Back to index

lightning-sunbird  0.9+nobinonly
Functions
dersubr.c File Reference
#include "secder.h"
#include <limits.h>
#include "secerr.h"

Go to the source code of this file.

Functions

int DER_LengthLength (uint32 len)
unsigned char * DER_StoreHeader (unsigned char *buf, unsigned int code, uint32 len)
SECStatus DER_SetInteger (PRArenaPool *arena, SECItem *it, int32 i)
SECStatus DER_SetUInteger (PRArenaPool *arena, SECItem *it, uint32 ui)
long DER_GetInteger (SECItem *it)
unsigned long DER_GetUInteger (SECItem *it)

Function Documentation

long DER_GetInteger ( SECItem *  it)

Definition at line 211 of file dersubr.c.

{
    long ival = 0;
    unsigned len = it->len;
    unsigned char *cp = it->data;
    unsigned long overflow = 0x1ffUL << (((sizeof(ival) - 1) * 8) - 1);
    unsigned long ofloinit;

    if (*cp & 0x80)
       ival = -1L;
    ofloinit = ival & overflow;

    while (len) {
       if ((ival & overflow) != ofloinit) {
           PORT_SetError(SEC_ERROR_BAD_DER);
           if (ival < 0) {
              return LONG_MIN;
           }
           return LONG_MAX;
       }
       ival = ival << 8;
       ival |= *cp++;
       --len;
    }
    return ival;
}

Here is the call graph for this function:

unsigned long DER_GetUInteger ( SECItem *  it)

Definition at line 243 of file dersubr.c.

{
    unsigned long ival = 0;
    unsigned len = it->len;
    unsigned char *cp = it->data;
    unsigned long overflow = 0xffUL << ((sizeof(ival) - 1) * 8);

    /* Cannot put a negative value into an unsigned container. */
    if (*cp & 0x80) {
       PORT_SetError(SEC_ERROR_BAD_DER);
       return 0;
    }

    while (len) {
       if (ival & overflow) {
           PORT_SetError(SEC_ERROR_BAD_DER);
           return ULONG_MAX;
       }
       ival = ival << 8;
       ival |= *cp++;
       --len;
    }
    return ival;
}

Here is the call graph for this function:

Definition at line 42 of file dersubr.c.

{
    if (len > 127) {
       if (len > 255) {
           if (len > 65535L) {
              if (len > 16777215L) {
                  return 5;
              } else {
                  return 4;
              }
           } else {
              return 3;
           }
       } else {
           return 2;
       }
    } else {
       return 1;
    }
}
SECStatus DER_SetInteger ( PRArenaPool arena,
SECItem *  it,
int32  i 
)

Definition at line 111 of file dersubr.c.

{
    unsigned char bb[4];
    unsigned len;

    bb[0] = (unsigned char) (i >> 24);
    bb[1] = (unsigned char) (i >> 16);
    bb[2] = (unsigned char) (i >> 8);
    bb[3] = (unsigned char) (i);

    /*
    ** Small integers are encoded in a single byte. Larger integers
    ** require progressively more space.
    */
    if (i < -128) {
       if (i < -32768L) {
           if (i < -8388608L) {
              len = 4;
           } else {
              len = 3;
           }
       } else {
           len = 2;
       }
    } else if (i > 127) {
       if (i > 32767L) {
           if (i > 8388607L) {
              len = 4;
           } else {
              len = 3;
           }
       } else {
           len = 2;
       }
    } else {
       len = 1;
    }
    it->data = (unsigned char*) PORT_ArenaAlloc(arena, len);
    if (!it->data) {
       return SECFailure;
    }
    it->len = len;
    PORT_Memcpy(it->data, bb + (4 - len), len);
    return SECSuccess;
}

Here is the call graph for this function:

SECStatus DER_SetUInteger ( PRArenaPool arena,
SECItem *  it,
uint32  ui 
)

Definition at line 162 of file dersubr.c.

{
    unsigned char bb[5];
    int len;

    bb[0] = 0;
    bb[1] = (unsigned char) (ui >> 24);
    bb[2] = (unsigned char) (ui >> 16);
    bb[3] = (unsigned char) (ui >> 8);
    bb[4] = (unsigned char) (ui);

    /*
    ** Small integers are encoded in a single byte. Larger integers
    ** require progressively more space.
    */
    if (ui > 0x7f) {
       if (ui > 0x7fff) {
           if (ui > 0x7fffffL) {
              if (ui >= 0x80000000L) {
                  len = 5;
              } else {
                  len = 4;
              }
           } else {
              len = 3;
           }
       } else {
           len = 2;
       }
    } else {
       len = 1;
    }

    it->data = (unsigned char *)PORT_ArenaAlloc(arena, len);
    if (it->data == NULL) {
       return SECFailure;
    }

    it->len = len;
    PORT_Memcpy(it->data, bb + (sizeof(bb) - len), len);

    return SECSuccess;
}

Here is the call graph for this function:

unsigned char* DER_StoreHeader ( unsigned char *  buf,
unsigned int  code,
uint32  len 
)

Definition at line 64 of file dersubr.c.

{
    unsigned char b[4];

    b[0] = (unsigned char)(len >> 24);
    b[1] = (unsigned char)(len >> 16);
    b[2] = (unsigned char)(len >> 8);
    b[3] = (unsigned char)len;
    if ((code & DER_TAGNUM_MASK) == DER_SET
       || (code & DER_TAGNUM_MASK) == DER_SEQUENCE)
       code |= DER_CONSTRUCTED;
    *buf++ = code;
    if (len > 127) {
       if (len > 255) {
           if (len > 65535) {
              if (len > 16777215) {
                  *buf++ = 0x84;
                  *buf++ = b[0];
                  *buf++ = b[1];
                  *buf++ = b[2];
                  *buf++ = b[3];
              } else {
                  *buf++ = 0x83;
                  *buf++ = b[1];
                  *buf++ = b[2];
                  *buf++ = b[3];
              }
           } else {
              *buf++ = 0x82;
              *buf++ = b[2];
              *buf++ = b[3];
           }
       } else {
           *buf++ = 0x81;
           *buf++ = b[3];
       }
    } else {
       *buf++ = b[3];
    }
    return buf;
}