ctx->key_len = cipher->key_len; }
void EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,	     unsigned char *key, unsigned char *iv)	{	if (cipher != NULL)		ctx->cipher=cipher;	ctx->cipher->init(ctx,key,iv,0);	ctx->encrypt=0;	ctx->buf_len=0;	}