diff options
Diffstat (limited to 'pki/base/util/src/netscape/security/util/BigInt.java')
| -rw-r--r-- | pki/base/util/src/netscape/security/util/BigInt.java | 214 |
1 files changed, 109 insertions, 105 deletions
diff --git a/pki/base/util/src/netscape/security/util/BigInt.java b/pki/base/util/src/netscape/security/util/BigInt.java index 10e4569d..9cfbb02c 100644 --- a/pki/base/util/src/netscape/security/util/BigInt.java +++ b/pki/base/util/src/netscape/security/util/BigInt.java @@ -19,180 +19,184 @@ package netscape.security.util; import java.math.BigInteger; - /** - * A low-overhead arbitrary-precision <em>unsigned</em> integer. - * This is intended for use with ASN.1 parsing, and printing of - * such parsed values. Convert to "BigInteger" if you need to do - * arbitrary precision arithmetic, rather than just represent - * the number as a wrapped array of bytes. - * - * <P><em><b>NOTE:</b> This class may eventually disappear, to + * A low-overhead arbitrary-precision <em>unsigned</em> integer. This is + * intended for use with ASN.1 parsing, and printing of such parsed values. + * Convert to "BigInteger" if you need to do arbitrary precision arithmetic, + * rather than just represent the number as a wrapped array of bytes. + * + * <P> + * <em><b>NOTE:</b> This class may eventually disappear, to * be supplanted by big-endian byte arrays which hold both signed * and unsigned arbitrary-precision integers. - * + * * @version 1.23 * @author David Brownell */ public final class BigInt { // Big endian -- MSB first. - private byte[] places; + private byte[] places; /** - * Constructs a "Big" integer from a set of (big-endian) bytes. - * Leading zeroes should be stripped off. - * - * @param data a sequence of bytes, most significant bytes/digits - * first. CONSUMED. + * Constructs a "Big" integer from a set of (big-endian) bytes. Leading + * zeroes should be stripped off. + * + * @param data a sequence of bytes, most significant bytes/digits first. + * CONSUMED. */ - public BigInt(byte[] data) { places = (byte[])data.clone(); } + public BigInt(byte[] data) { + places = (byte[]) data.clone(); + } /** - * Constructs a "Big" integer from a "BigInteger", which must be - * positive (or zero) in value. + * Constructs a "Big" integer from a "BigInteger", which must be positive + * (or zero) in value. */ public BigInt(BigInteger i) { - byte[] temp = i.toByteArray(); - - if ((temp [0] & 0x80) != 0) - throw new IllegalArgumentException ("negative BigInteger"); - - // XXX we assume exactly _one_ sign byte is used... - - if (temp [0] != 0) - places = temp; - else { - // Note that if i = new BigInteger("0"), - // i.toByteArray() contains only 1 zero. - if (temp.length == 1) { - places = new byte [1]; - places [0] = (byte) 0; - } else { - places = new byte [temp.length - 1]; - for (int j = 1; j < temp.length; j++) - places [j - 1] = temp [j]; - } - } + byte[] temp = i.toByteArray(); + + if ((temp[0] & 0x80) != 0) + throw new IllegalArgumentException("negative BigInteger"); + + // XXX we assume exactly _one_ sign byte is used... + + if (temp[0] != 0) + places = temp; + else { + // Note that if i = new BigInteger("0"), + // i.toByteArray() contains only 1 zero. + if (temp.length == 1) { + places = new byte[1]; + places[0] = (byte) 0; + } else { + places = new byte[temp.length - 1]; + for (int j = 1; j < temp.length; j++) + places[j - 1] = temp[j]; + } + } } /** * Constructs a "Big" integer from a normal Java integer. - * + * * @param i the java primitive integer */ public BigInt(int i) { - if (i < (1 << 8)) { - places = new byte [1]; - places [0] = (byte) i; - } else if (i < (1 << 16)) { - places = new byte [2]; - places[0] = (byte) (i >> 8); - places[1] = (byte) i; - } else if (i < (1 << 24)) { - places = new byte [3]; - places[0] = (byte) (i >> 16); - places [1] = (byte) (i >> 8); - places[2] = (byte) i; - } else { - places = new byte [4]; - places[0] = (byte) (i >> 24); - places[1] = (byte) (i >> 16); - places[2] = (byte) (i >> 8); - places[3] = (byte) i; - } + if (i < (1 << 8)) { + places = new byte[1]; + places[0] = (byte) i; + } else if (i < (1 << 16)) { + places = new byte[2]; + places[0] = (byte) (i >> 8); + places[1] = (byte) i; + } else if (i < (1 << 24)) { + places = new byte[3]; + places[0] = (byte) (i >> 16); + places[1] = (byte) (i >> 8); + places[2] = (byte) i; + } else { + places = new byte[4]; + places[0] = (byte) (i >> 24); + places[1] = (byte) (i >> 16); + places[2] = (byte) (i >> 8); + places[3] = (byte) i; + } } /** * Converts the "big" integer to a java primitive integer. - * + * * @exception NumberFormatException if 32 bits is insufficient. */ public int toInt() { - if (places.length > 4) - throw new NumberFormatException ("BigInt.toInt, too big"); - int retval = 0, i = 0; + if (places.length > 4) + throw new NumberFormatException("BigInt.toInt, too big"); + int retval = 0, i = 0; for (; i < places.length; i++) - retval = (retval << 8) + ((int)places[i] & 0xff); - return retval; + retval = (retval << 8) + ((int) places[i] & 0xff); + return retval; } /** - * Returns a hexadecimal printed representation. The value is - * formatted to fit on lines of at least 75 characters, with - * embedded newlines. Words are separated for readability, - * with eight words (32 bytes) per line. + * Returns a hexadecimal printed representation. The value is formatted to + * fit on lines of at least 75 characters, with embedded newlines. Words are + * separated for readability, with eight words (32 bytes) per line. */ - public String toString() { return hexify(); } + public String toString() { + return hexify(); + } /** - * Returns a BigInteger value which supports many arithmetic - * operations. Assumes negative values will never occur. + * Returns a BigInteger value which supports many arithmetic operations. + * Assumes negative values will never occur. */ - public BigInteger toBigInteger () - { return new BigInteger(1, places); } + public BigInteger toBigInteger() { + return new BigInteger(1, places); + } /** * Returns the length of the data as a byte array. */ - public int byteLength() { return places.length; } - + public int byteLength() { + return places.length; + } /** - * Returns the data as a byte array. The most significant bit - * of the array is bit zero (as in <code>java.math.BigInteger</code>). + * Returns the data as a byte array. The most significant bit of the array + * is bit zero (as in <code>java.math.BigInteger</code>). */ - public byte [] toByteArray () { + public byte[] toByteArray() { if (places.length == 0) { - byte zero[] = new byte [1]; - zero [0] = (byte) 0; - return zero; - } else { - return (byte [])places.clone(); - } + byte zero[] = new byte[1]; + zero[0] = (byte) 0; + return zero; + } else { + return (byte[]) places.clone(); + } } private static final String digits = "0123456789abcdef"; + private String hexify() { if (places.length == 0) return " 0 "; - StringBuffer buf = new StringBuffer (places.length * 2); - buf.append (" "); // four spaces - for (int i = 0; i < places.length; i++) { - buf.append (digits.charAt ((places [i] >> 4) & 0x0f)); - buf.append (digits.charAt (places [i] & 0x0f)); - if (((i + 1) % 32) == 0) { - if ((i + 1) != places.length) - buf.append ("\n "); // line after four words - } else if (((i + 1) % 4) == 0) - buf.append (' '); // space between words - } - return buf.toString (); + StringBuffer buf = new StringBuffer(places.length * 2); + buf.append(" "); // four spaces + for (int i = 0; i < places.length; i++) { + buf.append(digits.charAt((places[i] >> 4) & 0x0f)); + buf.append(digits.charAt(places[i] & 0x0f)); + if (((i + 1) % 32) == 0) { + if ((i + 1) != places.length) + buf.append("\n "); // line after four words + } else if (((i + 1) % 4) == 0) + buf.append(' '); // space between words + } + return buf.toString(); } /** - * Returns true iff the parameter is a numerically equivalent - * BigInt. - * + * Returns true iff the parameter is a numerically equivalent BigInt. + * * @param other the object being compared with this one. */ public boolean equals(Object other) { - if (other instanceof BigInt) - return equals ((BigInt) other); - return false; + if (other instanceof BigInt) + return equals((BigInt) other); + return false; } /** * Returns true iff the parameter is numerically equivalent. - * + * * @param other the BigInt being compared with this one. */ public boolean equals(BigInt other) { if (this == other) return true; - byte[] otherPlaces = other.toByteArray(); + byte[] otherPlaces = other.toByteArray(); if (places.length != otherPlaces.length) return false; for (int i = 0; i < places.length; i++) |