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MD5_HASH Class Reference

#include <md5_hash.h>

Classes

struct  MD5_CTX
 

Public Member Functions

 MD5_HASH ()
 
 MD5_HASH (const MD5_HASH &aOther)
 
 ~MD5_HASH ()
 
void Init ()
 
void Hash (uint8_t *data, uint32_t length)
 
void Hash (int value)
 
void Finalize ()
 
bool IsValid () const
 
void SetValid (bool aValid)
 
MD5_HASHoperator= (const MD5_HASH &aOther)
 
bool operator== (const MD5_HASH &aOther) const
 
bool operator!= (const MD5_HASH &aOther) const
 
std::string Format (bool aCompactForm=false)
 

Private Member Functions

void md5_transform (MD5_CTX *ctx, uint8_t data[])
 
void md5_init (MD5_CTX *ctx)
 
void md5_update (MD5_CTX *ctx, uint8_t data[], uint32_t len)
 
void md5_final (MD5_CTX *ctx, uint8_t hash[])
 

Private Attributes

bool m_valid
 
MD5_CTX m_ctx
 
uint8_t m_hash [16]
 

Detailed Description

Definition at line 11 of file md5_hash.h.

Constructor & Destructor Documentation

◆ MD5_HASH() [1/2]

MD5_HASH::MD5_HASH ( )

Definition at line 30 of file md5_hash.cpp.

31{
32 Init();
33}
void Init()
Definition: md5_hash.cpp:58

References Init().

◆ MD5_HASH() [2/2]

MD5_HASH::MD5_HASH ( const MD5_HASH aOther)

Definition at line 36 of file md5_hash.cpp.

37{
38 m_valid = aOther.m_valid;
39 m_ctx = aOther.m_ctx;
40 memcpy( m_hash, aOther.m_hash, 16 );
41}
bool m_valid
Definition: md5_hash.h:53
uint8_t m_hash[16]
Definition: md5_hash.h:55
MD5_CTX m_ctx
Definition: md5_hash.h:54

References m_ctx, m_hash, and m_valid.

◆ ~MD5_HASH()

MD5_HASH::~MD5_HASH ( )

Definition at line 44 of file md5_hash.cpp.

45{
46}

Member Function Documentation

◆ Finalize()

void MD5_HASH::Finalize ( )

Definition at line 78 of file md5_hash.cpp.

79{
81 m_valid = true;
82}
void md5_final(MD5_CTX *ctx, uint8_t hash[])
Definition: md5_hash.cpp:245

References m_ctx, m_hash, m_valid, and md5_final().

Referenced by SHAPE_POLY_SET::checksum().

◆ Format()

std::string MD5_HASH::Format ( bool  aCompactForm = false)
Returns
Build a hexadecimal string from the 16 bytes of MD5_HASH Mainly for debug purposes.
Parameters
aCompactForm= false to generate a string with spaces between each byte (2 chars) = true to generate a string filled with 32 hexadecimal chars

Definition at line 97 of file md5_hash.cpp.

98{
99 std::string data;
100
101 // Build a hexadecimal string from the 16 bytes of MD5_HASH:
102 for( int ii = 0; ii < 16; ++ii )
103 {
104 char lsb = ( m_hash[ii] & 0x0F ) + '0';
105
106 if( lsb > '9' )
107 lsb += 'A'-'9';
108
109 char msb = ( ( m_hash[ii] >> 4 ) & 0x0F ) + '0';
110
111 if( msb > '9' )
112 msb += 'A'-'9';
113
114 data += msb;
115 data += lsb;
116
117 if( !aCompactForm )
118 data += ' ';
119 }
120
121 return data;
122}

References m_hash.

Referenced by DSN::SPECCTRA_DB::makePADSTACK().

◆ Hash() [1/2]

void MD5_HASH::Hash ( int  value)

Definition at line 72 of file md5_hash.cpp.

73{
74 md5_update( &m_ctx, (uint8_t*) &value, sizeof(int) );
75}
void md5_update(MD5_CTX *ctx, uint8_t data[], uint32_t len)
Definition: md5_hash.cpp:228

References m_ctx, and md5_update().

◆ Hash() [2/2]

void MD5_HASH::Hash ( uint8_t *  data,
uint32_t  length 
)

Definition at line 66 of file md5_hash.cpp.

67{
68 md5_update( &m_ctx, data, length );
69}

References m_ctx, and md5_update().

Referenced by SHAPE_POLY_SET::checksum().

◆ Init()

void MD5_HASH::Init ( )

Definition at line 58 of file md5_hash.cpp.

59{
60 m_valid = false;
61 md5_init( &m_ctx );
62 memset( m_hash, 0, 16 );
63}
void md5_init(MD5_CTX *ctx)
Definition: md5_hash.cpp:215

References m_ctx, m_hash, m_valid, and md5_init().

Referenced by MD5_HASH().

◆ IsValid()

bool MD5_HASH::IsValid ( ) const
inline

◆ md5_final()

void MD5_HASH::md5_final ( MD5_CTX ctx,
uint8_t  hash[] 
)
private

Definition at line 245 of file md5_hash.cpp.

246{
247 uint32_t i = ctx->datalen;
248
249 // Pad whatever data is left in the buffer.
250 if( ctx->datalen < 56 )
251 {
252 ctx->data[i++] = 0x80;
253
254 while( i < 56 )
255 ctx->data[i++] = 0x00;
256 }
257 else if (ctx->datalen >= 56)
258 {
259 ctx->data[i++] = 0x80;
260
261 while( i < 64 )
262 ctx->data[i++] = 0x00;
263
264 md5_transform( ctx, ctx->data );
265 memset( ctx->data, 0, 56 );
266 }
267
268 // Append to the padding the total message's length in bits and transform.
269 DBL_INT_ADD(ctx->bitlen[0],ctx->bitlen[1],8 * ctx->datalen);
270 ctx->data[56] = ctx->bitlen[0];
271 ctx->data[57] = ctx->bitlen[0] >> 8;
272 ctx->data[58] = ctx->bitlen[0] >> 16;
273 ctx->data[59] = ctx->bitlen[0] >> 24;
274 ctx->data[60] = ctx->bitlen[1];
275 ctx->data[61] = ctx->bitlen[1] >> 8;
276 ctx->data[62] = ctx->bitlen[1] >> 16;
277 ctx->data[63] = ctx->bitlen[1] >> 24;
278 md5_transform(ctx,ctx->data);
279
280 // Since this implementation uses little endian byte ordering and MD uses big endian,
281 // reverse all the bytes when copying the final state to the output hash.
282 for( i=0; i < 4; ++i )
283 {
284 hash[i] = (ctx->state[0] >> (i*8)) & 0x000000ff;
285 hash[i+4] = (ctx->state[1] >> (i*8)) & 0x000000ff;
286 hash[i+8] = (ctx->state[2] >> (i*8)) & 0x000000ff;
287 hash[i+12] = (ctx->state[3] >> (i*8)) & 0x000000ff;
288 }
289}
void md5_transform(MD5_CTX *ctx, uint8_t data[])
Definition: md5_hash.cpp:125
#define DBL_INT_ADD(a, b, c)
Definition: md5_hash.cpp:12

References MD5_HASH::MD5_CTX::bitlen, MD5_HASH::MD5_CTX::data, MD5_HASH::MD5_CTX::datalen, DBL_INT_ADD, md5_transform(), and MD5_HASH::MD5_CTX::state.

Referenced by Finalize().

◆ md5_init()

void MD5_HASH::md5_init ( MD5_CTX ctx)
private

Definition at line 215 of file md5_hash.cpp.

216{
217 memset( ctx->data, 0, 64 );
218 ctx->datalen = 0;
219 ctx->bitlen[0] = 0;
220 ctx->bitlen[1] = 0;
221 ctx->state[0] = 0x67452301;
222 ctx->state[1] = 0xEFCDAB89;
223 ctx->state[2] = 0x98BADCFE;
224 ctx->state[3] = 0x10325476;
225}

References MD5_HASH::MD5_CTX::bitlen, MD5_HASH::MD5_CTX::data, MD5_HASH::MD5_CTX::datalen, and MD5_HASH::MD5_CTX::state.

Referenced by Init().

◆ md5_transform()

void MD5_HASH::md5_transform ( MD5_CTX ctx,
uint8_t  data[] 
)
private

Definition at line 125 of file md5_hash.cpp.

126{
127 uint32_t a,b,c,d,m[16],i,j;
128
129 // MD5 specifies big endian byte order, but this implementation assumes a little
130 // endian byte order CPU. Reverse all the bytes upon input, and re-reverse them
131 // on output (in md5_final()).
132 for( i=0, j=0; i < 16; ++i, j += 4 )
133 m[i] = (data[j]) + (data[j+1] << 8) + (data[j+2] << 16) + (data[j+3] << 24);
134
135 a = ctx->state[0];
136 b = ctx->state[1];
137 c = ctx->state[2];
138 d = ctx->state[3];
139
140 FF(a,b,c,d,m[0], 7,0xd76aa478);
141 FF(d,a,b,c,m[1], 12,0xe8c7b756);
142 FF(c,d,a,b,m[2], 17,0x242070db);
143 FF(b,c,d,a,m[3], 22,0xc1bdceee);
144 FF(a,b,c,d,m[4], 7,0xf57c0faf);
145 FF(d,a,b,c,m[5], 12,0x4787c62a);
146 FF(c,d,a,b,m[6], 17,0xa8304613);
147 FF(b,c,d,a,m[7], 22,0xfd469501);
148 FF(a,b,c,d,m[8], 7,0x698098d8);
149 FF(d,a,b,c,m[9], 12,0x8b44f7af);
150 FF(c,d,a,b,m[10],17,0xffff5bb1);
151 FF(b,c,d,a,m[11],22,0x895cd7be);
152 FF(a,b,c,d,m[12], 7,0x6b901122);
153 FF(d,a,b,c,m[13],12,0xfd987193);
154 FF(c,d,a,b,m[14],17,0xa679438e);
155 FF(b,c,d,a,m[15],22,0x49b40821);
156
157 GG(a,b,c,d,m[1], 5,0xf61e2562);
158 GG(d,a,b,c,m[6], 9,0xc040b340);
159 GG(c,d,a,b,m[11],14,0x265e5a51);
160 GG(b,c,d,a,m[0], 20,0xe9b6c7aa);
161 GG(a,b,c,d,m[5], 5,0xd62f105d);
162 GG(d,a,b,c,m[10], 9,0x02441453);
163 GG(c,d,a,b,m[15],14,0xd8a1e681);
164 GG(b,c,d,a,m[4], 20,0xe7d3fbc8);
165 GG(a,b,c,d,m[9], 5,0x21e1cde6);
166 GG(d,a,b,c,m[14], 9,0xc33707d6);
167 GG(c,d,a,b,m[3], 14,0xf4d50d87);
168 GG(b,c,d,a,m[8], 20,0x455a14ed);
169 GG(a,b,c,d,m[13], 5,0xa9e3e905);
170 GG(d,a,b,c,m[2], 9,0xfcefa3f8);
171 GG(c,d,a,b,m[7], 14,0x676f02d9);
172 GG(b,c,d,a,m[12],20,0x8d2a4c8a);
173
174 HH(a,b,c,d,m[5], 4,0xfffa3942);
175 HH(d,a,b,c,m[8], 11,0x8771f681);
176 HH(c,d,a,b,m[11],16,0x6d9d6122);
177 HH(b,c,d,a,m[14],23,0xfde5380c);
178 HH(a,b,c,d,m[1], 4,0xa4beea44);
179 HH(d,a,b,c,m[4], 11,0x4bdecfa9);
180 HH(c,d,a,b,m[7], 16,0xf6bb4b60);
181 HH(b,c,d,a,m[10],23,0xbebfbc70);
182 HH(a,b,c,d,m[13], 4,0x289b7ec6);
183 HH(d,a,b,c,m[0], 11,0xeaa127fa);
184 HH(c,d,a,b,m[3], 16,0xd4ef3085);
185 HH(b,c,d,a,m[6], 23,0x04881d05);
186 HH(a,b,c,d,m[9], 4,0xd9d4d039);
187 HH(d,a,b,c,m[12],11,0xe6db99e5);
188 HH(c,d,a,b,m[15],16,0x1fa27cf8);
189 HH(b,c,d,a,m[2], 23,0xc4ac5665);
190
191 II(a,b,c,d,m[0], 6,0xf4292244);
192 II(d,a,b,c,m[7], 10,0x432aff97);
193 II(c,d,a,b,m[14],15,0xab9423a7);
194 II(b,c,d,a,m[5], 21,0xfc93a039);
195 II(a,b,c,d,m[12], 6,0x655b59c3);
196 II(d,a,b,c,m[3], 10,0x8f0ccc92);
197 II(c,d,a,b,m[10],15,0xffeff47d);
198 II(b,c,d,a,m[1], 21,0x85845dd1);
199 II(a,b,c,d,m[8], 6,0x6fa87e4f);
200 II(d,a,b,c,m[15],10,0xfe2ce6e0);
201 II(c,d,a,b,m[6], 15,0xa3014314);
202 II(b,c,d,a,m[13],21,0x4e0811a1);
203 II(a,b,c,d,m[4], 6,0xf7537e82);
204 II(d,a,b,c,m[11],10,0xbd3af235);
205 II(c,d,a,b,m[2], 15,0x2ad7d2bb);
206 II(b,c,d,a,m[9], 21,0xeb86d391);
207
208 ctx->state[0] += a;
209 ctx->state[1] += b;
210 ctx->state[2] += c;
211 ctx->state[3] += d;
212}
#define II(a, b, c, d, m, s, t)
Definition: md5_hash.cpp:26
#define FF(a, b, c, d, m, s, t)
Definition: md5_hash.cpp:20
#define HH(a, b, c, d, m, s, t)
Definition: md5_hash.cpp:24
#define GG(a, b, c, d, m, s, t)
Definition: md5_hash.cpp:22

References FF, GG, HH, II, and MD5_HASH::MD5_CTX::state.

Referenced by md5_final(), and md5_update().

◆ md5_update()

void MD5_HASH::md5_update ( MD5_CTX ctx,
uint8_t  data[],
uint32_t  len 
)
private

Definition at line 228 of file md5_hash.cpp.

229{
230 for( uint32_t i = 0; i < len; ++i )
231 {
232 ctx->data[ctx->datalen] = data[i];
233 ctx->datalen++;
234
235 if( ctx->datalen == 64 )
236 {
237 md5_transform( ctx,ctx->data );
238 DBL_INT_ADD( ctx->bitlen[0], ctx->bitlen[1], 512 );
239 ctx->datalen = 0;
240 }
241 }
242}

References MD5_HASH::MD5_CTX::bitlen, MD5_HASH::MD5_CTX::data, MD5_HASH::MD5_CTX::datalen, DBL_INT_ADD, and md5_transform().

Referenced by Hash().

◆ operator!=()

bool MD5_HASH::operator!= ( const MD5_HASH aOther) const

Definition at line 91 of file md5_hash.cpp.

92{
93 return ( memcmp( m_hash, aOther.m_hash, 16 ) != 0 );
94}

References m_hash.

◆ operator=()

MD5_HASH & MD5_HASH::operator= ( const MD5_HASH aOther)

Definition at line 48 of file md5_hash.cpp.

49{
50 m_valid = aOther.m_valid;
51 m_ctx = aOther.m_ctx;
52 memcpy( m_hash, aOther.m_hash, 16 );
53
54 return *this;
55}

References m_ctx, m_hash, and m_valid.

◆ operator==()

bool MD5_HASH::operator== ( const MD5_HASH aOther) const

Definition at line 85 of file md5_hash.cpp.

86{
87 return ( memcmp( m_hash, aOther.m_hash, 16 ) == 0 );
88}

References m_hash.

◆ SetValid()

void MD5_HASH::SetValid ( bool  aValid)
inline

Definition at line 26 of file md5_hash.h.

26{ m_valid = aValid; }

References m_valid.

Member Data Documentation

◆ m_ctx

MD5_CTX MD5_HASH::m_ctx
private

Definition at line 54 of file md5_hash.h.

Referenced by Finalize(), Hash(), Init(), MD5_HASH(), and operator=().

◆ m_hash

uint8_t MD5_HASH::m_hash[16]
private

Definition at line 55 of file md5_hash.h.

Referenced by Finalize(), Format(), Init(), MD5_HASH(), operator!=(), operator=(), and operator==().

◆ m_valid

bool MD5_HASH::m_valid
private

Definition at line 53 of file md5_hash.h.

Referenced by Finalize(), Init(), IsValid(), MD5_HASH(), operator=(), and SetValid().


The documentation for this class was generated from the following files: