《常见密码算法总结--(1)分组对称密码》见
http://bbs.pediy.com/showthread.php?t=113921
http://blog.csdn.net/NJZhuJinhua/archive/2010/05/27/5629455.aspx

《常见密码算法总结--(2)分组密码加密模式》见
http://bbs.pediy.com/showthread.php?t=114169
http://blog.csdn.net/NJZhuJinhua/archive/2010/05/30/5635313.aspx

NJZhuJinhua@csdn May.30, 2010
http://bbs.pediy.com/showthread.php?t=114170
http://blog.csdn.net/NJZhuJinhua/archive/2010/05/30/5635343.aspx
转载请注明出处。

（三）加密模式的openssl代码分析
openssl（本文所用openssl代码为1.0.0版本，2010.03.29发布。http://www.openssl.org 本文所用的内容最近几年应该未有更新，因而版本似乎也没多少关系）代码中crypto\modes目录下提供了cbc128,cfb128,ctr128,cts128,ofb128模式的实现。modes.h提供接口声明，其余诸文件分别提供了各种模式。

typedef void (*block128_f)(const unsigned char in[16],
                           unsigned char out[16],
                           const void *key);

typedef void (*cbc128_f)(const unsigned char *in, unsigned char *out,
                         size_t len, const void *key,
                         unsigned char ivec[16], int enc);

//cbc128的加密与解密
void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
                           size_t len, const void *key,
                           unsigned char ivec[16], block128_f block);
void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
                           size_t len, const void *key,
                           unsigned char ivec[16], block128_f block);

//ctr128的加密与解密
void CRYPTO_ctr128_encrypt(const unsigned char *in, unsigned char *out,
                           size_t len, const void *key,
                           unsigned char ivec[16], unsigned char ecount_buf[16],
                           unsigned int *num, block128_f block);


//ofb128的加密与解密
void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
                           size_t len, const void *key,
                           unsigned char ivec[16], int *num,
                           block128_f block);


//cfb128的加密与解密
void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,
                           size_t len, const void *key,
                           unsigned char ivec[16], int *num,
                           int enc, block128_f block);
void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out,
                             size_t length, const void *key,
                             unsigned char ivec[16], int *num,
                             int enc, block128_f block);
void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out,
                             size_t bits, const void *key,
                             unsigned char ivec[16], int *num,
                             int enc, block128_f block);


//cts128模式
size_t CRYPTO_cts128_encrypt_block(const unsigned char *in, unsigned char *out,
                                   size_t len, const void *key,
                                   unsigned char ivec[16], block128_f block);
size_t CRYPTO_cts128_encrypt(const unsigned char *in, unsigned char *out,
                             size_t len, const void *key,
                             unsigned char ivec[16], cbc128_f cbc);
size_t CRYPTO_cts128_decrypt_block(const unsigned char *in, unsigned char *out,
                                   size_t len, const void *key,
                                   unsigned char ivec[16], block128_f block);
size_t CRYPTO_cts128_decrypt(const unsigned char *in, unsigned char *out,
                             size_t len, const void *key,
                             unsigned char ivec[16], cbc128_f cbc);

void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
		     size_t len, const AES_KEY *key,
		     unsigned char *ivec, const int enc) {

	if (enc)
		CRYPTO_cbc128_encrypt(in,out,len,key,ivec,(block128_f)AES_encrypt);
	else
		CRYPTO_cbc128_decrypt(in,out,len,key,ivec,(block128_f)AES_decrypt);
}

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