PostgreSQL – MD5 Function

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The MD5 function is used to calculate the MD5 hash value of a given input string. MD5 (Message Digest Algorithm 5) is a widely used cryptographic hash function that produces a fixed-size 128-bit (16-byte) hash value, typically represented as a 32-character hexadecimal number.

The syntax of the MD5 function is as follows:

MD5(string)

where string is the input string for which you want to calculate the MD5 hash.

Here’s an example of how you might use the MD5 function in a SQL query:

SELECT MD5('Hello, World!') AS md5_hash;

In this example, the result would be the MD5 hash value 6cd3556deb0da54bca060b4c39479839, corresponding to the input string 'Hello, World!'.

The MD5 function is often used for hashing purposes, such as creating checksums or storing password hashes in a database. However, it’s important to note that MD5 is considered cryptographically broken and unsuitable for security-sensitive applications due to vulnerabilities that have been discovered over time.

For secure applications, it’s recommended to use more modern and secure hashing algorithms like SHA-256 or bcrypt. Additionally, PostgreSQL offers functions like SHA256 and crypt() for alternative hashing needs.

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