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warmboot: add code for decrypting/restoring tzram.

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This commit is contained in:
Michael Scire
2018-12-18 15:55:16 -08:00
parent 3924a2ef76
commit 95a9e1e215
4 changed files with 63 additions and 1 deletions
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14
exosphere/lp0fw/src/se.c
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@@ -236,3 +236,17 @@ void se_compute_aes_cmac(unsigned int keyslot, void *cmac, size_t cmac_size, con
void se_compute_aes_256_cmac(unsigned int keyslot, void *cmac, size_t cmac_size, const void *data, size_t data_size) {
se_compute_aes_cmac(keyslot, cmac, cmac_size, data, data_size, 0x202);
}
void se_aes_256_cbc_decrypt(unsigned int keyslot, void *dst, size_t dst_size, const void *src, size_t src_size) {
volatile tegra_se_t *se = se_get_regs();
if (keyslot >= KEYSLOT_AES_MAX || src_size < 0x10) {
reboot();
}
se->CONFIG_REG = (ALG_AES_DEC | DST_MEMORY) | (0x202 << 16);
se->CRYPTO_REG = (keyslot << 24) | 0x66;
clear_aes_keyslot_iv(keyslot);
se->BLOCK_COUNT_REG = (src_size >> 4) - 1;
trigger_se_blocking_op(OP_START, dst, dst_size, src, src_size);
}