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Trott merged 2 commits into from
Sep 8, 2019
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typo: orignal -> original #2555

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typo: deterministially -> deterministically
nschonni Sep 8, 2019
e0b4644
typo: orignal -> original
nschonni Sep 8, 2019
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4 changes: 2 additions & 2 deletions locale/en/knowledge/cryptography/how-to-use-crypto-module.md
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Expand Up @@ -16,7 +16,7 @@ The crypto module is mostly useful as a tool for implementing [cryptographic pro

### What Is A Hash?

A hash is a fixed-length string of bits that is procedurally and deterministially generated from some arbitrary block of source data. Some important properties of these hashes (the type useful for cryptography) include:
A hash is a fixed-length string of bits that is procedurally and deterministically generated from some arbitrary block of source data. Some important properties of these hashes (the type useful for cryptography) include:

* **Fixed length:** This means that, no matter what the input, the length of the hash is the same. For example, SHA-256 hashes are always 256 bits long whether the input data is a few bits or a few gigabytes.

Expand Down Expand Up @@ -134,7 +134,7 @@ NODE PRO TIP: The `crypto.createCipheriv()` and `crypto.createDecipheriv()` meth
| aes192 | 24 byte (192 bits) | 16 byte (128 bits) |
| aes256 | 32 byte (256 bits) | 16 byte (128 bits) |

In the code above The user entered `key` is hashed using `SHA-256 encryption` which produces a 32 byte buffer by default, this buffered key is then used as the [cryptographic key](https://en.wikipedia.org/wiki/Key_(cryptography)) in the `crypto.createCipheriv()` and `crypto.createDecipheriv()` methods. The `iv` is also hashed with `SHA-256 encryption` and is 32 byte in size but all AES (CBC mode and CFB mode) take `iv` of exactly 16 byte (128 bits) therefor another Buffer `resizedIV` is used which contains the first 16 byte of orignal 32 byte `iv`.
In the code above The user entered `key` is hashed using `SHA-256 encryption` which produces a 32 byte buffer by default, this buffered key is then used as the [cryptographic key](https://en.wikipedia.org/wiki/Key_(cryptography)) in the `crypto.createCipheriv()` and `crypto.createDecipheriv()` methods. The `iv` is also hashed with `SHA-256 encryption` and is 32 byte in size but all AES (CBC mode and CFB mode) take `iv` of exactly 16 byte (128 bits) therefor another Buffer `resizedIV` is used which contains the first 16 byte of original 32 byte `iv`.

Using this script to encode a message looks like this:

Expand Down