static void GCM_wrap()

in src/gcm.c [116:133]

• 14 lines of code
• 3 McCabe index (conditional complexity)

static void GCM_wrap(gcm *g)
{
    /* Finish off GHASH */
    int i;
    int j;
    unsign32 F[4];
    uchar L[16];

    /* convert lengths from bytes to bits */
    F[0]=(g->lenA[0]<<3)|(g->lenA[1]&0xE0000000)>>29;
    F[1]=g->lenA[1]<<3;
    F[2]=(g->lenC[0]<<3)|(g->lenC[1]&0xE0000000)>>29;
    F[3]=g->lenC[1]<<3;
    for (i=j=0; i<NB; i++,j+=4) unpack(F[i],&L[j]);

    for (i=0; i<16; i++) g->stateX[i]^=L[i];
    gf2mul(g);
}