321 lines
9.2 KiB
C++
321 lines
9.2 KiB
C++
/*
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SHA-1 C++ conversion
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original version:
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SHA-1 in C
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By Steve Reid <sreid@sea-to-sky.net>
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100% Public Domain
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changelog at the end of the file.
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*/
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#include <cstdio>
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#include <cstring>
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#include "libtorrent/sha1.hpp"
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#include <boost/detail/endian.hpp> // for BIG_ENDIAN and LITTLE_ENDIAN macros
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typedef boost::uint32_t u32;
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typedef boost::uint8_t u8;
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namespace libtorrent
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{
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namespace
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{
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union CHAR64LONG16
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{
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u8 c[64];
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u32 l[16];
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};
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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#ifdef __clang__
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunused-member-function"
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#endif
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// blk0() and blk() perform the initial expand.
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// I got the idea of expanding during the round function from SSLeay
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struct little_endian_blk0
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{
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static u32 apply(CHAR64LONG16* block, int i)
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{
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return block->l[i] = (rol(block->l[i],24)&0xFF00FF00)
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}
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};
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struct big_endian_blk0
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{
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static u32 apply(CHAR64LONG16* block, int i)
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{
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return block->l[i];
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}
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};
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#ifdef __clang__
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#pragma clang diagnostic pop
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#endif
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#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
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^block->l[(i+2)&15]^block->l[i&15],1))
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// (R0+R1), R2, R3, R4 are the different operations used in SHA1
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#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+BlkFun::apply(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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// Hash a single 512-bit block. This is the core of the algorithm.
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template <class BlkFun>
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void SHA1transform(u32 state[5], u8 const buffer[64])
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{
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using namespace std;
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u32 a, b, c, d, e;
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CHAR64LONG16 workspace;
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CHAR64LONG16* block = &workspace;
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memcpy(block, buffer, 64);
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// Copy context->state[] to working vars
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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// 4 rounds of 20 operations each. Loop unrolled.
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R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
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R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
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R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
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R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
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R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
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R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
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R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
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R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
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R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
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R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
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R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
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R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
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R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
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R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
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R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
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R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
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R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
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R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
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R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
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R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
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// Add the working vars back into context.state[]
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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state[4] += e;
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}
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#ifdef VERBOSE
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void SHAPrintContext(sha_ctx *context, char *msg)
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{
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using namespace std;
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printf("%s (%d,%d) %x %x %x %x %x\n"
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, msg, (unsigned int)context->count[0]
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, (unsigned int)context->count[1]
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, (unsigned int)context->state[0]
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, (unsigned int)context->state[1]
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, (unsigned int)context->state[2]
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, (unsigned int)context->state[3]
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, (unsigned int)context->state[4]);
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}
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#endif
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template <class BlkFun>
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void internal_update(sha_ctx* context, u8 const* data, u32 len)
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{
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using namespace std;
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u32 i, j; // JHB
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#ifdef VERBOSE
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SHAPrintContext(context, "before");
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#endif
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j = (context->count[0] >> 3) & 63;
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if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
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context->count[1] += (len >> 29);
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if ((j + len) > 63)
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{
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memcpy(&context->buffer[j], data, (i = 64-j));
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SHA1transform<BlkFun>(context->state, context->buffer);
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for ( ; i + 63 < len; i += 64)
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{
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SHA1transform<BlkFun>(context->state, &data[i]);
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}
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j = 0;
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}
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else
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{
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i = 0;
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}
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memcpy(&context->buffer[j], &data[i], len - i);
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#ifdef VERBOSE
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SHAPrintContext(context, "after ");
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#endif
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}
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#if !defined BOOST_BIG_ENDIAN && !defined BOOST_LITTLE_ENDIAN
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bool is_big_endian()
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{
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u32 test = 1;
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return *reinterpret_cast<u8*>(&test) == 0;
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}
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#endif
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}
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// SHA1Init - Initialize new context
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void SHA1_init(sha_ctx* context)
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{
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// SHA1 initialization constants
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context->state[0] = 0x67452301;
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context->state[1] = 0xEFCDAB89;
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context->state[2] = 0x98BADCFE;
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context->state[3] = 0x10325476;
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context->state[4] = 0xC3D2E1F0;
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context->count[0] = context->count[1] = 0;
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}
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// Run your data through this.
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void SHA1_update(sha_ctx* context, u8 const* data, u32 len)
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{
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// GCC standard defines for endianness
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// test with: cpp -dM /dev/null
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#if defined BOOST_BIG_ENDIAN
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internal_update<big_endian_blk0>(context, data, len);
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#elif defined BOOST_LITTLE_ENDIAN
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internal_update<little_endian_blk0>(context, data, len);
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#else
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// select different functions depending on endianess
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// and figure out the endianess runtime
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if (is_big_endian())
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internal_update<big_endian_blk0>(context, data, len);
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else
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internal_update<little_endian_blk0>(context, data, len);
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#endif
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}
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// Add padding and return the message digest.
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void SHA1_final(u8* digest, sha_ctx* context)
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{
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u8 finalcount[8];
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for (u32 i = 0; i < 8; ++i)
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{
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// Endian independent
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finalcount[i] = static_cast<u8>(
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(context->count[(i >= 4 ? 0 : 1)]
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>> ((3-(i & 3)) * 8) ) & 255);
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}
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SHA1_update(context, reinterpret_cast<u8 const*>("\200"), 1);
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while ((context->count[0] & 504) != 448)
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SHA1_update(context, reinterpret_cast<u8 const*>("\0"), 1);
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SHA1_update(context, finalcount, 8); // Should cause a SHA1transform()
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for (u32 i = 0; i < 20; ++i)
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{
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digest[i] = static_cast<unsigned char>(
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(context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
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}
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}
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} // libtorrent namespace
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/************************************************************
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-----------------
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Modified 7/98
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By James H. Brown <jbrown@burgoyne.com>
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Still 100% Public Domain
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Corrected a problem which generated improper hash values on 16 bit machines
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Routine SHA1Update changed from
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void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int
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len)
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to
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void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned
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long len)
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The 'len' parameter was declared an int which works fine on 32 bit machines.
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However, on 16 bit machines an int is too small for the shifts being done
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against
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it. This caused the hash function to generate incorrect values if len was
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greater than 8191 (8K - 1) due to the 'len << 3' on line 3 of SHA1Update().
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Since the file IO in main() reads 16K at a time, any file 8K or larger would
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be guaranteed to generate the wrong hash (e.g. Test Vector #3, a million
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"a"s).
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I also changed the declaration of variables i & j in SHA1Update to
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unsigned long from unsigned int for the same reason.
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These changes should make no difference to any 32 bit implementations since
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an
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int and a long are the same size in those environments.
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--
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I also corrected a few compiler warnings generated by Borland C.
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1. Added #include <process.h> for exit() prototype
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2. Removed unused variable 'j' in SHA1Final
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3. Changed exit(0) to return(0) at end of main.
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ALL changes I made can be located by searching for comments containing 'JHB'
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-----------------
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Modified 8/98
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By Steve Reid <sreid@sea-to-sky.net>
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Still 100% public domain
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1- Removed #include <process.h> and used return() instead of exit()
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2- Fixed overwriting of finalcount in SHA1Final() (discovered by Chris Hall)
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3- Changed email address from steve@edmweb.com to sreid@sea-to-sky.net
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-----------------
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Modified 4/01
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By Saul Kravitz <Saul.Kravitz@celera.com>
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Still 100% PD
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Modified to run on Compaq Alpha hardware.
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-----------------
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Converted to C++ 6/04
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By Arvid Norberg <arvidn@sourceforge.net>
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1- made the input buffer const, and made the
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previous SHA1HANDSOFF implicit
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2- uses C99 types with size guarantees
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from boost
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3- if none of BOOST_BIG_ENDIAN or BOOST_LITTLE_ENDIAN
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are defined, endianess is determined
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at runtime. templates are used to duplicate
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the transform function for each endianess
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4- using anonymous namespace to avoid external
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linkage on internal functions
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5- using standard C++ includes
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6- made API compatible with openssl
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still 100% PD
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*/
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/*
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Test Vectors (from FIPS PUB 180-1)
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"abc"
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A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
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"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
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84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
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A million repetitions of "a"
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34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
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*/
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