1 | /* |
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2 | * Copyright (c) 2002, 2003 Bob Deblier |
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3 | * |
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4 | * This library is free software; you can redistribute it and/or |
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5 | * modify it under the terms of the GNU Lesser General Public |
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6 | * License as published by the Free Software Foundation; either |
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7 | * version 2.1 of the License, or (at your option) any later version. |
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8 | * |
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9 | * This library is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | * Lesser General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU Lesser General Public |
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15 | * License along with this library; if not, write to the Free Software |
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16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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17 | * |
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18 | */ |
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19 | |
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20 | /*!\file aes.h |
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21 | * \brief AES block cipher, as specified by NIST FIPS 197. |
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22 | * \author Bob Deblier <bob.deblier@pandora.be> |
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23 | * \ingroup BC_m BC_aes_m |
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24 | */ |
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25 | |
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26 | #ifndef _AES_H |
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27 | #define _AES_H |
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28 | |
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29 | #include <glib.h> |
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30 | #include "beecrypt_compat.h" |
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31 | |
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32 | /*!\brief Holds all the parameters necessary for the AES cipher. |
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33 | * \ingroup BC_aes_m |
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34 | */ |
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35 | typedef struct |
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36 | { |
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37 | /*!\var k |
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38 | * \brief Holds the key expansion. |
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39 | */ |
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40 | guint32 k[64]; |
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41 | /*!\var nr |
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42 | * \brief Number of rounds to be used in encryption/decryption. |
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43 | */ |
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44 | guint32 nr; |
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45 | /*!\var fdback |
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46 | * \brief Buffer to be used by block chaining or feedback modes. |
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47 | */ |
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48 | guint32 fdback[4]; |
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49 | } aesParam; |
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50 | |
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51 | #ifdef __cplusplus |
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52 | extern "C" { |
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53 | #endif |
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54 | |
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55 | /*!\fn int aesSetup(aesParam* ap, const byte* key, size_t keybits, cipherOperation op) |
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56 | * \brief This function performs the cipher's key expansion. |
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57 | * \param ap The cipher's parameter block. |
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58 | * \param key The key value. |
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59 | * \param keybits The number of bits in the key; legal values are: |
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60 | * 128, 192 and 256. |
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61 | * \param op ENCRYPT or DECRYPT. |
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62 | * \retval 0 on success. |
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63 | * \retval -1 on failure. |
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64 | */ |
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65 | |
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66 | int aesSetup (aesParam* ap, const byte* key, size_t keybits, cipherOperation op); |
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67 | |
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68 | /*!\fn int aesSetIV(aesParam* ap, const byte* iv) |
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69 | * \brief This function sets the Initialization Vector. |
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70 | * \note This function is only useful in block chaining or feedback modes. |
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71 | * \param ap The cipher's parameter block. |
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72 | * \param iv The initialization vector; may be null. |
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73 | * \retval 0 on success. |
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74 | */ |
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75 | |
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76 | int aesSetIV (aesParam* ap, const byte* iv); |
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77 | |
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78 | /*!\fn aesEncrypt(aesParam* ap, guint32* dst, const guint32* src) |
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79 | * \brief This function performs the raw AES encryption; it encrypts one block |
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80 | * of 128 bits. |
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81 | * \param ap The cipher's parameter block. |
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82 | * \param dst The ciphertext; should be aligned on 32-bit boundary. |
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83 | * \param src The cleartext; should be aligned on 32-bit boundary. |
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84 | * \retval 0 on success. |
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85 | */ |
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86 | |
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87 | int aesEncrypt (aesParam* ap, guint32* dst, const guint32* src); |
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88 | |
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89 | /*!\fn aesDecrypt(aesParam* ap, guint32* dst, const guint32* src) |
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90 | * \brief This function performs the raw AES decryption; it decrypts one block |
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91 | * of 128 bits. |
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92 | * \param ap The cipher's parameter block. |
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93 | * \param dst The cleartext; should be aligned on 32-bit boundary. |
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94 | * \param src The ciphertext; should be aligned on 32-bit boundary. |
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95 | * \retval 0 on success. |
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96 | */ |
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97 | |
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98 | int aesDecrypt (aesParam* ap, guint32* dst, const guint32* src); |
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99 | |
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100 | |
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101 | guint32* aesFeedback(aesParam* ap); |
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102 | |
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103 | #ifdef __cplusplus |
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104 | } |
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105 | #endif |
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106 | |
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107 | #endif |
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