int s2n_hmac_xor_pad_size()

in crypto/s2n_hmac.c [124:141]

• 18 lines of code
• 10 McCabe index (conditional complexity)

int s2n_hmac_xor_pad_size(s2n_hmac_algorithm hmac_alg, uint16_t *xor_pad_size)
{
    POSIX_ENSURE(S2N_MEM_IS_WRITABLE_CHECK(xor_pad_size, sizeof(*xor_pad_size)), S2N_ERR_PRECONDITION_VIOLATION);
    switch(hmac_alg) {
    case S2N_HMAC_NONE:       *xor_pad_size = 64;   break;
    case S2N_HMAC_MD5:        *xor_pad_size = 64;   break;
    case S2N_HMAC_SHA1:       *xor_pad_size = 64;   break;
    case S2N_HMAC_SHA224:     *xor_pad_size = 64;   break;
    case S2N_HMAC_SHA256:     *xor_pad_size = 64;   break;
    case S2N_HMAC_SHA384:     *xor_pad_size = 128;  break;
    case S2N_HMAC_SHA512:     *xor_pad_size = 128;  break;
    case S2N_HMAC_SSLv3_MD5:  *xor_pad_size = 48;   break;
    case S2N_HMAC_SSLv3_SHA1: *xor_pad_size = 40;   break;
    default:
        POSIX_BAIL(S2N_ERR_HMAC_INVALID_ALGORITHM);
    }
    return S2N_SUCCESS;
}