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Code Issues Releases Activity

Simplify package1_get_encrypted_package1

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This commit is contained in:
TuxSH 2018-05-16 02:55:48 +02:00
parent 34a658ce4c
commit f84645e91f
1 changed files with 5 additions and 11 deletions
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16
fusee/fusee-secondary/src/package1.c
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@ -86,25 +86,20 @@ size_t package1_get_tsec_fw(void **tsec_fw, const void *package1loader, size_t p
} }
size_t package1_get_encrypted_package1(package1_header_t **package1, uint8_t *ctr, const void *package1loader, size_t package1loader_size) { size_t package1_get_encrypted_package1(package1_header_t **package1, uint8_t *ctr, const void *package1loader, size_t package1loader_size) {
const uint32_t *pos; const uint8_t *crypt_hdr = (const uint8_t *)package1loader + 0x4000 - 0x20;
uintptr_t pk1l = (uintptr_t)package1loader;
if (package1loader_size < 0x4000) { if (package1loader_size < 0x4000) {
return 0; /* Shouldn't happen, ever. */ return 0; /* Shouldn't happen, ever. */
} }
for (pos = (const uint32_t *)pk1l; (uintptr_t)pos < pk1l + 0x3FF8 && (pos[0] != 0x70012000 || pos[2] != 0x40007000); pos++); memcpy(ctr, crypt_hdr + 0x10, 0x10);
pos = (const uint32_t *)(pk1l + pos[1] - 0x40010000); (*package1) = (package1_header_t *)(crypt_hdr + 0x20);
return *(uint32_t *)crypt_hdr;
memcpy(ctr, pos + 4, 0x10);
(*package1) = (package1_header_t *)(pos + 8);
return *pos;
} }
bool package1_decrypt(package1_header_t *package1, size_t package1_size, const uint8_t *ctr) { bool package1_decrypt(package1_header_t *package1, size_t package1_size, const uint8_t *ctr) {
uint8_t __attribute__((aligned(16))) ctrbuf[16]; uint8_t __attribute__((aligned(16))) ctrbuf[16];
memcpy(ctrbuf, ctr, 16); memcpy(ctrbuf, ctr, 16);
se_aes_ctr_crypt(0xB, package1, package1_size, package1, package1_size, ctr, 16); se_aes_ctr_crypt(0xB, package1, package1_size, package1, package1_size, ctrbuf, 16);
return memcmp(package1->magic, "PK11", 4) == 0; return memcmp(package1->magic, "PK11", 4) == 0;
} }
@ -119,7 +114,6 @@ void *package1_get_warmboot_fw(const package1_header_t *package1) {
Nx-bootloader seems to always start by 0xE328F0C0 (msr cpsr_f, 0xc0). Nx-bootloader seems to always start by 0xE328F0C0 (msr cpsr_f, 0xc0).
*/ */
const uint32_t *data = (const uint32_t *)package1->data; const uint32_t *data = (const uint32_t *)package1->data;
for (size_t i = 0; i < 3; i++) { for (size_t i = 0; i < 3; i++) {
switch (*data) { switch (*data) {
case 0xD5034FDFu: case 0xD5034FDFu: