static void rc2_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
unsigned char *iv,int enc);
static void rc2_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
unsigned char *in, unsigned int inl);
static void rc2_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
unsigned char *iv,int enc);
static void rc2_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
unsigned char *in, unsigned int inl);