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Curve P-192: The modulus for this curve is p = 2 192 - 2 64 - 1. Every integer A less than p2 can be written A = A5 � 2320 + A4 � 2256 + A3 � 2192 + A2 � 2128 + A1 � 264 + A0, where each Ai is a 64-bit integer. The expression for B is B := T + S1 + S2 + S3 mod p; where the 192-bit terms are given by T = A2 � 2128 + A1 � 264 + A0 S1 =
A3 � 264 + A3
S2 = A4 � 2128 + A4 � 264
S3 = A5 � 2128 + A5 � 264 + A5.
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