fp_prime_random_ex: make sure call-back function is not NULL
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@ -16,7 +16,7 @@ int fp_prime_random_ex(fp_int *a, int t, int size, int flags, tfm_prime_callback
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int res, err, bsize, maskOR_msb_offset;
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/* sanity check the input */
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if (size <= 1 || t <= 0 || t > FP_PRIME_SIZE) {
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if (size <= 1 || cb == NULL || t <= 0 || t > FP_PRIME_SIZE) {
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return FP_VAL;
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}
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