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Async SE AES API

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This commit is contained in:
Michael Scire 2018-02-19 13:00:12 -08:00
parent 83fd2c43a3
commit 21c2405f15
2 changed files with 80 additions and 3 deletions
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72
exosphere/se.c
View file

@ -16,6 +16,7 @@ unsigned int (*g_se_callback)(void);
unsigned int g_se_modulus_sizes[KEYSLOT_RSA_MAX];
unsigned int g_se_exp_sizes[KEYSLOT_RSA_MAX];
/* Initialize a SE linked list. */
void ll_init(se_ll_t *ll, void *buffer, size_t size) {
ll->num_entries = 0; /* 1 Entry. */
@ -192,8 +193,77 @@ void decrypt_data_into_keyslot(unsigned int keyslot_dst, unsigned int keyslot_sr
trigger_se_aes_op(OP_START, NULL, 0, wrapped_key, wrapped_key_size);
}
void se_aes_crypt_insecure_internal(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, unsigned int crypt_config, int encrypt, unsigned int (*callback)(void)) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_AES_MAX) {
panic();
}
if (size == 0) {
return;
}
/* Setup Config register. */
encrypt &= 1;
if (encrypt) {
g_security_engine->CONFIG_REG = (ALG_AES_ENC | DST_MEMORY);
} else {
g_security_engine->CONFIG_REG = (ALG_AES_DEC | DST_MEMORY);
}
/* Setup Crypto register. */
g_security_engine->CRYPTO_REG = crypt_config | (keyslot << 24) | (encrypt << 8);
/* Mark this encryption as insecure -- this makes the SE not a secure busmaster. */
g_security_engine->CRYPTO_REG |= 0x80000000;
/* Appropriate number of blocks. */
g_security_engine->BLOCK_COUNT_REG = (size >> 4) - 1;
/* Set the callback, for after the async operation. */
set_security_engine_callback(callback);
/* Setup Input/Output lists */
g_security_engine->IN_LL_ADDR_REG = in_ll_paddr;
g_security_engine->OUT_LL_ADDR_REG = out_ll_paddr;
/* Set registers for operation. */
g_security_engine->ERR_STATUS_REG = g_security_engine->ERR_STATUS_REG;
g_security_engine->INT_STATUS_REG = g_security_engine->INT_STATUS_REG;
g_security_engine->OPERATION_REG = 1;
/* Ensure writes go through. */
__asm__ __volatile__ ("dsb ish" : : : "memory");
}
void se_aes_ctr_crypt_insecure(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, const void *ctr, unsigned int (*callback)(void)) {
if (g_security_engine == NULL) {
panic();
}
/* Unknown what this write does, but official code writes it for CTR mode. */
g_security_engine->_0x80C = 1;
set_se_ctr(ctr);
se_aes_crypt_insecure_internal(keyslot, out_ll_paddr, in_ll_paddr, size, 0x81E, 1, callback);
}
void se_aes_cbc_encrypt_insecure(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, const void *iv, unsigned int (*callback)(void)) {
if (g_security_engine == NULL) {
panic();
}
set_aes_keyslot_iv(keyslot, iv, 0x10);
se_aes_crypt_insecure_internal(keyslot, out_ll_paddr, in_ll_paddr, size, 0x44, 1, callback);
}
void se_aes_cbc_decrypt_insecure(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, const void *iv, unsigned int (*callback)(void)) {
if (g_security_engine == NULL) {
panic();
}
set_aes_keyslot_iv(keyslot, iv, 0x10);
se_aes_crypt_insecure_internal(keyslot, out_ll_paddr, in_ll_paddr, size, 0x66, 0, callback);
}
void se_crypt_aes(unsigned int keyslot, void *dst, size_t dst_size, const void *src, size_t src_size, unsigned int config, unsigned int mode, unsigned int (*callback)(void));
void se_exp_mod(unsigned int keyslot, void *buf, size_t size, unsigned int (*callback)(void)) {
uint8_t stack_buf[KEYSIZE_RSA_MAX];

11
exosphere/se.h
View file

@ -28,7 +28,8 @@
#define DST_SRK (3 << DST_SHIFT)
#define DST_RSAREG (4 << DST_SHIFT)
#define HASH_DISABLE (0x0)
#define HASH_ENABLE (0x1)
#define OP_ABORT 0
#define OP_START 1
@ -123,11 +124,17 @@ void set_rsa_keyslot(unsigned int keyslot, const void *modulus, size_t modulus_s
void set_aes_keyslot_iv(unsigned int keyslot, const void *iv, size_t iv_size);
void set_se_ctr(const void *ctr);
/* AES API */
void se_aes_ctr_crypt_insecure(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, const void *ctr, unsigned int (*callback)(void));
void se_aes_cbc_encrypt_insecure(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, const void *iv, unsigned int (*callback)(void));
void se_aes_cbc_decrypt_insecure(unsigned int keyslot, uint32_t out_ll_paddr, uint32_t in_ll_paddr, size_t size, const void *iv, unsigned int (*callback)(void));
void se_crypt_aes(unsigned int keyslot, void *dst, size_t dst_size, const void *src, size_t src_size, unsigned int config, unsigned int mode, unsigned int (*callback)(void));
void se_exp_mod(unsigned int keyslot, void *buf, size_t size, unsigned int (*callback)(void));
void se_get_exp_mod_output(void *buf, size_t size);
void se_generate_random(unsigned int keyslot, void *dst, size_t size);