Fix incrementing function of gcm mode #1610
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* nist 800-38d specify inc32(X) as incrementing function in gctr. * inc32(X) means: The output of incrementing the right-most 32 bits * of the bit string X, regarded as the binary representation of an *integer, by 1 modulo 2s.
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nist 800-38d 6.2 Incrementing Function & 6.5 GCTR Function