Splitting cmd_xxx() functions in separate files.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/hsm/cmd_key_unwrap.c

@@ -0,0 +1,106 @@
+/* 
+ * This file is part of the Pico HSM distribution (https://github.com/polhenarejos/pico-hsm).
+ * Copyright (c) 2022 Pol Henarejos.
+ * 
+ * This program is free software: you can redistribute it and/or modify  
+ * it under the terms of the GNU General Public License as published by  
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License 
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#include "crypto_utils.h"
+#include "sc_hsm.h"
+#include "kek.h"
+
+int cmd_key_unwrap() {
+    int key_id = P1(apdu), r = 0;
+    if (P2(apdu) != 0x93)
+        return SW_WRONG_P1P2();
+    if (!isUserAuthenticated)
+        return SW_SECURITY_STATUS_NOT_SATISFIED();
+    int key_type = dkek_type_key(apdu.data);
+    uint8_t kdom = -1, *allowed = NULL;
+    size_t allowed_len = 0;
+    if (key_type == 0x0)
+        return SW_DATA_INVALID();
+    if (key_type == HSM_KEY_RSA) {
+        mbedtls_rsa_context ctx;
+        mbedtls_rsa_init(&ctx);
+        do {
+            r = dkek_decode_key(++kdom, &ctx, apdu.data, apdu.nc, NULL, &allowed, &allowed_len);
+        } while((r == CCID_ERR_FILE_NOT_FOUND || r == CCID_WRONG_DKEK) && kdom < MAX_KEY_DOMAINS);
+        if (r != CCID_OK) {
+            mbedtls_rsa_free(&ctx);
+            return SW_EXEC_ERROR();
+        }
+        r = store_keys(&ctx, HSM_KEY_RSA, key_id);
+        mbedtls_rsa_free(&ctx);
+        if (r != CCID_OK) {
+            return SW_EXEC_ERROR();
+        }
+    }
+    else if (key_type == HSM_KEY_EC) {
+        mbedtls_ecdsa_context ctx;
+        mbedtls_ecdsa_init(&ctx);
+        do {
+            r = dkek_decode_key(++kdom, &ctx, apdu.data, apdu.nc, NULL, &allowed, &allowed_len);
+        } while((r == CCID_ERR_FILE_NOT_FOUND || r == CCID_WRONG_DKEK) && kdom < MAX_KEY_DOMAINS);
+        if (r != CCID_OK) {
+            mbedtls_ecdsa_free(&ctx);
+            return SW_EXEC_ERROR();
+        }
+        r = store_keys(&ctx, HSM_KEY_EC, key_id);
+        mbedtls_ecdsa_free(&ctx);
+        if (r != CCID_OK) {
+            return SW_EXEC_ERROR();
+        }
+    }
+    else if (key_type == HSM_KEY_AES) {
+        uint8_t aes_key[32];
+        int key_size = 0, aes_type = 0;
+        do {
+            r = dkek_decode_key(++kdom, aes_key, apdu.data, apdu.nc, &key_size, &allowed, &allowed_len);
+        } while((r == CCID_ERR_FILE_NOT_FOUND || r == CCID_WRONG_DKEK) && kdom < MAX_KEY_DOMAINS);
+        if (r != CCID_OK) {
+            return SW_EXEC_ERROR();
+        }
+        if (key_size == 32)
+            aes_type = HSM_KEY_AES_256;
+        else if (key_size == 24)
+            aes_type = HSM_KEY_AES_192;
+        else if (key_size == 16)
+            aes_type = HSM_KEY_AES_128;
+        else
+            return SW_EXEC_ERROR();
+        r = store_keys(aes_key, aes_type, key_id);
+        if (r != CCID_OK) {
+            return SW_EXEC_ERROR();
+        }
+    }
+    if ((allowed != NULL && allowed_len > 0) || kdom >= 0) {
+        size_t meta_len = (allowed_len > 0 ? 2+allowed_len : 0) + (kdom >= 0 ? 3 : 0);
+        uint8_t *meta = (uint8_t *)calloc(1,meta_len), *m = meta;
+        if (allowed_len > 0) {
+            *m++ = 0x91;
+            *m++ = allowed_len;
+            memcpy(m, allowed, allowed_len); m += allowed_len;
+        }
+        if (kdom >= 0) {
+            *m++ = 0x92;
+            *m++ = 1;
+            *m++ = kdom;
+        }
+        r = meta_add((KEY_PREFIX << 8) | key_id, meta, meta_len);
+        free(meta);
+        if (r != CCID_OK)
+            return r;
+    }
+    return SW_OK();
+}