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/*
* BearSSL Hash Functions
* (C) 1999-2007,2015 Jack Lloyd
* (C) 2017 Patrick Wildt
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/hash.h>
#include <botan/internal/bearssl.h>
#include <unordered_map>
extern "C" {
#include <bearssl_hash.h>
}
namespace Botan {
namespace {
class BearSSL_HashFunction final : public HashFunction
{
public:
void clear() override
{
m_ctx.vtable->init(&m_ctx.vtable);
}
std::string provider() const override { return "bearssl"; }
std::string name() const override { return m_name; }
HashFunction* clone() const override
{
return new BearSSL_HashFunction(m_ctx.vtable, m_name);
}
std::unique_ptr<HashFunction> copy_state() const override
{
std::unique_ptr<BearSSL_HashFunction> copy(new BearSSL_HashFunction(m_ctx.vtable, m_name));
memcpy(©->m_ctx, &m_ctx, sizeof(m_ctx));
return std::move(copy);
}
size_t output_length() const override
{
return (m_ctx.vtable->desc >> BR_HASHDESC_OUT_OFF) & BR_HASHDESC_OUT_MASK;
}
size_t hash_block_size() const override
{
return 1 << ((m_ctx.vtable->desc >> BR_HASHDESC_LBLEN_OFF) & BR_HASHDESC_LBLEN_MASK);
}
BearSSL_HashFunction(const br_hash_class *hash, const std::string name)
{
m_name = name;
hash->init(&m_ctx.vtable);
}
~BearSSL_HashFunction()
{
}
private:
void add_data(const uint8_t input[], size_t length) override
{
m_ctx.vtable->update(&m_ctx.vtable, input, length);
}
void final_result(uint8_t output[]) override
{
m_ctx.vtable->out(&m_ctx.vtable, output);
m_ctx.vtable->init(&m_ctx.vtable);
}
std::string m_name;
br_hash_compat_context m_ctx;
};
}
std::unique_ptr<HashFunction>
make_bearssl_hash(const std::string& name)
{
#define MAKE_BEARSSL_HASH(vtable) \
std::unique_ptr<HashFunction>(new BearSSL_HashFunction(vtable, name))
#if defined(BOTAN_HAS_SHA2_32)
if(name == "SHA-224")
return MAKE_BEARSSL_HASH(&br_sha224_vtable);
if(name == "SHA-256")
return MAKE_BEARSSL_HASH(&br_sha256_vtable);
#endif
#if defined(BOTAN_HAS_SHA2_64)
if(name == "SHA-384")
return MAKE_BEARSSL_HASH(&br_sha384_vtable);
if(name == "SHA-512")
return MAKE_BEARSSL_HASH(&br_sha512_vtable);
#endif
#if defined(BOTAN_HAS_SHA1)
if(name == "SHA-160" || name == "SHA-1" || name == "SHA1")
return MAKE_BEARSSL_HASH(&br_sha1_vtable);
#endif
#if defined(BOTAN_HAS_MD5)
if(name == "MD5")
return MAKE_BEARSSL_HASH(&br_md5_vtable);
#endif
#if defined(BOTAN_HAS_PARALLEL_HASH)
if(name == "Parallel(MD5,SHA-160)")
return MAKE_BEARSSL_HASH(&br_md5sha1_vtable);
#endif
return nullptr;
}
}
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