Description: Secure hash algorithm (Secure Hash Algorithm) is mainly applicable to digital signature standard (Digital Signature Standard DSS) which is defined by the digital signature algorithm (Digital Signature Algorithm DSA). For messages whose length is less than 2^64 bits, SHA1 generates a 160 bit message digest. When a message is received, the message digest can be used to verify the integrity of the data. In the process of transmission, the data is likely to change, then this will produce a different message digest. SHA1 has the following characteristics: could not recover the information from the message digest; two different messages will not have the same message digest (probability but there will be 1x10 ^ 48 of the same message digest, the general use of ignore).
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SHA1.C
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