src/modules/auth/rfc2617_sha256.c
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 /*
  * Digest Authentication Module
  * Digest response calculation as per RFC2617
  *
  * Copyright (C) 2001-2003 FhG Fokus
  *
  * This file is part of Kamailio, a free SIP server.
  *
  * Kamailio is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version
  *
  * Kamailio is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */
 
 
 #include <sys/types.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "rfc2617_sha256.h"
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 #include "../../core/crypto/sha256.h"
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 #include "../../core/dprint.h"
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 inline void cvt_hex_sha256(HASH_SHA256 _b, HASHHEX_SHA256 _h)
 {
 	unsigned short i;
 	unsigned char j;
 
 	for (i = 0; i < HASHLEN_SHA256; i++) {
 		j = (_b[i] >> 4) & 0xf;
 		if (j <= 9) {
 			_h[i * 2] = (j + '0');
 		} else {
 			_h[i * 2] = (j + 'a' - 10);
 		}
 
 		j = _b[i] & 0xf;
 
 		if (j <= 9) {
 			_h[i * 2 + 1] = (j + '0');
 		} else {
 			_h[i * 2 + 1] = (j + 'a' - 10);
 		}
 	};
 
 	_h[HASHHEXLEN_SHA256] = '\0';
 }
 
 /* Cast to unsigned values and forward to sr_SHA256_Update */
 static inline void SHA256_Update(SHA256_CTX* context, char *data, int len)
 {
 	sr_SHA256_Update(context, (unsigned char*)data, (unsigned int)len);
 }
 
 /*
  * calculate H(A1) as per spec
  */
 void calc_HA1_sha256(ha_alg_t _alg, str* _username, str* _realm, str* _password,
 		str* _nonce, str* _cnonce, HASHHEX_SHA256 _sess_key)
 {
 	SHA256_CTX Sha256Ctx;
 	HASH_SHA256 HA1;
 
 	sr_SHA256_Init(&Sha256Ctx);
 	SHA256_Update(&Sha256Ctx, _username->s, _username->len);
 	SHA256_Update(&Sha256Ctx, ":", 1);
 	SHA256_Update(&Sha256Ctx, _realm->s, _realm->len);
 	SHA256_Update(&Sha256Ctx, ":", 1);
 	SHA256_Update(&Sha256Ctx, _password->s, _password->len);
 	sr_SHA256_Final(HA1, &Sha256Ctx);
 
 	if (_alg == HA_MD5_SESS) {
 		sr_SHA256_Init(&Sha256Ctx);
 		sr_SHA256_Update(&Sha256Ctx, HA1, HASHLEN_SHA256);
 		SHA256_Update(&Sha256Ctx, ":", 1);
 		SHA256_Update(&Sha256Ctx, _nonce->s, _nonce->len);
 		SHA256_Update(&Sha256Ctx, ":", 1);
 		SHA256_Update(&Sha256Ctx, _cnonce->s, _cnonce->len);
 		sr_SHA256_Final(HA1, &Sha256Ctx);
 	};
 
 	cvt_hex_sha256(HA1, _sess_key);
 }
 
 
 /*
  * calculate request-digest/response-digest as per HTTP Digest spec
  */
 void calc_response_sha256(HASHHEX_SHA256 _ha1,      /* H(A1) */
 		str* _nonce,       /* nonce from server */
 		str* _nc,          /* 8 hex digits */
 		str* _cnonce,      /* client nonce */
 		str* _qop,         /* qop-value: "", "auth", "auth-int" */
 		int _auth_int,     /* 1 if auth-int is used */
 		str* _method,      /* method from the request */
 		str* _uri,         /* requested URL */
 		HASHHEX_SHA256 _hentity,  /* H(entity body) if qop="auth-int" */
 		HASHHEX_SHA256 _response) /* request-digest or response-digest */
 {
 	SHA256_CTX Sha256Ctx;
 	HASH_SHA256 HA2;
 	HASH_SHA256 RespHash;
 	HASHHEX_SHA256 HA2Hex;
 
 	/* calculate H(A2) */
 	sr_SHA256_Init(&Sha256Ctx);
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 	if (_method) {
 		SHA256_Update(&Sha256Ctx, _method->s, _method->len);
 	}
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 	SHA256_Update(&Sha256Ctx, ":", 1);
 	SHA256_Update(&Sha256Ctx, _uri->s, _uri->len);
 
 	if (_auth_int) {
 		SHA256_Update(&Sha256Ctx, ":", 1);
 		SHA256_Update(&Sha256Ctx, _hentity, HASHHEXLEN_SHA256);
 	};
 
 	sr_SHA256_Final(HA2, &Sha256Ctx);
 	cvt_hex_sha256(HA2, HA2Hex);
 
 	/* calculate response */
 	sr_SHA256_Init(&Sha256Ctx);
 	SHA256_Update(&Sha256Ctx, _ha1, HASHHEXLEN_SHA256);
 	SHA256_Update(&Sha256Ctx, ":", 1);
 	SHA256_Update(&Sha256Ctx, _nonce->s, _nonce->len);
 	SHA256_Update(&Sha256Ctx, ":", 1);
 
 	if (_qop->len) {
 		SHA256_Update(&Sha256Ctx, _nc->s, _nc->len);
 		SHA256_Update(&Sha256Ctx, ":", 1);
 		SHA256_Update(&Sha256Ctx, _cnonce->s, _cnonce->len);
 		SHA256_Update(&Sha256Ctx, ":", 1);
 		SHA256_Update(&Sha256Ctx, _qop->s, _qop->len);
 		SHA256_Update(&Sha256Ctx, ":", 1);
 	};
 	SHA256_Update(&Sha256Ctx, HA2Hex, HASHHEXLEN_SHA256);
 	sr_SHA256_Final(RespHash, &Sha256Ctx);
 	cvt_hex_sha256(RespHash, _response);
 }