sph_sha0.h File Reference

#include <stddef.h>
#include "sph_types.h"

Go to the source code of this file.

Data Structures

struct  sph_sha0_context

Defines

#define SPH_SIZE_sha0   160

Functions

void sph_sha0_init (void *cc)
void sph_sha0 (void *cc, const void *data, size_t len)
void sph_sha0_close (void *cc, void *dst)
void sph_sha0_addbits_and_close (void *cc, unsigned ub, unsigned n, void *dst)
void sph_sha0_comp (const sph_u32 msg[16], sph_u32 val[5])

Detailed Description

SHA-0 interface.

SHA-0 is the current name for the original SHA as published in 1993 in FIPS 180. In 1995, FIPS 180 was withdrawn, and replaced with FIPS 180-1 which describes SHA-1 (which differs from SHA-0 by a one-bit rotation added in the message expansion).

Although the FIPS standards can be found at http://csrc.nist.gov/publications/fips/ , the original FIPS 180 was withdrawn and cannot be found there. The description of SHA-0 can be infered from that of SHA-1 by removing the rotation in the message expansion; test vectors can be used to verify the correctness of this tweak. In particular, this implementation is compatible with the published collision.

Warning:
A collision for SHA-0 has been published. SHA-0 is thus cryptographically broken and should not be used for security purposes.

==========================(LICENSE BEGIN)============================

Copyright (c) 2007-2010 Projet RNRT SAPHIR

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

===========================(LICENSE END)=============================

Author:
Thomas Pornin <thomas.pornin@cryptolog.com>

Define Documentation

#define SPH_SIZE_sha0   160

Output size (in bits) for SHA-0.


Function Documentation

void sph_sha0_init ( void *  cc  ) 

Initialize a SHA-0 context. This process performs no memory allocation.

Parameters:
cc the SHA-0 context (pointer to a sph_sha0_context)
void sph_sha0 ( void *  cc,
const void *  data,
size_t  len 
)

Process some data bytes. It is acceptable that len is zero (in which case this function does nothing).

Parameters:
cc the SHA-0 context
data the input data
len the input data length (in bytes)
void sph_sha0_close ( void *  cc,
void *  dst 
)

Terminate the current SHA-0 computation and output the result into the provided buffer. The destination buffer must be wide enough to accomodate the result (20 bytes). The context is automatically reinitialized.

Parameters:
cc the SHA-0 context
dst the destination buffer
void sph_sha0_addbits_and_close ( void *  cc,
unsigned  ub,
unsigned  n,
void *  dst 
)

Add a few additional bits (0 to 7) to the current computation, then terminate it and output the result in the provided buffer, which must be wide enough to accomodate the result (20 bytes). If bit number i in ub has value 2^i, then the extra bits are those numbered 7 downto 8-n (this is the big-endian convention at the byte level). The context is automatically reinitialized.

Parameters:
cc the SHA-0 context
ub the extra bits
n the number of extra bits (0 to 7)
dst the destination buffer
void sph_sha0_comp ( const sph_u32  msg[16],
sph_u32  val[5] 
)

Apply the SHA-0 compression function on the provided data. The msg parameter contains the 16 32-bit input blocks, as numerical values (hence after the big-endian decoding). The val parameter contains the 5 32-bit input blocks for the compression function; the output is written in place in this array.

Parameters:
msg the message block (16 values)
val the function 160-bit input and output
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