sha256.cxx File Reference

#include "sha256.h"
#include <string.h>

Include dependency graph for sha256.cxx:

Go to the source code of this file.

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
static void	mbedtls_zeroize (void *v, size_t n)
void	mbedtls_sha256_init (mbedtls_sha256_context *ctx)
	Initialize SHA-256 context.
void	mbedtls_sha256_free (mbedtls_sha256_context *ctx)
	Clear SHA-256 context.
void	mbedtls_sha256_clone (mbedtls_sha256_context *dst, const mbedtls_sha256_context *src)
	Clone (the state of) a SHA-256 context.
void	mbedtls_sha256_starts (mbedtls_sha256_context *ctx, int is224)
	SHA-256 context setup.
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.
void	mbedtls_sha256_finish (mbedtls_sha256_context *ctx, unsigned char output[32])
	SHA-256 final digest.
void	mbedtls_sha256 (const unsigned char *input, size_t ilen, unsigned char output[32], int is224)
	Output = SHA-256( input buffer )

Variables
static const uint32_t	K []
static const unsigned char	sha256_padding [64]

Macro Definition Documentation

F0

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

Definition at line 165 of file sha256.cxx.

F1

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

Definition at line 166 of file sha256.cxx.

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 )

Definition at line 61 of file sha256.cxx.

   {                                                    \
    (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;              \
}

Definition at line 174 of file sha256.cxx.

{                                               \
    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 )

Definition at line 71 of file sha256.cxx.

   {                                                    \
    (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]            \
)

Definition at line 168 of file sha256.cxx.

ROTR

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

Definition at line 157 of file sha256.cxx.

S0

#define S0

(

x

)

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

Definition at line 159 of file sha256.cxx.

S1

#define S1

(

x

)

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

Definition at line 160 of file sha256.cxx.

S2

#define S2

(

x

)

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

Definition at line 162 of file sha256.cxx.

S3

#define S3

(

x

)

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

Definition at line 163 of file sha256.cxx.

SHR

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

Definition at line 156 of file sha256.cxx.

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

Definition at line 325 of file sha256.cxx.

{
    mbedtls_sha256_context ctx;
 
    mbedtls_sha256_init( &ctx );
    mbedtls_sha256_starts( &ctx, is224 );
    mbedtls_sha256_update( &ctx, input, ilen );
    mbedtls_sha256_finish( &ctx, output );
    mbedtls_sha256_free( &ctx );
}

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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

Definition at line 93 of file sha256.cxx.

{
    *dst = *src;
}

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

Definition at line 289 of file sha256.cxx.

{
    uint32_t last, padn;
    uint32_t high, low;
    unsigned char msglen[8];
 
    high = ( ctx->total[0] >> 29 )
         | ( ctx->total[1] <<  3 );
    low  = ( ctx->total[0] <<  3 );
 
    PUT_UINT32_BE( high, msglen, 0 );
    PUT_UINT32_BE( low,  msglen, 4 );
 
    last = ctx->total[0] & 0x3F;
    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
 
    mbedtls_sha256_update( ctx, sha256_padding, padn );
    mbedtls_sha256_update( ctx, msglen, 8 );
 
    PUT_UINT32_BE( ctx->state[0], output,  0 );
    PUT_UINT32_BE( ctx->state[1], output,  4 );
    PUT_UINT32_BE( ctx->state[2], output,  8 );
    PUT_UINT32_BE( ctx->state[3], output, 12 );
    PUT_UINT32_BE( ctx->state[4], output, 16 );
    PUT_UINT32_BE( ctx->state[5], output, 20 );
    PUT_UINT32_BE( ctx->state[6], output, 24 );
 
    if( ctx->is224 == 0 )
        PUT_UINT32_BE( ctx->state[7], output, 28 );
}

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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

Definition at line 85 of file sha256.cxx.

{
    if( ctx == NULL )
        return;
 
    mbedtls_zeroize( ctx, sizeof( mbedtls_sha256_context ) );
}

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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

Definition at line 80 of file sha256.cxx.

{
    memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
}

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mbedtls_sha256_process()

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

Definition at line 181 of file sha256.cxx.

{
    uint32_t temp1, temp2, W[64];
    uint32_t A[8];
    unsigned int i;
 
    for( i = 0; i < 8; i++ )
        A[i] = ctx->state[i];
 
#if defined(MBEDTLS_SHA256_SMALLER)
    for( i = 0; i < 64; i++ )
    {
        if( i < 16 )
            GET_UINT32_BE( W[i], data, 4 * i );
        else
            R( i );
 
        P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] );
 
        temp1 = A[7]; A[7] = A[6]; A[6] = A[5]; A[5] = A[4]; A[4] = A[3];
        A[3] = A[2]; A[2] = A[1]; A[1] = A[0]; A[0] = temp1;
    }
#else /* MBEDTLS_SHA256_SMALLER */
    for( i = 0; i < 16; i++ )
        GET_UINT32_BE( W[i], data, 4 * i );
 
    for( i = 0; i < 16; i += 8 )
    {
        P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i+0], K[i+0] );
        P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i+1], K[i+1] );
        P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i+2], K[i+2] );
        P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i+3], K[i+3] );
        P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i+4], K[i+4] );
        P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i+5], K[i+5] );
        P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i+6], K[i+6] );
        P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i+7], K[i+7] );
    }
 
    for( i = 16; i < 64; i += 8 )
    {
        P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], R(i+0), K[i+0] );
        P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], R(i+1), K[i+1] );
        P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], R(i+2), K[i+2] );
        P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], R(i+3), K[i+3] );
        P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], R(i+4), K[i+4] );
        P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], R(i+5), K[i+5] );
        P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], R(i+6), K[i+6] );
        P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], R(i+7), K[i+7] );
    }
#endif /* MBEDTLS_SHA256_SMALLER */
 
    for( i = 0; i < 8; i++ )
        ctx->state[i] += A[i];
}

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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

Definition at line 102 of file sha256.cxx.

{
    ctx->total[0] = 0;
    ctx->total[1] = 0;
 
    if( is224 == 0 )
    {
        /* SHA-256 */
        ctx->state[0] = 0x6A09E667;
        ctx->state[1] = 0xBB67AE85;
        ctx->state[2] = 0x3C6EF372;
        ctx->state[3] = 0xA54FF53A;
        ctx->state[4] = 0x510E527F;
        ctx->state[5] = 0x9B05688C;
        ctx->state[6] = 0x1F83D9AB;
        ctx->state[7] = 0x5BE0CD19;
    }
    else
    {
        /* SHA-224 */
        ctx->state[0] = 0xC1059ED8;
        ctx->state[1] = 0x367CD507;
        ctx->state[2] = 0x3070DD17;
        ctx->state[3] = 0xF70E5939;
        ctx->state[4] = 0xFFC00B31;
        ctx->state[5] = 0x68581511;
        ctx->state[6] = 0x64F98FA7;
        ctx->state[7] = 0xBEFA4FA4;
    }
 
    ctx->is224 = is224;
}

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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

Definition at line 240 of file sha256.cxx.

{
    size_t fill;
    uint32_t left;
 
    if( ilen == 0 )
        return;
 
    left = ctx->total[0] & 0x3F;
    fill = 64 - left;
 
    ctx->total[0] += (uint32_t) ilen;
    ctx->total[0] &= 0xFFFFFFFF;
 
    if( ctx->total[0] < (uint32_t) ilen )
        ctx->total[1]++;
 
    if( left && ilen >= fill )
    {
        memcpy( (void *) (ctx->buffer + left), input, fill );
        mbedtls_sha256_process( ctx, ctx->buffer );
        input += fill;
        ilen  -= fill;
        left = 0;
    }
 
    while( ilen >= 64 )
    {
        mbedtls_sha256_process( ctx, input );
        input += 64;
        ilen  -= 64;
    }
 
    if( ilen > 0 )
        memcpy( (void *) (ctx->buffer + left), input, ilen );
}

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mbedtls_zeroize()

static void mbedtls_zeroize ( void *  v, size_t  n  )

static

Definition at line 51 of file sha256.cxx.

                                                 {
   volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
}

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Variable Documentation

K

const uint32_t 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,
}

Definition at line 136 of file sha256.cxx.

{
    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
}

Definition at line 278 of file sha256.cxx.

{
 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
};