sha1.c File Reference

#include "config.h"
#include <isc/assertions.h>
#include <isc/platform.h>
#include <isc/sha1.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/util.h>

Go to the source code of this file.

Data Structures
union	CHAR64LONG16
Defines
#define	rol(value, bits)   (((value) << (bits)) | ((value) >> (32 - (bits))))
#define	blk0(i)
#define	blk(i)
#define	R0(v, w, x, y, z, i)
#define	R1(v, w, x, y, z, i)
#define	R2(v, w, x, y, z, i)
#define	R3(v, w, x, y, z, i)
#define	R4(v, w, x, y, z, i)
Functions
static void	transform (isc_uint32_t state[5], const unsigned char buffer[64])
void	isc_sha1_init (isc_sha1_t *context)
void	isc_sha1_invalidate (isc_sha1_t *context)
void	isc_sha1_update (isc_sha1_t *context, const unsigned char *data, unsigned int len)
void	isc_sha1_final (isc_sha1_t *context, unsigned char *digest)
Variables
static const unsigned char	final_200 = 128
static const unsigned char	final_0 = 0

---

Detailed Description

SHA-1 in C

Author:

By Steve Reid <steve@edmweb.com> 100% Public Domain

 * Test Vectors (from FIPS PUB 180-1)
 * "abc"
 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
 * A million repetitions of "a"
 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
 * 

Definition in file sha1.c.

---

Define Documentation

#define rol	(	value,
		bits		)	(((value) << (bits)) | ((value) >> (32 - (bits))))

Definition at line 132 of file sha1.c.

#define blk0

(

i

)

Value:

(block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) \
         | (rol(block->l[i], 8) & 0x00FF00FF))

blk0() and blk() perform the initial expand. I got the idea of expanding during the round function from SSLeay

Definition at line 140 of file sha1.c.

#define blk

(

i

)

Value:

(block->l[i & 15] = rol(block->l[(i + 13) & 15] \
                                ^ block->l[(i + 8) & 15] \
                                ^ block->l[(i + 2) & 15] \
                                ^ block->l[i & 15], 1))

blk0() and blk() perform the initial expand. I got the idea of expanding during the round function from SSLeay

Definition at line 145 of file sha1.c.

#define R0	(	v,
		w,
		x,
		y,
		z,
		i		)

Value:

z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \
        w = rol(w, 30);

(R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1

Definition at line 156 of file sha1.c.

Referenced by transform().

#define R1	(	v,
		w,
		x,
		y,
		z,
		i		)

Value:

z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
        w = rol(w, 30);

(R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1

Definition at line 159 of file sha1.c.

Referenced by transform().

#define R2	(	v,
		w,
		x,
		y,
		z,
		i		)

Value:

z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
        w = rol(w, 30);

(R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1

Definition at line 162 of file sha1.c.

Referenced by transform().

#define R3	(	v,
		w,
		x,
		y,
		z,
		i		)

Value:

z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
        w = rol(w, 30);

(R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1

Definition at line 165 of file sha1.c.

Referenced by transform().

#define R4	(	v,
		w,
		x,
		y,
		z,
		i		)

Value:

z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
        w = rol(w, 30);

(R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1

Definition at line 168 of file sha1.c.

Referenced by transform().

---

Function Documentation

static void transform	(	isc_uint32_t	state[5],
		const unsigned char	buffer[64]
	)			[static]

Hash a single 512-bit block. This is the core of the algorithm.

Definition at line 252 of file sha1.c.

References block, INSIST, POST, R0, R1, R2, R3, and R4.

void isc_sha1_init

(

isc_sha1_t *

context

)

isc_sha1_init - Initialize new context

Definition at line 317 of file sha1.c.

References isc_sha1_t::count, INSIST, and isc_sha1_t::state.

Referenced by ATF_TC_BODY(), dns_ds_buildrdata(), hmacsha1_fromdns(), isc_entropy_getdata(), isc_hmacsha1_init(), isc_hmacsha1_sign(), and isc_iterated_hash().

void isc_sha1_invalidate

(

isc_sha1_t *

context

)

Definition at line 332 of file sha1.c.

Referenced by isc_hmacsha1_invalidate().

void isc_sha1_update	(	isc_sha1_t *	context,
		const unsigned char *	data,
		unsigned int	len
	)

Run your data through this.

Definition at line 340 of file sha1.c.

References isc_sha1_t::buffer, isc_sha1_t::count, INSIST, isc_sha1_t::state, and transform().

Referenced by ATF_TC_BODY(), dns_ds_buildrdata(), hmacsha1_fromdns(), isc_entropy_getdata(), isc_hmacsha1_init(), isc_hmacsha1_sign(), isc_hmacsha1_update(), isc_iterated_hash(), and isc_sha1_final().

void isc_sha1_final	(	isc_sha1_t *	context,
		unsigned char *	digest
	)

Definition at line 374 of file sha1.c.

References isc_sha1_t::count, INSIST, isc_sha1_update(), and isc_sha1_t::state.

Referenced by ATF_TC_BODY(), dns_ds_buildrdata(), hmacsha1_fromdns(), isc_entropy_getdata(), isc_hmacsha1_init(), isc_hmacsha1_sign(), and isc_iterated_hash().

---

Variable Documentation

const unsigned char final_200 = 128 [static]

Add padding and return the message digest.

Definition at line 370 of file sha1.c.

const unsigned char final_0 = 0 [static]

Definition at line 371 of file sha1.c.

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