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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- G N A T . S E C U R E _ H A S H E S . S H A 1 --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2002-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides supporting code for implementation of the SHA-1
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33 -- secure hash function as described in FIPS PUB 180-3. The complete text
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34 -- of FIPS PUB 180-3 can be found at:
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35 -- http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
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36
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37 -- This is an internal unit and should not be used directly in applications.
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38 -- Use GNAT.SHA1 instead.
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39
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40 with GNAT.Byte_Swapping;
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41 with Interfaces;
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42
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43 package GNAT.Secure_Hashes.SHA1 is
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44
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45 package Hash_State is new Hash_Function_State
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46 (Word => Interfaces.Unsigned_32,
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47 Swap => GNAT.Byte_Swapping.Swap4,
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48 Hash_Bit_Order => System.High_Order_First);
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49 -- SHA-1 operates on 32-bit big endian words
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50
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51 Block_Words : constant := 16;
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52 -- Messages are processed in chunks of 16 words
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53
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54 procedure Transform
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55 (H : in out Hash_State.State;
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56 M : in out Message_State);
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57 -- Transformation function applied for each block
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58
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59 Initial_State : constant Hash_State.State;
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60 -- Initialization vector
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61
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62 private
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63
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64 Initial_State : constant Hash_State.State :=
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65 (0 => 16#67452301#,
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66 1 => 16#EFCDAB89#,
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67 2 => 16#98BADCFE#,
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68 3 => 16#10325476#,
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69 4 => 16#C3D2E1F0#);
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70 -- Initialization vector from FIPS PUB 180-3
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71
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72 end GNAT.Secure_Hashes.SHA1;
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