40 lines
954 B
Plaintext
40 lines
954 B
Plaintext
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FUNCTION checkHV18teaser(FLAG VARCHAR2) RETURN NUMBER IS
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A VARCHAR2(4);
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B NUMBER(10);
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C NUMBER(10);
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H VARCHAR(40);
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BEGIN
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A := SUBSTR(FLAG,1,4);
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IF NOT (A = 'HV18') THEN
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RETURN 0;
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END IF;
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B := TO_NUMBER(SUBSTR(FLAG,6,2));
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C := TO_NUMBER(SUBSTR(FLAG,8,2));
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IF NOT (((B * C) = 6497) AND (B < C)) THEN
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RETURN 0;
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END IF;
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A := SUBSTR(FLAG,11,4);
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SELECT STANDARD_HASH(A, 'MD5') INTO H FROM DUAL;
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IF NOT (H = 'CF945B5A36D1D3E68FFF78829CC8DBF6') THEN
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RETURN 0;
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END IF;
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IF NOT ((UTL_RAW.CAST_TO_VARCHAR2(
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UTL_RAW.BIT_XOR (
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UTL_RAW.CAST_TO_RAW(SUBSTR(FLAG,16,4)),
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UTL_RAW.CAST_TO_RAW(SUBSTR(FLAG,21,4)))
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) = 'zvru') AND
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(TO_NUMBER(SUBSTR(FLAG,21,4)) = SQRT(8814961))) THEN
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RETURN 0;
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END IF;
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IF NOT ( UTL_RAW.CAST_TO_VARCHAR2(UTL_ENCODE.BASE64_ENCODE(UTL_RAW.CAST_TO_RAW(SUBSTR(FLAG,26,4)))) = 'RjBtMA==') THEN
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RETURN 0;
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END IF;
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DBMS_OUTPUT.PUT_LINE(A);
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RETURN 1;
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END;
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