Overview
Comment: | Rewrite OFSHA1Hash
The old one was based on a public domain implementation, which is |
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SHA3-256: |
d310aeee302d5cd61d5b543e4509dd84 |
User & Date: | js on 2014-08-31 17:59:31 |
Other Links: | manifest | tags |
Context
2014-09-01
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10:47 | OF{MD5,SHA1}Hash: Zero _buffer when done check-in: 23dc2c7ff8 user: js tags: trunk | |
2014-08-31
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17:59 | Rewrite OFSHA1Hash check-in: d310aeee30 user: js tags: trunk | |
17:59 | Rewrite OFMD5Hash check-in: c4d2f177cb user: js tags: trunk | |
Changes
Modified src/OFSHA1Hash.h from [f14987e748] to [19853167ae].
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20 21 22 23 24 25 26 | * @class OFSHA1Hash OFSHA1Hash.h ObjFW/OFSHA1Hash.h * * @brief A class which provides functions to create an SHA1 hash. */ @interface OFSHA1Hash: OFObject <OFHash> { uint32_t _state[5]; | | > > > | | | | 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | * @class OFSHA1Hash OFSHA1Hash.h ObjFW/OFSHA1Hash.h * * @brief A class which provides functions to create an SHA1 hash. */ @interface OFSHA1Hash: OFObject <OFHash> { uint32_t _state[5]; uint64_t _bits; union { uint8_t bytes[64]; uint32_t words[80]; } _buffer; size_t _bufferLength; bool _calculated; } @end |
Modified src/OFSHA1Hash.m from [8ad65dbc27] to [61d6c59846].
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18 19 20 21 22 23 24 | #include <string.h> #import "OFSHA1Hash.h" #import "OFHashAlreadyCalculatedException.h" | | < | < < < | < | | < < > > | > | < < | < < | < < < < < > < < < < < < < < < | | | < | < < | | | | | > | > > > > > | | < > | | | | | | | | > | < | | | | | | | > > | | | | | | < < < < < < < < < < < < < < < < < < < < < < < < | 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | #include <string.h> #import "OFSHA1Hash.h" #import "OFHashAlreadyCalculatedException.h" #define F(a, b, c, d) ((d) ^ ((b) & ((c) ^ (d)))) #define G(a, b, c, d) ((b) ^ (c) ^ (d)) #define H(a, b, c, d) (((b) & (c)) | ((d) & ((b) | (c)))) #define I(a, b, c, d) ((b) ^ (c) ^ (d)) static void byteSwapVectorIfLE(uint32_t *vector, uint_fast8_t length) { uint_fast8_t i; for (i = 0; i < length; i++) vector[i] = OF_BSWAP32_IF_LE(vector[i]); } static void processBlock(uint32_t *state, uint32_t *buffer) { uint32_t new[5]; uint_fast8_t i; new[0] = state[0]; new[1] = state[1]; new[2] = state[2]; new[3] = state[3]; new[4] = state[4]; byteSwapVectorIfLE(buffer, 16); for (i = 16; i < 80; i++) { uint32_t tmp = buffer[i - 3] ^ buffer[i - 8] ^ buffer[i - 14] ^ buffer[i - 16]; buffer[i] = OF_ROL(tmp, 1); } #define LOOP_BODY(f, k) \ { \ uint32_t tmp = OF_ROL(new[0], 5) + \ f(new[0], new[1], new[2], new[3]) + \ new[4] + k + buffer[i]; \ new[4] = new[3]; \ new[3] = new[2]; \ new[2] = OF_ROL(new[1], 30); \ new[1] = new[0]; \ new[0] = tmp; \ } for (i = 0; i < 20; i++) LOOP_BODY(F, 0x5A827999) for (; i < 40; i++) LOOP_BODY(G, 0x6ED9EBA1) for (; i < 60; i++) LOOP_BODY(H, 0x8F1BBCDC) for (; i < 80; i++) LOOP_BODY(I, 0xCA62C1D6) #undef LOOP_BODY state[0] += new[0]; state[1] += new[1]; state[2] += new[2]; state[3] += new[3]; state[4] += new[4]; } @implementation OFSHA1Hash + (size_t)digestSize { return 20; } |
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151 152 153 154 155 156 157 | _state[2] = 0x98BADCFE; _state[3] = 0x10325476; _state[4] = 0xC3D2E1F0; return self; } | | | < | | > > > > | > > | > > | > > > > > > | > | | | < < | < | < | > | | < < > > > > | | 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | _state[2] = 0x98BADCFE; _state[3] = 0x10325476; _state[4] = 0xC3D2E1F0; return self; } - (void)updateWithBuffer: (const void*)buffer_ length: (size_t)length { const uint8_t *buffer = buffer_; if (_calculated) @throw [OFHashAlreadyCalculatedException exceptionWithHash: self]; _bits += (length * 8); while (length > 0) { size_t min = 64 - _bufferLength; if (min > length) min = length; memcpy(_buffer.bytes + _bufferLength, buffer, min); _bufferLength += min; buffer += min; length -= min; if (_bufferLength == 64) { processBlock(_state, _buffer.words); _bufferLength = 0; } } } - (const uint8_t*)digest { if (_calculated) return (const uint8_t*)_state; _buffer.bytes[_bufferLength] = 0x80; memset(_buffer.bytes + _bufferLength + 1, 0, 64 - _bufferLength - 1); if (_bufferLength >= 56) { processBlock(_state, _buffer.words); memset(_buffer.bytes, 0, 64); } _buffer.words[14] = OF_BSWAP32_IF_LE((uint32_t)(_bits >> 32)); _buffer.words[15] = OF_BSWAP32_IF_LE((uint32_t)(_bits & 0xFFFFFFFF)); processBlock(_state, _buffer.words); byteSwapVectorIfLE(_state, 5); _calculated = true; return (const uint8_t*)_state; } - (bool)isCalculated { return _calculated; } @end |