sha256.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/sha256.h"
#include <string.h>
#include "mbedtls/platform.h"
#include "arc4_alt.h"

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Macros
#define	GET_UINT32_BE(n, b, i)
#define	PUT_UINT32_BE(n, b, i)
#define	SHR(x, n)   ((x & 0xFFFFFFFF) >> n)
#define	ROTR(x, n)   (SHR(x,n) | (x << (32 - n)))
#define	S0(x)   (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
#define	S1(x)   (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
#define	S2(x)   (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
#define	S3(x)   (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
#define	F0(x, y, z)   ((x & y) | (z & (x | y)))
#define	F1(x, y, z)   (z ^ (x & (y ^ z)))
#define	R(t)
#define	P(a, b, c, d, e, f, g, h, x, K)

Functions
void	mbedtls_sha256_init (mbedtls_sha256_context *ctx)
	Initialize SHA-256 context. More...
void	mbedtls_sha256_free (mbedtls_sha256_context *ctx)
	Clear SHA-256 context. More...
void	mbedtls_sha256_clone (mbedtls_sha256_context *dst, const mbedtls_sha256_context *src)
	Clone (the state of) a SHA-256 context. More...
void	mbedtls_sha256_starts (mbedtls_sha256_context *ctx, int is224)
	SHA-256 context setup. More...
void	mbedtls_sha256_process (mbedtls_sha256_context *ctx, const unsigned char data[64])
void	mbedtls_sha256_update (mbedtls_sha256_context *ctx, const unsigned char *input, size_t ilen)
	SHA-256 process buffer. More...
void	mbedtls_sha256_finish (mbedtls_sha256_context *ctx, unsigned char output[32])
	SHA-256 final digest. More...
void	mbedtls_sha256 (const unsigned char *input, size_t ilen, unsigned char output[32], int is224)
	Output = SHA-256( input buffer ) More...
int	mbedtls_sha256_self_test (int verbose)
	Checkup routine. More...

Variables
static const uint32_t	SHA256_K []
static const unsigned char	sha256_padding [64]
static const unsigned char	sha256_test_buf [3][57]
static const int	sha256_test_buflen [3]
static const unsigned char	sha256_test_sum [6][32]

Macro Definition Documentation

F0

#define F0	(		x,
			y,
			z
	)		((x & y) | (z & (x | y)))

F1

#define F1	(		x,
			y,
			z
	)		(z ^ (x & (y ^ z)))

GET_UINT32_BE

#define GET_UINT32_BE	(		n,
			b,
			i
	)

Value:

do {                                                    \
    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
        | ( (uint32_t) (b)[(i) + 3]       );            \
} while( 0 )

P

#define P	(		a,
			b,
			c,
			d,
			e,
			f,
			g,
			h,
			x,
			K
	)

Value:

{                                               \
    temp1 = h + S3(e) + F1(e,f,g) + K + x;      \
    temp2 = S2(a) + F0(a,b,c);                  \
    d += temp1; h = temp1 + temp2;              \
}

PUT_UINT32_BE

#define PUT_UINT32_BE	(		n,
			b,
			i
	)

Value:

do {                                                    \
    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
} while( 0 )

R

#define R

(

t

)

Value:

(                                               \
    W[t] = S1(W[t -  2]) + W[t -  7] +          \
           S0(W[t - 15]) + W[t - 16]            \
)

ROTR

#define ROTR	(		x,
			n
	)		(SHR(x,n) | (x << (32 - n)))

S0

#define S0

(

x

)

(ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))

S1

#define S1

(

x

)

(ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))

S2

#define S2

(

x

)

(ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))

S3

#define S3

(

x

)

(ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))

SHR

#define SHR	(		x,
			n
	)		((x & 0xFFFFFFFF) >> n)

Function Documentation

mbedtls_sha256()

void mbedtls_sha256	(	const unsigned char *	input,
		size_t	ilen,
		unsigned char	output[32],
		int	is224
	)

Output = SHA-256( input buffer )

Parameters

input	buffer holding the data
ilen	length of the input data
output	SHA-224/256 checksum result
is224	0 = use SHA256, 1 = use SHA224

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mbedtls_sha256_clone()

void mbedtls_sha256_clone	(	mbedtls_sha256_context *	dst,
		const mbedtls_sha256_context *	src
	)

Clone (the state of) a SHA-256 context.

Parameters

dst	The destination context
src	The context to be cloned

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mbedtls_sha256_finish()

void mbedtls_sha256_finish	(	mbedtls_sha256_context *	ctx,
		unsigned char	output[32]
	)

SHA-256 final digest.

Parameters

ctx	SHA-256 context
output	SHA-224/256 checksum result

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mbedtls_sha256_free()

void mbedtls_sha256_free

(

mbedtls_sha256_context *

ctx

)

Clear SHA-256 context.

Parameters

ctx	SHA-256 context to be cleared

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mbedtls_sha256_init()

void mbedtls_sha256_init

(

mbedtls_sha256_context *

ctx

)

Initialize SHA-256 context.

Parameters

ctx	SHA-256 context to be initialized

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mbedtls_sha256_process()

void mbedtls_sha256_process	(	mbedtls_sha256_context *	ctx,
		const unsigned char	data[64]
	)

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mbedtls_sha256_self_test()

int mbedtls_sha256_self_test

(

int

verbose

)

Checkup routine.

Returns

0 if successful, or 1 if the test failed

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mbedtls_sha256_starts()

void mbedtls_sha256_starts	(	mbedtls_sha256_context *	ctx,
		int	is224
	)

SHA-256 context setup.

Parameters

ctx	context to be initialized
is224	0 = use SHA256, 1 = use SHA224

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mbedtls_sha256_update()

void mbedtls_sha256_update	(	mbedtls_sha256_context *	ctx,
		const unsigned char *	input,
		size_t	ilen
	)

SHA-256 process buffer.

Parameters

ctx	SHA-256 context
input	buffer holding the data
ilen	length of the input data

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Variable Documentation

SHA256_K

const uint32_t SHA256_K[]

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,
}

sha256_padding

const unsigned char sha256_padding[64]

static

Initial value:

=
{
 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
}

sha256_test_buf

const unsigned char sha256_test_buf[3][57]

static

Initial value:

=
{
    { "abc" },
    { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
    { "" }
}

sha256_test_buflen

const int sha256_test_buflen[3]

static

Initial value:

=
{
    3, 56, 1000
}

sha256_test_sum

const unsigned char sha256_test_sum[6][32]

static

Initial value:

=
{
    
    { 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
      0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
      0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
      0xE3, 0x6C, 0x9D, 0xA7 },
    { 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
      0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
      0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
      0x52, 0x52, 0x25, 0x25 },
    { 0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8,
      0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61, 0x8A, 0x4B,
      0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE,
      0x4E, 0xE7, 0xAD, 0x67 },

    
    { 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
      0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
      0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
      0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD },
    { 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
      0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
      0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
      0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 },
    { 0xCD, 0xC7, 0x6E, 0x5C, 0x99, 0x14, 0xFB, 0x92,
      0x81, 0xA1, 0xC7, 0xE2, 0x84, 0xD7, 0x3E, 0x67,
      0xF1, 0x80, 0x9A, 0x48, 0xA4, 0x97, 0x20, 0x0E,
      0x04, 0x6D, 0x39, 0xCC, 0xC7, 0x11, 0x2C, 0xD0 }
}