X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fbouncycastle%2Futil%2Fencoders%2FBase64.java;h=ec9f6a4eccd3139f9bb6fbd05e7536e31e3d622c;hb=b32cea3f3e272ab00899d134d75a8bd7bcf6c8c0;hp=423fb304a31f8bc6f066f086477dc3126446d8ae;hpb=e5e9355b4f4e0e2c8de9068a71c1e3cc26fa9905;p=org.ibex.core.git diff --git a/src/org/bouncycastle/util/encoders/Base64.java b/src/org/bouncycastle/util/encoders/Base64.java index 423fb30..ec9f6a4 100644 --- a/src/org/bouncycastle/util/encoders/Base64.java +++ b/src/org/bouncycastle/util/encoders/Base64.java @@ -2,259 +2,253 @@ package org.bouncycastle.util.encoders; public class Base64 { - private static byte[] encodingTable = - { - (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G', + private static final byte[] encodingTable = + { + (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G', (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N', (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z', - (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g', + (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g', (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n', (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', (byte)'v', - (byte)'w', (byte)'x', (byte)'y', (byte)'z', - (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', + (byte)'w', (byte)'x', (byte)'y', (byte)'z', + (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', - (byte)'+', (byte)'/' - }; - - /** - * encode the input data producong a base 64 encoded byte array. - * - * @return a byte array containing the base 64 encoded data. - */ - public static byte[] encode( - byte[] data) - { - byte[] bytes; - - if ((data.length % 3) == 0) - { - bytes = new byte[4 * data.length / 3]; - } - else - { - bytes = new byte[4 * ((data.length / 3) + 1)]; - } - - for (int i = 0, j = 0; - i < ((data.length / 3) * 3); i += 3, j += 4) - { - int b1, b2, b3, b4; - int d1, d2, d3; - - d1 = data[i] & 0xff; - d2 = data[i + 1] & 0xff; - d3 = data[i + 2] & 0xff; - - b1 = (d1 >>> 2) & 0x3f; - b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f; - b3 = ((d2 << 2) | (d3 >>> 6)) & 0x3f; - b4 = d3 & 0x3f; - - bytes[j] = encodingTable[b1]; - bytes[j + 1] = encodingTable[b2]; - bytes[j + 2] = encodingTable[b3]; - bytes[j + 3] = encodingTable[b4]; - } - - /* - * process the tail end. - */ - int b1, b2, b3; - int d1, d2; - - switch (data.length % 3) - { - case 0: /* nothing left to do */ - break; - case 1: - d1 = data[data.length - 1] & 0xff; - b1 = (d1 >>> 2) & 0x3f; - b2 = (d1 << 4) & 0x3f; - - bytes[bytes.length - 4] = encodingTable[b1]; - bytes[bytes.length - 3] = encodingTable[b2]; - bytes[bytes.length - 2] = (byte)'='; - bytes[bytes.length - 1] = (byte)'='; - break; - case 2: - d1 = data[data.length - 2] & 0xff; - d2 = data[data.length - 1] & 0xff; - - b1 = (d1 >>> 2) & 0x3f; - b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f; - b3 = (d2 << 2) & 0x3f; - - bytes[bytes.length - 4] = encodingTable[b1]; - bytes[bytes.length - 3] = encodingTable[b2]; - bytes[bytes.length - 2] = encodingTable[b3]; - bytes[bytes.length - 1] = (byte)'='; - break; - } - - return bytes; - } - - /* - * set up the decoding table. - */ - private static byte[] decodingTable; - - static - { - decodingTable = new byte[128]; - - for (int i = 'A'; i <= 'Z'; i++) - { - decodingTable[i] = (byte)(i - 'A'); - } - - for (int i = 'a'; i <= 'z'; i++) - { - decodingTable[i] = (byte)(i - 'a' + 26); - } - - for (int i = '0'; i <= '9'; i++) - { - decodingTable[i] = (byte)(i - '0' + 52); - } - - decodingTable['+'] = 62; - decodingTable['/'] = 63; - } - - /** - * decode the base 64 encoded input data. - * - * @return a byte array representing the decoded data. - */ - public static byte[] decode( - byte[] data) - { - byte[] bytes; - byte b1, b2, b3, b4; - - if (data[data.length - 2] == '=') - { - bytes = new byte[(((data.length / 4) - 1) * 3) + 1]; - } - else if (data[data.length - 1] == '=') - { - bytes = new byte[(((data.length / 4) - 1) * 3) + 2]; - } - else - { - bytes = new byte[((data.length / 4) * 3)]; - } - - for (int i = 0, j = 0; i < data.length - 4; i += 4, j += 3) - { - b1 = decodingTable[data[i]]; - b2 = decodingTable[data[i + 1]]; - b3 = decodingTable[data[i + 2]]; - b4 = decodingTable[data[i + 3]]; - - bytes[j] = (byte)((b1 << 2) | (b2 >> 4)); - bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2)); - bytes[j + 2] = (byte)((b3 << 6) | b4); - } - - if (data[data.length - 2] == '=') - { - b1 = decodingTable[data[data.length - 4]]; - b2 = decodingTable[data[data.length - 3]]; - - bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4)); - } - else if (data[data.length - 1] == '=') - { - b1 = decodingTable[data[data.length - 4]]; - b2 = decodingTable[data[data.length - 3]]; - b3 = decodingTable[data[data.length - 2]]; - - bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4)); - bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2)); - } - else - { - b1 = decodingTable[data[data.length - 4]]; - b2 = decodingTable[data[data.length - 3]]; - b3 = decodingTable[data[data.length - 2]]; - b4 = decodingTable[data[data.length - 1]]; - - bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4)); - bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2)); - bytes[bytes.length - 1] = (byte)((b3 << 6) | b4); - } - - return bytes; - } - - /** - * decode the base 64 encoded String data. - * - * @return a byte array representing the decoded data. - */ - public static byte[] decode( - String data) - { - byte[] bytes; - byte b1, b2, b3, b4; - - if (data.charAt(data.length() - 2) == '=') - { - bytes = new byte[(((data.length() / 4) - 1) * 3) + 1]; - } - else if (data.charAt(data.length() - 1) == '=') - { - bytes = new byte[(((data.length() / 4) - 1) * 3) + 2]; - } - else - { - bytes = new byte[((data.length() / 4) * 3)]; - } - - for (int i = 0, j = 0; i < data.length() - 4; i += 4, j += 3) - { - b1 = decodingTable[data.charAt(i)]; - b2 = decodingTable[data.charAt(i + 1)]; - b3 = decodingTable[data.charAt(i + 2)]; - b4 = decodingTable[data.charAt(i + 3)]; - - bytes[j] = (byte)((b1 << 2) | (b2 >> 4)); - bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2)); - bytes[j + 2] = (byte)((b3 << 6) | b4); - } - - if (data.charAt(data.length() - 2) == '=') - { - b1 = decodingTable[data.charAt(data.length() - 4)]; - b2 = decodingTable[data.charAt(data.length() - 3)]; - - bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4)); - } - else if (data.charAt(data.length() - 1) == '=') - { - b1 = decodingTable[data.charAt(data.length() - 4)]; - b2 = decodingTable[data.charAt(data.length() - 3)]; - b3 = decodingTable[data.charAt(data.length() - 2)]; - - bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4)); - bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2)); - } - else - { - b1 = decodingTable[data.charAt(data.length() - 4)]; - b2 = decodingTable[data.charAt(data.length() - 3)]; - b3 = decodingTable[data.charAt(data.length() - 2)]; - b4 = decodingTable[data.charAt(data.length() - 1)]; - - bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4)); - bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2)); - bytes[bytes.length - 1] = (byte)((b3 << 6) | b4); - } - - return bytes; - } + (byte)'+', (byte)'/' + }; + + /** + * encode the input data producong a base 64 encoded byte array. + * + * @return a byte array containing the base 64 encoded data. + */ + public static byte[] encode( + byte[] data) + { + byte[] bytes; + + int modulus = data.length % 3; + if (modulus == 0) + { + bytes = new byte[4 * data.length / 3]; + } + else + { + bytes = new byte[4 * ((data.length / 3) + 1)]; + } + + int dataLength = (data.length - modulus); + int a1, a2, a3; + for (int i = 0, j = 0; i < dataLength; i += 3, j += 4) + { + a1 = data[i] & 0xff; + a2 = data[i + 1] & 0xff; + a3 = data[i + 2] & 0xff; + + bytes[j] = encodingTable[(a1 >>> 2) & 0x3f]; + bytes[j + 1] = encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f]; + bytes[j + 2] = encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f]; + bytes[j + 3] = encodingTable[a3 & 0x3f]; + } + + /* + * process the tail end. + */ + int b1, b2, b3; + int d1, d2; + + switch (modulus) + { + case 0: /* nothing left to do */ + break; + case 1: + d1 = data[data.length - 1] & 0xff; + b1 = (d1 >>> 2) & 0x3f; + b2 = (d1 << 4) & 0x3f; + + bytes[bytes.length - 4] = encodingTable[b1]; + bytes[bytes.length - 3] = encodingTable[b2]; + bytes[bytes.length - 2] = (byte)'='; + bytes[bytes.length - 1] = (byte)'='; + break; + case 2: + d1 = data[data.length - 2] & 0xff; + d2 = data[data.length - 1] & 0xff; + + b1 = (d1 >>> 2) & 0x3f; + b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f; + b3 = (d2 << 2) & 0x3f; + + bytes[bytes.length - 4] = encodingTable[b1]; + bytes[bytes.length - 3] = encodingTable[b2]; + bytes[bytes.length - 2] = encodingTable[b3]; + bytes[bytes.length - 1] = (byte)'='; + break; + } + + return bytes; + } + + /* + * set up the decoding table. + */ + private static final byte[] decodingTable; + + static + { + decodingTable = new byte[128]; + + for (int i = 'A'; i <= 'Z'; i++) + { + decodingTable[i] = (byte)(i - 'A'); + } + + for (int i = 'a'; i <= 'z'; i++) + { + decodingTable[i] = (byte)(i - 'a' + 26); + } + + for (int i = '0'; i <= '9'; i++) + { + decodingTable[i] = (byte)(i - '0' + 52); + } + + decodingTable['+'] = 62; + decodingTable['/'] = 63; + } + + /** + * decode the base 64 encoded input data. + * + * @return a byte array representing the decoded data. + */ + public static byte[] decode( + byte[] data) + { + byte[] bytes; + byte b1, b2, b3, b4; + + if (data[data.length - 2] == '=') + { + bytes = new byte[(((data.length / 4) - 1) * 3) + 1]; + } + else if (data[data.length - 1] == '=') + { + bytes = new byte[(((data.length / 4) - 1) * 3) + 2]; + } + else + { + bytes = new byte[((data.length / 4) * 3)]; + } + + for (int i = 0, j = 0; i < data.length - 4; i += 4, j += 3) + { + b1 = decodingTable[data[i]]; + b2 = decodingTable[data[i + 1]]; + b3 = decodingTable[data[i + 2]]; + b4 = decodingTable[data[i + 3]]; + + bytes[j] = (byte)((b1 << 2) | (b2 >> 4)); + bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2)); + bytes[j + 2] = (byte)((b3 << 6) | b4); + } + + if (data[data.length - 2] == '=') + { + b1 = decodingTable[data[data.length - 4]]; + b2 = decodingTable[data[data.length - 3]]; + + bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4)); + } + else if (data[data.length - 1] == '=') + { + b1 = decodingTable[data[data.length - 4]]; + b2 = decodingTable[data[data.length - 3]]; + b3 = decodingTable[data[data.length - 2]]; + + bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4)); + bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2)); + } + else + { + b1 = decodingTable[data[data.length - 4]]; + b2 = decodingTable[data[data.length - 3]]; + b3 = decodingTable[data[data.length - 2]]; + b4 = decodingTable[data[data.length - 1]]; + + bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4)); + bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2)); + bytes[bytes.length - 1] = (byte)((b3 << 6) | b4); + } + + return bytes; + } + + /** + * decode the base 64 encoded String data. + * + * @return a byte array representing the decoded data. + */ + public static byte[] decode( + String data) + { + byte[] bytes; + byte b1, b2, b3, b4; + + if (data.charAt(data.length() - 2) == '=') + { + bytes = new byte[(((data.length() / 4) - 1) * 3) + 1]; + } + else if (data.charAt(data.length() - 1) == '=') + { + bytes = new byte[(((data.length() / 4) - 1) * 3) + 2]; + } + else + { + bytes = new byte[((data.length() / 4) * 3)]; + } + + for (int i = 0, j = 0; i < data.length() - 4; i += 4, j += 3) + { + b1 = decodingTable[data.charAt(i)]; + b2 = decodingTable[data.charAt(i + 1)]; + b3 = decodingTable[data.charAt(i + 2)]; + b4 = decodingTable[data.charAt(i + 3)]; + + bytes[j] = (byte)((b1 << 2) | (b2 >> 4)); + bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2)); + bytes[j + 2] = (byte)((b3 << 6) | b4); + } + + if (data.charAt(data.length() - 2) == '=') + { + b1 = decodingTable[data.charAt(data.length() - 4)]; + b2 = decodingTable[data.charAt(data.length() - 3)]; + + bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4)); + } + else if (data.charAt(data.length() - 1) == '=') + { + b1 = decodingTable[data.charAt(data.length() - 4)]; + b2 = decodingTable[data.charAt(data.length() - 3)]; + b3 = decodingTable[data.charAt(data.length() - 2)]; + + bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4)); + bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2)); + } + else + { + b1 = decodingTable[data.charAt(data.length() - 4)]; + b2 = decodingTable[data.charAt(data.length() - 3)]; + b3 = decodingTable[data.charAt(data.length() - 2)]; + b4 = decodingTable[data.charAt(data.length() - 1)]; + + bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4)); + bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2)); + bytes[bytes.length - 1] = (byte)((b3 << 6) | b4); + } + + return bytes; + } }