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/*
* CommonCrypto Hash Functions
* (C) 2018 Jose Pereira
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/commoncrypto.h>
#include <botan/hash.h>
#include <unordered_map>
#include <CommonCrypto/CommonCrypto.h>
namespace Botan {
namespace {
template <class CTX>
class CommonCrypto_HashFunction final : public HashFunction
{
public:
struct digest_config_t {
std::string name;
size_t digestLength;
size_t blockSize;
int (*init)(CTX *);
int (*update)(CTX *, const void *, CC_LONG len);
int (*final)(unsigned char *, CTX*);
};
void clear() override
{
if(m_info.init(&m_ctx) != 1)
throw CommonCrypto_Error("CC_" + m_info.name + "_Init");
}
std::string provider() const override { return "commoncrypto"; }
std::string name() const override { return m_info.name; }
HashFunction* clone() const override
{
return new CommonCrypto_HashFunction(m_info);
}
std::unique_ptr<HashFunction> copy_state() const override
{
return std::unique_ptr<CommonCrypto_HashFunction>(
new CommonCrypto_HashFunction(m_info, m_ctx));
}
size_t output_length() const override
{
return m_info.digestLength;
}
size_t hash_block_size() const override
{
return m_info.blockSize;
}
CommonCrypto_HashFunction(const digest_config_t& info) :
m_info(info)
{
clear();
}
CommonCrypto_HashFunction(const digest_config_t& info, const CTX &ctx) :
m_ctx(ctx), m_info(info) {}
private:
void add_data(const uint8_t input[], size_t length) override
{
/* update len parameter is 32 bit unsigned integer, feed input in parts */
while (length > 0)
{
CC_LONG update_len = (length > 0xFFFFFFFFUL) ? 0xFFFFFFFFUL : static_cast<CC_LONG>(length);
m_info.update(&m_ctx, input, update_len);
input += update_len;
length -= update_len;
}
}
void final_result(uint8_t output[]) override
{
if(m_info.final(output, &m_ctx) != 1)
throw CommonCrypto_Error("CC_" + m_info.name + "_Final");
clear();
}
CTX m_ctx;
digest_config_t m_info;
};
}
std::unique_ptr<HashFunction>
make_commoncrypto_hash(const std::string& name)
{
#define MAKE_COMMONCRYPTO_HASH_3(name, hash, ctx) \
std::unique_ptr<HashFunction>( \
new CommonCrypto_HashFunction<CC_ ## ctx ## _CTX >({ \
name, \
CC_ ## hash ## _DIGEST_LENGTH, \
CC_ ## hash ## _BLOCK_BYTES, \
CC_ ## hash ## _Init, \
CC_ ## hash ## _Update, \
CC_ ## hash ## _Final \
}));
#define MAKE_COMMONCRYPTO_HASH_2(name, id) \
MAKE_COMMONCRYPTO_HASH_3(name, id, id)
#define MAKE_COMMONCRYPTO_HASH_1(id) \
MAKE_COMMONCRYPTO_HASH_2(#id, id)
#if defined(BOTAN_HAS_SHA2_32)
if(name == "SHA-224")
return MAKE_COMMONCRYPTO_HASH_3(name, SHA224, SHA256);
if(name == "SHA-256")
return MAKE_COMMONCRYPTO_HASH_2(name, SHA256);
#endif
#if defined(BOTAN_HAS_SHA2_64)
if(name == "SHA-384")
return MAKE_COMMONCRYPTO_HASH_3(name, SHA384, SHA512);
if(name == "SHA-512")
return MAKE_COMMONCRYPTO_HASH_2(name, SHA512);
#endif
#if defined(BOTAN_HAS_SHA1)
if(name == "SHA-160" || name == "SHA-1" || name == "SHA1")
return MAKE_COMMONCRYPTO_HASH_2(name, SHA1);
#endif
return nullptr;
}
}
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