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// file : libbutl/sha1.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <libbutl/sha1.hxx>
// C interface for sha1c.
//
#include <stdint.h>
#include <stddef.h> // size_t
struct sha1_ctxt {
union {
uint8_t b8[20];
uint32_t b32[5];
} h;
union {
uint8_t b8[8];
uint64_t b64[1];
} c;
union {
uint8_t b8[64];
uint32_t b32[16];
} m;
uint8_t count;
};
typedef struct sha1_ctxt SHA1_CTX;
extern "C"
{
static void sha1_init(struct sha1_ctxt *);
static void sha1_pad(struct sha1_ctxt *);
static void sha1_loop(struct sha1_ctxt *, const uint8_t *, size_t);
static void sha1_result(struct sha1_ctxt *, char[20]);
#include "sha1.c"
}
#define SHA1_Init(x) sha1_init((x))
#define SHA1_Update(x, y, z) sha1_loop((x), (const uint8_t *)(y), (z))
#define SHA1_Final(x, y) sha1_result((y), (char(&)[20])(x))
#include <cassert>
#include <istream>
#include <libbutl/bufstreambuf.hxx>
using namespace std;
namespace butl
{
void sha1::
reset ()
{
SHA1_Init (reinterpret_cast<SHA1_CTX*> (buf_));
done_ = false;
empty_ = true;
}
void sha1::
append (const void* b, size_t n)
{
if (n != 0)
{
SHA1_Update (reinterpret_cast<SHA1_CTX*> (buf_), b, n);
if (empty_)
empty_ = false;
}
}
void sha1::
append (istream& is)
{
bufstreambuf* buf (dynamic_cast<bufstreambuf*> (is.rdbuf ()));
assert (buf != nullptr);
while (is.peek () != istream::traits_type::eof () && is.good ())
{
size_t n (buf->egptr () - buf->gptr ());
append (buf->gptr (), n);
buf->gbump (static_cast<int> (n));
}
}
const sha1::digest_type& sha1::
binary () const
{
if (!done_)
{
SHA1_Final (bin_, reinterpret_cast<SHA1_CTX*> (buf_));
done_ = true;
buf_[0] = '\0'; // Indicate we haven't computed the string yet.
}
return bin_;
}
static const char hex_map[16] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f'};
const char* sha1::
string () const
{
if (!done_)
binary ();
if (buf_[0] == '\0')
{
for (size_t i (0); i != 20; ++i)
{
buf_[i * 2] = hex_map[bin_[i] >> 4];
buf_[i * 2 + 1] = hex_map[bin_[i] & 0x0f];
}
buf_[40] = '\0';
}
return buf_;
}
}
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