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crypto: ccree - add remaining logic for CPP
Add the missing logic to set usage policy protections for keys. This enables key policy protection for AES. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gilad Ben-Yossef
Herbert Xu
parent
cadfd8987a
commit
52f42c650a
@ -34,6 +34,18 @@ struct cc_hw_key_info {
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enum cc_hw_crypto_key key2_slot;
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};
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struct cc_cpp_key_info {
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u8 slot;
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enum cc_cpp_alg alg;
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};
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enum cc_key_type {
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CC_UNPROTECTED_KEY, /* User key */
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CC_HW_PROTECTED_KEY, /* HW (FDE) key */
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CC_POLICY_PROTECTED_KEY, /* CPP key */
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CC_INVALID_PROTECTED_KEY /* Invalid key */
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};
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struct cc_cipher_ctx {
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struct cc_drvdata *drvdata;
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int keylen;
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@ -41,19 +53,22 @@ struct cc_cipher_ctx {
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int cipher_mode;
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int flow_mode;
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unsigned int flags;
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bool hw_key;
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enum cc_key_type key_type;
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struct cc_user_key_info user;
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union {
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struct cc_hw_key_info hw;
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struct cc_cpp_key_info cpp;
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};
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struct crypto_shash *shash_tfm;
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};
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static void cc_cipher_complete(struct device *dev, void *cc_req, int err);
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static inline bool cc_is_hw_key(struct crypto_tfm *tfm)
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static inline enum cc_key_type cc_key_type(struct crypto_tfm *tfm)
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{
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struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm);
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return ctx_p->hw_key;
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return ctx_p->key_type;
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}
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static int validate_keys_sizes(struct cc_cipher_ctx *ctx_p, u32 size)
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@ -232,7 +247,7 @@ struct tdes_keys {
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u8 key3[DES_KEY_SIZE];
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};
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static enum cc_hw_crypto_key cc_slot_to_hw_key(int slot_num)
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static enum cc_hw_crypto_key cc_slot_to_hw_key(u8 slot_num)
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{
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switch (slot_num) {
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case 0:
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@ -247,6 +262,22 @@ static enum cc_hw_crypto_key cc_slot_to_hw_key(int slot_num)
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return END_OF_KEYS;
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}
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static u8 cc_slot_to_cpp_key(u8 slot_num)
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{
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return (slot_num - CC_FIRST_CPP_KEY_SLOT);
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}
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static inline enum cc_key_type cc_slot_to_key_type(u8 slot_num)
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{
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if (slot_num >= CC_FIRST_HW_KEY_SLOT && slot_num <= CC_LAST_HW_KEY_SLOT)
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return CC_HW_PROTECTED_KEY;
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else if (slot_num >= CC_FIRST_CPP_KEY_SLOT &&
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slot_num <= CC_LAST_CPP_KEY_SLOT)
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return CC_POLICY_PROTECTED_KEY;
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else
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return CC_INVALID_PROTECTED_KEY;
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}
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static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
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unsigned int keylen)
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{
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@ -261,18 +292,13 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
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/* STAT_PHASE_0: Init and sanity checks */
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/* This check the size of the hardware key token */
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/* This check the size of the protected key token */
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if (keylen != sizeof(hki)) {
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dev_err(dev, "Unsupported HW key size %d.\n", keylen);
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dev_err(dev, "Unsupported protected key size %d.\n", keylen);
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crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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if (ctx_p->flow_mode != S_DIN_to_AES) {
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dev_err(dev, "HW key not supported for non-AES flows\n");
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return -EINVAL;
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}
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memcpy(&hki, key, keylen);
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/* The real key len for crypto op is the size of the HW key
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@ -286,9 +312,19 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
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return -EINVAL;
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}
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ctx_p->keylen = keylen;
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switch (cc_slot_to_key_type(hki.hw_key1)) {
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case CC_HW_PROTECTED_KEY:
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if (ctx_p->flow_mode == S_DIN_to_SM4) {
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dev_err(dev, "Only AES HW protected keys are supported\n");
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return -EINVAL;
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}
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ctx_p->hw.key1_slot = cc_slot_to_hw_key(hki.hw_key1);
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if (ctx_p->hw.key1_slot == END_OF_KEYS) {
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dev_err(dev, "Unsupported hw key1 number (%d)\n", hki.hw_key1);
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dev_err(dev, "Unsupported hw key1 number (%d)\n",
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hki.hw_key1);
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return -EINVAL;
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}
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@ -300,6 +336,7 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
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hki.hw_key1, hki.hw_key2);
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return -EINVAL;
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}
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ctx_p->hw.key2_slot = cc_slot_to_hw_key(hki.hw_key2);
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if (ctx_p->hw.key2_slot == END_OF_KEYS) {
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dev_err(dev, "Unsupported hw key2 number (%d)\n",
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@ -308,9 +345,37 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
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}
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}
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ctx_p->keylen = keylen;
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ctx_p->hw_key = true;
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dev_dbg(dev, "cc_is_hw_key ret 0");
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ctx_p->key_type = CC_HW_PROTECTED_KEY;
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dev_dbg(dev, "HW protected key %d/%d set\n.",
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ctx_p->hw.key1_slot, ctx_p->hw.key2_slot);
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break;
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case CC_POLICY_PROTECTED_KEY:
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if (ctx_p->drvdata->hw_rev < CC_HW_REV_713) {
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dev_err(dev, "CPP keys not supported in this hardware revision.\n");
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return -EINVAL;
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}
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if (ctx_p->cipher_mode != DRV_CIPHER_CBC &&
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ctx_p->cipher_mode != DRV_CIPHER_CTR) {
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dev_err(dev, "CPP keys only supported in CBC or CTR modes.\n");
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return -EINVAL;
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}
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ctx_p->cpp.slot = cc_slot_to_cpp_key(hki.hw_key1);
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if (ctx_p->flow_mode == S_DIN_to_AES)
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ctx_p->cpp.alg = CC_CPP_AES;
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else /* Must be SM4 since due to sethkey registration */
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ctx_p->cpp.alg = CC_CPP_SM4;
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ctx_p->key_type = CC_POLICY_PROTECTED_KEY;
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dev_dbg(dev, "policy protedcted key alg: %d slot: %d.\n",
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ctx_p->cpp.alg, ctx_p->cpp.slot);
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break;
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default:
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dev_err(dev, "Unsupported protected key (%d)\n", hki.hw_key1);
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return -EINVAL;
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}
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return 0;
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}
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@ -338,7 +403,7 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key,
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return -EINVAL;
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}
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ctx_p->hw_key = false;
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ctx_p->key_type = CC_UNPROTECTED_KEY;
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/*
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* Verify DES weak keys
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@ -451,7 +516,7 @@ static void cc_setup_state_desc(struct crypto_tfm *tfm,
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hw_desc_init(&desc[*seq_size]);
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set_cipher_mode(&desc[*seq_size], cipher_mode);
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set_cipher_config0(&desc[*seq_size], direction);
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if (cc_is_hw_key(tfm)) {
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if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
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set_hw_crypto_key(&desc[*seq_size],
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ctx_p->hw.key2_slot);
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} else {
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@ -495,6 +560,7 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
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dma_addr_t key_dma_addr = ctx_p->user.key_dma_addr;
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unsigned int key_len = ctx_p->keylen;
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unsigned int du_size = nbytes;
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unsigned int din_size;
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struct cc_crypto_alg *cc_alg =
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container_of(tfm->__crt_alg, struct cc_crypto_alg,
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@ -511,27 +577,38 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
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case DRV_CIPHER_ECB:
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/* Load key */
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hw_desc_init(&desc[*seq_size]);
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if (cc_key_type(tfm) == CC_POLICY_PROTECTED_KEY) {
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set_cpp_crypto_key(&desc[*seq_size], ctx_p->cpp.alg,
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cipher_mode, ctx_p->cpp.slot);
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} else {
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set_cipher_mode(&desc[*seq_size], cipher_mode);
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set_cipher_config0(&desc[*seq_size], direction);
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if (flow_mode == S_DIN_to_AES) {
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if (cc_is_hw_key(tfm)) {
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if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
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set_hw_crypto_key(&desc[*seq_size],
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ctx_p->hw.key1_slot);
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} else {
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/* CC_POLICY_UNPROTECTED_KEY
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* Invalid keys are filtered out in
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* sethkey()
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*/
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din_size = (key_len == 24) ?
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AES_MAX_KEY_SIZE : key_len;
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set_din_type(&desc[*seq_size], DMA_DLLI,
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key_dma_addr, ((key_len == 24) ?
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AES_MAX_KEY_SIZE :
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key_len), NS_BIT);
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key_dma_addr, din_size,
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NS_BIT);
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}
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set_key_size_aes(&desc[*seq_size], key_len);
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} else {
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/*des*/
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set_din_type(&desc[*seq_size], DMA_DLLI, key_dma_addr,
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key_len, NS_BIT);
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set_din_type(&desc[*seq_size], DMA_DLLI,
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key_dma_addr, key_len, NS_BIT);
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set_key_size_des(&desc[*seq_size], key_len);
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}
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set_flow_mode(&desc[*seq_size], flow_mode);
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set_setup_mode(&desc[*seq_size], SETUP_LOAD_KEY0);
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}
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(*seq_size)++;
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break;
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case DRV_CIPHER_XTS:
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@ -541,7 +618,7 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
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hw_desc_init(&desc[*seq_size]);
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set_cipher_mode(&desc[*seq_size], cipher_mode);
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set_cipher_config0(&desc[*seq_size], direction);
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if (cc_is_hw_key(tfm)) {
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if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
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set_hw_crypto_key(&desc[*seq_size],
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ctx_p->hw.key1_slot);
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} else {
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@ -789,6 +866,13 @@ static int cc_cipher_process(struct skcipher_request *req,
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cc_req.user_cb = (void *)cc_cipher_complete;
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cc_req.user_arg = (void *)req;
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/* Setup CPP operation details */
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if (ctx_p->key_type == CC_POLICY_PROTECTED_KEY) {
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cc_req.cpp.is_cpp = true;
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cc_req.cpp.alg = ctx_p->cpp.alg;
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cc_req.cpp.slot = ctx_p->cpp.slot;
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}
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/* Setup request context */
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req_ctx->gen_ctx.op_type = direction;
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@ -28,11 +28,13 @@
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GENMASK(CC_REG_HIGH(word, name), CC_REG_LOW(word, name))
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#define WORD0_VALUE CC_GENMASK(0, VALUE)
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#define WORD0_CPP_CIPHER_MODE CC_GENMASK(0, CPP_CIPHER_MODE)
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#define WORD1_DIN_CONST_VALUE CC_GENMASK(1, DIN_CONST_VALUE)
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#define WORD1_DIN_DMA_MODE CC_GENMASK(1, DIN_DMA_MODE)
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#define WORD1_DIN_SIZE CC_GENMASK(1, DIN_SIZE)
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#define WORD1_NOT_LAST CC_GENMASK(1, NOT_LAST)
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#define WORD1_NS_BIT CC_GENMASK(1, NS_BIT)
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#define WORD1_LOCK_QUEUE CC_GENMASK(1, LOCK_QUEUE)
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#define WORD2_VALUE CC_GENMASK(2, VALUE)
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#define WORD3_DOUT_DMA_MODE CC_GENMASK(3, DOUT_DMA_MODE)
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#define WORD3_DOUT_LAST_IND CC_GENMASK(3, DOUT_LAST_IND)
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@ -53,6 +55,8 @@
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#define WORD4_DATA_FLOW_MODE CC_GENMASK(4, DATA_FLOW_MODE)
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#define WORD4_KEY_SIZE CC_GENMASK(4, KEY_SIZE)
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#define WORD4_SETUP_OPERATION CC_GENMASK(4, SETUP_OPERATION)
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#define WORD4_CPP_ALG CC_GENMASK(4, CPP_ALG)
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#define WORD4_CPP_SLOT CC_GENMASK(4, CPP_SLOT)
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#define WORD5_DIN_ADDR_HIGH CC_GENMASK(5, DIN_ADDR_HIGH)
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#define WORD5_DOUT_ADDR_HIGH CC_GENMASK(5, DOUT_ADDR_HIGH)
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@ -176,6 +180,15 @@ enum cc_hw_crypto_key {
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END_OF_KEYS = S32_MAX,
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};
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#define CC_NUM_HW_KEY_SLOTS 4
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#define CC_FIRST_HW_KEY_SLOT 0
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#define CC_LAST_HW_KEY_SLOT (CC_FIRST_HW_KEY_SLOT + CC_NUM_HW_KEY_SLOTS - 1)
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#define CC_NUM_CPP_KEY_SLOTS 8
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#define CC_FIRST_CPP_KEY_SLOT 16
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#define CC_LAST_CPP_KEY_SLOT (CC_FIRST_CPP_KEY_SLOT + \
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CC_NUM_CPP_KEY_SLOTS - 1)
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enum cc_hw_aes_key_size {
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AES_128_KEY = 0,
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AES_192_KEY = 1,
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@ -189,6 +202,8 @@ enum cc_hash_cipher_pad {
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HASH_CIPHER_DO_PADDING_RESERVE32 = S32_MAX,
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};
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#define CC_CPP_DESC_INDICATOR 0xFF0000UL
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/*****************************/
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/* Descriptor packing macros */
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/*****************************/
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@ -248,6 +263,28 @@ static inline void set_din_no_dma(struct cc_hw_desc *pdesc, u32 addr, u32 size)
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pdesc->word[1] |= FIELD_PREP(WORD1_DIN_SIZE, size);
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}
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/*
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* Setup the special CPP descriptor
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*
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* @pdesc: pointer HW descriptor struct
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* @alg: cipher used (AES / SM4)
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* @mode: mode used (CTR or CBC)
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* @slot: slot number
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* @ksize: key size
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*/
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static inline void set_cpp_crypto_key(struct cc_hw_desc *pdesc,
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enum cc_cpp_alg alg,
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enum drv_cipher_mode mode, u8 slot)
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{
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u8 mode_val = (mode == DRV_CIPHER_CBC ? 0 : 1);
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pdesc->word[1] |= FIELD_PREP(WORD1_DIN_SIZE, CC_CPP_DESC_INDICATOR);
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pdesc->word[1] |= FIELD_PREP(WORD1_LOCK_QUEUE, 1);
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pdesc->word[0] |= FIELD_PREP(WORD0_CPP_CIPHER_MODE, mode_val);
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pdesc->word[4] |= FIELD_PREP(WORD4_CPP_ALG, alg);
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pdesc->word[4] |= FIELD_PREP(WORD4_CPP_SLOT, slot);
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}
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/*
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* Set the DIN field of a HW descriptors to SRAM mode.
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* Note: No need to check SRAM alignment since host requests do not use SRAM and
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@ -31,6 +31,8 @@
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#define CC_DSCRPTR_QUEUE_WORD0_REG_OFFSET 0xE80UL
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#define CC_DSCRPTR_QUEUE_WORD0_VALUE_BIT_SHIFT 0x0UL
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#define CC_DSCRPTR_QUEUE_WORD0_VALUE_BIT_SIZE 0x20UL
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#define CC_DSCRPTR_QUEUE_WORD0_CPP_CIPHER_MODE_BIT_SHIFT 0x5UL
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#define CC_DSCRPTR_QUEUE_WORD0_CPP_CIPHER_MODE_BIT_SIZE 0x3UL
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#define CC_DSCRPTR_QUEUE_WORD1_REG_OFFSET 0xE84UL
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#define CC_DSCRPTR_QUEUE_WORD1_DIN_DMA_MODE_BIT_SHIFT 0x0UL
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#define CC_DSCRPTR_QUEUE_WORD1_DIN_DMA_MODE_BIT_SIZE 0x2UL
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@ -97,6 +99,10 @@
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#define CC_DSCRPTR_QUEUE_WORD4_WORD_SWAP_BIT_SIZE 0x1UL
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#define CC_DSCRPTR_QUEUE_WORD4_BYTES_SWAP_BIT_SHIFT 0x1FUL
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#define CC_DSCRPTR_QUEUE_WORD4_BYTES_SWAP_BIT_SIZE 0x1UL
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#define CC_DSCRPTR_QUEUE_WORD4_CPP_SLOT_BIT_SHIFT 0xAUL
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#define CC_DSCRPTR_QUEUE_WORD4_CPP_SLOT_BIT_SIZE 0x3UL
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#define CC_DSCRPTR_QUEUE_WORD4_CPP_ALG_BIT_SHIFT 0xDUL
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#define CC_DSCRPTR_QUEUE_WORD4_CPP_ALG_BIT_SIZE 0x1UL
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#define CC_DSCRPTR_QUEUE_WORD5_REG_OFFSET 0xE94UL
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#define CC_DSCRPTR_QUEUE_WORD5_DIN_ADDR_HIGH_BIT_SHIFT 0x0UL
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#define CC_DSCRPTR_QUEUE_WORD5_DIN_ADDR_HIGH_BIT_SIZE 0x10UL
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