void sha1_lastBlock()

in src/sha1.c [110:140]

• 26 lines of code
• 4 McCabe index (conditional complexity)

void sha1_lastBlock(sha1_ctx_t *state, const void *block, uint16_t length){
    uint8_t lb[SHA1_BLOCK_BYTES]; /* local block */
    while(length>=SHA1_BLOCK_BITS){
        sha1_nextBlock(state, block);
        length -= SHA1_BLOCK_BITS;
        block = (uint8_t*)block + SHA1_BLOCK_BYTES;
    }
    state->length += length;
    memset(lb, 0, SHA1_BLOCK_BYTES);
    memcpy (lb, block, (length+7)>>3);

    /* set the final one bit */
    lb[length>>3] |= 0x80>>(length & 0x07);

    if (length>512-64-1){ /* not enouth space for 64bit length value */
        sha1_nextBlock(state, lb);
        state->length -= 512;
        memset(lb, 0, SHA1_BLOCK_BYTES);
    }
    /* store the 64bit length value */
#if defined LITTLE_ENDIAN
    /* this is now rolled up */
    uint8_t i;
    for (i=0; i<8; ++i){
        lb[56+i] = ((uint8_t*)&(state->length))[7-i];
    }
#elif defined BIG_ENDIAN
    *((uint64_t)&(lb[56])) = state->length;
#endif
    sha1_nextBlock(state, lb);
}