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[ctrtool] Improved efficiency of aes-ctr operations.

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This commit is contained in:
jakcron
2016-06-14 20:35:05 +08:00
parent de5c4e1b2a
commit 01cd4cba7b
8 changed files with 96 additions and 44 deletions
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ctrtool/exefs.c
+9 -5
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@@ -124,7 +124,8 @@ void exefs_save(exefs_context* ctx, u32 index, u32 flags)
}
fseeko64(ctx->file, ctx->offset + offset, SEEK_SET);
ctr_init_counter(&ctx->aes, ctx->key, ctx->counter);
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);
if (index == 0 && (ctx->compressedflag || (flags & DecompressCodeFlag)) && ((flags & RawFlag) == 0))
@@ -210,10 +211,12 @@ void exefs_read_header(exefs_context* ctx, u32 flags)
fseeko64(ctx->file, ctx->offset, SEEK_SET);
fread(&ctx->header, 1, sizeof(exefs_header), ctx->file);
ctr_init_counter(&ctx->aes, ctx->key, ctx->counter);
if (ctx->encrypted)
if (ctx->encrypted) {
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_crypt_counter(&ctx->aes, (u8*)&ctx->header, (u8*)&ctx->header, sizeof(exefs_header));
}
}
void exefs_calculate_hash(exefs_context* ctx, u8 hash[32])
@@ -269,7 +272,8 @@ int exefs_verify(exefs_context* ctx, u32 index, u32 flags)
return 0;
fseeko64(ctx->file, ctx->offset + offset, SEEK_SET);
ctr_init_counter(&ctx->aes, ctx->key, ctx->counter);
ctr_init_key(&ctx->aes, ctx->key);
ctr_init_counter(&ctx->aes, ctx->counter);
ctr_add_counter(&ctx->aes, offset / 0x10);
ctr_sha_256_init(&ctx->sha);