密码库(密码库LibTomCrypt学习记录——（1)

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LibTomCtypt中AES的描述子有两个密码库，rijndael_desc和aes_desc，这二者除了name有区别外别的都一样密码库，因此aes和rijndael是等效的。

注意：VC编译AES的时候记得将aes_table.c设置为“exclude file from build”，别的带_table的c文件类似。“exclude file from build”的设置方式为：右键点击aes_table.c，选择Settings → General → exclude file from build。

AES的测试例见aes.c的int ECB_TEST(void)，记得在使用前需要先注册aes的描述子。

tomcrypt_cipher.h中对AES的描述为

//aes和rijndael是一个意思

#define aes_setup rijndael_setup

#define aes_ecb_encrypt rijndael_ecb_encrypt

#define aes_ecb_decrypt rijndael_ecb_decrypt

#define aes_test rijndael_test

#define aes_done rijndael_done

#define aes_keysize rijndael_keysize

#define aes_enc_setup rijndael_enc_setup

#define aes_enc_ecb_encrypt rijndael_enc_ecb_encrypt

#define aes_enc_keysize rijndael_enc_keysize

// aes和rijndael的相关函数有以下这些

int rijndael_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);

int rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);

int rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey);

int rijndael_test(void);

void rijndael_done(symmetric_key *skey);

int rijndael_keysize(int *keysize);

//带enc的这些函数是用于只需要加密而不需要解密的时候

int rijndael_enc_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);

int rijndael_enc_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey);

void rijndael_enc_done(symmetric_key *skey);

int rijndael_enc_keysize(int *keysize);

// aes和rijndael的相关描述子以及仅用于加密的描述子

extern const struct ltc_cipher_descriptor rijndael_desc, aes_desc;

extern const struct ltc_cipher_descriptor rijndael_enc_desc, aes_enc_desc;

在aes.c里面对相关函数做了详细描述，以不使用单加密模式（即既需要加密又需要解密）为例

#define SETUP rijndael_setup

#define ECB_ENC rijndael_ecb_encrypt

#define ECB_DEC rijndael_ecb_decrypt

#define ECB_DONE rijndael_done

#define ECB_TEST rijndael_test

#define ECB_KS rijndael_keysize

rijndael_desc描述子的详情如下

const struct ltc_cipher_descriptor rijndael_desc =

{

"rijndael",

6,

16, 32, 16, 10,

SETUP, ECB_ENC, ECB_DEC, ECB_TEST, ECB_DONE, ECB_KS,

NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

};

aes_desc描述子的详情如下

const struct ltc_cipher_descriptor aes_desc =

{

"aes",

6,

16, 32, 16, 10,

SETUP, ECB_ENC, ECB_DEC, ECB_TEST, ECB_DONE, ECB_KS,

NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL

};

aes涉及的函数如下：

──────────────────────────────────────

int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)

// [功能] 初始化，主要做密钥扩展

key // [输入] 密钥keylen // [输入] 密钥长度num_rounds // [输入] 轮数（建议设置为0以便让系统使用默认值）skey // [输出] 扩展密钥

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