/*
* pkey device driver
*
- * Copyright IBM Corp. 2017,2019
+ * Copyright IBM Corp. 2017, 2023
+ *
* Author(s): Harald Freudenberger
*/
MODULE_DESCRIPTION("s390 protected key interface");
#define KEYBLOBBUFSIZE 8192 /* key buffer size used for internal processing */
+#define MINKEYBLOBBUFSIZE (sizeof(struct keytoken_header))
#define PROTKEYBLOBBUFSIZE 256 /* protected key buffer size used internal */
#define MAXAPQNSINLIST 64 /* max 64 apqns within a apqn list */
#define AES_WK_VP_SIZE 32 /* Size of WK VP block appended to a prot key */
} __packed;
/* inside view of a clear key token (type 0x00 version 0x02) */
-struct clearaeskeytoken {
- u8 type; /* 0x00 for PAES specific key tokens */
+struct clearkeytoken {
+ u8 type; /* 0x00 for PAES specific key tokens */
u8 res0[3];
- u8 version; /* 0x02 for clear AES key token */
+ u8 version; /* 0x02 for clear key token */
u8 res1[3];
- u32 keytype; /* key type, one of the PKEY_KEYTYPE values */
- u32 len; /* bytes actually stored in clearkey[] */
+ u32 keytype; /* key type, one of the PKEY_KEYTYPE_* values */
+ u32 len; /* bytes actually stored in clearkey[] */
u8 clearkey[]; /* clear key value */
} __packed;
+/* helper function which translates the PKEY_KEYTYPE_AES_* to their keysize */
+static inline u32 pkey_keytype_aes_to_size(u32 keytype)
+{
+ switch (keytype) {
+ case PKEY_KEYTYPE_AES_128:
+ return 16;
+ case PKEY_KEYTYPE_AES_192:
+ return 24;
+ case PKEY_KEYTYPE_AES_256:
+ return 32;
+ default:
+ return 0;
+ }
+}
+
/*
* Create a protected key from a clear key value via PCKMO instruction.
*/
/* mask of available pckmo subfunctions */
static cpacf_mask_t pckmo_functions;
- u8 paramblock[64];
+ u8 paramblock[112];
+ u32 pkeytype;
int keysize;
long fc;
switch (keytype) {
case PKEY_KEYTYPE_AES_128:
+ /* 16 byte key, 32 byte aes wkvp, total 48 bytes */
keysize = 16;
+ pkeytype = keytype;
fc = CPACF_PCKMO_ENC_AES_128_KEY;
break;
case PKEY_KEYTYPE_AES_192:
+ /* 24 byte key, 32 byte aes wkvp, total 56 bytes */
keysize = 24;
+ pkeytype = keytype;
fc = CPACF_PCKMO_ENC_AES_192_KEY;
break;
case PKEY_KEYTYPE_AES_256:
+ /* 32 byte key, 32 byte aes wkvp, total 64 bytes */
keysize = 32;
+ pkeytype = keytype;
fc = CPACF_PCKMO_ENC_AES_256_KEY;
break;
+ case PKEY_KEYTYPE_ECC_P256:
+ /* 32 byte key, 32 byte aes wkvp, total 64 bytes */
+ keysize = 32;
+ pkeytype = PKEY_KEYTYPE_ECC;
+ fc = CPACF_PCKMO_ENC_ECC_P256_KEY;
+ break;
+ case PKEY_KEYTYPE_ECC_P384:
+ /* 48 byte key, 32 byte aes wkvp, total 80 bytes */
+ keysize = 48;
+ pkeytype = PKEY_KEYTYPE_ECC;
+ fc = CPACF_PCKMO_ENC_ECC_P384_KEY;
+ break;
+ case PKEY_KEYTYPE_ECC_P521:
+ /* 80 byte key, 32 byte aes wkvp, total 112 bytes */
+ keysize = 80;
+ pkeytype = PKEY_KEYTYPE_ECC;
+ fc = CPACF_PCKMO_ENC_ECC_P521_KEY;
+ break;
+ case PKEY_KEYTYPE_ECC_ED25519:
+ /* 32 byte key, 32 byte aes wkvp, total 64 bytes */
+ keysize = 32;
+ pkeytype = PKEY_KEYTYPE_ECC;
+ fc = CPACF_PCKMO_ENC_ECC_ED25519_KEY;
+ break;
+ case PKEY_KEYTYPE_ECC_ED448:
+ /* 64 byte key, 32 byte aes wkvp, total 96 bytes */
+ keysize = 64;
+ pkeytype = PKEY_KEYTYPE_ECC;
+ fc = CPACF_PCKMO_ENC_ECC_ED448_KEY;
+ break;
default:
DEBUG_ERR("%s unknown/unsupported keytype %u\n",
__func__, keytype);
/* copy created protected key to key buffer including the wkvp block */
*protkeylen = keysize + AES_WK_VP_SIZE;
memcpy(protkey, paramblock, *protkeylen);
- *protkeytype = keytype;
+ *protkeytype = pkeytype;
return 0;
}
int keysize;
int rc;
- switch (keytype) {
- case PKEY_KEYTYPE_AES_128:
- keysize = 16;
- break;
- case PKEY_KEYTYPE_AES_192:
- keysize = 24;
- break;
- case PKEY_KEYTYPE_AES_256:
- keysize = 32;
- break;
- default:
+ keysize = pkey_keytype_aes_to_size(keytype);
+ if (!keysize) {
DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
keytype);
return -EINVAL;
return 0;
}
+/* Helper for pkey_nonccatok2pkey, handles aes clear key token */
+static int nonccatokaes2pkey(const struct clearkeytoken *t,
+ u8 *protkey, u32 *protkeylen, u32 *protkeytype)
+{
+ size_t tmpbuflen = max_t(size_t, SECKEYBLOBSIZE, MAXEP11AESKEYBLOBSIZE);
+ u8 *tmpbuf = NULL;
+ u32 keysize;
+ int rc;
+
+ keysize = pkey_keytype_aes_to_size(t->keytype);
+ if (!keysize) {
+ DEBUG_ERR("%s unknown/unsupported keytype %u\n",
+ __func__, t->keytype);
+ return -EINVAL;
+ }
+ if (t->len != keysize) {
+ DEBUG_ERR("%s non clear key aes token: invalid key len %u\n",
+ __func__, t->len);
+ return -EINVAL;
+ }
+
+ /* try direct way with the PCKMO instruction */
+ rc = pkey_clr2protkey(t->keytype, t->clearkey,
+ protkey, protkeylen, protkeytype);
+ if (!rc)
+ goto out;
+
+ /* PCKMO failed, so try the CCA secure key way */
+ tmpbuf = kmalloc(tmpbuflen, GFP_ATOMIC);
+ if (!tmpbuf)
+ return -ENOMEM;
+ zcrypt_wait_api_operational();
+ rc = cca_clr2seckey(0xFFFF, 0xFFFF, t->keytype, t->clearkey, tmpbuf);
+ if (rc)
+ goto try_via_ep11;
+ rc = pkey_skey2pkey(tmpbuf,
+ protkey, protkeylen, protkeytype);
+ if (!rc)
+ goto out;
+
+try_via_ep11:
+ /* if the CCA way also failed, let's try via EP11 */
+ rc = pkey_clr2ep11key(t->clearkey, t->len,
+ tmpbuf, &tmpbuflen);
+ if (rc)
+ goto failure;
+ rc = pkey_ep11key2pkey(tmpbuf,
+ protkey, protkeylen, protkeytype);
+ if (!rc)
+ goto out;
+
+failure:
+ DEBUG_ERR("%s unable to build protected key from clear", __func__);
+
+out:
+ kfree(tmpbuf);
+ return rc;
+}
+
+/* Helper for pkey_nonccatok2pkey, handles ecc clear key token */
+static int nonccatokecc2pkey(const struct clearkeytoken *t,
+ u8 *protkey, u32 *protkeylen, u32 *protkeytype)
+{
+ u32 keylen;
+ int rc;
+
+ switch (t->keytype) {
+ case PKEY_KEYTYPE_ECC_P256:
+ keylen = 32;
+ break;
+ case PKEY_KEYTYPE_ECC_P384:
+ keylen = 48;
+ break;
+ case PKEY_KEYTYPE_ECC_P521:
+ keylen = 80;
+ break;
+ case PKEY_KEYTYPE_ECC_ED25519:
+ keylen = 32;
+ break;
+ case PKEY_KEYTYPE_ECC_ED448:
+ keylen = 64;
+ break;
+ default:
+ DEBUG_ERR("%s unknown/unsupported keytype %u\n",
+ __func__, t->keytype);
+ return -EINVAL;
+ }
+
+ if (t->len != keylen) {
+ DEBUG_ERR("%s non clear key ecc token: invalid key len %u\n",
+ __func__, t->len);
+ return -EINVAL;
+ }
+
+ /* only one path possible: via PCKMO instruction */
+ rc = pkey_clr2protkey(t->keytype, t->clearkey,
+ protkey, protkeylen, protkeytype);
+ if (rc) {
+ DEBUG_ERR("%s unable to build protected key from clear",
+ __func__);
+ }
+
+ return rc;
+}
+
/*
* Transform a non-CCA key token into a protected key
*/
u8 *protkey, u32 *protkeylen, u32 *protkeytype)
{
struct keytoken_header *hdr = (struct keytoken_header *)key;
- u8 *tmpbuf = NULL;
int rc = -EINVAL;
switch (hdr->version) {
break;
}
case TOKVER_CLEAR_KEY: {
- struct clearaeskeytoken *t;
- struct pkey_clrkey ckey;
- union u_tmpbuf {
- u8 skey[SECKEYBLOBSIZE];
- u8 ep11key[MAXEP11AESKEYBLOBSIZE];
- };
- size_t tmpbuflen = sizeof(union u_tmpbuf);
-
- if (keylen < sizeof(struct clearaeskeytoken))
- goto out;
- t = (struct clearaeskeytoken *)key;
- if (keylen != sizeof(*t) + t->len)
- goto out;
- if ((t->keytype == PKEY_KEYTYPE_AES_128 && t->len == 16) ||
- (t->keytype == PKEY_KEYTYPE_AES_192 && t->len == 24) ||
- (t->keytype == PKEY_KEYTYPE_AES_256 && t->len == 32))
- memcpy(ckey.clrkey, t->clearkey, t->len);
- else
- goto out;
- /* alloc temp key buffer space */
- tmpbuf = kmalloc(tmpbuflen, GFP_ATOMIC);
- if (!tmpbuf) {
- rc = -ENOMEM;
+ struct clearkeytoken *t = (struct clearkeytoken *)key;
+
+ if (keylen < sizeof(struct clearkeytoken) ||
+ keylen != sizeof(*t) + t->len)
goto out;
- }
- /* try direct way with the PCKMO instruction */
- rc = pkey_clr2protkey(t->keytype, ckey.clrkey,
- protkey, protkeylen, protkeytype);
- if (rc == 0)
+ switch (t->keytype) {
+ case PKEY_KEYTYPE_AES_128:
+ case PKEY_KEYTYPE_AES_192:
+ case PKEY_KEYTYPE_AES_256:
+ rc = nonccatokaes2pkey(t, protkey,
+ protkeylen, protkeytype);
break;
- /* PCKMO failed, so try the CCA secure key way */
- zcrypt_wait_api_operational();
- rc = cca_clr2seckey(0xFFFF, 0xFFFF, t->keytype,
- ckey.clrkey, tmpbuf);
- if (rc == 0)
- rc = pkey_skey2pkey(tmpbuf,
- protkey, protkeylen, protkeytype);
- if (rc == 0)
+ case PKEY_KEYTYPE_ECC_P256:
+ case PKEY_KEYTYPE_ECC_P384:
+ case PKEY_KEYTYPE_ECC_P521:
+ case PKEY_KEYTYPE_ECC_ED25519:
+ case PKEY_KEYTYPE_ECC_ED448:
+ rc = nonccatokecc2pkey(t, protkey,
+ protkeylen, protkeytype);
break;
- /* if the CCA way also failed, let's try via EP11 */
- rc = pkey_clr2ep11key(ckey.clrkey, t->len,
- tmpbuf, &tmpbuflen);
- if (rc == 0)
- rc = pkey_ep11key2pkey(tmpbuf,
- protkey, protkeylen, protkeytype);
- /* now we should really have an protected key */
- DEBUG_ERR("%s unable to build protected key from clear",
- __func__);
+ default:
+ DEBUG_ERR("%s unknown/unsupported non cca clear key type %u\n",
+ __func__, t->keytype);
+ return -EINVAL;
+ }
break;
}
case TOKVER_EP11_AES: {
default:
DEBUG_ERR("%s unknown/unsupported non-CCA token version %d\n",
__func__, hdr->version);
- rc = -EINVAL;
}
out:
- kfree(tmpbuf);
return rc;
}
static void *_copy_key_from_user(void __user *ukey, size_t keylen)
{
- if (!ukey || keylen < MINKEYBLOBSIZE || keylen > KEYBLOBBUFSIZE)
+ if (!ukey || keylen < MINKEYBLOBBUFSIZE || keylen > KEYBLOBBUFSIZE)
return ERR_PTR(-EINVAL);
return memdup_user(ukey, keylen);
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