diff options
Diffstat (limited to 'lib/src/main/java/com/trilead/ssh2/crypto/Base64.java')
| -rw-r--r-- | lib/src/main/java/com/trilead/ssh2/crypto/Base64.java | 296 |
1 files changed, 148 insertions, 148 deletions
diff --git a/lib/src/main/java/com/trilead/ssh2/crypto/Base64.java b/lib/src/main/java/com/trilead/ssh2/crypto/Base64.java index 18a524f..93770ac 100644 --- a/lib/src/main/java/com/trilead/ssh2/crypto/Base64.java +++ b/lib/src/main/java/com/trilead/ssh2/crypto/Base64.java @@ -1,148 +1,148 @@ -
-package com.trilead.ssh2.crypto;
-
-import java.io.CharArrayWriter;
-import java.io.IOException;
-
-/**
- * Basic Base64 Support.
- *
- * @author Christian Plattner, plattner@trilead.com
- * @version $Id: Base64.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $
- */
-public class Base64
-{
- static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
-
- public static char[] encode(byte[] content)
- {
- CharArrayWriter cw = new CharArrayWriter((4 * content.length) / 3);
-
- int idx = 0;
-
- int x = 0;
-
- for (int i = 0; i < content.length; i++)
- {
- if (idx == 0)
- x = (content[i] & 0xff) << 16;
- else if (idx == 1)
- x = x | ((content[i] & 0xff) << 8);
- else
- x = x | (content[i] & 0xff);
-
- idx++;
-
- if (idx == 3)
- {
- cw.write(alphabet[x >> 18]);
- cw.write(alphabet[(x >> 12) & 0x3f]);
- cw.write(alphabet[(x >> 6) & 0x3f]);
- cw.write(alphabet[x & 0x3f]);
-
- idx = 0;
- }
- }
-
- if (idx == 1)
- {
- cw.write(alphabet[x >> 18]);
- cw.write(alphabet[(x >> 12) & 0x3f]);
- cw.write('=');
- cw.write('=');
- }
-
- if (idx == 2)
- {
- cw.write(alphabet[x >> 18]);
- cw.write(alphabet[(x >> 12) & 0x3f]);
- cw.write(alphabet[(x >> 6) & 0x3f]);
- cw.write('=');
- }
-
- return cw.toCharArray();
- }
-
- public static byte[] decode(char[] message) throws IOException
- {
- byte buff[] = new byte[4];
- byte dest[] = new byte[message.length];
-
- int bpos = 0;
- int destpos = 0;
-
- for (int i = 0; i < message.length; i++)
- {
- int c = message[i];
-
- if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t'))
- continue;
-
- if ((c >= 'A') && (c <= 'Z'))
- {
- buff[bpos++] = (byte) (c - 'A');
- }
- else if ((c >= 'a') && (c <= 'z'))
- {
- buff[bpos++] = (byte) ((c - 'a') + 26);
- }
- else if ((c >= '0') && (c <= '9'))
- {
- buff[bpos++] = (byte) ((c - '0') + 52);
- }
- else if (c == '+')
- {
- buff[bpos++] = 62;
- }
- else if (c == '/')
- {
- buff[bpos++] = 63;
- }
- else if (c == '=')
- {
- buff[bpos++] = 64;
- }
- else
- {
- throw new IOException("Illegal char in base64 code.");
- }
-
- if (bpos == 4)
- {
- bpos = 0;
-
- if (buff[0] == 64)
- break;
-
- if (buff[1] == 64)
- throw new IOException("Unexpected '=' in base64 code.");
-
- if (buff[2] == 64)
- {
- int v = (((buff[0] & 0x3f) << 6) | ((buff[1] & 0x3f)));
- dest[destpos++] = (byte) (v >> 4);
- break;
- }
- else if (buff[3] == 64)
- {
- int v = (((buff[0] & 0x3f) << 12) | ((buff[1] & 0x3f) << 6) | ((buff[2] & 0x3f)));
- dest[destpos++] = (byte) (v >> 10);
- dest[destpos++] = (byte) (v >> 2);
- break;
- }
- else
- {
- int v = (((buff[0] & 0x3f) << 18) | ((buff[1] & 0x3f) << 12) | ((buff[2] & 0x3f) << 6) | ((buff[3] & 0x3f)));
- dest[destpos++] = (byte) (v >> 16);
- dest[destpos++] = (byte) (v >> 8);
- dest[destpos++] = (byte) (v);
- }
- }
- }
-
- byte[] res = new byte[destpos];
- System.arraycopy(dest, 0, res, 0, destpos);
-
- return res;
- }
-}
+ +package com.trilead.ssh2.crypto; + +import java.io.CharArrayWriter; +import java.io.IOException; + +/** + * Basic Base64 Support. + * + * @author Christian Plattner, plattner@trilead.com + * @version $Id: Base64.java,v 1.1 2007/10/15 12:49:56 cplattne Exp $ + */ +public class Base64 +{ + static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray(); + + public static char[] encode(byte[] content) + { + CharArrayWriter cw = new CharArrayWriter((4 * content.length) / 3); + + int idx = 0; + + int x = 0; + + for (int i = 0; i < content.length; i++) + { + if (idx == 0) + x = (content[i] & 0xff) << 16; + else if (idx == 1) + x = x | ((content[i] & 0xff) << 8); + else + x = x | (content[i] & 0xff); + + idx++; + + if (idx == 3) + { + cw.write(alphabet[x >> 18]); + cw.write(alphabet[(x >> 12) & 0x3f]); + cw.write(alphabet[(x >> 6) & 0x3f]); + cw.write(alphabet[x & 0x3f]); + + idx = 0; + } + } + + if (idx == 1) + { + cw.write(alphabet[x >> 18]); + cw.write(alphabet[(x >> 12) & 0x3f]); + cw.write('='); + cw.write('='); + } + + if (idx == 2) + { + cw.write(alphabet[x >> 18]); + cw.write(alphabet[(x >> 12) & 0x3f]); + cw.write(alphabet[(x >> 6) & 0x3f]); + cw.write('='); + } + + return cw.toCharArray(); + } + + public static byte[] decode(char[] message) throws IOException + { + byte buff[] = new byte[4]; + byte dest[] = new byte[message.length]; + + int bpos = 0; + int destpos = 0; + + for (int i = 0; i < message.length; i++) + { + int c = message[i]; + + if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t')) + continue; + + if ((c >= 'A') && (c <= 'Z')) + { + buff[bpos++] = (byte) (c - 'A'); + } + else if ((c >= 'a') && (c <= 'z')) + { + buff[bpos++] = (byte) ((c - 'a') + 26); + } + else if ((c >= '0') && (c <= '9')) + { + buff[bpos++] = (byte) ((c - '0') + 52); + } + else if (c == '+') + { + buff[bpos++] = 62; + } + else if (c == '/') + { + buff[bpos++] = 63; + } + else if (c == '=') + { + buff[bpos++] = 64; + } + else + { + throw new IOException("Illegal char in base64 code."); + } + + if (bpos == 4) + { + bpos = 0; + + if (buff[0] == 64) + break; + + if (buff[1] == 64) + throw new IOException("Unexpected '=' in base64 code."); + + if (buff[2] == 64) + { + int v = (((buff[0] & 0x3f) << 6) | ((buff[1] & 0x3f))); + dest[destpos++] = (byte) (v >> 4); + break; + } + else if (buff[3] == 64) + { + int v = (((buff[0] & 0x3f) << 12) | ((buff[1] & 0x3f) << 6) | ((buff[2] & 0x3f))); + dest[destpos++] = (byte) (v >> 10); + dest[destpos++] = (byte) (v >> 2); + break; + } + else + { + int v = (((buff[0] & 0x3f) << 18) | ((buff[1] & 0x3f) << 12) | ((buff[2] & 0x3f) << 6) | ((buff[3] & 0x3f))); + dest[destpos++] = (byte) (v >> 16); + dest[destpos++] = (byte) (v >> 8); + dest[destpos++] = (byte) (v); + } + } + } + + byte[] res = new byte[destpos]; + System.arraycopy(dest, 0, res, 0, destpos); + + return res; + } +} |