diff --git a/Makefile.am b/Makefile.am index f7a29386..20ff518b 100644 --- a/Makefile.am +++ b/Makefile.am @@ -25,6 +25,8 @@ UTIL_FILES = \ coord/names.hpp \ coord/ops.hpp \ coord/store.hpp \ + crypto/arc4.cpp \ + crypto/arc4.hpp \ debug.cpp \ debug.hpp \ endian.cpp \ @@ -261,6 +263,7 @@ TEST_BIN = \ test/bitwise \ test/checksum \ test/colour \ + test/crypto/arc4 \ test/extent \ test/fixed \ test/float \ diff --git a/crypto/arc4.cpp b/crypto/arc4.cpp new file mode 100644 index 00000000..adaa8bd7 --- /dev/null +++ b/crypto/arc4.cpp @@ -0,0 +1,65 @@ +/* + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * Copyright 2015 Danny Robson + */ + +#include "arc4.hpp" + +#include + +using util::crypto::ARC4; + + +/////////////////////////////////////////////////////////////////////////////// +ARC4::ARC4 (const uint8_t *restrict key, size_t len): + x (0), + y (0) +{ + std::iota (S.begin (), S.end (), 0); + + for (size_t i = 0, j = 0; i < 256; ++i) { + j = (j + S[i] + key[i % len]) % 256; + std::swap (S[i], S[j]); + } +} + + +//----------------------------------------------------------------------------- +void +ARC4::discard (size_t len) +{ + while (len--) + get (); +} + + +//----------------------------------------------------------------------------- +void +ARC4::generate (uint8_t *restrict dst, size_t len) +{ + std::generate_n (dst, len, [this] (void) { return get (); }); +} + + +//----------------------------------------------------------------------------- +uint8_t +ARC4::get (void) +{ + x = (x + 1) % 256; + y = (y + S[x]) % 256; + + std::swap (S[x], S[y]); + + return S[(S[x] + S[y]) % 256]; +} diff --git a/crypto/arc4.hpp b/crypto/arc4.hpp new file mode 100644 index 00000000..973c822e --- /dev/null +++ b/crypto/arc4.hpp @@ -0,0 +1,40 @@ +/* + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * Copyright 2015 Danny Robson + */ + +#ifndef __UTIL_RC4_HPP +#define __UTIL_RC4_HPP + +#include +#include +#include + +namespace util { namespace crypto { + class ARC4 { + public: + ARC4 (const uint8_t *restrict key, size_t len); + + void discard (size_t); + void generate (uint8_t *restrict dst, size_t len); + + private: + uint8_t get (void); + + size_t x, y; + std::array S; + }; +} } + +#endif diff --git a/test/crypto/arc4.cpp b/test/crypto/arc4.cpp new file mode 100644 index 00000000..9b70293a --- /dev/null +++ b/test/crypto/arc4.cpp @@ -0,0 +1,391 @@ +#include "crypto/arc4.hpp" +#include "tap.hpp" +#include "types.hpp" + +int +main () +{ + util::TAP::logger tap; + + // Test vectors from RFC 6229. + static const size_t OFFSETS[] = { + 0, 16, 240, 256, 496, 512, 752, 768, 1008, 1024, 1520, 1536, 2032, 2048, 3056, 3072, 4080, 4096 + }; + + struct { + std::vector key; + const uint64_t data[elems (OFFSETS)][16]; + } TESTS[] = { + { + { 1, 2, 3, 4, 5 }, + { + { 0xb2, 0x39, 0x63, 0x05, 0xf0, 0x3d, 0xc0, 0x27, 0xcc, 0xc3, 0x52, 0x4a, 0x0a, 0x11, 0x18, 0xa8 }, + { 0x69, 0x82, 0x94, 0x4f, 0x18, 0xfc, 0x82, 0xd5, 0x89, 0xc4, 0x03, 0xa4, 0x7a, 0x0d, 0x09, 0x19 }, + { 0x28, 0xcb, 0x11, 0x32, 0xc9, 0x6c, 0xe2, 0x86, 0x42, 0x1d, 0xca, 0xad, 0xb8, 0xb6, 0x9e, 0xae }, + { 0x1c, 0xfc, 0xf6, 0x2b, 0x03, 0xed, 0xdb, 0x64, 0x1d, 0x77, 0xdf, 0xcf, 0x7f, 0x8d, 0x8c, 0x93 }, + { 0x42, 0xb7, 0xd0, 0xcd, 0xd9, 0x18, 0xa8, 0xa3, 0x3d, 0xd5, 0x17, 0x81, 0xc8, 0x1f, 0x40, 0x41 }, + { 0x64, 0x59, 0x84, 0x44, 0x32, 0xa7, 0xda, 0x92, 0x3c, 0xfb, 0x3e, 0xb4, 0x98, 0x06, 0x61, 0xf6 }, + { 0xec, 0x10, 0x32, 0x7b, 0xde, 0x2b, 0xee, 0xfd, 0x18, 0xf9, 0x27, 0x76, 0x80, 0x45, 0x7e, 0x22 }, + { 0xeb, 0x62, 0x63, 0x8d, 0x4f, 0x0b, 0xa1, 0xfe, 0x9f, 0xca, 0x20, 0xe0, 0x5b, 0xf8, 0xff, 0x2b }, + { 0x45, 0x12, 0x90, 0x48, 0xe6, 0xa0, 0xed, 0x0b, 0x56, 0xb4, 0x90, 0x33, 0x8f, 0x07, 0x8d, 0xa5 }, + { 0x30, 0xab, 0xbc, 0xc7, 0xc2, 0x0b, 0x01, 0x60, 0x9f, 0x23, 0xee, 0x2d, 0x5f, 0x6b, 0xb7, 0xdf }, + { 0x32, 0x94, 0xf7, 0x44, 0xd8, 0xf9, 0x79, 0x05, 0x07, 0xe7, 0x0f, 0x62, 0xe5, 0xbb, 0xce, 0xea }, + { 0xd8, 0x72, 0x9d, 0xb4, 0x18, 0x82, 0x25, 0x9b, 0xee, 0x4f, 0x82, 0x53, 0x25, 0xf5, 0xa1, 0x30 }, + { 0x1e, 0xb1, 0x4a, 0x0c, 0x13, 0xb3, 0xbf, 0x47, 0xfa, 0x2a, 0x0b, 0xa9, 0x3a, 0xd4, 0x5b, 0x8b }, + { 0xcc, 0x58, 0x2f, 0x8b, 0xa9, 0xf2, 0x65, 0xe2, 0xb1, 0xbe, 0x91, 0x12, 0xe9, 0x75, 0xd2, 0xd7 }, + { 0xf2, 0xe3, 0x0f, 0x9b, 0xd1, 0x02, 0xec, 0xbf, 0x75, 0xaa, 0xad, 0xe9, 0xbc, 0x35, 0xc4, 0x3c }, + { 0xec, 0x0e, 0x11, 0xc4, 0x79, 0xdc, 0x32, 0x9d, 0xc8, 0xda, 0x79, 0x68, 0xfe, 0x96, 0x56, 0x81 }, + { 0x06, 0x83, 0x26, 0xa2, 0x11, 0x84, 0x16, 0xd2, 0x1f, 0x9d, 0x04, 0xb2, 0xcd, 0x1c, 0xa0, 0x50 }, + { 0xff, 0x25, 0xb5, 0x89, 0x95, 0x99, 0x67, 0x07, 0xe5, 0x1f, 0xbd, 0xf0, 0x8b, 0x34, 0xd8, 0x75 }, + } + }, + + { + { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }, + { + { 0x29, 0x3f, 0x02, 0xd4, 0x7f, 0x37, 0xc9, 0xb6, 0x33, 0xf2, 0xaf, 0x52, 0x85, 0xfe, 0xb4, 0x6b }, + { 0xe6, 0x20, 0xf1, 0x39, 0x0d, 0x19, 0xbd, 0x84, 0xe2, 0xe0, 0xfd, 0x75, 0x20, 0x31, 0xaf, 0xc1 }, + { 0x91, 0x4f, 0x02, 0x53, 0x1c, 0x92, 0x18, 0x81, 0x0d, 0xf6, 0x0f, 0x67, 0xe3, 0x38, 0x15, 0x4c }, + { 0xd0, 0xfd, 0xb5, 0x83, 0x07, 0x3c, 0xe8, 0x5a, 0xb8, 0x39, 0x17, 0x74, 0x0e, 0xc0, 0x11, 0xd5 }, + { 0x75, 0xf8, 0x14, 0x11, 0xe8, 0x71, 0xcf, 0xfa, 0x70, 0xb9, 0x0c, 0x74, 0xc5, 0x92, 0xe4, 0x54 }, + { 0x0b, 0xb8, 0x72, 0x02, 0x93, 0x8d, 0xad, 0x60, 0x9e, 0x87, 0xa5, 0xa1, 0xb0, 0x79, 0xe5, 0xe4 }, + { 0xc2, 0x91, 0x12, 0x46, 0xb6, 0x12, 0xe7, 0xe7, 0xb9, 0x03, 0xdf, 0xed, 0xa1, 0xda, 0xd8, 0x66 }, + { 0x32, 0x82, 0x8f, 0x91, 0x50, 0x2b, 0x62, 0x91, 0x36, 0x8d, 0xe8, 0x08, 0x1d, 0xe3, 0x6f, 0xc2 }, + { 0xf3, 0xb9, 0xa7, 0xe3, 0xb2, 0x97, 0xbf, 0x9a, 0xd8, 0x04, 0x51, 0x2f, 0x90, 0x63, 0xef, 0xf1 }, + { 0x8e, 0xcb, 0x67, 0xa9, 0xba, 0x1f, 0x55, 0xa5, 0xa0, 0x67, 0xe2, 0xb0, 0x26, 0xa3, 0x67, 0x6f }, + { 0xd2, 0xaa, 0x90, 0x2b, 0xd4, 0x2d, 0x0d, 0x7c, 0xfd, 0x34, 0x0c, 0xd4, 0x58, 0x10, 0x52, 0x9f }, + { 0x78, 0xb2, 0x72, 0xc9, 0x6e, 0x42, 0xea, 0xb4, 0xc6, 0x0b, 0xd9, 0x14, 0xe3, 0x9d, 0x06, 0xe3 }, + { 0xf4, 0x33, 0x2f, 0xd3, 0x1a, 0x07, 0x93, 0x96, 0xee, 0x3c, 0xee, 0x3f, 0x2a, 0x4f, 0xf0, 0x49 }, + { 0x05, 0x45, 0x97, 0x81, 0xd4, 0x1f, 0xda, 0x7f, 0x30, 0xc1, 0xbe, 0x7e, 0x12, 0x46, 0xc6, 0x23 }, + { 0xad, 0xfd, 0x38, 0x68, 0xb8, 0xe5, 0x14, 0x85, 0xd5, 0xe6, 0x10, 0x01, 0x7e, 0x3d, 0xd6, 0x09 }, + { 0xad, 0x26, 0x58, 0x1c, 0x0c, 0x5b, 0xe4, 0x5f, 0x4c, 0xea, 0x01, 0xdb, 0x2f, 0x38, 0x05, 0xd5 }, + { 0xf3, 0x17, 0x2c, 0xef, 0xfc, 0x3b, 0x3d, 0x99, 0x7c, 0x85, 0xcc, 0xd5, 0xaf, 0x1a, 0x95, 0x0c }, + { 0xe7, 0x4b, 0x0b, 0x97, 0x31, 0x22, 0x7f, 0xd3, 0x7c, 0x0e, 0xc0, 0x8a, 0x47, 0xdd, 0xd8, 0xb8 }, + } + }, + + { + { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 }, + { + { 0x97, 0xab, 0x8a, 0x1b, 0xf0, 0xaf, 0xb9, 0x61, 0x32, 0xf2, 0xf6, 0x72, 0x58, 0xda, 0x15, 0xa8 }, + { 0x82, 0x63, 0xef, 0xdb, 0x45, 0xc4, 0xa1, 0x86, 0x84, 0xef, 0x87, 0xe6, 0xb1, 0x9e, 0x5b, 0x09 }, + { 0x96, 0x36, 0xeb, 0xc9, 0x84, 0x19, 0x26, 0xf4, 0xf7, 0xd1, 0xf3, 0x62, 0xbd, 0xdf, 0x6e, 0x18 }, + { 0xd0, 0xa9, 0x90, 0xff, 0x2c, 0x05, 0xfe, 0xf5, 0xb9, 0x03, 0x73, 0xc9, 0xff, 0x4b, 0x87, 0x0a }, + { 0x73, 0x23, 0x9f, 0x1d, 0xb7, 0xf4, 0x1d, 0x80, 0xb6, 0x43, 0xc0, 0xc5, 0x25, 0x18, 0xec, 0x63 }, + { 0x16, 0x3b, 0x31, 0x99, 0x23, 0xa6, 0xbd, 0xb4, 0x52, 0x7c, 0x62, 0x61, 0x26, 0x70, 0x3c, 0x0f }, + { 0x49, 0xd6, 0xc8, 0xaf, 0x0f, 0x97, 0x14, 0x4a, 0x87, 0xdf, 0x21, 0xd9, 0x14, 0x72, 0xf9, 0x66 }, + { 0x44, 0x17, 0x3a, 0x10, 0x3b, 0x66, 0x16, 0xc5, 0xd5, 0xad, 0x1c, 0xee, 0x40, 0xc8, 0x63, 0xd0 }, + { 0x27, 0x3c, 0x9c, 0x4b, 0x27, 0xf3, 0x22, 0xe4, 0xe7, 0x16, 0xef, 0x53, 0xa4, 0x7d, 0xe7, 0xa4 }, + { 0xc6, 0xd0, 0xe7, 0xb2, 0x26, 0x25, 0x9f, 0xa9, 0x02, 0x34, 0x90, 0xb2, 0x61, 0x67, 0xad, 0x1d }, + { 0x1f, 0xe8, 0x98, 0x67, 0x13, 0xf0, 0x7c, 0x3d, 0x9a, 0xe1, 0xc1, 0x63, 0xff, 0x8c, 0xf9, 0xd3 }, + { 0x83, 0x69, 0xe1, 0xa9, 0x65, 0x61, 0x0b, 0xe8, 0x87, 0xfb, 0xd0, 0xc7, 0x91, 0x62, 0xaa, 0xfb }, + { 0x0a, 0x01, 0x27, 0xab, 0xb4, 0x44, 0x84, 0xb9, 0xfb, 0xef, 0x5a, 0xbc, 0xae, 0x1b, 0x57, 0x9f }, + { 0xc2, 0xcd, 0xad, 0xc6, 0x40, 0x2e, 0x8e, 0xe8, 0x66, 0xe1, 0xf3, 0x7b, 0xdb, 0x47, 0xe4, 0x2c }, + { 0x26, 0xb5, 0x1e, 0xa3, 0x7d, 0xf8, 0xe1, 0xd6, 0xf7, 0x6f, 0xc3, 0xb6, 0x6a, 0x74, 0x29, 0xb3 }, + { 0xbc, 0x76, 0x83, 0x20, 0x5d, 0x4f, 0x44, 0x3d, 0xc1, 0xf2, 0x9d, 0xda, 0x33, 0x15, 0xc8, 0x7b }, + { 0xd5, 0xfa, 0x5a, 0x34, 0x69, 0xd2, 0x9a, 0xaa, 0xf8, 0x3d, 0x23, 0x58, 0x9d, 0xb8, 0xc8, 0x5b }, + { 0x3f, 0xb4, 0x6e, 0x2c, 0x8f, 0x0f, 0x06, 0x8e, 0xdc, 0xe8, 0xcd, 0xcd, 0x7d, 0xfc, 0x58, 0x62 }, + } + }, + + { + { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a }, + + { + { 0xed, 0xe3, 0xb0, 0x46, 0x43, 0xe5, 0x86, 0xcc, 0x90, 0x7d, 0xc2, 0x18, 0x51, 0x70, 0x99, 0x02, }, + { 0x03, 0x51, 0x6b, 0xa7, 0x8f, 0x41, 0x3b, 0xeb, 0x22, 0x3a, 0xa5, 0xd4, 0xd2, 0xdf, 0x67, 0x11, }, + { 0x3c, 0xfd, 0x6c, 0xb5, 0x8e, 0xe0, 0xfd, 0xde, 0x64, 0x01, 0x76, 0xad, 0x00, 0x00, 0x04, 0x4d, }, + { 0x48, 0x53, 0x2b, 0x21, 0xfb, 0x60, 0x79, 0xc9, 0x11, 0x4c, 0x0f, 0xfd, 0x9c, 0x04, 0xa1, 0xad, }, + { 0x3e, 0x8c, 0xea, 0x98, 0x01, 0x71, 0x09, 0x97, 0x90, 0x84, 0xb1, 0xef, 0x92, 0xf9, 0x9d, 0x86, }, + { 0xe2, 0x0f, 0xb4, 0x9b, 0xdb, 0x33, 0x7e, 0xe4, 0x8b, 0x8d, 0x8d, 0xc0, 0xf4, 0xaf, 0xef, 0xfe, }, + { 0x5c, 0x25, 0x21, 0xea, 0xcd, 0x79, 0x66, 0xf1, 0x5e, 0x05, 0x65, 0x44, 0xbe, 0xa0, 0xd3, 0x15, }, + { 0xe0, 0x67, 0xa7, 0x03, 0x19, 0x31, 0xa2, 0x46, 0xa6, 0xc3, 0x87, 0x5d, 0x2f, 0x67, 0x8a, 0xcb, }, + { 0xa6, 0x4f, 0x70, 0xaf, 0x88, 0xae, 0x56, 0xb6, 0xf8, 0x75, 0x81, 0xc0, 0xe2, 0x3e, 0x6b, 0x08, }, + { 0xf4, 0x49, 0x03, 0x1d, 0xe3, 0x12, 0x81, 0x4e, 0xc6, 0xf3, 0x19, 0x29, 0x1f, 0x4a, 0x05, 0x16, }, + { 0xbd, 0xae, 0x85, 0x92, 0x4b, 0x3c, 0xb1, 0xd0, 0xa2, 0xe3, 0x3a, 0x30, 0xc6, 0xd7, 0x95, 0x99, }, + { 0x8a, 0x0f, 0xed, 0xdb, 0xac, 0x86, 0x5a, 0x09, 0xbc, 0xd1, 0x27, 0xfb, 0x56, 0x2e, 0xd6, 0x0a, }, + { 0xb5, 0x5a, 0x0a, 0x5b, 0x51, 0xa1, 0x2a, 0x8b, 0xe3, 0x48, 0x99, 0xc3, 0xe0, 0x47, 0x51, 0x1a, }, + { 0xd9, 0xa0, 0x9c, 0xea, 0x3c, 0xe7, 0x5f, 0xe3, 0x96, 0x98, 0x07, 0x03, 0x17, 0xa7, 0x13, 0x39, }, + { 0x55, 0x22, 0x25, 0xed, 0x11, 0x77, 0xf4, 0x45, 0x84, 0xac, 0x8c, 0xfa, 0x6c, 0x4e, 0xb5, 0xfc, }, + { 0x7e, 0x82, 0xcb, 0xab, 0xfc, 0x95, 0x38, 0x1b, 0x08, 0x09, 0x98, 0x44, 0x21, 0x29, 0xc2, 0xf8, }, + { 0x1f, 0x13, 0x5e, 0xd1, 0x4c, 0xe6, 0x0a, 0x91, 0x36, 0x9d, 0x23, 0x22, 0xbe, 0xf2, 0x5e, 0x3c, }, + { 0x08, 0xb6, 0xbe, 0x45, 0x12, 0x4a, 0x43, 0xe2, 0xeb, 0x77, 0x95, 0x3f, 0x84, 0xdc, 0x85, 0x53, }, + } + }, + + { + { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10 }, + + { + { 0x9a, 0xc7, 0xcc, 0x9a, 0x60, 0x9d, 0x1e, 0xf7, 0xb2, 0x93, 0x28, 0x99, 0xcd, 0xe4, 0x1b, 0x97, }, + { 0x52, 0x48, 0xc4, 0x95, 0x90, 0x14, 0x12, 0x6a, 0x6e, 0x8a, 0x84, 0xf1, 0x1d, 0x1a, 0x9e, 0x1c, }, + { 0x06, 0x59, 0x02, 0xe4, 0xb6, 0x20, 0xf6, 0xcc, 0x36, 0xc8, 0x58, 0x9f, 0x66, 0x43, 0x2f, 0x2b, }, + { 0xd3, 0x9d, 0x56, 0x6b, 0xc6, 0xbc, 0xe3, 0x01, 0x07, 0x68, 0x15, 0x15, 0x49, 0xf3, 0x87, 0x3f, }, + { 0xb6, 0xd1, 0xe6, 0xc4, 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0xe8, 0xcb, 0x99, 0x4b, 0x72, 0x7b, 0x75, 0xbe, 0x31, 0x80, 0x76, 0x9c, }, + { 0xa1, 0xd3, 0x07, 0x8d, 0xfa, 0x91, 0x69, 0x50, 0x3e, 0xd9, 0xd4, 0x49, 0x1d, 0xee, 0x4e, 0xb2, }, + { 0x85, 0x14, 0xa5, 0x49, 0x58, 0x58, 0x09, 0x6f, 0x59, 0x6e, 0x4b, 0xcd, 0x66, 0xb1, 0x06, 0x65, }, + { 0x5f, 0x40, 0xd5, 0x9e, 0xc1, 0xb0, 0x3b, 0x33, 0x73, 0x8e, 0xfa, 0x60, 0xb2, 0x25, 0x5d, 0x31, }, + { 0x34, 0x77, 0xc7, 0xf7, 0x64, 0xa4, 0x1b, 0xac, 0xef, 0xf9, 0x0b, 0xf1, 0x4f, 0x92, 0xb7, 0xcc, }, + { 0xac, 0x4e, 0x95, 0x36, 0x8d, 0x99, 0xb9, 0xeb, 0x78, 0xb8, 0xda, 0x8f, 0x81, 0xff, 0xa7, 0x95, }, + { 0x8c, 0x3c, 0x13, 0xf8, 0xc2, 0x38, 0x8b, 0xb7, 0x3f, 0x38, 0x57, 0x6e, 0x65, 0xb7, 0xc4, 0x46, }, + { 0x13, 0xc4, 0xb9, 0xc1, 0xdf, 0xb6, 0x65, 0x79, 0xed, 0xdd, 0x8a, 0x28, 0x0b, 0x9f, 0x73, 0x16, }, + { 0xdd, 0xd2, 0x78, 0x20, 0x55, 0x01, 0x26, 0x69, 0x8e, 0xfa, 0xad, 0xc6, 0x4b, 0x64, 0xf6, 0x6e, }, + { 0xf0, 0x8f, 0x2e, 0x66, 0xd2, 0x8e, 0xd1, 0x43, 0xf3, 0xa2, 0x37, 0xcf, 0x9d, 0xe7, 0x35, 0x59, }, + { 0x9e, 0xa3, 0x6c, 0x52, 0x55, 0x31, 0xb8, 0x80, 0xba, 0x12, 0x43, 0x34, 0xf5, 0x7b, 0x0b, 0x70, }, + { 0xd5, 0xa3, 0x9e, 0x3d, 0xfc, 0xc5, 0x02, 0x80, 0xba, 0xc4, 0xa6, 0xb5, 0xaa, 0x0d, 0xca, 0x7d, }, + { 0x37, 0x0b, 0x1c, 0x1f, 0xe6, 0x55, 0x91, 0x6d, 0x97, 0xfd, 0x0d, 0x47, 0xca, 0x1d, 0x72, 0xb8, }, + } + }, + }; + + for (size_t i = 0; i < elems (TESTS); ++i) { + const auto &t = TESTS[i]; + + util::crypto::ARC4 gen (t.key.data (), t.key.size ()); + uint8_t data[16]; + size_t consumed = 0; + bool success = true; + + for (size_t j = 0; j < elems (OFFSETS); ++j) { + CHECK_GE (OFFSETS[j], consumed); + + size_t diff = OFFSETS[j] - consumed; + gen.discard (diff); + consumed += diff; + + gen.generate (data, 16); + consumed += 16; + + success = success && std::equal (std::begin (data), std::end (data), std::begin (t.data[j])); + }; + + std::ostringstream os; + os << "ARC4: " << i; + tap.expect (success, os.str ()); + } +}