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rijndael.h
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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00005  * 1.1 (the "License"); you may not use this file except in compliance with
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00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is the Netscape security libraries.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Netscape Communications Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 1994-2000
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00023  * Alternatively, the contents of this file may be used under the terms of
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00036 /* $Id: rijndael.h,v 1.11 2005/08/06 07:24:21 nelsonb%netscape.com Exp $ */
00037 
00038 #ifndef _RIJNDAEL_H_
00039 #define _RIJNDAEL_H_ 1
00040 
00041 #define RIJNDAEL_MIN_BLOCKSIZE 16 /* bytes */
00042 #define RIJNDAEL_MAX_BLOCKSIZE 32 /* bytes */
00043 
00044 typedef SECStatus AESFunc(AESContext *cx, unsigned char *output,
00045                           unsigned int *outputLen, unsigned int maxOutputLen,
00046                           const unsigned char *input, unsigned int inputLen, 
00047                           unsigned int blocksize);
00048 
00049 typedef SECStatus AESBlockFunc(AESContext *cx, 
00050                                unsigned char *output,
00051                                const unsigned char *input);
00052 
00053 /* RIJNDAEL_NUM_ROUNDS
00054  *
00055  * Number of rounds per execution
00056  * Nk - number of key bytes
00057  * Nb - blocksize (in bytes)
00058  */
00059 #define RIJNDAEL_NUM_ROUNDS(Nk, Nb) \
00060     (PR_MAX(Nk, Nb) + 6)
00061 
00062 /* RIJNDAEL_MAX_STATE_SIZE 
00063  *
00064  * Maximum number of bytes in the state (spec includes up to 256-bit block
00065  * size)
00066  */
00067 #define RIJNDAEL_MAX_STATE_SIZE 32
00068 
00069 /*
00070  * This magic number is (Nb_max * (Nr_max + 1))
00071  * where Nb_max is the maximum block size in 32-bit words,
00072  *       Nr_max is the maximum number of rounds, which is Nb_max + 6
00073  */
00074 #define RIJNDAEL_MAX_EXP_KEY_SIZE (8 * 15)
00075 
00076 /* AESContextStr
00077  *
00078  * Values which maintain the state for Rijndael encryption/decryption.
00079  *
00080  * iv          - initialization vector for CBC mode
00081  * Nb          - the number of bytes in a block, specified by user
00082  * Nr          - the number of rounds, specified by a table
00083  * expandedKey - the round keys in 4-byte words, the length is Nr * Nb
00084  * worker      - the encryption/decryption function to use with this context
00085  */
00086 struct AESContextStr
00087 {
00088     unsigned int   Nb;
00089     unsigned int   Nr;
00090     AESFunc       *worker;
00091     unsigned char iv[RIJNDAEL_MAX_BLOCKSIZE];
00092     PRUint32      expandedKey[RIJNDAEL_MAX_EXP_KEY_SIZE];
00093 };
00094 
00095 #endif /* _RIJNDAEL_H_ */