Sat Aug 6 00:40:05 2011

Asterisk developer's documentation


sha1.h File Reference

#include <stdint.h>

Go to the source code of this file.

Data Structures

struct  SHA1Context

Defines

#define SHA1HashSize   20

Enumerations

enum  { shaSuccess = 0, shaNull, shaInputTooLong, shaStateError }

Functions

int SHA1Input (SHA1Context *, const uint8_t *, unsigned int)
int SHA1Reset (SHA1Context *)
int SHA1Result (SHA1Context *, uint8_t Message_Digest[SHA1HashSize])


Define Documentation

#define SHA1HashSize   20

Definition at line 48 of file sha1.h.


Enumeration Type Documentation

anonymous enum

Enumerator:
shaSuccess 
shaNull 
shaInputTooLong 
shaStateError 

Definition at line 40 of file sha1.h.

00041 {
00042     shaSuccess = 0,
00043     shaNull,            /* Null pointer parameter */
00044     shaInputTooLong,    /* input data too long */
00045     shaStateError       /* called Input after Result */
00046 };


Function Documentation

int SHA1Input ( SHA1Context ,
const uint8_t *  ,
unsigned  int 
)

Definition at line 183 of file sha1.c.

References context, SHA1ProcessMessageBlock(), shaNull, shaStateError, and shaSuccess.

Referenced by ast_sha1_hash().

00184 {
00185    if (!length) {
00186       return shaSuccess;
00187    }
00188 
00189    if (!context || !message_array) {
00190       return shaNull;
00191    }
00192 
00193    if (context->Computed) {
00194       context->Corrupted = shaStateError;
00195       return shaStateError;
00196    }
00197 
00198    if (context->Corrupted) {
00199       return context->Corrupted;
00200    }
00201 
00202    while (length-- && !context->Corrupted) {
00203       context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);
00204 
00205       context->Length_Low += 8;
00206       if (context->Length_Low == 0) {
00207          context->Length_High++;
00208          if (context->Length_High == 0) {
00209             /* Message is too long */
00210             context->Corrupted = 1;
00211          }
00212       }
00213 
00214       if (context->Message_Block_Index == 64) {
00215          SHA1ProcessMessageBlock(context);
00216       }
00217 
00218       message_array++;
00219    }
00220 
00221    return shaSuccess;
00222 }

int SHA1Reset ( SHA1Context  ) 

Definition at line 91 of file sha1.c.

References context, shaNull, and shaSuccess.

Referenced by ast_sha1_hash().

00092 {
00093    if (!context) {
00094       return shaNull;
00095    }
00096 
00097    context->Length_Low             = 0;
00098    context->Length_High            = 0;
00099    context->Message_Block_Index    = 0;
00100 
00101    context->Intermediate_Hash[0]   = 0x67452301;
00102    context->Intermediate_Hash[1]   = 0xEFCDAB89;
00103    context->Intermediate_Hash[2]   = 0x98BADCFE;
00104    context->Intermediate_Hash[3]   = 0x10325476;
00105    context->Intermediate_Hash[4]   = 0xC3D2E1F0;
00106 
00107    context->Computed               = 0;
00108    context->Corrupted              = 0;
00109 
00110    return shaSuccess;
00111 }

int SHA1Result ( SHA1Context ,
uint8_t  Message_Digest[SHA1HashSize] 
)

Definition at line 132 of file sha1.c.

References context, SHA1PadMessage(), shaNull, and shaSuccess.

Referenced by ast_sha1_hash().

00134 {
00135    int i;
00136 
00137    if (!context || !Message_Digest) {
00138       return shaNull;
00139    }
00140 
00141    if (context->Corrupted) {
00142       return context->Corrupted;
00143    }
00144 
00145    if (!context->Computed) {
00146       SHA1PadMessage(context);
00147       for (i = 0; i < 64; ++i) {
00148          /* message may be sensitive, clear it out */
00149          context->Message_Block[i] = 0;
00150       }
00151       context->Length_Low = 0;    /* and clear length */
00152       context->Length_High = 0;
00153       context->Computed = 1;
00154    }
00155 
00156    for (i = 0; i < SHA1HashSize; ++i) {
00157       Message_Digest[i] = context->Intermediate_Hash[i >> 2] >> 8 * ( 3 - ( i & 0x03 ) );
00158    }
00159 
00160    return shaSuccess;
00161 }


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