EVP_CIPHER_CTX_copy
if (!EVP_CIPHER_CTX_copy(out->cipher_ctx, in->cipher_ctx))
ret = EVP_CIPHER_CTX_copy(dctx->cipher_ctx, ctx->cipher_ctx);
int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in);
LCRYPTO_ALIAS(EVP_CIPHER_CTX_copy);
LCRYPTO_USED(EVP_CIPHER_CTX_copy);