pkcs7: PKCS #7 padding in Haskell
Implements PKCS #7 padding. This implements the PKCS #7 padding scheme. This scheme is defined in RFC 5652, section 6.3. Strings will be padded out to multiples of the block size; for example, a 5-byte string with an 8-byte block size will have three bytes of padding added. If the length is already a multiple of the block size, an entire block size worth of padding is added. The padding bytes are all set to the number of padding bytes. Returning to the previous example, the padding string would be three bytes of the byte 0x03. Unpadding checks the length and padding, and if this is valid, strips off the padding.
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| Versions [RSS] | 1.0.0.0, 1.0.0.1 |
|---|---|
| Dependencies | base (>4.5 && <5), bytestring (>=0.10 && <1.0) [details] |
| License | MIT |
| Author | K. Isom |
| Maintainer | coder@kyleisom.net |
| Category | Crypto |
| Home page | https://github.com/kisom/pkcs7 |
| Source repo | head: git clone https://github.com/kisom/pkcs7 |
| Uploaded | by kisom at 2015-08-14T04:10:01Z |
| Distributions | |
| Reverse Dependencies | 1 direct, 0 indirect [details] |
| Downloads | 1508 total (1 in the last 30 days) |
| Rating | (no votes yet) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Last success reported on 2015-08-14 [all 1 reports] |
Readme for pkcs7-1.0.0.1
[back to package description]pkcs7
This implements the PKCS #7 padding scheme. This scheme is defined in RFC 5652, section 6.3.
Strings will be padded out to multiples of the block size; for example, a 5-byte string with an 8-byte block size will have three bytes of padding added. If the length is already a multiple of the block size, an entire block size worth of padding is added.
The padding bytes are all set to the number of padding bytes. Returning to the previous example, the padding string would be three bytes of the byte 0x03.
Unpadding checks the length and padding, and if this is valid, strips off the padding.
The following functions are defined for Strings:
pad: apply PKCS #7 padding assuming an AES block sizepadN: apply PKCS #7 padding, specifying the block sizeunpad: remove PKCS #7 padding assuming an AES block sizeunpadN: remove PKCS #7 padding, specifying the block size
The following functions are defined for ByteStrings:
padBytes: apply PKCS #7 padding assuming an AES block sizepadBytesN: apply PKCS #7 padding, specifying the block sizeunpadBytes: remove PKCS #7 padding assuming an AES block sizeunpadBytesN: remove PKCS #7 padding, specifying the block size
The unpadding functions return a Maybe a (where a is either a String
or ByteString, depending on the function). If there was a padding error,
Nothing is returned. Otherwise, Just the string is returned.