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Atmosphere/exosphere/se.c
2018-02-19 13:27:18 -08:00

362 lines
12 KiB
C

#include <stdint.h>
#include <stddef.h>
#include "utils.h"
#include "cache.h"
#include "se.h"
void trigger_se_rsa_op(void *buf, size_t size);
void trigger_se_blocking_op(unsigned int op, void *dst, size_t dst_size, const void *src, size_t src_size);
/* Globals for driver. */
volatile security_engine_t *g_security_engine;
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. */
if (buffer != NULL) {
ll->addr_info.address = get_physical_address(buffer);
ll->addr_info.size = (uint32_t) size;
} else {
ll->addr_info.address = 0;
ll->addr_info.size = 0;
}
flush_dcache_range((uint8_t *)ll, (uint8_t *)ll + sizeof(*ll));
}
/* Set the global security engine pointer. */
void set_security_engine_address(security_engine_t *security_engine) {
g_security_engine = security_engine;
}
/* Get the global security engine pointer. */
security_engine_t *get_security_engine_address(void) {
return g_security_engine;
}
void set_security_engine_callback(unsigned int (*callback)(void)) {
if (callback == NULL || g_se_callback != NULL) {
panic();
}
g_se_callback = callback;
}
/* Fires on Security Engine operation completion. */
void se_operation_completed(void) {
if (g_security_engine == NULL) {
panic();
}
g_security_engine->INT_ENABLE_REG = 0;
if (g_se_callback != NULL) {
g_se_callback();
g_se_callback = NULL;
}
}
/* Set the flags for an AES keyslot. */
void set_aes_keyslot_flags(unsigned int keyslot, unsigned int flags) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_AES_MAX) {
panic();
}
/* Misc flags. */
if (flags & ~0x80) {
g_security_engine->AES_KEYSLOT_FLAGS[keyslot] = ~flags;
}
/* Disable keyslot reads. */
if (flags & 0x80) {
g_security_engine->AES_KEY_READ_DISABLE_REG &= ~(1 << keyslot);
}
}
/* Set the flags for an RSA keyslot. */
void set_rsa_keyslot_flags(unsigned int keyslot, unsigned int flags) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_RSA_MAX) {
panic();
}
/* Misc flags. */
if (flags & ~0x80) {
/* TODO: Why are flags assigned this way? */
g_security_engine->RSA_KEYSLOT_FLAGS[keyslot] = (((flags >> 4) & 4) | (flags & 3)) ^ 7;
}
/* Disable keyslot reads. */
if (flags & 0x80) {
g_security_engine->RSA_KEY_READ_DISABLE_REG &= ~(1 << keyslot);
}
}
void clear_aes_keyslot(unsigned int keyslot) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_AES_MAX) {
panic();
}
/* Zero out the whole keyslot and IV. */
for (unsigned int i = 0; i < 0x10; i++) {
g_security_engine->AES_KEYTABLE_ADDR = (keyslot << 4) | i;
g_security_engine->AES_KEYTABLE_DATA = 0;
}
}
void clear_rsa_keyslot(unsigned int keyslot) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_RSA_MAX) {
panic();
}
/* Zero out the whole keyslot. */
for (unsigned int i = 0; i < 0x40; i++) {
/* Select Keyslot Modulus[i] */
g_security_engine->RSA_KEYTABLE_ADDR = (keyslot << 7) | i | 0x40;
g_security_engine->RSA_KEYTABLE_DATA = 0;
}
for (unsigned int i = 0; i < 0x40; i++) {
/* Select Keyslot Expontent[i] */
g_security_engine->RSA_KEYTABLE_ADDR = (keyslot << 7) | i;
g_security_engine->RSA_KEYTABLE_DATA = 0;
}
}
void set_aes_keyslot(unsigned int keyslot, const void *key, size_t key_size) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_AES_MAX || key_size > KEYSIZE_AES_MAX) {
panic();
}
for (size_t i = 0; i < (key_size >> 2); i++) {
g_security_engine->AES_KEYTABLE_ADDR = (keyslot << 4) | i;
g_security_engine->AES_KEYTABLE_DATA = read32le(key, 4 * i);
}
}
void set_rsa_keyslot(unsigned int keyslot, const void *modulus, size_t modulus_size, const void *exponent, size_t exp_size) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_RSA_MAX || modulus_size > KEYSIZE_RSA_MAX || exp_size > KEYSIZE_RSA_MAX) {
panic();
}
for (size_t i = 0; i < (modulus_size >> 2); i++) {
g_security_engine->RSA_KEYTABLE_ADDR = (keyslot << 7) | 0x40 | i;
g_security_engine->RSA_KEYTABLE_DATA = read32be(modulus, 4 * i);
}
for (size_t i = 0; i < (exp_size >> 2); i++) {
g_security_engine->RSA_KEYTABLE_ADDR = (keyslot << 7) | i;
g_security_engine->RSA_KEYTABLE_DATA = read32be(exponent, 4 * i);
}
g_se_modulus_sizes[keyslot] = modulus_size;
g_se_exp_sizes[keyslot] = exp_size;
}
void set_aes_keyslot_iv(unsigned int keyslot, const void *iv, size_t iv_size) {
if (g_security_engine == NULL || keyslot >= KEYSLOT_AES_MAX || iv_size > 0x10) {
panic();
}
for (size_t i = 0; i < (iv_size >> 2); i++) {
g_security_engine->AES_KEYTABLE_ADDR = (keyslot << 4) | 8 | i;
g_security_engine->AES_KEYTABLE_DATA = read32le(iv, 4 * i);
}
}
void set_se_ctr(const void *ctr) {
if (g_security_engine == NULL) {
panic();
}
for (unsigned int i = 0; i < 4; i++) {
g_security_engine->CRYPTO_CTR_REG[i] = read32le(ctr, i * 4);
}
}
void decrypt_data_into_keyslot(unsigned int keyslot_dst, unsigned int keyslot_src, const void *wrapped_key, size_t wrapped_key_size) {
if (g_security_engine == NULL || keyslot_dst >= KEYSLOT_AES_MAX || keyslot_src >= KEYSIZE_AES_MAX || wrapped_key_size > KEYSIZE_AES_MAX) {
panic();
}
g_security_engine->CONFIG_REG = (ALG_AES_DEC | DST_KEYTAB);
g_security_engine->CRYPTO_REG = keyslot_src << 24;
g_security_engine->BLOCK_COUNT_REG = 0;
g_security_engine->CRYPTO_KEYTABLE_DST_REG = keyslot_dst << 8;
flush_dcache_range(wrapped_key, (const uint8_t *)wrapped_key + wrapped_key_size);
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);
/* Enable SE Interrupt firing for async op. */
g_security_engine->INT_ENABLE_REG = 0x10;
/* 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_exp_mod(unsigned int keyslot, void *buf, size_t size, unsigned int (*callback)(void)) {
uint8_t stack_buf[KEYSIZE_RSA_MAX];
if (g_security_engine == NULL || keyslot >= KEYSLOT_RSA_MAX || size > KEYSIZE_RSA_MAX) {
panic();
}
/* Endian swap the input. */
for (size_t i = size; i > 0; i--) {
stack_buf[i] = *((uint8_t *)buf + size - i);
}
g_security_engine->CONFIG_REG = (ALG_RSA | DST_RSAREG);
g_security_engine->RSA_CONFIG = keyslot << 24;
g_security_engine->RSA_KEY_SIZE_REG = (g_se_modulus_sizes[keyslot] >> 6) - 1;
g_security_engine->RSA_EXP_SIZE_REG = g_se_exp_sizes[keyslot] >> 2;
set_security_engine_callback(callback);
/* Enable SE Interrupt firing for async op. */
g_security_engine->INT_ENABLE_REG = 0x10;
flush_dcache_range(stack_buf, stack_buf + KEYSIZE_RSA_MAX);
trigger_se_rsa_op(stack_buf, size);
while (!(g_security_engine->INT_STATUS_REG & 2)) { /* Wait a while */ }
}
void se_get_exp_mod_output(void *buf, size_t size) {
size_t num_dwords = (size >> 2);
if (num_dwords < 1) {
return;
}
uint32_t *p_out = ((uint32_t *)buf) + num_dwords - 1;
uint32_t out_ofs = 0;
/* Copy endian swapped output. */
while (num_dwords) {
*p_out = read32be(g_security_engine->RSA_OUTPUT, offset);
offset += 4;
p_out--;
num_dwords--;
}
}
void trigger_se_rsa_op(void *buf, size_t size) {
se_ll_t in_ll;
ll_init(&in_ll, buf, size);
/* Set the input LL. */
g_security_engine->IN_LL_ADDR_REG = get_physical_address(&in_ll);
/* 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 trigger_se_blocking_op(unsigned int op, void *dst, size_t dst_size, const void *src, size_t src_size) {
se_ll_t in_ll;
se_ll_t out_ll;
ll_init(&in_ll, src, src_size);
ll_init(&out_ll, dst, dst_size);
/* Set the LLs. */
g_security_engine->IN_LL_ADDR_REG = get_physical_address(&in_ll);
g_security_enging->OUT_LL_ADDR_REG = get_physical_address(&out_ll);
/* 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 = op;
while (!(g_security_engine->INT_STATUS_REG & 0x10)) { /* Wait a while */ }
se_check_for_error();
}
void se_check_for_error(void) {
if (g_security_engine == NULL) {
panic();
}
if (g_security_engine->INT_STATUS_REG & 0x10000 || g_security_engine->FLAGS_REG & 3 || g_security_engine->ERR_STATUS_REG) {
panic();
}
}