diff options
author | Paul Davis <paul@linuxaudiosystems.com> | 2014-07-08 00:49:33 -0400 |
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committer | Paul Davis <paul@linuxaudiosystems.com> | 2014-07-08 00:53:13 -0400 |
commit | 6b9ef295977ae7d616be3ffaf9defa9d595b8b3e (patch) | |
tree | ccea076e357702eb54b3bd00552048635c182abb /libs/pbd/md5.cc | |
parent | e21907d247ebbbdcf6d88c6357a316f5d8786f3f (diff) |
add cleaned up MD5 C++ implementation for general use
Diffstat (limited to 'libs/pbd/md5.cc')
-rw-r--r-- | libs/pbd/md5.cc | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/libs/pbd/md5.cc b/libs/pbd/md5.cc new file mode 100644 index 0000000000..0532d29879 --- /dev/null +++ b/libs/pbd/md5.cc @@ -0,0 +1,341 @@ +/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All + * rights reserved. + * + * License to copy and use this software is granted provided that it + * is identified as the "RSA Data Security, Inc. MD5 Message-Digest + * Algorithm" in all material mentioning or referencing this software + * or this function. + * + * License is also granted to make and use derivative works provided + * that such works are identified as "derived from the RSA Data + * Security, Inc. MD5 Message-Digest Algorithm" in all material + * mentioning or referencing the derived work. + * + * RSA Data Security, Inc. makes no representations concerning either + * the merchantability of this software or the suitability of this + * software for any particular purpose. It is provided "as is" + * without express or implied warranty of any kind. + * + * These notices must be retained in any copies of any part of this + * documentation and/or software. + */ + +#include <stdio.h> + +#include "pbd/md5.h" + +// Constants for MD5Transform routine. +static const int S11 = 7; +static const int S12 = 12; +static const int S13 = 17; +static const int S14 = 22; +static const int S21 = 5; +static const int S22 = 9; +static const int S23 = 14; +static const int S24 = 20; +static const int S31 = 4; +static const int S32 = 11; +static const int S33 = 16; +static const int S34 = 23; +static const int S41 = 6; +static const int S42 = 10; +static const int S43 = 15; +static const int S44 = 21; + +static unsigned char PADDING[64] = { + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +// F, G, H and I are basic MD5 functions. +#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) +#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) +#define H(x, y, z) ((x) ^ (y) ^ (z)) +#define I(x, y, z) ((y) ^ ((x) | (~z))) + +// ROTATE_LEFT rotates x left n bits. +#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) + +// FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. +// Rotation is separate from addition to prevent recomputation. +#define FF(a, b, c, d, x, s, ac) { \ + (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ + } +#define GG(a, b, c, d, x, s, ac) { \ + (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ + } +#define HH(a, b, c, d, x, s, ac) { \ + (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ + } +#define II(a, b, c, d, x, s, ac) { \ + (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ + } + +MD5::MD5 () +{ + Init (); +} + +void +MD5::Init () +{ + context.count[0] = context.count[1] = 0; + // Load magic initialization constants. + context.state[0] = 0x67452301; + context.state[1] = 0xefcdab89; + context.state[2] = 0x98badcfe; + context.state[3] = 0x10325476; +} + +/** MD5 block update operation. Continues an MD5 message-digest + * operation, processing another message block, and updating the + * context. + */ + +void +MD5::Update(uint8_t const *input, size_t inputLen) +{ + unsigned int i, index, partLen; + + // Compute number of bytes mod 64 + index = (unsigned int)((context.count[0] >> 3) & 0x3F); + + // Update number of bits + if ((context.count[0] += ((uint32_t)inputLen << 3)) + < ((uint32_t)inputLen << 3)) + context.count[1]++; + context.count[1] += ((uint32_t)inputLen >> 29); + + partLen = 64 - index; + + // Transform as many times as possible. + if (inputLen >= partLen) { + memcpy((void*)&context.buffer[index], (void const *)input, partLen); + Transform (context.state, context.buffer); + + for (i = partLen; i + 63 < inputLen; i += 64) { + Transform (context.state, (uint8_t const *) &input[i]); + } + + index = 0; + } + else + i = 0; + + /* Buffer remaining input */ + memcpy ((void*)&context.buffer[index], (void const *)&input[i], inputLen-i); +} + +// MD5 finalization. Ends an MD5 message-digest operation, writing the +// the message digest and zeroizing the context. +// Writes to digestRaw + +void +MD5::Final() +{ + uint8_t bits[8]; + size_t index, padLen; + + // Save number of bits + Encode (bits, context.count, 8); + + // Pad out to 56 mod 64. + index = (size_t)((context.count[0] >> 3) & 0x3f); + padLen = (index < 56) ? (56 - index) : (120 - index); + Update (PADDING, padLen); + + // Append length (before padding) + Update (bits, 8); + + // Store state in digest + Encode (digestRaw, context.state, 16); + + // Zeroize sensitive information. + memset((void*)&context, 0, sizeof (context)); + + writeToString(); +} + +/// Buffer must be 32+1 (nul) = 33 chars long at least +void +MD5::writeToString() +{ + int pos; + + for (pos = 0; pos < 16; pos++) { + sprintf (digestChars+(pos*2), "%02x", digestRaw[pos]); + } +} + +/// Load a file from disk and digest it +// Digests a file and returns the result. +char* +MD5::digestFile (char *filename) +{ + Init(); + + FILE *file; + int len; + unsigned char buffer[1024]; + + if ((file = fopen (filename, "rb")) == NULL) { + printf ("%s can't be opened\n", filename); + } else { + while ((len = fread (buffer, 1, 1024, file))) { + Update (buffer, len); + } + Final(); + fclose (file); + } + + return digestChars; +} + +/// Digests a byte-array already in memory +char* +MD5::digestMemory (uint8_t const * memchunk, size_t len) +{ + Init (); + Update (memchunk, len); + Final (); + + return digestChars; +} + +// Digests a string and prints the result. +char* +MD5::digestString (char const * string) +{ + Init (); + Update ((uint8_t const *) string, strlen (string)); + Final(); + + return digestChars; +} + +void +MD5::Transform (uint32_t state[4], uint8_t const * block) +{ + uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; + + Decode (x, block, 64); + + /* Round 1 */ + FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ + FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ + FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ + FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ + FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ + FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ + FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ + FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ + FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ + FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ + FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ + FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ + FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ + FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ + FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ + FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ + + /* Round 2 */ + GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ + GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ + GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ + GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ + GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ + GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ + GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ + GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ + GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ + GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ + GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ + GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ + GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ + GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ + GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ + GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ + + /* Round 3 */ + HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ + HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ + HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ + HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ + HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ + HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ + HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ + HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ + HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ + HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ + HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ + HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ + HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ + HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ + HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ + HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ + + /* Round 4 */ + II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ + II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ + II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ + II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ + II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ + II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ + II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ + II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ + II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ + II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ + II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ + II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ + II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ + II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ + II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ + II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + + // Zeroize sensitive information. + memset((void*)x, 0, sizeof (x)); +} + +/* Encodes input (uint32_t) into output (unsigned char). Assumes len is + * a multiple of 4. + */ +void +MD5::Encode (uint8_t *output, uint32_t const * input, size_t len) +{ + size_t i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) { + output[j] = (unsigned char)(input[i] & 0xff); + output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); + output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); + output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); + } +} + +/** Decodes input (unsigned char) into output (uint32_t). Assumes len is + * a multiple of 4. + */ + +void +MD5::Decode (uint32_t *output, uint8_t const * input, size_t len) +{ + size_t i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) + output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) | + (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24); +} |