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OAEPOptions // If we don't get any error from the `VerifyPSS` method, that means our // signature is validįmt. The first argument is an optional random data generator (the rand.Reader we used before) // we can set this value as nil // The OAEPOptions in the end signify that we encrypted the data using OAEP, and that we used // SHA256 to hash the input.ĭecryptedBytes, err := privateKey. We use the crypto/rsa standard library for generating the keys, and the crypto/rand library for generating random numbers. These keys are randomly generated, and will be used for all following operations. The first thing we want to do is generate the public and private key pairs. The details of how the keys are generated, and how information is encrypted and decrypted is beyond the scope of this post, but if you want to delve into the details, there is a great video on the topic Key Generation They can then encrypt any information they want to send us, and the only way to access this information is by using our private key to decrypt it. This means we can give our public key to whoever we want.
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The private key can be used to decrypt any piece of data that was encrypted by it’s corresponding public key.
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The public key can be used to encrypt any arbitrary piece of data, but cannot decrypt it. The public and private keys are generated together and form a key pair. RSA works by generating a public and a private key. If you want to skip the explanation and just see the working source code, you can view it here RSA Encryption In A Nutshell In this case, it’s easy for anyone to encrypt a piece of data, but only possible for someone with the correct “key” to decrypt it. It is an asymmetric encryption algorithm, which is just another way to say “one-way”. RSA (Rivest–Shamir–Adleman) encryption is one of the most widely used algorithms for secure data encryption. This post will describe what the RSA algorithm does, and how we can implement it in Go. Implementing RSA Encryption and Signing in Golang (With Examples) April 08, 2020