"""Make unit test for poly1305_accumulate()"""

import struct
from hashlib import sha1


from common import counter, make_main, split32


def make_test(term1, term2):

    assert term1 < 2**(32*5)
    assert term2 < 2**(32*5)

    t1_split = split32(term1, 5)
    t2_split = split32(term2, 5)
    res_split = split32(term1 + term2, 5)

    print("")
    print("void test_%d() {" % next(counter))
    print("    uint32_t h[5] = {" + ",".join(t1_split) + "};")
    print("    uint32_t m[5] = {" + ",".join(t2_split) + "};")
    print("    uint32_t w[5] = {" + ",".join(res_split) + "};")

    print("    poly1305_accumulate(h, m);")
    print("    assert(0 == memcmp(h, w, sizeof(h)));")
    print("}")
    print("")


print("#ifdef NDEBUG")
print("#undef NDEBUG")
print("#endif")
print("#include <assert.h>")
print("#include <string.h>")
print("#include <stdint.h>")
print("#include <stdio.h>")
print()
print("void poly1305_accumulate(uint32_t h[5], const uint32_t m[5]);")

make_test(0, 0xFFFFFFFFFFFFFFFFFFF)
make_test(0xFFFFFFFFFFFFFFFFFFF, 0)
make_test(2**(32*5)-2, 1)
make_test(1, 2**(32*5)-2)

for i in range(100):
    prng1 = sha1(struct.pack('<II', 0, i)).digest()
    prng2 = sha1(struct.pack('<II', 1, i)).digest()
    term1 = term2 = 0
    for piece in range(5):
        term1 = (term1 << 32) + struct.unpack('<I', prng1[piece*4:(piece+1)*4])[0]
        term2 = (term2 << 32) + struct.unpack('<I', prng2[piece*4:(piece+1)*4])[0]
    if term1 + term2 >= 2**(32*5):
        continue
    make_test(term1, term2)

make_main()