A digital signature method based on rsa algorithm
A technology of RSA algorithm and digital signature, which is applied in key distribution, can solve the problems of low calculation efficiency of software modulo function, etc., and achieve the effect of fast listing and reducing chip cost
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[0027] The invention can make the L / 2-bit long modular multiplier calculate the L-bit long RSA private key operation, so as to reduce the chip cost, or use limited resources to meet market changes, and help the rapid development and listing of products. This algorithm can be used when it is necessary to use a small bit length modular multiplier to realize a large bit length RSA private key operation. Specific steps are as follows:
[0028] The following method is used when calculating CmodP:
[0029] 1. Divide C into two parts of equal length, record CH as the high L / 2 part, and CL as the low L / 2 part, so that the L-length C is split into two L / 2-length data, and C=CH<
[0030] 2. Further analysis of CH<
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