reset()
Internally calls EVP_CipherInit_ex(ctx, NULL, NULL, NULL, NULL, -1).
static VALUE ossl_cipher_reset(VALUE self) { EVP_CIPHER_CTX *ctx; GetCipher(self, ctx); if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, NULL, -1) != 1) ossl_raise(eCipherError, NULL); return self; }