sha2.c File Reference

#include <config.h>
#include <string.h>
#include <assert.h>
#include "sha2.h"

Include dependency graph for sha2.c:

Go to the source code of this file.

Macros
#define	SHA256_SHORT_BLOCK_LENGTH   (SHA256_BLOCK_LENGTH - 8)
#define	SHA384_SHORT_BLOCK_LENGTH   (SHA384_BLOCK_LENGTH - 16)
#define	SHA512_SHORT_BLOCK_LENGTH   (SHA512_BLOCK_LENGTH - 16)
#define	SHA2_WORD64_CONST(dw1, dw2)   (((sha2_word64)(dw1) << 32) | (dw2))
#define	REVERSE32(w, x)
#define	REVERSE64(w, x)
#define	ADDINC128(w, n)
#define	SHA2_USE_MEMSET_MEMCPY   1
#define	MEMSET_BZERO(p, l)   memset((p), 0, (l))
#define	MEMCPY_BCOPY(d, s, l)   memcpy((d), (s), (l))
#define	R(b, x)   ((x) >> (b))
#define	S32(b, x)   (((x) >> (b)) | ((x) << (32 - (b))))
#define	S64(b, x)   (((x) >> (b)) | ((x) << (64 - (b))))
#define	Ch(x, y, z)   (((x) & (y)) ^ ((~(x)) & (z)))
#define	Maj(x, y, z)   (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define	Sigma0_256(x)   (S32(2, (x)) ^ S32(13, (x)) ^ S32(22, (x)))
#define	Sigma1_256(x)   (S32(6, (x)) ^ S32(11, (x)) ^ S32(25, (x)))
#define	sigma0_256(x)   (S32(7, (x)) ^ S32(18, (x)) ^ R(3 , (x)))
#define	sigma1_256(x)   (S32(17, (x)) ^ S32(19, (x)) ^ R(10, (x)))
#define	Sigma0_512(x)   (S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
#define	Sigma1_512(x)   (S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
#define	sigma0_512(x)   (S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7, (x)))
#define	sigma1_512(x)   (S64(19, (x)) ^ S64(61, (x)) ^ R( 6, (x)))

Functions
void	SHA512_Last (SHA512_CTX *)
void	SHA256_Transform (SHA256_CTX *, const sha2_word32 *)
void	SHA512_Transform (SHA512_CTX *, const sha2_word64 *)
void	SHA256_Init (SHA256_CTX *context)
void	SHA256_Update (SHA256_CTX *context, const sha2_byte *data, size_t len)
void	SHA256_Final (sha2_byte digest[], SHA256_CTX *context)
char *	SHA256_End (SHA256_CTX *context, char buffer[])
char *	SHA256_Data (const sha2_byte *data, size_t len, char digest[SHA256_DIGEST_STRING_LENGTH])
void	SHA512_Init (SHA512_CTX *context)
void	SHA512_Update (SHA512_CTX *context, const sha2_byte *data, size_t len)
void	SHA512_Final (sha2_byte digest[], SHA512_CTX *context)
char *	SHA512_End (SHA512_CTX *context, char buffer[])
char *	SHA512_Data (const sha2_byte *data, size_t len, char digest[SHA512_DIGEST_STRING_LENGTH])
void	SHA384_Init (SHA384_CTX *context)
void	SHA384_Update (SHA384_CTX *context, const sha2_byte *data, size_t len)
void	SHA384_Final (sha2_byte digest[], SHA384_CTX *context)
char *	SHA384_End (SHA384_CTX *context, char buffer[])
char *	SHA384_Data (const sha2_byte *data, size_t len, char digest[SHA384_DIGEST_STRING_LENGTH])

Variables
static const sha2_word32	K256 [64]
static const sha2_word32	sha256_initial_hash_value [8]
static const sha2_word64	K512 [80]
static const sha2_word64	sha384_initial_hash_value [8]
static const sha2_word64	sha512_initial_hash_value [8]
static const char	sha2_hex_digits [] = "0123456789abcdef"

Macro Definition Documentation

ADDINC128

#define ADDINC128	(		w,
			n
	)

Value:

    { \
    (w)[0] += (sha2_word64)(n); \
    if ((w)[0] < (n)) { \
        (w)[1]++; \
    } \
}

Definition at line 89 of file sha2.c.

Ch

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

Definition at line 141 of file sha2.c.

Maj

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

Definition at line 142 of file sha2.c.

MEMCPY_BCOPY

#define MEMCPY_BCOPY	(		d,
			s,
			l
	)		memcpy((d), (s), (l))

Definition at line 116 of file sha2.c.

MEMSET_BZERO

#define MEMSET_BZERO	(		p,
			l
	)		memset((p), 0, (l))

Definition at line 115 of file sha2.c.

R

#define R	(		b,
			x
	)		((x) >> (b))

Definition at line 134 of file sha2.c.

REVERSE32

#define REVERSE32	(		w,
			x
	)

Value:

    { \
    sha2_word32 tmp = (w); \
    tmp = (tmp >> 16) | (tmp << 16); \
    (x) = ((tmp & 0xff00ff00) >> 8) | ((tmp & 0x00ff00ff) << 8); \
}

Definition at line 69 of file sha2.c.

REVERSE64

#define REVERSE64	(		w,
			x
	)

Value:

    { \
    sha2_word64 tmp = (w); \
    tmp = (tmp >> 32) | (tmp << 32); \
    tmp = ((tmp & SHA2_WORD64_CONST(0xff00ff00, 0xff00ff00)) >> 8) | \
          ((tmp & SHA2_WORD64_CONST(0x00ff00ff, 0x00ff00ff)) << 8); \
    (x) = ((tmp & SHA2_WORD64_CONST(0xffff0000, 0xffff0000)) >> 16) | \
          ((tmp & SHA2_WORD64_CONST(0x0000ffff, 0x0000ffff)) << 16); \
}

Definition at line 74 of file sha2.c.

S32

#define S32	(		b,
			x
	)		(((x) >> (b)) | ((x) << (32 - (b))))

Definition at line 136 of file sha2.c.

S64

#define S64	(		b,
			x
	)		(((x) >> (b)) | ((x) << (64 - (b))))

Definition at line 138 of file sha2.c.

SHA256_SHORT_BLOCK_LENGTH

#define SHA256_SHORT_BLOCK_LENGTH   (SHA256_BLOCK_LENGTH - 8)

Definition at line 61 of file sha2.c.

SHA2_USE_MEMSET_MEMCPY

#define SHA2_USE_MEMSET_MEMCPY   1

Definition at line 107 of file sha2.c.

SHA2_WORD64_CONST

#define SHA2_WORD64_CONST	(		dw1,
			dw2
	)		(((sha2_word64)(dw1) << 32) | (dw2))

Definition at line 65 of file sha2.c.

SHA384_SHORT_BLOCK_LENGTH

#define SHA384_SHORT_BLOCK_LENGTH   (SHA384_BLOCK_LENGTH - 16)

Definition at line 62 of file sha2.c.

SHA512_SHORT_BLOCK_LENGTH

#define SHA512_SHORT_BLOCK_LENGTH   (SHA512_BLOCK_LENGTH - 16)

Definition at line 63 of file sha2.c.

Sigma0_256

#define Sigma0_256

(

x

)

(S32(2, (x)) ^ S32(13, (x)) ^ S32(22, (x)))

Definition at line 145 of file sha2.c.

sigma0_256

#define sigma0_256

(

x

)

(S32(7, (x)) ^ S32(18, (x)) ^ R(3 , (x)))

Definition at line 147 of file sha2.c.

Sigma0_512

#define Sigma0_512

(

x

)

(S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))

Definition at line 151 of file sha2.c.

sigma0_512

#define sigma0_512

(

x

)

(S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7, (x)))

Definition at line 153 of file sha2.c.

Sigma1_256

#define Sigma1_256

(

x

)

(S32(6, (x)) ^ S32(11, (x)) ^ S32(25, (x)))

Definition at line 146 of file sha2.c.

sigma1_256

#define sigma1_256

(

x

)

(S32(17, (x)) ^ S32(19, (x)) ^ R(10, (x)))

Definition at line 148 of file sha2.c.

Sigma1_512

#define Sigma1_512

(

x

)

(S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))

Definition at line 152 of file sha2.c.

sigma1_512

#define sigma1_512

(

x

)

(S64(19, (x)) ^ S64(61, (x)) ^ R( 6, (x)))

Definition at line 154 of file sha2.c.

Function Documentation

SHA256_Data()

char * SHA256_Data	(	const sha2_byte *	data,
		size_t	len,
		char	digest[SHA256_DIGEST_STRING_LENGTH]
	)

Definition at line 593 of file sha2.c.

                                                                                               {
    SHA256_CTX  context;
 
    SHA256_Init(&context);
    SHA256_Update(&context, data, len);
    return SHA256_End(&context, digest);
}

SHA256_End()

char * SHA256_End	(	SHA256_CTX *	context,
		char	buffer[]
	)

Definition at line 570 of file sha2.c.

                                                     {
    sha2_byte   digest[SHA256_DIGEST_LENGTH], *d = digest;
    int     i;
 
    /* Sanity check: */
    assert(context != NULL);
 
    if (buffer != NULL) {
        SHA256_Final(digest, context);
 
        for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
            *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
            *buffer++ = sha2_hex_digits[*d & 0x0f];
            d++;
        }
        *buffer = 0;
    } else {
        MEMSET_BZERO(context, sizeof(*context));
    }
    MEMSET_BZERO(digest, SHA256_DIGEST_LENGTH);
    return buffer;
}

Referenced by SHA256_Data().

SHA256_Final()

void SHA256_Final	(	sha2_byte	digest[],
		SHA256_CTX *	context
	)

Definition at line 507 of file sha2.c.

                                                           {
    sha2_word32 *d = (sha2_word32*)digest;
    unsigned int    usedspace;
 
    /* Sanity check: */
    assert(context != NULL);
 
    /* If no digest buffer is passed, we don't bother doing this: */
    if (digest != NULL) {
        usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
#ifndef WORDS_BIGENDIAN
        /* Convert FROM host byte order */
        REVERSE64(context->bitcount,context->bitcount);
#endif
        if (usedspace > 0) {
            /* Begin padding with a 1 bit: */
            context->buffer[usedspace++] = 0x80;
 
            if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
                /* Set-up for the last transform: */
                MEMSET_BZERO(&context->buffer[usedspace], SHA256_SHORT_BLOCK_LENGTH - usedspace);
            } else {
                if (usedspace < SHA256_BLOCK_LENGTH) {
                    MEMSET_BZERO(&context->buffer[usedspace], SHA256_BLOCK_LENGTH - usedspace);
                }
                /* Do second-to-last transform: */
                SHA256_Transform(context, (sha2_word32*)context->buffer);
 
                /* And set-up for the last transform: */
                MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
            }
        } else {
            /* Set-up for the last transform: */
            MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
 
            /* Begin padding with a 1 bit: */
            *context->buffer = 0x80;
        }
        /* Set the bit count: */
        *(sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;
 
        /* Final transform: */
        SHA256_Transform(context, (sha2_word32*)context->buffer);
 
#ifndef WORDS_BIGENDIAN
        {
            /* Convert TO host byte order */
            int j;
            for (j = 0; j < 8; j++) {
                REVERSE32(context->state[j],context->state[j]);
                *d++ = context->state[j];
            }
        }
#else
        MEMCPY_BCOPY(d, context->state, SHA256_DIGEST_LENGTH);
#endif
    }
 
    /* Clean up state data: */
    MEMSET_BZERO(context, sizeof(*context));
    usedspace = 0;
}

Referenced by finalize_hash_impl(), and SHA256_End().

SHA256_Init()

void SHA256_Init

(

SHA256_CTX *

context

)

Definition at line 275 of file sha2.c.

                                      {
    if (context == NULL) {
        return;
    }
    MEMCPY_BCOPY(context->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
    MEMSET_BZERO(context->buffer, SHA256_BLOCK_LENGTH);
    context->bitcount = 0;
}

Referenced by init_hash_impl(), and SHA256_Data().

SHA256_Transform()

void SHA256_Transform	(	SHA256_CTX *	context,
		const sha2_word32 *	data
	)

Definition at line 379 of file sha2.c.

                                                                    {
    sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
    sha2_word32 T1, T2, *W256;
    int     j;
 
    W256 = (sha2_word32*)context->buffer;
 
    /* Initialize registers with the prev. intermediate value */
    a = context->state[0];
    b = context->state[1];
    c = context->state[2];
    d = context->state[3];
    e = context->state[4];
    f = context->state[5];
    g = context->state[6];
    h = context->state[7];
 
    j = 0;
    do {
#ifndef WORDS_BIGENDIAN
        /* Copy data while converting to host byte order */
        REVERSE32(*data++,W256[j]);
        /* Apply the SHA-256 compression function to update a..h */
        T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
#else
        /* Apply the SHA-256 compression function to update a..h with copy */
        T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + (W256[j] = *data++);
#endif
        T2 = Sigma0_256(a) + Maj(a, b, c);
        h = g;
        g = f;
        f = e;
        e = d + T1;
        d = c;
        c = b;
        b = a;
        a = T1 + T2;
 
        j++;
    } while (j < 16);
 
    do {
        /* Part of the message block expansion: */
        s0 = W256[(j+1)&0x0f];
        s0 = sigma0_256(s0);
        s1 = W256[(j+14)&0x0f];
        s1 = sigma1_256(s1);
 
        /* Apply the SHA-256 compression function to update a..h */
        T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
             (W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
        T2 = Sigma0_256(a) + Maj(a, b, c);
        h = g;
        g = f;
        f = e;
        e = d + T1;
        d = c;
        c = b;
        b = a;
        a = T1 + T2;
 
        j++;
    } while (j < 64);
 
    /* Compute the current intermediate hash value */
    context->state[0] += a;
    context->state[1] += b;
    context->state[2] += c;
    context->state[3] += d;
    context->state[4] += e;
    context->state[5] += f;
    context->state[6] += g;
    context->state[7] += h;
 
    /* Clean up */
    a = b = c = d = e = f = g = h = T1 = T2 = 0;
}

Referenced by SHA256_Final(), and SHA256_Update().

SHA256_Update()

void SHA256_Update	(	SHA256_CTX *	context,
		const sha2_byte *	data,
		size_t	len
	)

Definition at line 459 of file sha2.c.

                                                                           {
    unsigned int    freespace, usedspace;
 
    if (len == 0) {
        /* Calling with no data is valid - we do nothing */
        return;
    }
 
    /* Sanity check: */
    assert(context != NULL && data != NULL);
 
    usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
    if (usedspace > 0) {
        /* Calculate how much free space is available in the buffer */
        freespace = SHA256_BLOCK_LENGTH - usedspace;
 
        if (len >= freespace) {
            /* Fill the buffer completely and process it */
            MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
            context->bitcount += freespace << 3;
            len -= freespace;
            data += freespace;
            SHA256_Transform(context, (sha2_word32*)context->buffer);
        } else {
            /* The buffer is not yet full */
            MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
            context->bitcount += len << 3;
            /* Clean up: */
            usedspace = freespace = 0;
            return;
        }
    }
    while (len >= SHA256_BLOCK_LENGTH) {
        /* Process as many complete blocks as we can */
        SHA256_Transform(context, (const sha2_word32*)data);
        context->bitcount += SHA256_BLOCK_LENGTH << 3;
        len -= SHA256_BLOCK_LENGTH;
        data += SHA256_BLOCK_LENGTH;
    }
    if (len > 0) {
        /* There's left-overs, so save 'em */
        MEMCPY_BCOPY(context->buffer, data, len);
        context->bitcount += len << 3;
    }
    /* Clean up: */
    usedspace = freespace = 0;
}

Referenced by SHA256_Data(), and update_hash_impl().

SHA384_Data()

char * SHA384_Data	(	const sha2_byte *	data,
		size_t	len,
		char	digest[SHA384_DIGEST_STRING_LENGTH]
	)

Definition at line 997 of file sha2.c.

                                                                                               {
    SHA384_CTX  context;
 
    SHA384_Init(&context);
    SHA384_Update(&context, data, len);
    return SHA384_End(&context, digest);
}

SHA384_End()

char * SHA384_End	(	SHA384_CTX *	context,
		char	buffer[]
	)

Definition at line 974 of file sha2.c.

                                                     {
    sha2_byte   digest[SHA384_DIGEST_LENGTH], *d = digest;
    int     i;
 
    /* Sanity check: */
    assert(context != NULL);
 
    if (buffer != NULL) {
        SHA384_Final(digest, context);
 
        for (i = 0; i < SHA384_DIGEST_LENGTH; i++) {
            *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
            *buffer++ = sha2_hex_digits[*d & 0x0f];
            d++;
        }
        *buffer = 0;
    } else {
        MEMSET_BZERO(context, sizeof(*context));
    }
    MEMSET_BZERO(digest, SHA384_DIGEST_LENGTH);
    return buffer;
}

Referenced by SHA384_Data().

SHA384_Final()

void SHA384_Final	(	sha2_byte	digest[],
		SHA384_CTX *	context
	)

Definition at line 945 of file sha2.c.

                                                           {
    sha2_word64 *d = (sha2_word64*)digest;
 
    /* Sanity check: */
    assert(context != NULL);
 
    /* If no digest buffer is passed, we don't bother doing this: */
    if (digest != NULL) {
        SHA512_Last((SHA512_CTX*)context);
 
        /* Save the hash data for output: */
#ifndef WORDS_BIGENDIAN
        {
            /* Convert TO host byte order */
            int j;
            for (j = 0; j < 6; j++) {
                REVERSE64(context->state[j],context->state[j]);
                *d++ = context->state[j];
            }
        }
#else
        MEMCPY_BCOPY(d, context->state, SHA384_DIGEST_LENGTH);
#endif
    }
 
    /* Zero out state data */
    MEMSET_BZERO(context, sizeof(*context));
}

Referenced by finalize_hash_impl(), and SHA384_End().

SHA384_Init()

void SHA384_Init

(

SHA384_CTX *

context

)

Definition at line 932 of file sha2.c.

                                      {
    if (context == NULL) {
        return;
    }
    MEMCPY_BCOPY(context->state, sha384_initial_hash_value, SHA512_DIGEST_LENGTH);
    MEMSET_BZERO(context->buffer, SHA384_BLOCK_LENGTH);
    context->bitcount[0] = context->bitcount[1] = 0;
}

Referenced by init_hash_impl(), and SHA384_Data().

SHA384_Update()

void SHA384_Update	(	SHA384_CTX *	context,
		const sha2_byte *	data,
		size_t	len
	)

Definition at line 941 of file sha2.c.

                                                                           {
    SHA512_Update((SHA512_CTX*)context, data, len);
}

Referenced by SHA384_Data(), and update_hash_impl().

SHA512_Data()

char * SHA512_Data	(	const sha2_byte *	data,
		size_t	len,
		char	digest[SHA512_DIGEST_STRING_LENGTH]
	)

Definition at line 922 of file sha2.c.

                                                                                               {
    SHA512_CTX  context;
 
    SHA512_Init(&context);
    SHA512_Update(&context, data, len);
    return SHA512_End(&context, digest);
}

SHA512_End()

char * SHA512_End	(	SHA512_CTX *	context,
		char	buffer[]
	)

Definition at line 899 of file sha2.c.

                                                     {
    sha2_byte   digest[SHA512_DIGEST_LENGTH], *d = digest;
    int     i;
 
    /* Sanity check: */
    assert(context != NULL);
 
    if (buffer != NULL) {
        SHA512_Final(digest, context);
 
        for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
            *buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
            *buffer++ = sha2_hex_digits[*d & 0x0f];
            d++;
        }
        *buffer = 0;
    } else {
        MEMSET_BZERO(context, sizeof(*context));
    }
    MEMSET_BZERO(digest, SHA512_DIGEST_LENGTH);
    return buffer;
}

Referenced by SHA512_Data().

SHA512_Final()

void SHA512_Final	(	sha2_byte	digest[],
		SHA512_CTX *	context
	)

Definition at line 870 of file sha2.c.

                                                           {
    sha2_word64 *d = (sha2_word64*)digest;
 
    /* Sanity check: */
    assert(context != NULL);
 
    /* If no digest buffer is passed, we don't bother doing this: */
    if (digest != NULL) {
        SHA512_Last(context);
 
        /* Save the hash data for output: */
#ifndef WORDS_BIGENDIAN
        {
            /* Convert TO host byte order */
            int j;
            for (j = 0; j < 8; j++) {
                REVERSE64(context->state[j],context->state[j]);
                *d++ = context->state[j];
            }
        }
#else
        MEMCPY_BCOPY(d, context->state, SHA512_DIGEST_LENGTH);
#endif
    }
 
    /* Zero out state data */
    MEMSET_BZERO(context, sizeof(*context));
}

Referenced by finalize_hash_impl(), and SHA512_End().

SHA512_Init()

void SHA512_Init

(

SHA512_CTX *

context

)

Definition at line 603 of file sha2.c.

                                      {
    if (context == NULL) {
        return;
    }
    MEMCPY_BCOPY(context->state, sha512_initial_hash_value, SHA512_DIGEST_LENGTH);
    MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH);
    context->bitcount[0] = context->bitcount[1] =  0;
}

Referenced by init_hash_impl(), and SHA512_Data().

SHA512_Last()

void SHA512_Last

(

SHA512_CTX *

context

)

Definition at line 829 of file sha2.c.

                                      {
    unsigned int    usedspace;
 
    usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
#ifndef WORDS_BIGENDIAN
    /* Convert FROM host byte order */
    REVERSE64(context->bitcount[0],context->bitcount[0]);
    REVERSE64(context->bitcount[1],context->bitcount[1]);
#endif
    if (usedspace > 0) {
        /* Begin padding with a 1 bit: */
        context->buffer[usedspace++] = 0x80;
 
        if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
            /* Set-up for the last transform: */
            MEMSET_BZERO(&context->buffer[usedspace], SHA512_SHORT_BLOCK_LENGTH - usedspace);
        } else {
            if (usedspace < SHA512_BLOCK_LENGTH) {
                MEMSET_BZERO(&context->buffer[usedspace], SHA512_BLOCK_LENGTH - usedspace);
            }
            /* Do second-to-last transform: */
            SHA512_Transform(context, (sha2_word64*)context->buffer);
 
            /* And set-up for the last transform: */
            MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH - 2);
        }
    } else {
        /* Prepare for final transform: */
        MEMSET_BZERO(context->buffer, SHA512_SHORT_BLOCK_LENGTH);
 
        /* Begin padding with a 1 bit: */
        *context->buffer = 0x80;
    }
    /* Store the length of input data (in bits): */
    *(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
    *(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];
 
    /* Final transform: */
    SHA512_Transform(context, (sha2_word64*)context->buffer);
}

Referenced by SHA384_Final(), and SHA512_Final().

SHA512_Transform()

void SHA512_Transform	(	SHA512_CTX *	context,
		const sha2_word64 *	data
	)

Definition at line 703 of file sha2.c.

                                                                    {
    sha2_word64 a, b, c, d, e, f, g, h, s0, s1;
    sha2_word64 T1, T2, *W512 = (sha2_word64*)context->buffer;
    int     j;
 
    /* Initialize registers with the prev. intermediate value */
    a = context->state[0];
    b = context->state[1];
    c = context->state[2];
    d = context->state[3];
    e = context->state[4];
    f = context->state[5];
    g = context->state[6];
    h = context->state[7];
 
    j = 0;
    do {
#ifndef WORDS_BIGENDIAN
        /* Convert TO host byte order */
        REVERSE64(*data++, W512[j]);
        /* Apply the SHA-512 compression function to update a..h */
        T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
#else
        /* Apply the SHA-512 compression function to update a..h with copy */
        T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + (W512[j] = *data++);
#endif
        T2 = Sigma0_512(a) + Maj(a, b, c);
        h = g;
        g = f;
        f = e;
        e = d + T1;
        d = c;
        c = b;
        b = a;
        a = T1 + T2;
 
        j++;
    } while (j < 16);
 
    do {
        /* Part of the message block expansion: */
        s0 = W512[(j+1)&0x0f];
        s0 = sigma0_512(s0);
        s1 = W512[(j+14)&0x0f];
        s1 =  sigma1_512(s1);
 
        /* Apply the SHA-512 compression function to update a..h */
        T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
             (W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
        T2 = Sigma0_512(a) + Maj(a, b, c);
        h = g;
        g = f;
        f = e;
        e = d + T1;
        d = c;
        c = b;
        b = a;
        a = T1 + T2;
 
        j++;
    } while (j < 80);
 
    /* Compute the current intermediate hash value */
    context->state[0] += a;
    context->state[1] += b;
    context->state[2] += c;
    context->state[3] += d;
    context->state[4] += e;
    context->state[5] += f;
    context->state[6] += g;
    context->state[7] += h;
 
    /* Clean up */
    a = b = c = d = e = f = g = h = T1 = T2 = 0;
}

Referenced by SHA512_Last(), and SHA512_Update().

SHA512_Update()

void SHA512_Update	(	SHA512_CTX *	context,
		const sha2_byte *	data,
		size_t	len
	)

Definition at line 781 of file sha2.c.

                                                                           {
    unsigned int    freespace, usedspace;
 
    if (len == 0) {
        /* Calling with no data is valid - we do nothing */
        return;
    }
 
    /* Sanity check: */
    assert(context != NULL && data != NULL);
 
    usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
    if (usedspace > 0) {
        /* Calculate how much free space is available in the buffer */
        freespace = SHA512_BLOCK_LENGTH - usedspace;
 
        if (len >= freespace) {
            /* Fill the buffer completely and process it */
            MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
            ADDINC128(context->bitcount, freespace << 3);
            len -= freespace;
            data += freespace;
            SHA512_Transform(context, (sha2_word64*)context->buffer);
        } else {
            /* The buffer is not yet full */
            MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
            ADDINC128(context->bitcount, len << 3);
            /* Clean up: */
            usedspace = freespace = 0;
            return;
        }
    }
    while (len >= SHA512_BLOCK_LENGTH) {
        /* Process as many complete blocks as we can */
        SHA512_Transform(context, (const sha2_word64*)data);
        ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
        len -= SHA512_BLOCK_LENGTH;
        data += SHA512_BLOCK_LENGTH;
    }
    if (len > 0) {
        /* There's left-overs, so save 'em */
        MEMCPY_BCOPY(context->buffer, data, len);
        ADDINC128(context->bitcount, len << 3);
    }
    /* Clean up: */
    usedspace = freespace = 0;
}

Referenced by SHA384_Update(), SHA512_Data(), and update_hash_impl().

Variable Documentation

K256

const sha2_word32 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 168 of file sha2.c.

Referenced by SHA256_Transform().

K512

const sha2_word64 K512[80]

static

Definition at line 200 of file sha2.c.

Referenced by SHA512_Transform().

sha256_initial_hash_value

const sha2_word32 sha256_initial_hash_value[8]

static

Initial value:

= {
    0x6a09e667,
    0xbb67ae85,
    0x3c6ef372,
    0xa54ff53a,
    0x510e527f,
    0x9b05688c,
    0x1f83d9ab,
    0x5be0cd19
}

Definition at line 188 of file sha2.c.

Referenced by SHA256_Init().

sha2_hex_digits

const char sha2_hex_digits[] = "0123456789abcdef"

static

Definition at line 271 of file sha2.c.

Referenced by SHA256_End(), SHA384_End(), and SHA512_End().

sha384_initial_hash_value

const sha2_word64 sha384_initial_hash_value[8]

static

Initial value:

= {
    SHA2_WORD64_CONST(0xcbbb9d5d, 0xc1059ed8),
    SHA2_WORD64_CONST(0x629a292a, 0x367cd507),
    SHA2_WORD64_CONST(0x9159015a, 0x3070dd17),
    SHA2_WORD64_CONST(0x152fecd8, 0xf70e5939),
    SHA2_WORD64_CONST(0x67332667, 0xffc00b31),
    SHA2_WORD64_CONST(0x8eb44a87, 0x68581511),
    SHA2_WORD64_CONST(0xdb0c2e0d, 0x64f98fa7),
 
}

Definition at line 244 of file sha2.c.

Referenced by SHA384_Init().

sha512_initial_hash_value

const sha2_word64 sha512_initial_hash_value[8]

static

Initial value:

= {
    SHA2_WORD64_CONST(0x6a09e667, 0xf3bcc908),
    SHA2_WORD64_CONST(0xbb67ae85, 0x84caa73b),
    SHA2_WORD64_CONST(0x3c6ef372, 0xfe94f82b),
    SHA2_WORD64_CONST(0xa54ff53a, 0x5f1d36f1),
    SHA2_WORD64_CONST(0x510e527f, 0xade682d1),
    SHA2_WORD64_CONST(0x9b05688c, 0x2b3e6c1f),
    SHA2_WORD64_CONST(0x1f83d9ab, 0xfb41bd6b),
 
}

Definition at line 256 of file sha2.c.

Referenced by SHA512_Init().