在使用某个密码算法前需要先注册，然后才能使用。密码算法索引值的获取步骤
- 步骤1. 利用int register_cipher(const struct ltc_cipher_descriptor *cipher)注册算法
- 步骤2. 利用int find_cipher(const char *name)获取已注册的密码算法索引值
- 步骤3. 使用完毕后利用int unregister_cipher(const struct ltc_cipher_descriptor *cipher)注销密码算法
函数find_cipher(const char *name)中的name对应ltc_cipher_descriptor中的name。
程序中可以注册以下密码算法(struct ltc_cipher_descriptor)
register_cipher (&aes_desc);
register_cipher (&blowfish_desc);
register_cipher (&xtea_desc);
register_cipher (&rc5_desc);
register_cipher (&rc6_desc);
register_cipher (&saferp_desc);
register_cipher (&twofish_desc);
register_cipher (&safer_k64_desc);
register_cipher (&safer_sk64_desc);
register_cipher (&safer_k128_desc);
register_cipher (&safer_sk128_desc);
register_cipher (&rc2_desc);
register_cipher (&des_desc);
register_cipher (&des3_desc);
register_cipher (&cast5_desc);
register_cipher (&noekeon_desc);
register_cipher (&skipjack_desc);
register_cipher (&khazad_desc);
register_cipher (&anubis_desc);
例
以下是一个简单的使用AES-ECB加解密的概要过程。
if ( register_cipher (&aes_desc) != CRYPT_OK )// 注册aes
return CRYPT_INVALID_CIPHER;
if ((idx = find_cipher(“aes”)) == -1) // 找到aes索引号，在后面使用
return CRYPT_NOP;
if ((err = ecb_start(idx, key, keylen, 0, &ctr)) != CRYPT_OK)//ECB初始化
return err;
if ((err = ecb_encrypt( pt, ct, msglen, &ctr)) != CRYPT_OK) //ECB加密
return err;
if ((err = ecb_decrypt( ct, pt, msglen, &ctr)) != CRYPT_OK) //ECB解密
return err;
ecb_done(&ctr); //ECB反初始化
unregister_cipher(&aes_desc); //注销aes
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