int PKCS15()

in src/rsa_support.c [143:167]

• 20 lines of code
• 5 McCabe index (conditional complexity)

int PKCS15(int sha,const octet *m,octet *w)
{
    int olen=w->max;
    int hlen=sha;
    int idlen=19;
    char h[64];
    octet H= {0,sizeof(h),h};

    if (olen<idlen+hlen+10) return 1;
    hashit(sha,m,-1,&H);

    OCT_empty(w);
    OCT_jbyte(w,0x00,1);
    OCT_jbyte(w,0x01,1);
    OCT_jbyte(w,0xff,olen-idlen-hlen-3);
    OCT_jbyte(w,0x00,1);

    if (hlen==32) OCT_jbytes(w,(char *)SHA256ID,idlen);
    if (hlen==48) OCT_jbytes(w,(char *)SHA384ID,idlen);
    if (hlen==64) OCT_jbytes(w,(char *)SHA512ID,idlen);

    OCT_joctet(w,&H);

    return 0;
}