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Support plaintext/unsigned package2

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This commit is contained in:
Michael Scire 2018-04-30 00:01:11 -06:00
parent c1deca93f5
commit e288a141c4
1 changed files with 46 additions and 28 deletions
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74
packages.c
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@ -125,12 +125,25 @@ void pk21_process(pk21_ctx_t *ctx) {
fprintf(stderr, "Failed to read PK21 Header!\n");
exit(EXIT_FAILURE);
}
if (rsa2048_pss_verify(&ctx->header.ctr, 0x100, ctx->header.signature, ctx->tool_ctx->settings.keyset.package2_fixed_key_modulus)) {
ctx->signature_validity = VALIDITY_VALID;
} else {
ctx->signature_validity = VALIDITY_INVALID;
bool is_encrypted = false;
for (unsigned int i = 0; i < 0x100; i++) {
if (ctx->header.signature[i] != 0) {
is_encrypted = true;
}
}
is_encrypted &= ctx->header.magic == MAGIC_PK21;
if (is_encrypted) {
if (rsa2048_pss_verify(&ctx->header.ctr, 0x100, ctx->header.signature, ctx->tool_ctx->settings.keyset.package2_fixed_key_modulus)) {
ctx->signature_validity = VALIDITY_VALID;
} else {
ctx->signature_validity = VALIDITY_INVALID;
}
} else {
ctx->signature_validity = VALIDITY_UNCHECKED;
}
/* Nintendo, what the fuck? */
ctx->package_size = ctx->header.ctr_dwords[0] ^ ctx->header.ctr_dwords[2] ^ ctx->header.ctr_dwords[3];
@ -139,30 +152,33 @@ void pk21_process(pk21_ctx_t *ctx) {
exit(EXIT_FAILURE);
}
unsigned char ctr[0x10];
pk21_header_t temp_header;
memcpy(ctr, ctx->header.ctr, sizeof(ctr));
aes_ctx_t *crypt_ctx = NULL;
for (unsigned int i = 0; i < 0x20; i++) {
ctx->key_rev = i;
memcpy(&temp_header, &ctx->header, sizeof(temp_header));
crypt_ctx = new_aes_ctx(&ctx->tool_ctx->settings.keyset.package2_keys[i], 0x10, AES_MODE_CTR);
aes_setiv(crypt_ctx, ctr, 0x10);
aes_decrypt(crypt_ctx, &temp_header.ctr[0], &temp_header.ctr[0], 0x100);
if (temp_header.magic == MAGIC_PK21) {
memcpy(&ctx->header, &temp_header, sizeof(temp_header));
memcpy(ctx->header.ctr, ctr, sizeof(ctr));
break;
if (is_encrypted) {
unsigned char ctr[0x10];
pk21_header_t temp_header;
memcpy(ctr, ctx->header.ctr, sizeof(ctr));
for (unsigned int i = 0; i < 0x20; i++) {
ctx->key_rev = i;
memcpy(&temp_header, &ctx->header, sizeof(temp_header));
crypt_ctx = new_aes_ctx(&ctx->tool_ctx->settings.keyset.package2_keys[i], 0x10, AES_MODE_CTR);
aes_setiv(crypt_ctx, ctr, 0x10);
aes_decrypt(crypt_ctx, &temp_header.ctr[0], &temp_header.ctr[0], 0x100);
if (temp_header.magic == MAGIC_PK21) {
memcpy(&ctx->header, &temp_header, sizeof(temp_header));
memcpy(ctx->header.ctr, ctr, sizeof(ctr));
break;
}
free_aes_ctx(crypt_ctx);
crypt_ctx = NULL;
}
if (crypt_ctx == NULL) {
fprintf(stderr, "Failed to decrypt PK21! Is correct key present?\n");
exit(EXIT_FAILURE);
}
free_aes_ctx(crypt_ctx);
crypt_ctx = NULL;
}
if (crypt_ctx == NULL) {
fprintf(stderr, "Failed to decrypt PK21! Is correct key present?\n");
exit(EXIT_FAILURE);
}
if (ctx->package_size != 0x200 + ctx->header.section_sizes[0] + ctx->header.section_sizes[1] + ctx->header.section_sizes[2]) {
fprintf(stderr, "Error: Package2 Header is corrupt!\n");
@ -189,8 +205,10 @@ void pk21_process(pk21_ctx_t *ctx) {
} else {
ctx->section_validities[i] = VALIDITY_INVALID;
}
aes_setiv(crypt_ctx, ctx->header.section_ctrs[i], 0x10);
aes_decrypt(crypt_ctx, ctx->sections + offset, ctx->sections + offset, ctx->header.section_sizes[i]);
if (is_encrypted) {
aes_setiv(crypt_ctx, ctx->header.section_ctrs[i], 0x10);
aes_decrypt(crypt_ctx, ctx->sections + offset, ctx->sections + offset, ctx->header.section_sizes[i]);
}
offset += ctx->header.section_sizes[i];
}