Java security learning-Message Digest (messagedigest)

Messagedigest (Message Digest)

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Message DigestAlgorithmThere are mainly the following types:

Md2: The md2 message digest algorithm as defined in RFC 1319.

MD5: The MD5 message digest algorithm as defined in RFC 1321.

SHA-1: The secure hash algorithm, as defined in Secure Hash Standard, nist fips 180-1.

SHA-256,SHA-384, AndSHA-512: New hash algorithms for which the draft federal information processing standard 180-2,Secure Hash Standard (SHS)Is now available. SHA-256 is a 256-bit hash function intended to provide 128 bits of security against collision attacks, while SHA-512 is a 512-bit hash function intended to provide 256 bits of security. A 384-bit hash may be obtained by truncating the SHA-512 output.

We are familiar with MD5 and Sha.

We can use the following method to obtain the messagedigest instance.

Messagedigest MD = messagedigest. getintance ("MD5 ");