group.hash segmentation fault

[nikosft]

The following code produces segmentation fault (with 2.7-dev):

from charm.toolbox.pairinggroup import PairingGroup,G1
group = PairingGroup('SS1024')
ID1 = "This is an id"
k = group.hash(ID1,G1)

The fault is not produced when the group SS512 is used

[jakinyele]

Ok, will debug this. Thanks!

[doughgle]

Reproducing the segfault with @nikosft's code and analysing the core dump in gdb gives the following stack trace:

(gdb) bt
#0  0x00007f9600b697dc in sha256_block_data_order_avx2 () from /usr/local/lib/libcrypto.so.1.1
#1  0x00007f9600b6ade8 in SHA256_Update () from /usr/local/lib/libcrypto.so.1.1
#2  0x00007f960133e624 in hash_to_bytes (input_buf=input_buf@entry=0x7f9602c3b620 "This is an id", input_len=20181089, output_buf=output_buf@entry=0x7fff4827bb60 "", hash_len=1210563680, 
    hash_len@entry=127, hash_prefix=hash_prefix@entry=2 '\002') at charm/core/math/pairing/pairingmodule.c:409
#3  0x00007f960133f063 in Element_hash (self=<optimized out>, args=<optimized out>) at charm/core/math/pairing/pairingmodule.c:1377

Note that is using Python 3.5 and OpenSSL 1.1.

Out of time to dig deeper now, but could use some help. @jakinyele, any suggestions?

[matsevers]

Unfortunately this problem also occurs with me. I am using Python 3.8, OpenSSL 1.1.1 and pbc 0.5.14. In contrast SS512 works without problems.

@jakinyele Do you have an idea what the problem might be related to? Thanks in advance for your efforts!