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crypto: add Sha256Context

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This commit is contained in:
Michael Scire 2020-03-11 03:26:55 -07:00
parent 45f8343659
commit 70367e3e7c
3 changed files with 59 additions and 0 deletions
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21
libraries/libvapours/include/vapours/crypto/crypto_sha256_generator.hpp
View file

@ -22,6 +22,11 @@
namespace ams::crypto {
struct Sha256Context {
u32 intermediate_hash[impl::Sha256Impl::HashSize / sizeof(u32)];
u64 bits_consumed;
};
class Sha256Generator {
private:
using Impl = impl::Sha256Impl;
@ -54,6 +59,22 @@ namespace ams::crypto {
void GetHash(void *dst, size_t size) {
this->impl.GetHash(dst, size);
}
void InitializeWithContext(const Sha256Context *context) {
this->impl.InitializeWithContext(context);
}
size_t GetContext(Sha256Context *context) const {
return this->impl.GetContext(context);
}
size_t GetBufferedDataSize() const {
return this->impl.GetBufferedDataSize();
}
void GetBufferedData(void *dst, size_t dst_size) const {
return this->impl.GetBufferedData(dst, dst_size);
}
};
void GenerateSha256Hash(void *dst, size_t dst_size, const void *src, size_t src_size);

17
libraries/libvapours/include/vapours/crypto/impl/crypto_sha256_impl.hpp
View file

@ -21,6 +21,12 @@
#include <vapours/crypto/impl/crypto_hash_function.hpp>
#include <vapours/crypto/crypto_memory_clear.hpp>
namespace ams::crypto {
struct Sha256Context;
}
namespace ams::crypto::impl {
class Sha256Impl {
@ -47,6 +53,17 @@ namespace ams::crypto::impl {
void Initialize();
void Update(const void *data, size_t size);
void GetHash(void *dst, size_t size);
void InitializeWithContext(const Sha256Context *context);
size_t GetContext(Sha256Context *context) const;
size_t GetBufferedDataSize() const { return this->state.num_buffered; }
void GetBufferedData(void *dst, size_t dst_size) const {
AMS_ASSERT(dst_size >= this->GetBufferedDataSize());
std::memcpy(dst, this->state.buffer, this->GetBufferedDataSize());
}
};
/* static_assert(HashFunction<Sha256Impl>); */

21
libraries/libvapours/source/crypto/impl/crypto_sha256_impl.arch.arm64.cpp
View file

@ -35,6 +35,27 @@ namespace ams::crypto::impl {
::sha256ContextGetHash(reinterpret_cast<::Sha256Context *>(std::addressof(this->state)), dst);
}
void Sha256Impl::InitializeWithContext(const Sha256Context *context) {
static_assert(sizeof(this->state) == sizeof(::Sha256Context));
/* Copy state in from the context. */
std::memcpy(this->state.intermediate_hash, context->intermediate_hash, sizeof(this->state.intermediate_hash));
this->state.bits_consumed = context->bits_consumed;
/* Clear the rest of state. */
std::memset(this->state.buffer, 0, sizeof(this->state.buffer));
this->state.num_buffered = 0;
this->state.finalized = false;
}
size_t Sha256Impl::GetContext(Sha256Context *context) const {
static_assert(sizeof(this->state) == sizeof(::Sha256Context));
std::memcpy(context->intermediate_hash, this->state.intermediate_hash, sizeof(context->intermediate_hash));
context->bits_consumed = this->state.bits_consumed;
return this->state.num_buffered;
}
#else
/* TODO: Non-EL0 implementation. */