ * Sign a message using ed25519 (detached signature).
+ */
+export function ed25519Sign(message: Uint8Array, secretKey: Uint8Array): Uint8Array {
+    return nacl.sign.detached(message, secretKey);
+}