40     mbedtls_printf("MBEDTLS_ECDSA_C and/or MBEDTLS_SHA256_C and/or "  in main()
50     mbedtls_printf("%s", title);  in dump_buf()
52         mbedtls_printf("%c%c", "0123456789ABCDEF" [buf[i] / 16],  in dump_buf()
55     mbedtls_printf("\n");  in dump_buf()
65         mbedtls_printf("internal error\n");  in dump_pubkey()
101         mbedtls_printf("usage: ecdsa\n");  in main()
104         mbedtls_printf("\n");  in main()
113     mbedtls_printf("\n  . Seeding the random number generator...");  in main()
120         mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret);  in main()
124     mbedtls_printf(" ok\n  . Generating key pair...");  in main()
129         mbedtls_printf(" failed\n  ! mbedtls_ecdsa_genkey returned %d\n", ret);  in main()
136     mbedtls_printf(" ok (key size: %d bits)\n", (int) curve_info->bit_size);  in main()
143     mbedtls_printf("  . Computing message hash...");  in main()
147         mbedtls_printf(" failed\n  ! mbedtls_sha256 returned %d\n", ret);  in main()
151     mbedtls_printf(" ok\n");  in main()
158     mbedtls_printf("  . Signing message hash...");  in main()
165         mbedtls_printf(" failed\n  ! mbedtls_ecdsa_write_signature returned %d\n", ret);  in main()
168     mbedtls_printf(" ok (signature length = %u)\n", (unsigned int) sig_len);  in main()
179     mbedtls_printf("  . Preparing verification context...");  in main()
183         mbedtls_printf(" failed\n  ! mbedtls_ecp_export returned %d\n", ret);  in main()
188         mbedtls_printf(" failed\n  ! mbedtls_ecp_set_public_key returned %d\n", ret);  in main()
195     mbedtls_printf(" ok\n  . Verifying signature...");  in main()
201         mbedtls_printf(" failed\n  ! mbedtls_ecdsa_read_signature returned %d\n", ret);  in main()
205     mbedtls_printf(" ok\n");  in main()