dca_rsastart
error = dca_rsastart(ctx, plaintext, ciphertext, req,
error = dca_rsastart(ctx, ciphertext, plaintext, req,
error = dca_rsastart(ctx, data, signature, req, DCA_RSA_SIGN);
error = dca_rsastart(ctx, data, signature, req, DCA_RSA_SIGNR);
error = dca_rsastart(ctx, signature, data, req, DCA_RSA_VRFY);
error = dca_rsastart(ctx, signature, data, req, DCA_RSA_VRFYR);
int dca_rsastart(crypto_ctx_t *, crypto_data_t *, crypto_data_t *,
rv = dca_rsastart(&ctx, input, output, req, mode);
int dca_rsastart(crypto_ctx_t *, crypto_data_t *, crypto_data_t *,