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Diffstat (limited to 'src/security/digest/sha1/sha1MessageDigest.cpp')
| -rw-r--r-- | src/security/digest/sha1/sha1MessageDigest.cpp | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/security/digest/sha1/sha1MessageDigest.cpp b/src/security/digest/sha1/sha1MessageDigest.cpp new file mode 100644 index 00000000..de3f6948 --- /dev/null +++ b/src/security/digest/sha1/sha1MessageDigest.cpp @@ -0,0 +1,262 @@ +// +// VMime library (http://www.vmime.org) +// Copyright (C) 2002-2005 Vincent Richard <[email protected]> +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License as +// published by the Free Software Foundation; either version 2 of +// the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +// +// +// This is an implementation by Steve Reid <[email protected]> +// 100% public domain. + +#include "vmime/security/digest/sha1/sha1MessageDigest.hpp" + + +namespace vmime { +namespace security { +namespace digest { +namespace sha1 { + + +#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) + +// blk0() and blk() perform the initial expand. +// I got the idea of expanding during the round function from SSLeay +#if VMIME_BYTE_ORDER_LITTLE_ENDIAN + #define blk0(i) (block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) \ + | (rol(block->l[i], 8) & 0x00FF00FF)) +#else + #define blk0(i) block->l[i] +#endif + +#define blk(i) (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] \ + ^ block->l[(i + 2) & 15] ^ block->l[i & 15], 1)) + +// (R0+R1), R2, R3, R4 are the different operations used in SHA1 +#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); +#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); +#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); +#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); +#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); + + +sha1MessageDigest::sha1MessageDigest() +{ + init(); +} + + +void sha1MessageDigest::reset() +{ + init(); +} + + +void sha1MessageDigest::init() +{ + m_state[0] = 0x67452301; + m_state[1] = 0xefcdab89; + m_state[2] = 0x98badcfe; + m_state[3] = 0x10325476; + m_state[4] = 0xc3d2e1f0; + + m_count[0] = 0; + m_count[1] = 0; +} + + +void sha1MessageDigest::update(const byte b) +{ + update(&b, 1); +} + + +void sha1MessageDigest::update(const string& s) +{ + update(reinterpret_cast <const byte*>(s.data()), s.length()); +} + + +void sha1MessageDigest::update(const byte* buffer, const unsigned long offset, + const unsigned long len) +{ + update(buffer + offset, len); +} + + +void sha1MessageDigest::update(const byte* buffer, const unsigned long len) +{ + unsigned int i, j; + + j = (m_count[0] >> 3) & 63; + + if ((m_count[0] += len << 3) < (len << 3)) + m_count[1]++; + + m_count[1] += (len >> 29); + + if ((j + len) > 63) + { + memcpy(&m_buffer[j], buffer, (i = 64 - j)); + + transform(m_state, m_buffer); + + for ( ; i + 63 < len ; i += 64) + transform(m_state, &buffer[i]); + + j = 0; + } + else + { + i = 0; + } + + memcpy(&m_buffer[j], &buffer[i], len - i); +} + + +void sha1MessageDigest::finalize() +{ + unsigned long i, j; + unsigned char finalcount[8]; + + for (i = 0 ; i < 8 ; i++) + { + finalcount[i] = static_cast <unsigned char> + ((m_count[(i >= 4 ? 0 : 1)] + >> ((3-(i & 3)) * 8) ) & 255); // Endian independent + } + + update(reinterpret_cast <const byte*>("\200"), 1); + + while ((m_count[0] & 504) != 448) + update(reinterpret_cast <const byte*>("\0"), 1); + + update(finalcount, 8); // Should cause a transform() + + for (i = 0 ; i < 20 ; i++) + { + m_digest[i] = static_cast <unsigned char> + ((m_state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255); + } + + // Wipe variables + i = j = 0; + + memset(m_buffer, 0, 64); + memset(m_state, 0, 20); + memset(m_count, 0, 8); + memset(&finalcount, 0, 8); +} + + +void sha1MessageDigest::finalize(const string& s) +{ + finalize(reinterpret_cast <const byte*>(s.data()), s.length()); +} + + +void sha1MessageDigest::finalize(const byte* buffer, const unsigned long len) +{ + update(buffer, len); + finalize(); +} + + +void sha1MessageDigest::finalize(const byte* buffer, + const unsigned long offset, const unsigned long len) +{ + finalize(buffer + offset, len); +} + + +/** Hash a single 512-bit block. + * This is the core of the algorithm. + */ +void sha1MessageDigest::transform + (unsigned long state[5], const unsigned char buffer[64]) +{ + unsigned long a, b, c, d, e; + + typedef union + { + unsigned char c[64]; + unsigned long l[16]; + } CHAR64LONG16; + + CHAR64LONG16* block; + static unsigned char workspace[64]; + + block = reinterpret_cast <CHAR64LONG16*>(workspace); + memcpy(block, buffer, 64); + + // Copy context->state[] to working vars + a = state[0]; + b = state[1]; + c = state[2]; + d = state[3]; + e = state[4]; + + // 4 rounds of 20 operations each. Loop unrolled. + R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3); + R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7); + R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11); + R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15); + R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19); + R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23); + R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27); + R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31); + R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35); + R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39); + R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43); + R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47); + R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51); + R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55); + R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59); + R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63); + R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67); + R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71); + R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75); + R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79); + + // Add the working vars back into context.state[] + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + state[4] += e; + + // Wipe variables + a = b = c = d = e = 0; +} + + +const int sha1MessageDigest::getDigestLength() const +{ + return 20; +} + + +const byte* sha1MessageDigest::getDigest() const +{ + return m_digest; +} + + +} // sha1 +} // digest +} // security +} // vmime + + |