sha.c File Reference

#include <string.h>
#include "attributes.h"
#include "avutil.h"
#include "bswap.h"
#include "sha.h"
#include "intreadwrite.h"
#include "mem.h"

Go to the source code of this file.

Data Structures
struct	AVSHA
	hash context More...

Macros
#define	rol(value, bits)   (((value) << (bits)) | ((value) >> (32 - (bits))))
#define	blk0(i)   (block[i] = AV_RB32(buffer + 4 * (i)))
#define	blk(i)   (block[i] = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1))
#define	R0(v, w, x, y, z, i)   z += ((w&(x^y))^y) + blk0(i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
#define	R1(v, w, x, y, z, i)   z += ((w&(x^y))^y) + blk (i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
#define	R2(v, w, x, y, z, i)   z += ( w^x ^y) + blk (i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30);
#define	R3(v, w, x, y, z, i)   z += (((w|x)&y)|(w&x)) + blk (i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30);
#define	R4(v, w, x, y, z, i)   z += ( w^x ^y) + blk (i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30);
#define	Ch(x, y, z)   (((x) & ((y) ^ (z))) ^ (z))
#define	Maj(z, y, x)   ((((x) | (y)) & (z)) | ((x) & (y)))
#define	Sigma0_256(x)   (rol((x), 30) ^ rol((x), 19) ^ rol((x), 10))
#define	Sigma1_256(x)   (rol((x), 26) ^ rol((x), 21) ^ rol((x), 7))
#define	sigma0_256(x)   (rol((x), 25) ^ rol((x), 14) ^ ((x) >> 3))
#define	sigma1_256(x)   (rol((x), 15) ^ rol((x), 13) ^ ((x) >> 10))
#define	blk(i)
#define	ROUND256(a, b, c, d, e, f, g, h)
#define	ROUND256_0_TO_15(a, b, c, d, e, f, g, h)
#define	ROUND256_16_TO_63(a, b, c, d, e, f, g, h)

Functions
struct AVSHA *	av_sha_alloc (void)
	Allocate an AVSHA context.
static void	sha1_transform (uint32_t state[5], const uint8_t buffer[64])
static void	sha256_transform (uint32_t *state, const uint8_t buffer[64])
av_cold int	av_sha_init (AVSHA *ctx, int bits)
	Initialize SHA-1 or SHA-2 hashing.
void	av_sha_update (AVSHA *ctx, const uint8_t *data, unsigned int len)
	Update hash value.
void	av_sha_final (AVSHA *ctx, uint8_t *digest)
	Finish hashing and output digest value.

Variables
const int	av_sha_size = sizeof(AVSHA)
static const uint32_t	K256 [64]

Macro Definition Documentation

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

Definition at line 50 of file sha.c.

Referenced by sha1_transform().

#define blk0

(

i

)

(block[i] = AV_RB32(buffer + 4 * (i)))

Definition at line 53 of file sha.c.

Referenced by sha256_transform().

#define blk

(

i

)

(block[i] = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1))

Definition at line 171 of file sha.c.

Referenced by ac3_compute_mantissa_size_c(), ac3_decode_frame(), ac3_exponent_min_c(), aic_decode_slice(), allocate_buffers(), apply_channel_coupling(), apply_mdct(), bink_decode_plane(), binkb_decode_plane(), bit_alloc(), bit_alloc_masking(), compute_exp_strategy(), compute_rematrixing_strategy(), count_exponent_bits(), count_frame_bits(), count_frame_bits_fixed(), count_mantissa_bits_init(), count_mantissa_bits_update_ch(), decode_audio_block(), decode_frame(), decode_transform_coeffs_ch(), dv_calc_mb_coordinates(), dv_init_enc_block(), encode_exponents(), ff_ac3_apply_rematrixing(), ff_ac3_compute_coupling_strategy(), ff_ac3_encode_close(), ff_ac3_group_exponents(), ff_ac3_output_frame(), ff_ac3_quantize_mantissas(), ff_eac3_decode_transform_coeffs_aht_ch(), ff_eac3_output_frame_header(), ff_eac3_parse_header(), ff_eac3_set_cpl_states(), ivi_decode_blocks(), ivi_process_empty_tile(), output_audio_block(), reset_block_bap(), scale_coefficients(), set_bandwidth(), sha256_transform(), and vb_decode_framedata().

#define R0	(		v,
			w,
			x,
			y,
			z,
			i
	)		z += ((w&(x^y))^y) + blk0(i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);

Definition at line 56 of file sha.c.

Referenced by altivec_uyvy_rgb32(), sha1_transform(), and yuv2packedX_altivec().

#define R1	(		v,
			w,
			x,
			y,
			z,
			i
	)		z += ((w&(x^y))^y) + blk (i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);

Definition at line 57 of file sha.c.

Referenced by sha1_transform().

#define R2	(		v,
			w,
			x,
			y,
			z,
			i
	)		z += ( w^x ^y) + blk (i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30);

Definition at line 58 of file sha.c.

Referenced by sha1_transform().

#define R3	(		v,
			w,
			x,
			y,
			z,
			i
	)		z += (((w|x)&y)|(w&x)) + blk (i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30);

Definition at line 59 of file sha.c.

Referenced by sha1_transform().

#define R4	(		v,
			w,
			x,
			y,
			z,
			i
	)		z += ( w^x ^y) + blk (i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30);

Definition at line 60 of file sha.c.

Referenced by sha1_transform().

#define Ch	(		x,
			y,
			z
	)		(((x) & ((y) ^ (z))) ^ (z))

Definition at line 162 of file sha.c.

Referenced by sha256_transform().

#define Maj	(		z,
			y,
			x
	)		((((x) | (y)) & (z)) | ((x) & (y)))

Definition at line 163 of file sha.c.

Referenced by sha256_transform().

#define Sigma0_256

(

x

)

(rol((x), 30) ^ rol((x), 19) ^ rol((x), 10))

Definition at line 165 of file sha.c.

Referenced by sha256_transform().

#define Sigma1_256

(

x

)

(rol((x), 26) ^ rol((x), 21) ^ rol((x), 7))

Definition at line 166 of file sha.c.

Referenced by sha256_transform().

#define sigma0_256

(

x

)

(rol((x), 25) ^ rol((x), 14) ^ ((x) >> 3))

Definition at line 167 of file sha.c.

#define sigma1_256

(

x

)

(rol((x), 15) ^ rol((x), 13) ^ ((x) >> 10))

Definition at line 168 of file sha.c.

#define blk

(

i

)

Value:

(block[i] = block[i - 16] + sigma0_256(block[i - 15]) + \
                            sigma1_256(block[i - 2]) + block[i - 7])

Definition at line 171 of file sha.c.

#define ROUND256	(		a,
			b,
			c,
			d,
			e,
			f,
			g,
			h
	)

Value:

T1 += (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[i]; \
    (d) += T1; \
    (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
    i++

Definition at line 174 of file sha.c.

#define ROUND256_0_TO_15	(		a,
			b,
			c,
			d,
			e,
			f,
			g,
			h
	)

Value:

T1 = blk0(i); \
    ROUND256(a,b,c,d,e,f,g,h)

Definition at line 180 of file sha.c.

Referenced by sha256_transform().

#define ROUND256_16_TO_63	(		a,
			b,
			c,
			d,
			e,
			f,
			g,
			h
	)

Value:

T1 = blk(i); \
    ROUND256(a,b,c,d,e,f,g,h)

Definition at line 184 of file sha.c.

Referenced by sha256_transform().

Function Documentation

static void sha1_transform ( uint32_t  state[5], const uint8_t  buffer[64]  )

static

Definition at line 64 of file sha.c.

Referenced by av_sha_init().

static void sha256_transform ( uint32_t *  state, const uint8_t  buffer[64]  )

static

Definition at line 188 of file sha.c.

Referenced by av_sha_init().

Variable Documentation

const uint32_t K256[64]

static

Initial value:

= {
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
    0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
    0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
    0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
    0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
    0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
    0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
    0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
    0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
}

Definition at line 142 of file sha.c.

Referenced by sha256_transform().