diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/hash/shake/shake.cpp')
-rw-r--r-- | comm/third_party/botan/src/lib/hash/shake/shake.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/hash/shake/shake.cpp b/comm/third_party/botan/src/lib/hash/shake/shake.cpp new file mode 100644 index 0000000000..76ed79a274 --- /dev/null +++ b/comm/third_party/botan/src/lib/hash/shake/shake.cpp @@ -0,0 +1,97 @@ +/* +* SHAKE-128/256 as a hash +* (C) 2016 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#include <botan/shake.h> +#include <botan/sha3.h> +#include <botan/exceptn.h> + +namespace Botan { + +SHAKE_128::SHAKE_128(size_t output_bits) : + m_output_bits(output_bits), m_S(25), m_S_pos(0) + { + if(output_bits % 8 != 0) + throw Invalid_Argument("SHAKE_128: Invalid output length " + + std::to_string(output_bits)); + } + +std::string SHAKE_128::name() const + { + return "SHAKE-128(" + std::to_string(m_output_bits) + ")"; + } + +HashFunction* SHAKE_128::clone() const + { + return new SHAKE_128(m_output_bits); + } + +std::unique_ptr<HashFunction> SHAKE_128::copy_state() const + { + return std::unique_ptr<HashFunction>(new SHAKE_128(*this)); + } + +void SHAKE_128::clear() + { + zeroise(m_S); + m_S_pos = 0; + } + +void SHAKE_128::add_data(const uint8_t input[], size_t length) + { + m_S_pos = SHA_3::absorb(SHAKE_128_BITRATE, m_S, m_S_pos, input, length); + } + +void SHAKE_128::final_result(uint8_t output[]) + { + SHA_3::finish(SHAKE_128_BITRATE, m_S, m_S_pos, 0x1F, 0x80); + SHA_3::expand(SHAKE_128_BITRATE, m_S, output, output_length()); + clear(); + } + +SHAKE_256::SHAKE_256(size_t output_bits) : + m_output_bits(output_bits), m_S(25), m_S_pos(0) + { + if(output_bits % 8 != 0) + throw Invalid_Argument("SHAKE_256: Invalid output length " + + std::to_string(output_bits)); + } + +std::string SHAKE_256::name() const + { + return "SHAKE-256(" + std::to_string(m_output_bits) + ")"; + } + +HashFunction* SHAKE_256::clone() const + { + return new SHAKE_256(m_output_bits); + } + +std::unique_ptr<HashFunction> SHAKE_256::copy_state() const + { + return std::unique_ptr<HashFunction>(new SHAKE_256(*this)); + } + +void SHAKE_256::clear() + { + zeroise(m_S); + m_S_pos = 0; + } + +void SHAKE_256::add_data(const uint8_t input[], size_t length) + { + m_S_pos = SHA_3::absorb(SHAKE_256_BITRATE, m_S, m_S_pos, input, length); + } + +void SHAKE_256::final_result(uint8_t output[]) + { + SHA_3::finish(SHAKE_256_BITRATE, m_S, m_S_pos, 0x1F, 0x80); + SHA_3::expand(SHAKE_256_BITRATE, m_S, output, output_length()); + + clear(); + } + +} |