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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.
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package org.spongycastle.tls.crypto;

import java.math.BigInteger;

import org.spongycastle.util.encoders.Hex;

/**
 * A selection of standard groups for SRP-6.
 */
public class SRP6StandardGroups
{
    private static BigInteger fromHex(String hex)
    {
        return new BigInteger(1, Hex.decode(hex));
    }

    private static SRP6Group fromNG(String hexN, String hexG)
    {
        return new SRP6Group(fromHex(hexN), fromHex(hexG));
    }

    /*
     * RFC 5054
     */
    private static final String rfc5054_1024_N = "EEAF0AB9ADB38DD69C33F80AFA8FC5E86072618775FF3C0B9EA2314C"
        + "9C256576D674DF7496EA81D3383B4813D692C6E0E0D5D8E250B98BE4"
        + "8E495C1D6089DAD15DC7D7B46154D6B6CE8EF4AD69B15D4982559B29"
        + "7BCF1885C529F566660E57EC68EDBC3C05726CC02FD4CBF4976EAA9A" + "FD5138FE8376435B9FC61D2FC0EB06E3";
    private static final String rfc5054_1024_g = "02";
    public static final SRP6Group rfc5054_1024 = fromNG(rfc5054_1024_N, rfc5054_1024_g);

    private static final String rfc5054_1536_N = "9DEF3CAFB939277AB1F12A8617A47BBBDBA51DF499AC4C80BEEEA961"
        + "4B19CC4D5F4F5F556E27CBDE51C6A94BE4607A291558903BA0D0F843"
        + "80B655BB9A22E8DCDF028A7CEC67F0D08134B1C8B97989149B609E0B"
        + "E3BAB63D47548381DBC5B1FC764E3F4B53DD9DA1158BFD3E2B9C8CF5"
        + "6EDF019539349627DB2FD53D24B7C48665772E437D6C7F8CE442734A"
        + "F7CCB7AE837C264AE3A9BEB87F8A2FE9B8B5292E5A021FFF5E91479E"
        + "8CE7A28C2442C6F315180F93499A234DCF76E3FED135F9BB";
    private static final String rfc5054_1536_g = "02";
    public static final SRP6Group rfc5054_1536 = fromNG(rfc5054_1536_N, rfc5054_1536_g);

    private static final String rfc5054_2048_N = "AC6BDB41324A9A9BF166DE5E1389582FAF72B6651987EE07FC319294"
        + "3DB56050A37329CBB4A099ED8193E0757767A13DD52312AB4B03310D"
        + "CD7F48A9DA04FD50E8083969EDB767B0CF6095179A163AB3661A05FB"
        + "D5FAAAE82918A9962F0B93B855F97993EC975EEAA80D740ADBF4FF74"
        + "7359D041D5C33EA71D281E446B14773BCA97B43A23FB801676BD207A"
        + "436C6481F1D2B9078717461A5B9D32E688F87748544523B524B0D57D"
        + "5EA77A2775D2ECFA032CFBDBF52FB3786160279004E57AE6AF874E73"
        + "03CE53299CCC041C7BC308D82A5698F3A8D0C38271AE35F8E9DBFBB6"
        + "94B5C803D89F7AE435DE236D525F54759B65E372FCD68EF20FA7111F" + "9E4AFF73";
    private static final String rfc5054_2048_g = "02";
    public static final SRP6Group rfc5054_2048 = fromNG(rfc5054_2048_N, rfc5054_2048_g);

    private static final String rfc5054_3072_N = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
        + "8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
        + "302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
        + "A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
        + "49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
        + "FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
        + "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
        + "180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
        + "3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
        + "04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
        + "B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
        + "1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
        + "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC" + "E0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF";
    private static final String rfc5054_3072_g = "05";
    public static final SRP6Group rfc5054_3072 = fromNG(rfc5054_3072_N, rfc5054_3072_g);

    private static final String rfc5054_4096_N = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
        + "8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
        + "302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
        + "A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
        + "49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
        + "FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
        + "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
        + "180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
        + "3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
        + "04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
        + "B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
        + "1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
        + "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
        + "E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
        + "99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
        + "04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
        + "233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
        + "D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199" + "FFFFFFFFFFFFFFFF";
    private static final String rfc5054_4096_g = "05";
    public static final SRP6Group rfc5054_4096 = fromNG(rfc5054_4096_N, rfc5054_4096_g);

    private static final String rfc5054_6144_N = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
        + "8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
        + "302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
        + "A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
        + "49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
        + "FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
        + "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
        + "180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
        + "3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
        + "04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
        + "B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
        + "1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
        + "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
        + "E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
        + "99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
        + "04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
        + "233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
        + "D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934028492"
        + "36C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BDF8FF9406"
        + "AD9E530EE5DB382F413001AEB06A53ED9027D831179727B0865A8918"
        + "DA3EDBEBCF9B14ED44CE6CBACED4BB1BDB7F1447E6CC254B33205151"
        + "2BD7AF426FB8F401378CD2BF5983CA01C64B92ECF032EA15D1721D03"
        + "F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E59E7C97F"
        + "BEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA"
        + "CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58B"
        + "B7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632"
        + "387FE8D76E3C0468043E8F663F4860EE12BF2D5B0B7474D6E694F91E" + "6DCC4024FFFFFFFFFFFFFFFF";
    private static final String rfc5054_6144_g = "05";
    public static final SRP6Group rfc5054_6144 = fromNG(rfc5054_6144_N, rfc5054_6144_g);

    private static final String rfc5054_8192_N = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
        + "8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
        + "302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
        + "A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
        + "49286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8"
        + "FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D"
        + "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C"
        + "180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718"
        + "3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D"
        + "04507A33A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7D"
        + "B3970F85A6E1E4C7ABF5AE8CDB0933D71E8C94E04A25619DCEE3D226"
        + "1AD2EE6BF12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
        + "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB3143DB5BFC"
        + "E0FD108E4B82D120A92108011A723C12A787E6D788719A10BDBA5B26"
        + "99C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8DBBBC2DB"
        + "04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2"
        + "233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127"
        + "D5B05AA993B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934028492"
        + "36C3FAB4D27C7026C1D4DCB2602646DEC9751E763DBA37BDF8FF9406"
        + "AD9E530EE5DB382F413001AEB06A53ED9027D831179727B0865A8918"
        + "DA3EDBEBCF9B14ED44CE6CBACED4BB1BDB7F1447E6CC254B33205151"
        + "2BD7AF426FB8F401378CD2BF5983CA01C64B92ECF032EA15D1721D03"
        + "F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E59E7C97F"
        + "BEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA"
        + "CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58B"
        + "B7C5DA76F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632"
        + "387FE8D76E3C0468043E8F663F4860EE12BF2D5B0B7474D6E694F91E"
        + "6DBE115974A3926F12FEE5E438777CB6A932DF8CD8BEC4D073B931BA"
        + "3BC832B68D9DD300741FA7BF8AFC47ED2576F6936BA424663AAB639C"
        + "5AE4F5683423B4742BF1C978238F16CBE39D652DE3FDB8BEFC848AD9"
        + "22222E04A4037C0713EB57A81A23F0C73473FC646CEA306B4BCBC886"
        + "2F8385DDFA9D4B7FA2C087E879683303ED5BDD3A062B3CF5B3A278A6"
        + "6D2A13F83F44F82DDF310EE074AB6A364597E899A0255DC164F31CC5"
        + "0846851DF9AB48195DED7EA1B1D510BD7EE74D73FAF36BC31ECFA268"
        + "359046F4EB879F924009438B481C6CD7889A002ED5EE382BC9190DA6"
        + "FC026E479558E4475677E9AA9E3050E2765694DFC81F56E880B96E71" + "60C980DD98EDD3DFFFFFFFFFFFFFFFFF";
    private static final String rfc5054_8192_g = "13";
    public static final SRP6Group rfc5054_8192 = fromNG(rfc5054_8192_N, rfc5054_8192_g);
}