Source Code Cross Referenced for RSASHA1Verify.java in  » Net » Ganymed-SSH-2 » ch » ethz » ssh2 » signature » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Ganymed SSH 2 » ch.ethz.ssh2.signature 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package ch.ethz.ssh2.signature;
002:
003:        import java.io.IOException;
004:        import java.math.BigInteger;
005:
006:        import ch.ethz.ssh2.crypto.SimpleDERReader;
007:        import ch.ethz.ssh2.crypto.digest.SHA1;
008:        import ch.ethz.ssh2.log.Logger;
009:        import ch.ethz.ssh2.packets.TypesReader;
010:        import ch.ethz.ssh2.packets.TypesWriter;
011:
012:        /**
013:         * RSASHA1Verify.
014:         * 
015:         * @author Christian Plattner, plattner@inf.ethz.ch
016:         * @version $Id: RSASHA1Verify.java,v 1.4 2005/12/07 10:25:49 cplattne Exp $
017:         */
018:        public class RSASHA1Verify {
019:            private static final Logger log = Logger
020:                    .getLogger(RSASHA1Verify.class);
021:
022:            public static RSAPublicKey decodeSSHRSAPublicKey(byte[] key)
023:                    throws IOException {
024:                TypesReader tr = new TypesReader(key);
025:
026:                String key_format = tr.readString();
027:
028:                if (key_format.equals("ssh-rsa") == false)
029:                    throw new IllegalArgumentException(
030:                            "This is not a ssh-rsa public key");
031:
032:                BigInteger e = tr.readMPINT();
033:                BigInteger n = tr.readMPINT();
034:
035:                if (tr.remain() != 0)
036:                    throw new IOException("Padding in RSA public key!");
037:
038:                return new RSAPublicKey(e, n);
039:            }
040:
041:            public static byte[] encodeSSHRSAPublicKey(RSAPublicKey pk)
042:                    throws IOException {
043:                TypesWriter tw = new TypesWriter();
044:
045:                tw.writeString("ssh-rsa");
046:                tw.writeMPInt(pk.getE());
047:                tw.writeMPInt(pk.getN());
048:
049:                return tw.getBytes();
050:            }
051:
052:            public static RSASignature decodeSSHRSASignature(byte[] sig)
053:                    throws IOException {
054:                TypesReader tr = new TypesReader(sig);
055:
056:                String sig_format = tr.readString();
057:
058:                if (sig_format.equals("ssh-rsa") == false)
059:                    throw new IOException("Peer sent wrong signature format");
060:
061:                /* S is NOT an MPINT. "The value for 'rsa_signature_blob' is encoded as a string
062:                 * containing s (which is an integer, without lengths or padding, unsigned and in
063:                 * network byte order)." See also below.
064:                 */
065:
066:                byte[] s = tr.readByteString();
067:
068:                if (s.length == 0)
069:                    throw new IOException("Error in RSA signature, S is empty.");
070:
071:                if (log.isEnabled()) {
072:                    log.log(80, "Decoding ssh-rsa signature string (length: "
073:                            + s.length + ")");
074:                }
075:
076:                if (tr.remain() != 0)
077:                    throw new IOException("Padding in RSA signature!");
078:
079:                return new RSASignature(new BigInteger(1, s));
080:            }
081:
082:            public static byte[] encodeSSHRSASignature(RSASignature sig)
083:                    throws IOException {
084:                TypesWriter tw = new TypesWriter();
085:
086:                tw.writeString("ssh-rsa");
087:
088:                /* S is NOT an MPINT. "The value for 'rsa_signature_blob' is encoded as a string
089:                 * containing s (which is an integer, without lengths or padding, unsigned and in
090:                 * network byte order)."
091:                 */
092:
093:                byte[] s = sig.getS().toByteArray();
094:
095:                /* Remove first zero sign byte, if present */
096:
097:                if ((s.length > 1) && (s[0] == 0x00))
098:                    tw.writeString(s, 1, s.length - 1);
099:                else
100:                    tw.writeString(s, 0, s.length);
101:
102:                return tw.getBytes();
103:            }
104:
105:            public static RSASignature generateSignature(byte[] message,
106:                    RSAPrivateKey pk) throws IOException {
107:                SHA1 md = new SHA1();
108:                md.update(message);
109:                byte[] sha_message = new byte[md.getDigestLength()];
110:                md.digest(sha_message);
111:
112:                byte[] der_header = new byte[] { 0x30, 0x21, 0x30, 0x09, 0x06,
113:                        0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04,
114:                        0x14 };
115:
116:                int rsa_block_len = (pk.getN().bitLength() + 7) / 8;
117:
118:                int num_pad = rsa_block_len
119:                        - (2 + der_header.length + sha_message.length) - 1;
120:
121:                if (num_pad < 8)
122:                    throw new IOException(
123:                            "Cannot sign with RSA, message too long");
124:
125:                byte[] sig = new byte[der_header.length + sha_message.length
126:                        + 2 + num_pad];
127:
128:                sig[0] = 0x01;
129:
130:                for (int i = 0; i < num_pad; i++) {
131:                    sig[i + 1] = (byte) 0xff;
132:                }
133:
134:                sig[num_pad + 1] = 0x00;
135:
136:                System.arraycopy(der_header, 0, sig, 2 + num_pad,
137:                        der_header.length);
138:                System.arraycopy(sha_message, 0, sig, 2 + num_pad
139:                        + der_header.length, sha_message.length);
140:
141:                BigInteger m = new BigInteger(1, sig);
142:
143:                BigInteger s = m.modPow(pk.getD(), pk.getN());
144:
145:                return new RSASignature(s);
146:            }
147:
148:            public static boolean verifySignature(byte[] message,
149:                    RSASignature ds, RSAPublicKey dpk) throws IOException {
150:                SHA1 md = new SHA1();
151:                md.update(message);
152:                byte[] sha_message = new byte[md.getDigestLength()];
153:                md.digest(sha_message);
154:
155:                BigInteger n = dpk.getN();
156:                BigInteger e = dpk.getE();
157:                BigInteger s = ds.getS();
158:
159:                if (n.compareTo(s) <= 0) {
160:                    log.log(20, "ssh-rsa signature: n.compareTo(s) <= 0");
161:                    return false;
162:                }
163:
164:                int rsa_block_len = (n.bitLength() + 7) / 8;
165:
166:                /* And now the show begins */
167:
168:                if (rsa_block_len < 1) {
169:                    log.log(20, "ssh-rsa signature: rsa_block_len < 1");
170:                    return false;
171:                }
172:
173:                byte[] v = s.modPow(e, n).toByteArray();
174:
175:                int startpos = 0;
176:
177:                if ((v.length > 0) && (v[0] == 0x00))
178:                    startpos++;
179:
180:                if ((v.length - startpos) != (rsa_block_len - 1)) {
181:                    log
182:                            .log(20,
183:                                    "ssh-rsa signature: (v.length - startpos) != (rsa_block_len - 1)");
184:                    return false;
185:                }
186:
187:                if (v[startpos] != 0x01) {
188:                    log.log(20, "ssh-rsa signature: v[startpos] != 0x01");
189:                    return false;
190:                }
191:
192:                int pos = startpos + 1;
193:
194:                while (true) {
195:                    if (pos >= v.length) {
196:                        log.log(20, "ssh-rsa signature: pos >= v.length");
197:                        return false;
198:                    }
199:                    if (v[pos] == 0x00)
200:                        break;
201:                    if (v[pos] != (byte) 0xff) {
202:                        log.log(20, "ssh-rsa signature: v[pos] != (byte) 0xff");
203:                        return false;
204:                    }
205:                    pos++;
206:                }
207:
208:                int num_pad = pos - (startpos + 1);
209:
210:                if (num_pad < 8) {
211:                    log.log(20, "ssh-rsa signature: num_pad < 8");
212:                    return false;
213:                }
214:
215:                pos++;
216:
217:                if (pos >= v.length) {
218:                    log.log(20, "ssh-rsa signature: pos >= v.length");
219:                    return false;
220:                }
221:
222:                SimpleDERReader dr = new SimpleDERReader(v, pos, v.length - pos);
223:
224:                byte[] seq = dr.readSequenceAsByteArray();
225:
226:                if (dr.available() != 0) {
227:                    log.log(20, "ssh-rsa signature: dr.available() != 0");
228:                    return false;
229:                }
230:
231:                dr.resetInput(seq);
232:
233:                /* Read digestAlgorithm */
234:
235:                byte digestAlgorithm[] = dr.readSequenceAsByteArray();
236:
237:                /* Inspired by RFC 3347, however, ignoring the comment regarding old BER based implementations */
238:
239:                if ((digestAlgorithm.length < 8)
240:                        || (digestAlgorithm.length > 9)) {
241:                    log
242:                            .log(
243:                                    20,
244:                                    "ssh-rsa signature: (digestAlgorithm.length < 8) || (digestAlgorithm.length > 9)");
245:                    return false;
246:                }
247:
248:                byte[] digestAlgorithm_sha1 = new byte[] { 0x06, 0x05, 0x2b,
249:                        0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00 };
250:
251:                for (int i = 0; i < digestAlgorithm.length; i++) {
252:                    if (digestAlgorithm[i] != digestAlgorithm_sha1[i]) {
253:                        log
254:                                .log(20,
255:                                        "ssh-rsa signature: digestAlgorithm[i] != digestAlgorithm_sha1[i]");
256:                        return false;
257:                    }
258:                }
259:
260:                byte[] digest = dr.readOctetString();
261:
262:                if (dr.available() != 0) {
263:                    log.log(20, "ssh-rsa signature: dr.available() != 0 (II)");
264:                    return false;
265:                }
266:
267:                if (digest.length != sha_message.length) {
268:                    log
269:                            .log(20,
270:                                    "ssh-rsa signature: digest.length != sha_message.length");
271:                    return false;
272:                }
273:
274:                for (int i = 0; i < sha_message.length; i++) {
275:                    if (sha_message[i] != digest[i]) {
276:                        log
277:                                .log(20,
278:                                        "ssh-rsa signature: sha_message[i] != digest[i]");
279:                        return false;
280:                    }
281:                }
282:
283:                return true;
284:            }
285:        }
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