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author | weidai <weidai11@users.noreply.github.com> | 2002-10-04 17:31:41 +0000 |
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committer | weidai <weidai11@users.noreply.github.com> | 2002-10-04 17:31:41 +0000 |
commit | a3b6ece7ab341b5b14135baeccea7d5e4c086771 (patch) | |
tree | 8b045309c238226c32a563b1df6b9c30a2f0e0b3 /md2.cpp | |
download | cryptopp-git-a3b6ece7ab341b5b14135baeccea7d5e4c086771.tar.gz |
Initial revision
Diffstat (limited to 'md2.cpp')
-rw-r--r-- | md2.cpp | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/md2.cpp b/md2.cpp new file mode 100644 index 00000000..aa1a28cb --- /dev/null +++ b/md2.cpp @@ -0,0 +1,108 @@ +// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c +// The original code and all modifications are in the public domain. + +// This is the original introductory comment: + +/* + * md2.c : MD2 hash algorithm. + * + * Part of the Python Cryptography Toolkit, version 1.1 + * + * Distribute and use freely; there are no restrictions on further + * dissemination and usage except those imposed by the laws of your + * country of residence. + * + */ + +#include "pch.h" +#include "md2.h" + +NAMESPACE_BEGIN(CryptoPP) + +MD2::MD2() + : m_X(48), m_C(16), m_buf(16) +{ + Init(); +} + +void MD2::Init() +{ + memset(m_X, 0, 48); + memset(m_C, 0, 16); + memset(m_buf, 0, 16); + m_count = 0; +} + +void MD2::Update(const byte *buf, unsigned int len) +{ + static const byte S[256] = { + 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, + 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, + 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, + 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, + 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, + 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, + 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, + 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, + 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, + 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, + 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, + 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, + 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, + 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, + 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, + 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, + 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, + 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 + }; + + while (len) + { + word32 L = (16-m_count) < len ? (16-m_count) : len; + memcpy(m_buf+m_count, buf, L); + m_count+=L; + buf+=L; + len-=L; + if (m_count==16) + { + byte t; + int i,j; + + m_count=0; + memcpy(m_X+16, m_buf, 16); + t=m_C[15]; + for(i=0; i<16; i++) + { + m_X[32+i]=m_X[16+i]^m_X[i]; + t=m_C[i]^=S[m_buf[i]^t]; + } + + t=0; + for(i=0; i<18; i++) + { + for(j=0; j<48; j++) + t=m_X[j]^=S[t]; + t=(t+i) & 0xFF; + } + } + } +} + +void MD2::TruncatedFinal(byte *hash, unsigned int size) +{ + ThrowIfInvalidTruncatedSize(size); + + byte padding[16]; + word32 padlen; + unsigned int i; + + padlen= 16-m_count; + for(i=0; i<padlen; i++) padding[i]=(byte)padlen; + Update(padding, padlen); + Update(m_C, 16); + memcpy(hash, m_X, size); + + Init(); +} + +NAMESPACE_END |