From 2a96cd07e4bc019e5906914ddb440d41a2a48912 Mon Sep 17 00:00:00 2001 From: Ernesto Castellotti Date: Sun, 6 Aug 2023 15:08:26 +0200 Subject: [PATCH] Add support for XChaCha --- source/botan/stream/chacha.d | 144 +++++++++++++++++++++++++++-------- test_data/stream/chacha.vec | 17 +++++ 2 files changed, 128 insertions(+), 33 deletions(-) diff --git a/source/botan/stream/chacha.d b/source/botan/stream/chacha.d index 5d39b644d..9023623a1 100644 --- a/source/botan/stream/chacha.d +++ b/source/botan/stream/chacha.d @@ -3,7 +3,7 @@ * * Copyright: * (C) 2014 Jack Lloyd -* (C) 2014-2015 Etienne Cimon +* (C) 2014-2018 Etienne Cimon * * License: * Botan is released under the Simplified BSD License (see LICENSE.md) @@ -68,9 +68,7 @@ public: if (!validIvLength(length)) throw new InvalidIVLength(name, length); - m_state[12] = 0; - - m_state[13] = 0; + initializeState(); if(length == 0) { @@ -84,6 +82,28 @@ public: m_state[13] = loadLittleEndian!uint(iv, 0); m_state[14] = loadLittleEndian!uint(iv, 1); m_state[15] = loadLittleEndian!uint(iv, 2); + } else if (length == 24) { + m_state[12] = loadLittleEndian!uint(iv, 0); + m_state[13] = loadLittleEndian!uint(iv, 1); + m_state[14] = loadLittleEndian!uint(iv, 2); + m_state[15] = loadLittleEndian!uint(iv, 3); + + auto hc = SecureVector!uint(8); + hchacha(*cast(uint[8]*) hc.ptr, *cast(uint[16]*) m_state.ptr, m_rounds); + + m_state[ 4] = hc[0]; + m_state[ 5] = hc[1]; + m_state[ 6] = hc[2]; + m_state[ 7] = hc[3]; + m_state[ 8] = hc[4]; + m_state[ 9] = hc[5]; + m_state[10] = hc[6]; + m_state[11] = hc[7]; + m_state[12] = 0; + m_state[13] = 0; + + m_state[14] = loadLittleEndian!uint(iv, 4); + m_state[15] = loadLittleEndian!uint(iv, 5); } version(SIMD_SSE2) { if (CPUID.hasSse2()) @@ -94,7 +114,7 @@ public: } override bool validIvLength(size_t iv_len) const - { return (iv_len == 0 || iv_len == 8 || iv_len == 12); } + { return (iv_len == 0 || iv_len == 8 || iv_len == 12 || iv_len == 24); } KeyLengthSpecification keySpec() const { @@ -106,6 +126,7 @@ public: */ void clear() { + zap(m_key); zap(m_state); zap(m_buffer); m_position = 0; @@ -123,44 +144,65 @@ public: protected: + void initializeState() + { + __gshared immutable uint[] TAU = [ 0x61707865, 0x3120646e, 0x79622d36, 0x6b206574 ]; + + __gshared immutable uint[] SIGMA = [ 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 ]; + + m_state[4] = m_key[0]; + m_state[5] = m_key[1]; + m_state[6] = m_key[2]; + m_state[7] = m_key[3]; + + if(m_key.length == 4) + { + m_state[0] = TAU[0]; + m_state[1] = TAU[1]; + m_state[2] = TAU[2]; + m_state[3] = TAU[3]; + + m_state[8] = m_key[0]; + m_state[9] = m_key[1]; + m_state[10] = m_key[2]; + m_state[11] = m_key[3]; + } + else + { + m_state[0] = SIGMA[0]; + m_state[1] = SIGMA[1]; + m_state[2] = SIGMA[2]; + m_state[3] = SIGMA[3]; + + m_state[8] = m_key[4]; + m_state[9] = m_key[5]; + m_state[10] = m_key[6]; + m_state[11] = m_key[7]; + } + + m_state[12] = 0; + m_state[13] = 0; + m_state[14] = 0; + m_state[15] = 0; + + m_position = 0; + } + /* * ChaCha Key Schedule */ override void keySchedule(const(ubyte)* key, size_t length) { - __gshared immutable uint[] TAU = [ 0x61707865, 0x3120646e, 0x79622d36, 0x6b206574 ]; - - __gshared immutable uint[] SIGMA = [ 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 ]; - - const uint[] CONSTANTS = (length == 16) ? TAU : SIGMA; + m_key.resize(length / 4); + loadLittleEndian!uint(m_key.ptr, key, m_key.length); - // Repeat the key if 128bits - const(ubyte)* key2 = (length == 32) ? key + 16 : key; - m_position = 0; m_state.resize(16); m_buffer.resize(4*64); - - m_state[0] = CONSTANTS[0]; - m_state[1] = CONSTANTS[1]; - m_state[2] = CONSTANTS[2]; - m_state[3] = CONSTANTS[3]; - - m_state[4] = loadLittleEndian!uint(key, 0); - m_state[5] = loadLittleEndian!uint(key, 1); - m_state[6] = loadLittleEndian!uint(key, 2); - m_state[7] = loadLittleEndian!uint(key, 3); - - m_state[8] = loadLittleEndian!uint(key2, 0); - m_state[9] = loadLittleEndian!uint(key2, 1); - m_state[10] = loadLittleEndian!uint(key2, 2); - m_state[11] = loadLittleEndian!uint(key2, 3); - - // Default all-zero IV - - const ubyte[8] ZERO; - setIv(ZERO.ptr, ZERO.length); + + setIv(null, 0); } + SecureVector!uint m_key; SecureVector!uint m_state; SecureVector!ubyte m_buffer; size_t m_position = 0; @@ -174,6 +216,42 @@ enum string CHACHA_QUARTER_ROUND(alias _a, alias _b, alias _c, alias _d) = q{ %3$s += %4$s; %2$s ^= %3$s; %2$s = rotateLeft(%2$s, 7); }.format(__traits(identifier, _a), __traits(identifier, _b), __traits(identifier, _c), __traits(identifier, _d)); +/* +* Generate HChaCha cipher stream (for XChaCha IV setup) +*/ +private void hchacha(ref uint[8] output, const(uint)[16] input, size_t rounds) +{ + assert(rounds % 2 == 0, "Valid rounds"); + + uint x00 = input[ 0], x01 = input[ 1], x02 = input[ 2], x03 = input[ 3], + x04 = input[ 4], x05 = input[ 5], x06 = input[ 6], x07 = input[ 7], + x08 = input[ 8], x09 = input[ 9], x10 = input[10], x11 = input[11], + x12 = input[12], x13 = input[13], x14 = input[14], x15 = input[15]; + + for (size_t i = 0; i != rounds / 2; ++i) + { + mixin(CHACHA_QUARTER_ROUND!(x00, x04, x08, x12) ~ + CHACHA_QUARTER_ROUND!(x01, x05, x09, x13) ~ + CHACHA_QUARTER_ROUND!(x02, x06, x10, x14) ~ + CHACHA_QUARTER_ROUND!(x03, x07, x11, x15) ~ + + CHACHA_QUARTER_ROUND!(x00, x05, x10, x15) ~ + CHACHA_QUARTER_ROUND!(x01, x06, x11, x12) ~ + CHACHA_QUARTER_ROUND!(x02, x07, x08, x13) ~ + CHACHA_QUARTER_ROUND!(x03, x04, x09, x14) + ); + } + + output[0] = x00; + output[1] = x01; + output[2] = x02; + output[3] = x03; + output[4] = x12; + output[5] = x13; + output[6] = x14; + output[7] = x15; +} + private void chachax4(ref ubyte[64*4] output, ref uint[16] input, size_t rounds) { assert(rounds % 2 == 0, "Valid rounds"); diff --git a/test_data/stream/chacha.vec b/test_data/stream/chacha.vec index cecf798f3..59c00763f 100644 --- a/test_data/stream/chacha.vec +++ b/test_data/stream/chacha.vec @@ -159,3 +159,20 @@ Key = 0000000000000000000000000000000000000000000000000000000000000000 Nonce = 000000000000000000000000 In = 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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Out = 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+ +# XChaCha tests from https://github.com/aead/chacha20 + +Key = 0000000000000000000000000000000000000000000000000000000000000000 +Nonce = 000000000000000000000000000000000000000000000000 +In = 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 +Out = bcd02a18bf3f01d19292de30a7a8fdaca4b65e50a6002cc72cd6d2f7c91ac3d5728f83e0aad2bfcf9abd2d2db58faedd65015dd83fc09b131e271043019e8e0f789e9689e5208d7fd9e1f3c5b5341f48ef18a13e418998addadd97a3693a987f8e82ecd5c1433bfed1af49750c0f1ff29c4174a05b119aa3a9e8333812e0c0fea49e1ee0134a70a9d49c24e0cbd8fc3ba27e97c3322ad487f778f8dc6a122fa59cbe33e7 + +Key = 8000000000000000000000000000000000000000000000000000000000000000 +Nonce = 000000000000000000000000000000000000000000000000 +In = 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 +Out = 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 + +Key = 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f +Nonce = 000102030405060708090a0b0c0d0e0f1011121314151617 +In = 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 +Out = e53a61cef151e81401067de33adfc02e90ab205361b49b539fda7f0e63b1bc7d68fbee56c9c20c39960e595f3ea76c979804d08cfa728e66cb5f766b840ec61f9ec20f7f90d28dae334426cecb52a8e84b4728a5fdd61deb7f1a3fb63dadf5595e06b6e441670964d595ae59cf21536271bae2594774fb19079b933d8fe744f4