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JavaTM 2 Platform Standard Ed. 5.0 |
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ÀÌÀü Ŭ·¡½º ´ÙÀ½ Ŭ·¡½º | ÇÁ·¹ÀÓÀ¸·Î ÇÁ·¹ÀÓ ¾øÀÌ | |||||||||
°³¿ä: NESTED | Çʵå | constructor | ¸Þ¼µå | »ó¼¼: Çʵå | »ý¼ºÀÚ | ¸Þ¼µå |
java.lang.Objectjava.util.Random
java.security.SecureRandom
public class SecureRandom
ÀÌ Å¬·¡½º´Â ¾ÏÈ£¿ëÀ¸·Î °ÈµÈ ³¼ö Á¦³×·¹ÀÌÅÍ (RNG)¸¦ Á¦°øÇÕ´Ï´Ù. ¸¹Àº ±¸ÇöÀº »ç ³¼ö Á¦³×·¹ÀÌÅÍ (PRNG)ÀÇ Çü½ÄÀÔ´Ï´Ù. À̰ÍÀº, ƯÁ¤ÀÇ °áÁ¤¼º ¾Ë°í¸®ÁòÀ» »ç¿ëÇØ ÁøÁ¤ÇÑ ³¼ö ¹èÁ¤À¸·ÎºÎÅÍ »ç ³¼ö ¼ø¼¸¦ »ý¼ºÇÏ´Â °ÍÀ» ¹ÌÇÕ´Ï´Ù. ±¸Çö¾È¿¡´Â ÁøÁ¤ÇÑ ³¼ö¸¦ »ý¼ºÇÏ´Â °Íµµ ÀÖÀ¸¸é, ¾çÂÊ ¸ðµÎÀÇ ±â¼úÀÇ Æí¼ºÀ» »ç¿ëÇÏ´Â °Íµµ ÀÖ½À´Ï´Ù.
¾ÏÈ£¿ëÀ¸·Î °ÈµÈ À¯»ç ³¼ö Á¦³×·¹ÀÌÅÍ´Â ¡¸FIPS 140-2, Security Requirements for Cryptographic Modules¡¹ ¼½¼Ç 4.9. 1 À¸·Î ÁöÁ¤µÇ°í ÀÖ´Â Åë°èÀû ³¼ö Á¦³×·¹ÀÌÅÍÀÇ Å×½ºÆ®¿¡ ÃÖÀúÇÑ ÀûÇÕÇϰí ÀÖ½À´Ï´Ù. ¶Ç, SecureRandom ¿¡¼´Â °áÁ¤¼ºÀÌ ¾Æ´Ñ Ãâ·ÂÀ» »ý¼ºÇÏÁö ¾ÊÀ¸¸é ¾ÈµÇ¾î, ±× ¶§¹®¿¡ ¹èÁ¤ ¼ÒÀç´Â ¿¹Ãø ºÒ°¡´ÉÇØ, SecureRandom Ãâ·ÂÀº ¡¸RFC 1750: Randomness Recommendations for Security¡¹ ·Î ±â¼úµÇ°í ÀÖ´Ù, ¾ÏÈ£¿ëÀ¸·Î °ÈµÈ ¼ø¼ÀÏ Çʿ䰡 ÀÖ½À´Ï´Ù.
Java Security API
¾Ë°í¸®Áò º£À̽º¿ÜÀÇ Å¬·¡½º¿Í °°ÀÌ, SecureRandom Ŭ·¡½º´Â ±¸Çö¿¡
Á¸ÇÏÁö ¾Ê´Â ¾Ë°í¸®ÁòÀ» Á¦°øÇÕ´Ï´Ù. Áï, È£ÃâÃø (¾îÇø®ÄÉÀ̼ÇÀÇ ÄÚµå)Àº, ƯÁ¤ÀÇ RNG ¾Ë°í¸®ÁòÀ» ¿ä±¸Çϸé, ±× ¾Ë°í¸®Áò¿¡ ´ëÀÀÇÏ´Â SecureRandom ¿ÀºêÁ§Æ®¸¦ ¹ÞÀ» ¼ö°¡ ÀÖ½À´Ï´Ù. ÇÊ¿äÇϸé, ƯÁ¤ÀÇ ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍÀÇ Æ¯Á¤ÀÇ ¾Ë°í¸®ÁòÀ» ¿ä±¸ÇÏ´Â Àϵµ °¡´ÉÇÕ´Ï´Ù. ÀÚ¼¼ÇÑ °ÍÀº,getInstance
¸Þ¼µå¸¦ ÂüÁ¶ÇϽʽÿÀ.
SecureRandom ¿ÀºêÁ§Æ®¸¦ ¿ä±¸ÇÏ·Á¸é 2 °³ÀÇ ¹æ¹ýÀÌ ÀÖ½À´Ï´Ù. 1 °³´Â ¾Ë°í¸®ÁòÀÇ À̸§¸¸À» ÁöÁ¤ÇÏ´Â ¹æ¹ý, ÀÌÁ¦(¹ú½á) 1 °³´Â ¾Ë°í¸®ÁòÀÇ À̸§°ú ÆÐŰÁö ÇÁ·Î¹ÙÀÌ´õ¸¦ ÁöÁ¤ÇÏ´Â ¹æ¹ýÀÔ´Ï´Ù.
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");½Ã½ºÅÛÀº, ¿ä±¸µÈ ¾Ë°í¸®Áò¿¡ ´ëÇØ¼ ȯ°æ¾È¿¡ »ç¿ë °¡´ÉÇÑ ±¸ÇöÀÌ ÀÖÀ»Áö ¾î¶³Áö¸¦ ÆÇ´ÜÇÕ´Ï´Ù. ¶Ç, ´Ù¼ö ÀÖ´Â °æ¿ì¿¡´Â ¿ì¼± ¼øÀ§ÀÇ ³ôÀº °ÍÀÌ ÀÖÀ»Áö ¾î¶³Áöµµ ÆÇ´ÜÇÕ´Ï´Ù.
SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");½Ã½ºÅÛÀº, ¿ä±¸µÈ ÆÐŰÁö¿¡ ¾Ë°í¸®ÁòÀÇ ±¸ÇöÀÌ ÀÖÀ»Áö ¾î¶³Áö¸¦ ÆÇ´ÜÇØ, ±¸ÇöÀÌ ¾ø´Â °æ¿ì´Â ¿¹¿Ü¸¦ Throw ÇÕ´Ï´Ù.
È£ÃâÃøÀÌ, ´ÙÀ½¿¡ ³ªÅ¸³»µµ·Ï(µíÀÌ) getInstance
¸Þ¼µåÀÇ È£ÃâÀÇ °ð ³ªÁß¿¡ setSeed
¸Þ¼µå¸¦ È£ÃâÇÏ´Â °æ¿ì¸¦ Á¦¿ÜÇØ, SecureRandom
±¸ÇöÀº, Á¦³×·¹ÀÌÅÍÀÇ ³»ºÎ »óŸ¦ ¿ÏÀüÇÏ°Ô ·£´ýÀ¸·Î ÇÏ·Á°í ½ÃµµÇÕ´Ï´Ù.
SecureRandom random = SecureRandom.getInstance("SHA1PRNG"); random.setSeed(seed);
È£ÃâÃøÀº,getInstance
È£Ãâ¿¡
ÇØ SecureRandom¸¦
ÃëµæÇÑ µÚ,nextBytes
¸¦
È£ÃâÇØ ³¼ö ¹ÙÀÌÆ®¸¦ »ý¼ºÇÒ ¼ö ÀÖ½À´Ï´Ù.
byte bytes[] = new byte[20]; random.nextBytes(bytes);
È£ÃâÃøÀº, ´ÙÀ½ÀÇ ¿¹ÀÇ °°°Ô generateSeed
¸Þ¼µå¸¦ È£ÃâÇØ, ÁöÁ¤µÈ ¼öÀÇ ¹èÁ¤ ¹ÙÀÌÆ®¸¦ »ý¼ºÇÒ ¼öµµ ÀÖ½À´Ï´Ù. »ý¼ºÇÑ ¹èÁ¤ ¹ÙÀÌÆ®´Â
´Ù¸¥ ³¼ö Á¦³×·¹ÀÌÅ͸¦ ¹èÁ¤ ÇÏ´Â µîÀ» À§Çؼ »ç¿ëÇÕ´Ï´Ù.
byte seed[] = random.generateSeed(20);
SecureRandomSpi
,
Random
,
Á÷·ÄÈ µÈ Çü½Ä »ý¼ºÀÚ °³¿ä | |
---|---|
|
SecureRandom ()
ÀÌ »ý¼ºÀÚ¸¦ »ç¿ëÇϸé, È£ÃâÃøÀº, ±¸ÇöµÈ SecureRandom¸¦ °¡Áö°í ÀÖ´Â ÀνºÅç ³¡³ ±× Áß¿¡¼, °¡Àå ¿ì¼±µµÀÇ ³ôÀº ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍ, SecureRandom ¿ÀºêÁ§Æ®¿Í ±× ±¸Çö Äڵ带 ÃëµæÇÒ ¼ö ÀÖ½À´Ï´Ù. |
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SecureRandom (byte[] seed)
ÀÌ »ý¼ºÀÚ¸¦ »ç¿ëÇϸé, È£ÃâÃøÀº, ±¸ÇöµÈ SecureRandom¸¦ °¡Áö°í ÀÖ´Â ÀνºÅç ³¡³ ±× Áß¿¡¼ ¿Íµµ ¿ì¼±µµÀÇ ³ôÀº ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍ, SecureRandom ¿ÀºêÁ§Æ®¿Í ±× ±¸Çö Äڵ带 ÃëµæÇÒ ¼ö ÀÖ½À´Ï´Ù. |
protected |
SecureRandom (SecureRandomSpi secureRandomSpi,
Provider provider)
SecureRandom ¿ÀºêÁ§Æ®¸¦ ÀÛ¼ºÇÕ´Ï´Ù. |
¸Þ¼µå °³¿ä | |
---|---|
byte[] |
generateSeed (int numBytes)
ÁöÁ¤µÈ ¹ÙÀÌÆ®¼öÀÇ ¹èÁ¤ ¹ÙÀÌÆ®¸¦ µ¹·ÁÁÝ´Ï´Ù. |
String |
getAlgorithm ()
ÀÌ SecureRandom ¿ÀºêÁ§Æ®°¡ ±¸ÇöÇϰí ÀÖ´Â ¾Ë°í¸®ÁòÀÇ À̸§À» µ¹·ÁÁÝ´Ï´Ù. |
static SecureRandom |
getInstance (String algorithm)
ÁöÁ¤µÈ ³¼ö Á¦³×·¹ÀÌÅÍ (RNG) ¾Ë°í¸®ÁòÀ» ±¸ÇöÇÑ SecureRandom ¿ÀºêÁ§Æ®¸¦ ÀÛ¼ºÇÕ´Ï´Ù. |
static SecureRandom |
getInstance (String algorithm,
Provider provider)
ÁöÁ¤µÈ RNG ¾Ë°í¸®Áò¿¡ ÇÑ SecureRandom ¿ÀºêÁ§Æ®¸¦ ÀÛ¼ºÇÕ´Ï´Ù. |
static SecureRandom |
getInstance (String algorithm,
String provider)
ÁöÁ¤µÈ RNG ¾Ë°í¸®Áò¿¡ ´ëÇÑ SecureRandom ¿ÀºêÁ§Æ®¸¦ ÀÛ¼ºÇÕ´Ï´Ù. |
Provider |
getProvider ()
ÀÌ SecureRandom ¿ÀºêÁ§Æ®ÀÇ ÇÁ·Î¹ÙÀÌ´õ¸¦ µ¹·ÁÁÝ´Ï´Ù. |
static byte[] |
getSeed (int numBytes)
ÁöÁ¤µÈ ¹ÙÀÌÆ®¼öÀÇ ¹èÁ¤ ¹ÙÀÌÆ®¸¦ µ¹·ÁÁÝ´Ï´Ù. |
protected int |
next (int numBits)
À¯Àú°¡ ÁöÁ¤ÇÑ ¼öÀÇ À¯»ç ³¼ö ºñÆ® (right justify, Á¦·Î ¸ÅÀÔ)¸¦ Æ÷ÇÔÇÑ Á¤¼ö¸¦ »ý¼ºÇÕ´Ï´Ù. |
void |
nextBytes (byte[] bytes)
À¯Àú°¡ ÁöÁ¤ÇÑ ¹ÙÀÌÆ®¼öÀÇ ³¼ö ¹ÙÀÌÆ®¸¦ »ý¼ºÇÕ´Ï´Ù. |
void |
setSeed (byte[] seed)
³¼ö ¿ÀºêÁ§Æ®¸¦ Àç¹èÁ¤ ÇÕ´Ï´Ù. |
void |
setSeed (long seed)
ÁöÁ¤µÈ long seed ¿¡ Æ÷ÇԵǾî ÀÖ´Â 8 ¹ÙÀÌÆ®¸¦ »ç¿ëÇØ, ÀÌ ³¼ö ¿ÀºêÁ§Æ®¸¦ Àç¹èÁ¤ ÇÕ´Ï´Ù. |
Ŭ·¡½º java.util. Random ·ÎºÎÅÍ »ó¼ÓµÈ ¸Þ¼µå |
---|
nextBoolean,
nextDouble,
nextFloat,
nextGaussian,
nextInt,
nextInt,
nextLong |
Ŭ·¡½º java.lang. Object ·ÎºÎÅÍ »ó¼ÓµÈ ¸Þ¼µå |
---|
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
»ý¼ºÀÚ »ó¼¼ |
---|
public SecureRandom()
ÀÌ »ý¼ºÀÚ¸¦ »ç¿ëÇϸé, È£ÃâÃøÀº, ±¸ÇöµÈ SecureRandom¸¦ °¡Áö°í ÀÖ´Â ÀνºÅç ³¡³ ±× Áß¿¡¼, °¡Àå ¿ì¼±µµÀÇ ³ôÀº ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍ, SecureRandom ¿ÀºêÁ§Æ®¿Í ±× ±¸Çö Äڵ带 ÃëµæÇÒ ¼ö ÀÖ½À´Ï´Ù.
ÀÌ SecureRandom
ÀνºÅϽº´Â ¹èÁ¤ µÇ°í ÀÖÁö ¾Ê½À´Ï´Ù. SecureRandom ¿ÀºêÁ§Æ®¸¦ ¹èÁ¤ ÇÏ·Á¸é,
setSeed
¸Þ¼µå¸¦ È£ÃâÇÕ´Ï´Ù. setSeed
°¡ ºÒ·Á °¡Áö ¾Ê¾Ò´ø °æ¿ì´Â
ÃÖÃÊ·Î nextBytes
¸Þ¼µå¸¦ È£ÃâÇßÀ» ¶§¿¡
SecureRandom ¿ÀºêÁ§Æ®°¡ ±×°Í ÀÚ½ÅÀ» ¹èÁ¤ ÇÏ´Â °ÍÀ» °Á¦ÇÕ´Ï´Ù.
ÀÌ »ý¼ºÀÚ´Â
ÇÏÀ§ ȣȯÀ» À§Çؼ Á¦°øµÇ°í ÀÖ½À´Ï´Ù. È£ÃâÃøÀ¸·ÎºÎÅÍ´Â
´ëüÀÇ getInstance
¸Þ¼µå °¡¿îµ¥ 1 °³¸¦ »ç¿ëÇØ SecureRandom ¿ÀºêÁ§Æ®¸¦ ¾ò´Â
°ÍÀ» ÃßõÇÕ´Ï´Ù.
public SecureRandom(byte[] seed)
ÀÌ »ý¼ºÀÚ¸¦ »ç¿ëÇϸé, È£ÃâÃøÀº, ±¸ÇöµÈ SecureRandom¸¦ °¡Áö°í ÀÖ´Â ÀνºÅç ³¡³ ±× Áß¿¡¼ ¿Íµµ ¿ì¼±µµÀÇ ³ôÀº ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍ, SecureRandom ¿ÀºêÁ§Æ®¿Í ±× ±¸Çö Äڵ带 ÃëµæÇÒ ¼ö ÀÖ½À´Ï´Ù. ÀÌ »ý¼ºÀÚ´Â Àμö ¾øÀ½ÀÇ »ý¼ºÀÚ ±â¼ú¿¡ ÇØ ÂüÁ¶µÇ´Â ¾Ë°í¸®ÁòÀÇ Àڱ⠹èÁ¤º¸´Ù, À¯Àú¿¡°Ô Á¦°øµÈ ¹èÁ¤À» ¿ì¼±ÇØ »ç¿ëÇÕ´Ï´Ù. È£ÃâÃøÀÌ ÇϵîÀÇ ¹°¸® µð¹ÙÀ̽º·ÎºÎÅÍÀÇ °íǰÁúÀÎ ³¼ö ¹ÙÀÌÆ®¿¡ ¾×¼¼½º ÇÒ ¼ö ÀÖ´Â °æ¿ì´Â Àμö ¾øÀ½ÀÇ »ý¼ºÀÚ º¸´Ù ÀÌ »ý¼ºÀÚ¸¦ »ç¿ëÇÏ´Â °ÍÀ» ÃßõÇÕ´Ï´Ù.
ÀÌ »ý¼ºÀÚ´Â
ÇÏÀ§ ȣȯÀ» À§Çؼ Á¦°øµÇ°í ÀÖ½À´Ï´Ù. È£ÃâÃøÀ¸·ÎºÎÅÍ´Â
´ëüÀÇ getInstance
¸Þ¼µå °¡¿îµ¥ 1 °³¸¦ »ç¿ëÇØ SecureRandom ¿ÀºêÁ§Æ®¸¦ ÃëµæÇÑ °ð ³ªÁß¿¡
setSeed
¸Þ¼µå¸¦ È£ÃâÇØ ¹èÁ¤ ÇÏ´Â °ÍÀ» ÃßõÇÕ´Ï´Ù.
seed
- ¹èÁ¤protected SecureRandom(SecureRandomSpi secureRandomSpi, Provider provider)
secureRandomSpi
- SecureRandom
±¸Çöprovider
- ÇÁ·Î¹ÙÀÌ´õ¸Þ¼µåÀÇ »ó¼¼ |
---|
public static SecureRandom getInstance(String algorithm) throws NoSuchAlgorithmException
µ¹·ÁÁÖ°íÁø SecureRandom
ÀνºÅϽº´Â ¹èÁ¤ µÇ°í ÀÖÁö ¾Ê½À´Ï´Ù. SecureRandom ¿ÀºêÁ§Æ®¸¦ ¹èÁ¤ ÇÏ·Á¸é,
setSeed
¸Þ¼µå¸¦ È£ÃâÇÕ´Ï´Ù. setSeed
°¡ ºÒ·Á °¡Áö ¾Ê¾Ò´ø °æ¿ì´Â
ÃÖÃÊ·Î nextBytes
¸Þ¼µå¸¦ È£ÃâÇßÀ» ¶§¿¡
SecureRandom ¿ÀºêÁ§Æ®°¡ ±×°Í ÀÚ½ÅÀ» ¹èÁ¤ ÇÏ´Â °ÍÀ» °Á¦ÇÕ´Ï´Ù.
algorithm
- RNG ¾Ë°í¸®ÁòÀÇ À̸§. RNG ¾Ë°í¸®ÁòÀÇ Ç¥ÁØÀûÀÎ À̸§¿¡ ´ëÇØ¼´Â
¡¸Java ¾ÏÈ£È ¾ÆÅ°ÅØÃÄ API
»ç¾ç ¹× ·¹ÆÛ·±½º¡¹ÀÇ ºÎ·Ï A¸¦
ÂüÁ¶
NoSuchAlgorithmException
- RNG ¾Ë°í¸®ÁòÀÌ È£ÃâÇØ ¿·ÀÇ È¯°æ¿¡¼ »ç¿ë °¡´ÉÇÏÁö ¾ÊÀº °æ¿ìpublic static SecureRandom getInstance(String algorithm, String provider) throws NoSuchAlgorithmException, NoSuchProviderException
µ¹·ÁÁÖ°íÁø SecureRandom
ÀνºÅϽº´Â ¹èÁ¤ µÇ°í ÀÖÁö ¾Ê½À´Ï´Ù. SecureRandom ¿ÀºêÁ§Æ®¸¦ ¹èÁ¤ ÇÏ·Á¸é,
setSeed
¸Þ¼µå¸¦ È£ÃâÇÕ´Ï´Ù. setSeed
°¡ ºÒ·Á °¡Áö ¾Ê¾Ò´ø °æ¿ì´Â
ÃÖÃÊ·Î nextBytes
¸Þ¼µå¸¦ È£ÃâÇßÀ» ¶§¿¡
SecureRandom ¿ÀºêÁ§Æ®°¡ ±×°Í ÀÚ½ÅÀ» ¹èÁ¤ ÇÏ´Â °ÍÀ» °Á¦ÇÕ´Ï´Ù.
algorithm
- RNG ¾Ë°í¸®ÁòÀÇ À̸§. RNG ¾Ë°í¸®ÁòÀÇ Ç¥ÁØÀûÀÎ À̸§¿¡ ´ëÇØ¼´Â
¡¸Java ¾ÏÈ£È ¾ÆÅ°ÅØÃÄ API
»ç¾ç ¹× ·¹ÆÛ·±½º¡¹ÀÇ ºÎ·Ï A¸¦
ÂüÁ¶provider
- ÇÁ·Î¹ÙÀÌ´õ¸í
NoSuchAlgorithmException
- ¿ä±¸µÈ RNG
±¸ÇöÀÌ ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍ ÀÌ¿ëÇÒ ¼ö ¾ø´Â °æ¿ì
NoSuchProviderException
- ÇÁ·Î¹ÙÀÌ´õ°¡ ¼³Á¤µÇ¾î ÀÖÁö ¾ÊÀº °æ¿ì
IllegalArgumentException
- ÇÁ·Î¹ÙÀÌ´õÀÇ À̸§ÀÌ null ³ª ÇÏ´ÃÀÇ °æ¿ìProvider
public static SecureRandom getInstance(String algorithm, Provider provider) throws NoSuchAlgorithmException
provider
¸¦
µî·ÏÇÒ ÇÊ¿ä´Â ¾ø½À´Ï´Ù.
µ¹·ÁÁÖ°íÁø SecureRandom
ÀνºÅϽº´Â ¹èÁ¤ µÇ°í ÀÖÁö ¾Ê½À´Ï´Ù. SecureRandom ¿ÀºêÁ§Æ®¸¦ ¹èÁ¤ ÇÏ·Á¸é,
setSeed
¸Þ¼µå¸¦ È£ÃâÇÕ´Ï´Ù. setSeed
°¡ ºÒ·Á °¡Áö ¾Ê¾Ò´ø °æ¿ì´Â
ÃÖÃÊ·Î nextBytes
¸Þ¼µå¸¦ È£ÃâÇßÀ» ¶§¿¡
SecureRandom ¿ÀºêÁ§Æ®°¡ ±×°Í ÀÚ½ÅÀ» ¹èÁ¤ ÇÏ´Â °ÍÀ» °Á¦ÇÕ´Ï´Ù.
algorithm
- RNG ¾Ë°í¸®ÁòÀÇ À̸§. RNG ¾Ë°í¸®ÁòÀÇ Ç¥ÁØÀûÀÎ À̸§¿¡ ´ëÇØ¼´Â
¡¸Java ¾ÏÈ£È ¾ÆÅ°ÅØÃÄ API
»ç¾ç ¹× ·¹ÆÛ·±½º¡¹ÀÇ ºÎ·Ï A¸¦
ÂüÁ¶provider
- ÇÁ·Î¹ÙÀÌ´õ
NoSuchAlgorithmException
- ¿ä±¸µÈ RNG
±¸ÇöÀÌ ÇÁ·Î¹ÙÀÌ´õ·ÎºÎÅÍ ÀÌ¿ëÇÒ ¼ö ¾ø´Â °æ¿ì
IllegalArgumentException
- provider
°¡ null
°æ¿ìProvider
public final Provider getProvider()
public String getAlgorithm()
unknown
public void setSeed(byte[] seed)
seed
- ¹èÁ¤getSeed(int)
public void setSeed(long seed)
long seed
¿¡ Æ÷ÇԵǾî ÀÖ´Â 8 ¹ÙÀÌÆ®¸¦ »ç¿ëÇØ, ÀÌ ³¼ö ¿ÀºêÁ§Æ®¸¦ Àç¹èÁ¤ ÇÕ´Ï´Ù. ÁöÁ¤µÈ ¹èÁ¤Àº, ±âÁ¸ÀÇ ¹èÁ¤À» ¿Å°Ü³õ´Â °ÍÀº ¾Æ´Ï°Ô º¸ÃæÇÏ´Â °ÍÀÔ´Ï´Ù. µû¶ó¼, È£ÃâÀ» ¹Ýº¹Çصµ, ³¼ö°¡ °¨¼ÒÇÏÁö ¾Ê´Â °ÍÀÌ º¸ÁõµÇ°í ÀÖ½À´Ï´Ù.
ÀÌ ¸Þ¼µå´Â
java.util.Random
¿ÍÀÇ È£È¯¼ºÀ» À§Çؼ Á¤Àǵǰí ÀÖ½À´Ï´Ù.
Random
³»ÀÇ setSeed
seed
- ¹èÁ¤getSeed(int)
public void nextBytes(byte[] bytes)
Random
³»ÀÇ nextBytes
bytes
- ³¼ö ¹ÙÀÌÆ®¸¦ ÃæÀüÇÏ´Â ¹è¿protected final int next(int numBits)
java.util.Random
¸Þ¼µå¸¦ ¿À¹ö¶óÀ̵å(override) ÇØ, ±× Ŭ·¡½º (¿¹¸¦ µé¾î,nextInt
,nextLong
¹× nextFloat
)·ÎºÎÅÍ »ó¼ÓÇÏ´Â ¸Þ¼µåÀÇ ¸ðµÎ¿¡°Ô ³¼ö ºñÆ®ÀÇ ¹ß»ý¿øÀ» Á¦°øÇϴµ¥ µµ¿òÀÌ µË´Ï´Ù.
Random
³»ÀÇ next
numBits
- 0 <= numBits
<= 32
°æ¿ì, »ý¼ºÇÏ´Â À¯»ç ³¼ö ºñÆ®ÀÇ ¼ö
int
public static byte[] getSeed(int numBytes)
ÀÌ ¸Þ¼µå´Â
ÇÏÀ§ ȣȯ À§Çؼ¸¸ Á¦°øµÇ°í ÀÖ½À´Ï´Ù. È£ÃâÃøÀ¸·ÎºÎÅÍ´Â
´ëüÀÇ getInstance
¸Þ¼µå °¡¿îµ¥ 1 °³¸¦ »ç¿ëÇØ SecureRandom ¿ÀºêÁ§Æ®¸¦ ÃëµæÇÑ °ð ³ªÁß¿¡
setSeed
¸Þ¼µå¸¦ È£ÃâÇØ ±× ¿ÀºêÁ§Æ®·ÎºÎÅÍ ¹èÁ¤ ¹ÙÀÌÆ®¸¦ ¾ò´Â
°ÍÀ» ÃßõÇÕ´Ï´Ù.
numBytes
- »ý¼ºÇÏ´Â ¹èÁ¤ ¹ÙÀÌÆ®¼ö
setSeed(byte[])
public byte[] generateSeed(int numBytes)
numBytes
- »ý¼ºÇÏ´Â ¹èÁ¤ ¹ÙÀÌÆ®¼ö
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JavaTM 2 Platform Standard Ed. 5.0 |
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ÀÌÀü Ŭ·¡½º ´ÙÀ½ Ŭ·¡½º | ÇÁ·¹ÀÓÀ¸·Î ÇÁ·¹ÀÓ ¾øÀÌ | |||||||||
°³¿ä: NESTED | Çʵå | constructor | ¸Þ¼µå | »ó¼¼: Çʵå | »ý¼ºÀÚ | ¸Þ¼µå |
Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms . Documentation Redistribution Policy µµ ÂüÁ¶ÇϽʽÿÀ.