Topic: How long is needed as output buffer size used in wc_RsaSSL_Verify()?
I used wc_RsaSSL_Verify function for verifying with RSA Key. (the signature's size is 256 byte)
word32 output_len = 1073741824; // 2^30 unsigned char *output = (unsigned char *)malloc(output_len); memset(output, 0, sizeof(output_len)); ret = wc_RsaSSL_Verify( signature, sizeof(signature), output, output_len, &RSAkey );
I had changed output buffer's size to enough large until 2^29(536870912), but the function returned -131.
-131 is RSA_BUFFER_E, it means output is too small.
So I set output buffer size as 2^30, then the process is killed by SIGSEGV in system library.
Process 2093085 (temp) terminated SIGSEGV code=1 fltno=11 ip=0000000100076184(/usr/lib/ldqnx-64.so.2@__memset_isr+0x0000000000000064) mapaddr=0000000000076184. ref=0000000000000000
I think 2^29 is large enough, how long is needed? Is any precautions for using wc_RsaSSL_Verify()?