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/*
* OpenSSL Hash Functions
* (C) 1999-2007,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/hash.h>
#include <botan/internal/openssl.h>
#include <openssl/evp.h>
#include <unordered_map>
namespace Botan {
namespace {
class OpenSSL_HashFunction final : public HashFunction
{
public:
void clear() override
{
const EVP_MD* algo = EVP_MD_CTX_md(m_md);
if(!EVP_DigestInit_ex(m_md, algo, nullptr))
throw OpenSSL_Error("EVP_DigestInit_ex", ERR_get_error());
}
std::string provider() const override { return "openssl"; }
std::string name() const override { return m_name; }
HashFunction* clone() const override
{
const EVP_MD* algo = EVP_MD_CTX_md(m_md);
return new OpenSSL_HashFunction(name(), algo);
}
std::unique_ptr<HashFunction> copy_state() const override
{
std::unique_ptr<OpenSSL_HashFunction> copy(new OpenSSL_HashFunction(m_name, nullptr));
EVP_MD_CTX_copy(copy->m_md, m_md);
return std::unique_ptr<HashFunction>(copy.release());
}
size_t output_length() const override
{
return EVP_MD_size(EVP_MD_CTX_md(m_md));
}
size_t hash_block_size() const override
{
return EVP_MD_block_size(EVP_MD_CTX_md(m_md));
}
OpenSSL_HashFunction(const std::string& name, const EVP_MD* md) : m_name(name)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L
m_md = EVP_MD_CTX_create();
#else
m_md = EVP_MD_CTX_new();
#endif
if(m_md == nullptr)
throw OpenSSL_Error("Can't allocate new context", ERR_get_error());
EVP_MD_CTX_init(m_md);
if(md && !EVP_DigestInit_ex(m_md, md, nullptr))
throw OpenSSL_Error("EVP_DigestInit_ex", ERR_get_error());
}
OpenSSL_HashFunction(EVP_MD_CTX* ctx) : m_md(ctx)
{
}
~OpenSSL_HashFunction()
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L
EVP_MD_CTX_destroy(m_md);
#else
EVP_MD_CTX_free(m_md);
#endif
}
private:
void add_data(const uint8_t input[], size_t length) override
{
if(!EVP_DigestUpdate(m_md, input, length))
throw OpenSSL_Error("EVP_DigestUpdate", ERR_get_error());
}
void final_result(uint8_t output[]) override
{
if(!EVP_DigestFinal_ex(m_md, output, nullptr))
throw OpenSSL_Error("EVP_DigestFinal_ex", ERR_get_error());
const EVP_MD* algo = EVP_MD_CTX_md(m_md);
if(!EVP_DigestInit_ex(m_md, algo, nullptr))
throw OpenSSL_Error("EVP_DigestInit_ex", ERR_get_error());
}
std::string m_name;
EVP_MD_CTX* m_md;
};
}
std::unique_ptr<HashFunction>
make_openssl_hash(const std::string& name)
{
#define MAKE_OPENSSL_HASH(fn) \
std::unique_ptr<HashFunction>(new OpenSSL_HashFunction(name, fn ()))
#if defined(BOTAN_HAS_SHA2_32) && !defined(OPENSSL_NO_SHA256)
if(name == "SHA-224")
return MAKE_OPENSSL_HASH(EVP_sha224);
if(name == "SHA-256")
return MAKE_OPENSSL_HASH(EVP_sha256);
#endif
#if defined(BOTAN_HAS_SHA2_64) && !defined(OPENSSL_NO_SHA512)
if(name == "SHA-384")
return MAKE_OPENSSL_HASH(EVP_sha384);
if(name == "SHA-512")
return MAKE_OPENSSL_HASH(EVP_sha512);
#endif
#if defined(BOTAN_HAS_SHA1) && !defined(OPENSSL_NO_SHA)
if(name == "SHA-160" || name == "SHA-1" || name == "SHA1")
return MAKE_OPENSSL_HASH(EVP_sha1);
#endif
#if defined(BOTAN_HAS_MD5) && !defined(OPENSSL_NO_MD5)
if(name == "MD5")
return MAKE_OPENSSL_HASH(EVP_md5);
#endif
return nullptr;
}
}
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