C++ EVP_DigestInit函數代碼示例

void md5(
	const void *content, ssize_t content_len, 
	char *result, ssize_t result_len)
{
	assert(result_len==33); // md5+1 length

	int i, j;
	EVP_MD_CTX mdctx;
	unsigned char md_value[EVP_MAX_MD_SIZE];
	unsigned int md_len;

	EVP_DigestInit(&mdctx, EVP_md5());
	EVP_DigestUpdate(&mdctx, content, (size_t) content_len);
	EVP_DigestFinal_ex(&mdctx, md_value, &md_len);
	EVP_MD_CTX_cleanup(&mdctx);

	char byte[3];
	j=0;
	for(i=0; i<md_len; i++)
	{
		snprintf(byte, sizeof(byte), "%02x", md_value[i]);
		result[j++]=byte[0];
		result[j++]=byte[1];
	}
	
	result[j]=0;
}

static char *
digest_calculate(char *filename,
		 char **digest_type, char *digest_string, unsigned *md_len_p,
		 file_offset_t *filesizep)
{
	int fd, i, rv;
	EVP_MD_CTX md_ctx;
	unsigned char md_value[EVP_MAX_MD_SIZE];
	char buffer[GFS_FILE_BUFSIZE];

	if ((fd = open(filename, O_RDONLY)) == -1)
		return (gfarm_errno_to_error(errno));
	EVP_DigestInit(&md_ctx, GFS_DEFAULT_DIGEST_MODE);
	rv = gfs_digest_calculate_local(
		fd, buffer, GFS_FILE_BUFSIZE,
		GFS_DEFAULT_DIGEST_MODE,
		&md_ctx, md_len_p, md_value, filesizep);
	close(fd);
	if (rv != 0)
		return (gfarm_errno_to_error(rv));

	for (i = 0; i < *md_len_p; i++)
		sprintf(&digest_string[i + i], "%02x",
			md_value[i]);

	*digest_type = GFS_DEFAULT_DIGEST_NAME;
	return (NULL);
}

/** @impl_interface_method{RTCRDIGESTDESC::pfnInit} */
static DECLCALLBACK(int) rtCrDigestOsslEvp_Init(void *pvState, void *pvOpaque, bool fReInit)
{
    EVP_MD_CTX   *pThis    = (EVP_MD_CTX *)pvState;
    EVP_MD const *pEvpType = (EVP_MD const *)pvOpaque;

    if (fReInit)
    {
        pEvpType = EVP_MD_CTX_md(pThis);
# if OPENSSL_VERSION_NUMBER >= 0x10100000 && !defined(LIBRESSL_VERSION_NUMBER)
        EVP_MD_CTX_reset(pThis);
# else
        EVP_MD_CTX_cleanup(pThis);
# endif
    }

    AssertPtrReturn(pEvpType, VERR_INVALID_PARAMETER);
# if OPENSSL_VERSION_NUMBER >= 0x10100000 && !defined(LIBRESSL_VERSION_NUMBER)
    Assert(EVP_MD_block_size(pEvpType));
# else
    Assert(pEvpType->md_size);
# endif
    if (EVP_DigestInit(pThis, pEvpType))
        return VINF_SUCCESS;
    return VERR_CR_DIGEST_OSSL_DIGEST_INIT_ERROR;
}

int
px_find_digest(const char *name, PX_MD ** res)
{
	const EVP_MD *md;
	EVP_MD_CTX *ctx;
	PX_MD	   *h;

	if (!px_openssl_initialized)
	{
		px_openssl_initialized = 1;
		OpenSSL_add_all_algorithms();
	}

	md = EVP_get_digestbyname(name);
	if (md == NULL)
		return PXE_NO_HASH;

	ctx = px_alloc(sizeof(*ctx));
	EVP_DigestInit(ctx, md);

	h = px_alloc(sizeof(*h));
	h->result_size = digest_result_size;
	h->block_size = digest_block_size;
	h->reset = digest_reset;
	h->update = digest_update;
	h->finish = digest_finish;
	h->free = digest_free;
	h->p.ptr = (void *) ctx;

	*res = h;
	return 0;
}

void HashFile(char *filename, unsigned char digest[EVP_MAX_MD_SIZE + 1], HashMethod type)
{
    FILE *file;
    EVP_MD_CTX context;
    int len, md_len;
    unsigned char buffer[1024];
    const EVP_MD *md = NULL;

    CfDebug("HashFile(%d,%s)\n", type, filename);

    if ((file = fopen(filename, "rb")) == NULL)
    {
        CfOut(OUTPUT_LEVEL_INFORM, "fopen", "%s can't be opened\n", filename);
    }
    else
    {
        md = EVP_get_digestbyname(FileHashName(type));

        EVP_DigestInit(&context, md);

        while ((len = fread(buffer, 1, 1024, file)))
        {
            EVP_DigestUpdate(&context, buffer, len);
        }

        EVP_DigestFinal(&context, digest, &md_len);

        /* Digest length stored in md_len */
        fclose(file);
    }
}

static int create_digest(BIO *input, char *digest, const EVP_MD *md,
                         unsigned char **md_value)
{
    int md_value_len;

    md_value_len = EVP_MD_size(md);
    if (md_value_len < 0)
        return 0;

    if (input) {
        EVP_MD_CTX md_ctx;
        unsigned char buffer[4096];
        int length;

        *md_value = app_malloc(md_value_len, "digest buffer");
        EVP_DigestInit(&md_ctx, md);
        while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) {
            EVP_DigestUpdate(&md_ctx, buffer, length);
        }
        if (!EVP_DigestFinal(&md_ctx, *md_value, NULL))
            return 0;
    } else {
        long digest_len;
        *md_value = string_to_hex(digest, &digest_len);
        if (!*md_value || md_value_len != digest_len) {
            OPENSSL_free(*md_value);
            *md_value = NULL;
            BIO_printf(bio_err, "bad digest, %d bytes "
                       "must be specified\n", md_value_len);
            return 0;
        }
    }
    return md_value_len;
}

char *do_sha1(char *tohash, int size)
{
  EVP_MD_CTX ctx;
  char *hash_ret;
  int evp_ret_len;

  if (!tohash)
    {
      debug_printf(DEBUG_NORMAL, "Invalid value passed to do_sha1()!\n");
      return NULL;
    }

  hash_ret = (char *)malloc(21);  // We should get 20 bytes returned.
  if (hash_ret == NULL)
    {
      printf("There was a malloc() error in eapsim.c with hash_ret!\n");
      return NULL;
    }
 
  EVP_DigestInit(&ctx, EVP_sha1());
  EVP_DigestUpdate(&ctx, tohash, size);
  EVP_DigestFinal(&ctx, hash_ret, (int *)&evp_ret_len);

  if (evp_ret_len != 20) printf("SHA1 returned something other than what it should have!\n");

  return hash_ret;
}

void HashString(const char *buffer, int len, unsigned char digest[EVP_MAX_MD_SIZE + 1], HashMethod type)
{
    EVP_MD_CTX context;
    const EVP_MD *md = NULL;
    int md_len;

    CfDebug("HashString(%c)\n", type);

    switch (type)
    {
    case HASH_METHOD_CRYPT:
        CfOut(OUTPUT_LEVEL_ERROR, "", "The crypt support is not presently implemented, please use another algorithm instead");
        memset(digest, 0, EVP_MAX_MD_SIZE + 1);
        break;

    default:
        md = EVP_get_digestbyname(FileHashName(type));

        if (md == NULL)
        {
            CfOut(OUTPUT_LEVEL_INFORM, "", " !! Digest type %s not supported by OpenSSL library", CF_DIGEST_TYPES[type][0]);
        }

        EVP_DigestInit(&context, md);
        EVP_DigestUpdate(&context, (unsigned char *) buffer, (size_t) len);
        EVP_DigestFinal(&context, digest, &md_len);
        break;
    }
}

/*
 * MD5authencrypt - generate message digest
 *
 * Returns length of MAC including key ID and digest.
 */
int
MD5authencrypt(
	int	type,		/* hash algorithm */
	u_char	*key,		/* key pointer */
	u_int32 *pkt,		/* packet pointer */
	int	length		/* packet length */
	)
{
	u_char	digest[EVP_MAX_MD_SIZE];
	u_int	len;
	EVP_MD_CTX ctx;

	/*
	 * Compute digest of key concatenated with packet. Note: the
	 * key type and digest type have been verified when the key
	 * was creaded.
	 */
	INIT_SSL();
	EVP_DigestInit(&ctx, EVP_get_digestbynid(type));
	EVP_DigestUpdate(&ctx, key, (u_int)cache_keylen);
	EVP_DigestUpdate(&ctx, (u_char *)pkt, (u_int)length);
	EVP_DigestFinal(&ctx, digest, &len);
	memmove((u_char *)pkt + length + 4, digest, len);
	return (len + 4);
}

int _ldapfull_chk_hashed(moddata_t data, const char *scheme, int salted, const char *hash, const char *passwd) {
    char *bhash; // binary hash, will get it from base64
    EVP_MD_CTX mdctx;
    const EVP_MD *md;
    unsigned char digest[EVP_MAX_MD_SIZE];
    int bhlen, rc;

    md = EVP_get_digestbyname(scheme);
    if (!md) {
        return 0;
    }
    if( ! _ldapfull_base64_decode(hash, &bhash, &bhlen) ) {
        return 0;
    }

    EVP_DigestInit(&mdctx, md);
    EVP_DigestUpdate(&mdctx, passwd, strlen(passwd));
    if (salted) {
        EVP_DigestUpdate(&mdctx, &bhash[EVP_MD_size(md)],
                bhlen - EVP_MD_size(md));
    }
    EVP_DigestFinal(&mdctx, digest, NULL);

    rc = memcmp((char *)bhash, (char *)digest, EVP_MD_size(md));
    free(bhash);
    return !rc;
}

/*
 * Caclulate a new key after a reconnect
 */
void
calculate_new_key(u_int64_t *key, u_int64_t cookie, u_int64_t challenge)
{
	int r;

	const EVP_MD *md = EVP_sha1();
	EVP_MD_CTX ctx;
	char hash[EVP_MAX_MD_SIZE];
	struct sshbuf *b;

	if ((b = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);
	if ((r = sshbuf_put_u64(b, *key)) != 0 ||
	    (r = sshbuf_put_u64(b, cookie)) != 0 ||
	    (r = sshbuf_put_u64(b, challenge)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));

	EVP_DigestInit(&ctx, md);
	EVP_DigestUpdate(&ctx, sshbuf_ptr(b), sshbuf_len(b));
	EVP_DigestFinal(&ctx, hash, NULL);

	sshbuf_reset(b);
	if ((r = sshbuf_put(b, hash, EVP_MD_size(md))) != 0 ||
	    (r = sshbuf_get_u64(b, key)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	sshbuf_free(b);
}

QString pki_evp::sha512passwd(QString pass, QString salt)
{

	EVP_MD_CTX mdctx;
	QString str;
	int n;
	int j;
	unsigned char m[EVP_MAX_MD_SIZE];

	if (salt.length() <5)
		abort();

	str = salt.left(5);
	pass = str + pass;

	EVP_DigestInit(&mdctx, EVP_sha512());
	EVP_DigestUpdate(&mdctx, CCHAR(pass), pass.size());
	EVP_DigestFinal(&mdctx, m, (unsigned*)&n);

	for (j=0; j<n; j++) {
		char zs[4];
		sprintf(zs, "%02X",m[j]);
		str += zs;
	}
	return str;
}

bool _IDB_XCH::new_msgiv( IDB_PH1 * ph1 )
{
	if( ph1->evp_cipher == NULL )
		return false;

	unsigned char iv_data[ EVP_MAX_MD_SIZE ];
	unsigned long iv_size = EVP_CIPHER_iv_length( ph1->evp_cipher );

	EVP_MD_CTX ctx_hash;
	EVP_DigestInit( &ctx_hash, ph1->evp_hash );
	EVP_DigestUpdate( &ctx_hash, ph1->iv.buff(), ph1->iv.size() );
	EVP_DigestUpdate( &ctx_hash, &msgid, 4 );
	EVP_DigestFinal( &ctx_hash, iv_data, NULL );
	EVP_MD_CTX_cleanup( &ctx_hash );

	iv.set( iv_data, iv_size );

	iked.log.bin(
		LLOG_DEBUG,
		LLOG_DECODE,
		iv.buff(),
		iv.size(),
		"== : new %s iv",
		name() );

	return true;
}

bool send_chal_reply(connection_t *c) {
	char hash[EVP_MAX_MD_SIZE * 2 + 1];
	EVP_MD_CTX *ctx;

	/* Calculate the hash from the challenge we received */

	ctx = EVP_MD_CTX_create();

	if(!ctx) {
		abort();
	}

	if(!EVP_DigestInit(ctx, c->indigest)
	                || !EVP_DigestUpdate(ctx, c->mychallenge, RSA_size(myself->connection->rsa_key))
	                || !EVP_DigestFinal(ctx, (unsigned char *)hash, NULL)) {
		EVP_MD_CTX_destroy(ctx);
		logger(LOG_ERR, "Error during calculation of response for %s (%s): %s",
		       c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
		return false;
	}

	EVP_MD_CTX_destroy(ctx);

	/* Convert the hash to a hexadecimal formatted string */

	bin2hex(hash, hash, EVP_MD_size(c->indigest));
	hash[EVP_MD_size(c->indigest) * 2] = '\0';

	/* Send the reply */

	return send_request(c, "%d %s", CHAL_REPLY, hash);
}

void
derive_ssh1_session_id(BIGNUM *host_modulus, BIGNUM *server_modulus,
    u_int8_t cookie[8], u_int8_t id[16])
{
	const EVP_MD *evp_md = EVP_md5();
	EVP_MD_CTX md;
	u_int8_t nbuf[2048], obuf[EVP_MAX_MD_SIZE];
	int len;

	EVP_DigestInit(&md, evp_md);

	len = BN_num_bytes(host_modulus);
	if (len < (512 / 8) || (u_int)len > sizeof(nbuf))
		fatal("%s: bad host modulus (len %d)", __func__, len);
	BN_bn2bin(host_modulus, nbuf);
	EVP_DigestUpdate(&md, nbuf, len);

	len = BN_num_bytes(server_modulus);
	if (len < (512 / 8) || (u_int)len > sizeof(nbuf))
		fatal("%s: bad server modulus (len %d)", __func__, len);
	BN_bn2bin(server_modulus, nbuf);
	EVP_DigestUpdate(&md, nbuf, len);

	EVP_DigestUpdate(&md, cookie, 8);

	EVP_DigestFinal(&md, obuf, NULL);
	memcpy(id, obuf, 16);

	memset(nbuf, 0, sizeof(nbuf));
	memset(obuf, 0, sizeof(obuf));
	memset(&md, 0, sizeof(md));
}