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RSA encryption/decryption

Simple routines for RSA encryption/decryption

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open System
open System.Security.Cryptography
open System.Text

// RSA encryption function
let RsaEncrypt (data : byte[]) (key : RSAParameters) (padding : bool) : byte[] =
    try
        let rsa = new RSACryptoServiceProvider()
        rsa.ImportParameters(key)
        rsa.Encrypt(data, padding)
    with
    | :? CryptographicException as e ->
        printfn "%A" e.Message
        Array.empty

// RSA decryption function
let RsaDecrypt (data : byte[]) (key : RSAParameters) (padding : bool) : byte[] =
    try
        let rsa = new RSACryptoServiceProvider()
        rsa.ImportParameters(key)
        rsa.Decrypt(data, padding)
    with
    | :? CryptographicException as e ->
        printfn "%A" e.Message
        Array.empty         
        
// Example
// ========================
let rsa = new RSACryptoServiceProvider(2048)
let publicPrivateKeyXML = rsa.ToXmlString(true)
rsa.FromXmlString(publicPrivateKeyXML)
let publicOnlyKeyXML = rsa.ToXmlString(false)
let plainText = "hello world"
let plainTextArray = System.Text.Encoding.ASCII.GetBytes(plainText)
let cipherArray = RsaEncrypt plainTextArray (rsa.ExportParameters(false)) false
let cipherText = System.Text.Encoding.ASCII.GetString(cipherArray)
let decryptedTextArray = RsaDecrypt (System.Text.Encoding.ASCII.GetBytes(cipherText)) (rsa.ExportParameters(true)) false
let decryptedText = System.Text.Encoding.ASCII.GetString(decryptedTextArray)
namespace System
namespace System.Security
namespace System.Security.Cryptography
namespace System.Text
val RsaEncrypt : data:byte [] -> key:RSAParameters -> padding:bool -> byte []

Full name: Script.RsaEncrypt
val data : byte []
Multiple items
val byte : value:'T -> byte (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.byte

--------------------
type byte = Byte

Full name: Microsoft.FSharp.Core.byte
val key : RSAParameters
type RSAParameters =
  struct
    val Exponent : byte[]
    val Modulus : byte[]
    val P : byte[]
    val Q : byte[]
    val DP : byte[]
    val DQ : byte[]
    val InverseQ : byte[]
    val D : byte[]
  end

Full name: System.Security.Cryptography.RSAParameters
val padding : bool
type bool = Boolean

Full name: Microsoft.FSharp.Core.bool
val rsa : RSACryptoServiceProvider
Multiple items
type RSACryptoServiceProvider =
  inherit RSA
  new : unit -> RSACryptoServiceProvider + 3 overloads
  member CspKeyContainerInfo : CspKeyContainerInfo
  member Decrypt : rgb:byte[] * fOAEP:bool -> byte[]
  member DecryptValue : rgb:byte[] -> byte[]
  member Encrypt : rgb:byte[] * fOAEP:bool -> byte[]
  member EncryptValue : rgb:byte[] -> byte[]
  member ExportCspBlob : includePrivateParameters:bool -> byte[]
  member ExportParameters : includePrivateParameters:bool -> RSAParameters
  member ImportCspBlob : keyBlob:byte[] -> unit
  member ImportParameters : parameters:RSAParameters -> unit
  ...

Full name: System.Security.Cryptography.RSACryptoServiceProvider

--------------------
RSACryptoServiceProvider() : unit
RSACryptoServiceProvider(dwKeySize: int) : unit
RSACryptoServiceProvider(parameters: CspParameters) : unit
RSACryptoServiceProvider(dwKeySize: int, parameters: CspParameters) : unit
RSACryptoServiceProvider.ImportParameters(parameters: RSAParameters) : unit
RSACryptoServiceProvider.Encrypt(rgb: byte [], fOAEP: bool) : byte []
Multiple items
type CryptographicException =
  inherit SystemException
  new : unit -> CryptographicException + 4 overloads

Full name: System.Security.Cryptography.CryptographicException

--------------------
CryptographicException() : unit
CryptographicException(message: string) : unit
CryptographicException(hr: int) : unit
CryptographicException(format: string, insert: string) : unit
CryptographicException(message: string, inner: exn) : unit
val e : CryptographicException
val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn
property Exception.Message: string
type Array =
  member Clone : unit -> obj
  member CopyTo : array:Array * index:int -> unit + 1 overload
  member GetEnumerator : unit -> IEnumerator
  member GetLength : dimension:int -> int
  member GetLongLength : dimension:int -> int64
  member GetLowerBound : dimension:int -> int
  member GetUpperBound : dimension:int -> int
  member GetValue : [<ParamArray>] indices:int[] -> obj + 7 overloads
  member Initialize : unit -> unit
  member IsFixedSize : bool
  ...

Full name: System.Array
val empty<'T> : 'T []

Full name: Microsoft.FSharp.Collections.Array.empty
val RsaDecrypt : data:byte [] -> key:RSAParameters -> padding:bool -> byte []

Full name: Script.RsaDecrypt
RSACryptoServiceProvider.Decrypt(rgb: byte [], fOAEP: bool) : byte []
val rsa : RSACryptoServiceProvider

Full name: Script.rsa
val publicPrivateKeyXML : string

Full name: Script.publicPrivateKeyXML
RSA.ToXmlString(includePrivateParameters: bool) : string
RSA.FromXmlString(xmlString: string) : unit
val publicOnlyKeyXML : string

Full name: Script.publicOnlyKeyXML
val plainText : string

Full name: Script.plainText
val plainTextArray : byte []

Full name: Script.plainTextArray
type Encoding =
  member BodyName : string
  member Clone : unit -> obj
  member CodePage : int
  member DecoderFallback : DecoderFallback with get, set
  member EncoderFallback : EncoderFallback with get, set
  member EncodingName : string
  member Equals : value:obj -> bool
  member GetByteCount : chars:char[] -> int + 3 overloads
  member GetBytes : chars:char[] -> byte[] + 5 overloads
  member GetCharCount : bytes:byte[] -> int + 2 overloads
  ...

Full name: System.Text.Encoding
property Encoding.ASCII: Encoding
Encoding.GetBytes(s: string) : byte []
Encoding.GetBytes(chars: char []) : byte []
Encoding.GetBytes(chars: char [], index: int, count: int) : byte []
Encoding.GetBytes(chars: nativeptr<char>, charCount: int, bytes: nativeptr<byte>, byteCount: int) : int
Encoding.GetBytes(s: string, charIndex: int, charCount: int, bytes: byte [], byteIndex: int) : int
Encoding.GetBytes(chars: char [], charIndex: int, charCount: int, bytes: byte [], byteIndex: int) : int
val cipherArray : byte []

Full name: Script.cipherArray
RSACryptoServiceProvider.ExportParameters(includePrivateParameters: bool) : RSAParameters
val cipherText : string

Full name: Script.cipherText
Encoding.GetString(bytes: byte []) : string
Encoding.GetString(bytes: byte [], index: int, count: int) : string
val decryptedTextArray : byte []

Full name: Script.decryptedTextArray
val decryptedText : string

Full name: Script.decryptedText
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More information

Link:http://fssnip.net/7WE
Posted:2 months ago
Author:Dr. Martin Lockstrom
Tags: #decryption , #encryption , #rsa