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exo2: fix bugs in device unique data decrypytion

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Michael Scire 2020-05-18 00:37:39 -07:00 • committed by SciresM
parent b922dff414
commit 1e0124fb67
2 changed files with 24 additions and 9 deletions
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8
libraries/libvapours/source/crypto/impl/crypto_gcm_mode_impl.arch.arm64.cpp
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@ -188,7 +188,7 @@ namespace ams::crypto::impl {
if (this->aad_remaining > 0) {
while (aad_size > 0) {
/* Copy in a byte of the aad to our partial block. */
this->block_x.block_8[BlockSize - 1 - this->aad_remaining] ^= *(cur_aad++);
this->block_x.block_8[this->aad_remaining] ^= *(cur_aad++);
/* Note that we consumed a byte. */
--aad_size;
@ -205,7 +205,7 @@ namespace ams::crypto::impl {
while (aad_size >= BlockSize) {
/* Xor the current aad into our work block. */
for (size_t i = 0; i < BlockSize; ++i) {
this->block_x.block_8[BlockSize - 1 - i] ^= *(cur_aad++);
this->block_x.block_8[i] ^= *(cur_aad++);
}
/* Multiply the blocks in our galois field. */
@ -222,7 +222,7 @@ namespace ams::crypto::impl {
/* Xor the data in. */
for (size_t i = 0; i < aad_size; ++i) {
this->block_x.block_8[BlockSize - 1 - i] ^= *(cur_aad++);
this->block_x.block_8[i] ^= *(cur_aad++);
}
}
}
@ -285,7 +285,7 @@ namespace ams::crypto::impl {
GaloisFieldMult(std::addressof(this->block_x), std::addressof(this->block_x), std::addressof(this->h_mult_blocks[0]));
/* If we need to do an encryption, do so. */
{
if (encrypt) {
/* Encrypt the iv. */
u8 enc_result[BlockSize];
this->ProcessBlock(enc_result, std::addressof(this->block_ek0), this->block_cipher);