org.bouncycastle.tls.NamedGroup Maven / Gradle / Ivy
Show all versions of bctls-jdk15on Show documentation
package org.bouncycastle.tls;
/**
* RFC 7919
*/
public class NamedGroup
{
/*
* RFC 4492 5.1.1
*
* The named curves defined here are those specified in SEC 2 [13]. Note that many of these curves
* are also recommended in ANSI X9.62 [7] and FIPS 186-2 [11]. Values 0xFE00 through 0xFEFF are
* reserved for private use. Values 0xFF01 and 0xFF02 indicate that the client supports arbitrary
* prime and characteristic-2 curves, respectively (the curve parameters must be encoded explicitly
* in ECParameters).
*/
public static final int sect163k1 = 1;
public static final int sect163r1 = 2;
public static final int sect163r2 = 3;
public static final int sect193r1 = 4;
public static final int sect193r2 = 5;
public static final int sect233k1 = 6;
public static final int sect233r1 = 7;
public static final int sect239k1 = 8;
public static final int sect283k1 = 9;
public static final int sect283r1 = 10;
public static final int sect409k1 = 11;
public static final int sect409r1 = 12;
public static final int sect571k1 = 13;
public static final int sect571r1 = 14;
public static final int secp160k1 = 15;
public static final int secp160r1 = 16;
public static final int secp160r2 = 17;
public static final int secp192k1 = 18;
public static final int secp192r1 = 19;
public static final int secp224k1 = 20;
public static final int secp224r1 = 21;
public static final int secp256k1 = 22;
public static final int secp256r1 = 23;
public static final int secp384r1 = 24;
public static final int secp521r1 = 25;
/*
* RFC 7027
*/
public static final int brainpoolP256r1 = 26;
public static final int brainpoolP384r1 = 27;
public static final int brainpoolP512r1 = 28;
/*
* RFC 7919 2. Codepoints in the "Supported Groups Registry" with a high byte of 0x01 (that is,
* between 256 and 511, inclusive) are set aside for FFDHE groups, though only a small number of
* them are initially defined and we do not expect many other FFDHE groups to be added to this
* range. No codepoints outside of this range will be allocated to FFDHE groups.
*/
public static final int ffdhe2048 = 256;
public static final int ffdhe3072 = 257;
public static final int ffdhe4096 = 258;
public static final int ffdhe6144 = 259;
public static final int ffdhe8192 = 260;
/*
* RFC 4492 reserved (0xFE00..0xFEFF)
*/
/*
* RFC 4492
*/
public static final int arbitrary_explicit_prime_curves = 0xFF01;
public static final int arbitrary_explicit_char2_curves = 0xFF02;
private static final String[] CURVE_NAMES = new String[] { "sect163k1", "sect163r1", "sect163r2", "sect193r1",
"sect193r2", "sect233k1", "sect233r1", "sect239k1", "sect283k1", "sect283r1", "sect409k1", "sect409r1",
"sect571k1", "sect571r1", "secp160k1", "secp160r1", "secp160r2", "secp192k1", "secp192r1", "secp224k1",
"secp224r1", "secp256k1", "secp256r1", "secp384r1", "secp521r1",
"brainpoolP256r1", "brainpoolP384r1", "brainpoolP512r1"};
private static final String[] FINITE_FIELD_NAMES = new String[] { "ffdhe2048", "ffdhe3072", "ffdhe4096", "ffdhe6144", "ffdhe8192" };
public static int getCurveBits(int namedGroup)
{
switch (namedGroup)
{
case secp160k1:
case secp160r1:
case secp160r2:
return 160;
case sect163k1:
case sect163r1:
case sect163r2:
return 163;
case secp192k1:
case secp192r1:
return 192;
case sect193r1:
case sect193r2:
return 193;
case secp224k1:
case secp224r1:
return 224;
case sect233k1:
case sect233r1:
return 233;
case sect239k1:
return 239;
case brainpoolP256r1:
case secp256k1:
case secp256r1:
return 256;
case sect283k1:
case sect283r1:
return 283;
case brainpoolP384r1:
case secp384r1:
return 384;
case sect409k1:
case sect409r1:
return 409;
case brainpoolP512r1:
return 512;
case secp521r1:
return 521;
case sect571k1:
case sect571r1:
return 571;
default:
return 0;
}
}
public static int getFiniteFieldBits(int namedGroup)
{
switch (namedGroup)
{
case ffdhe2048:
return 2048;
case ffdhe3072:
return 3072;
case ffdhe4096:
return 4096;
case ffdhe6144:
return 6144;
case ffdhe8192:
return 8192;
default:
return 0;
}
}
public static int getMaximumCurveBits()
{
return 571;
}
public static int getMaximumFiniteFieldBits()
{
return 8192;
}
public static String getName(int namedGroup)
{
if ((namedGroup & 0xFFFFFF00) == 0xFE00)
{
return "PRIVATE";
}
if (namedGroup >= sect163k1 && namedGroup <= brainpoolP512r1)
{
return CURVE_NAMES[namedGroup - sect163k1];
}
if (namedGroup >= ffdhe2048 && namedGroup <= ffdhe8192)
{
return FINITE_FIELD_NAMES[namedGroup - ffdhe2048];
}
switch (namedGroup)
{
case arbitrary_explicit_prime_curves:
return "arbitrary_explicit_prime_curves";
case arbitrary_explicit_char2_curves:
return "arbitrary_explicit_char2_curves";
default:
return "UNKNOWN";
}
}
public static String getText(int namedGroup)
{
return getName(namedGroup) + "(" + namedGroup + ")";
}
public static boolean isChar2Curve(int namedGroup)
{
return (namedGroup >= sect163k1 && namedGroup <= sect571r1)
|| (namedGroup == arbitrary_explicit_char2_curves);
}
public static boolean isPrimeCurve(int namedGroup)
{
return (namedGroup >= secp160k1 && namedGroup <= brainpoolP512r1)
|| (namedGroup == arbitrary_explicit_prime_curves);
}
public static boolean isPrivate(int namedGroup)
{
return (namedGroup & 0xFFFFFF00) == 0xFE00;
}
public static boolean isValid(int namedGroup)
{
return (namedGroup >= sect163k1 && namedGroup <= brainpoolP512r1)
|| ((namedGroup & 0xFFFFFF00) == 0xFE00)
|| (namedGroup >= arbitrary_explicit_prime_curves && namedGroup <= arbitrary_explicit_char2_curves);
}
public static boolean refersToASpecificCurve(int namedGroup)
{
return namedGroup >= sect163k1 && namedGroup <= brainpoolP512r1;
}
public static boolean refersToASpecificFiniteField(int namedGroup)
{
return namedGroup >= ffdhe2048 && namedGroup <= ffdhe8192;
}
public static boolean refersToASpecificGroup(int namedGroup)
{
return (namedGroup >= sect163k1 && namedGroup <= brainpoolP512r1)
|| (namedGroup >= ffdhe2048 && namedGroup <= ffdhe8192);
}
}