Got this working with the higher-level Swift interface in the BlindSaltSpeke package

Sources/Cbsspeke/bsspeke.c

@@ -232,6 +232,13 @@ bsspeke_server_generate_B(const uint8_t P[32],
 
 }
 
+void
+bsspeke_server_get_B(uint8_t B[32],
+                     bsspeke_server_ctx *server)
+{
+    memcpy(B, server->B, 32);
+}
+
 int
 bsspeke_client_generate_keys_from_password(const uint8_t blind_salt[32],
                                            uint32_t phf_blocks, uint32_t phf_iterations,
@@ -365,6 +372,13 @@ bsspeke_client_generate_A(const uint8_t blind_salt[32],
     return 0;
 }
 
+void
+bsspeke_client_get_A(uint8_t A[32],
+                     bsspeke_client_ctx *client)
+{
+    memcpy(A, client->A, 32);
+}
+
 void
 bsspeke_client_derive_shared_key(const uint8_t B[32],
                                  bsspeke_client_ctx *client)
@@ -455,7 +469,7 @@ bsspeke_server_derive_shared_key(const uint8_t A[32],
 }
 
 int
-bsspeke_server_verify_client(uint8_t client_verifier[32],
+bsspeke_server_verify_client(const uint8_t client_verifier[32],
                              bsspeke_server_ctx *server
 ) {
 

Sources/Cbsspeke/include/bsspeke.h

@@ -21,6 +21,9 @@
 #ifndef BSSPEKE_H
 #define BSSPEKE_H
 
+#include <stddef.h>
+#include <sys/types.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -34,6 +37,8 @@ extern "C" {
 #define BSSPEKE_ARGON2_MIN_PHF_BLOCKS 100000
 #define BSSPEKE_ARGON2_MIN_PHF_ITERATIONS 3
 
+//typedef unsigned char uint8_t;
+
 typedef struct {
     // Login credentials
     uint8_t client_id[256];
@@ -101,6 +106,10 @@ void
 bsspeke_server_generate_B(const uint8_t P[32],
                           bsspeke_server_ctx *server);
 
+void
+bsspeke_server_get_B(uint8_t B[32],
+                     bsspeke_server_ctx *server);
+
 int
 bsspeke_client_generate_P_and_V(uint8_t P[32], uint8_t V[32],
                                 const uint8_t blind_salt[32],
@@ -112,6 +121,10 @@ bsspeke_client_generate_A(const uint8_t blind_salt[32],
                           uint32_t phf_blocks, uint32_t phf_iterations,
                           bsspeke_client_ctx *client);
 
+void
+bsspeke_client_get_A(uint8_t A[32],
+                     bsspeke_client_ctx *client);
+
 void
 bsspeke_client_derive_shared_key(const uint8_t B[32],
                                  bsspeke_client_ctx *client);
@@ -127,7 +140,7 @@ bsspeke_server_derive_shared_key(const uint8_t A[32],
                                  bsspeke_server_ctx *server);
 
 int
-bsspeke_server_verify_client(uint8_t client_verifier[32],
+bsspeke_server_verify_client(const uint8_t client_verifier[32],
                              bsspeke_server_ctx *server);
 
 void

Tests/CbsspekeTests/CbsspekeTests.swift

 import XCTest
-@testable import BSSpeke
+@testable import Cbsspeke
 
 final class CbsspekeTests: XCTestCase {
     func testExample() throws {