MD5 Windows Phone / Silverlight

// Source http://thomasnigro.fr/blog/2013/04/05/convertir-un-string-en-md5-sous-windows-phone/
// Just See too: http://codeit.pro
using System;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ''NOM_DU_PROJET''.Classes
{
    public class MD5CryptoServiceProvider : MD5
    {
        public MD5CryptoServiceProvider()
            : base()
        {
        }
    }

    public class MD5 : IDisposable
    {
        static public MD5 Create(string hashName)
        {
            if (hashName == "MD5")
                return new MD5();
            else
                throw new NotSupportedException();
        }

        static public string GetMd5String(String source)
        {
            MD5 md = MD5CryptoServiceProvider.Create();
            byte[] hash;

            //Create a new instance of ASCIIEncoding to
            //convert the string into an array of Unicode bytes.
            UTF8Encoding enc = new UTF8Encoding();
            //            ASCIIEncoding enc = new ASCIIEncoding();

            //Convert the string into an array of bytes.
            byte[] buffer = enc.GetBytes(source);

            //Create the hash value from the array of bytes.
            hash = md.ComputeHash(buffer);

            StringBuilder sb = new StringBuilder();
            foreach (byte b in hash)
                sb.Append(b.ToString("x2"));
            return sb.ToString();
        }

        static public MD5 Create()
        {
            return new MD5();
        }

        #region base implementation of the MD5
        #region constants
        private const byte S11 = 7;
        private const byte S12 = 12;
        private const byte S13 = 17;
        private const byte S14 = 22;
        private const byte S21 = 5;
        private const byte S22 = 9;
        private const byte S23 = 14;
        private const byte S24 = 20;
        private const byte S31 = 4;
        private const byte S32 = 11;
        private const byte S33 = 16;
        private const byte S34 = 23;
        private const byte S41 = 6;
        private const byte S42 = 10;
        private const byte S43 = 15;
        private const byte S44 = 21;
        static private byte[] PADDING = new byte[] {
              0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
              0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
              0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
             };
        #endregion

        #region F, G, H and I are basic MD5 functions.
        static private uint F(uint x, uint y, uint z)
        {
            return (((x) & (y)) | ((~x) & (z)));
        }
        static private uint G(uint x, uint y, uint z)
        {
            return (((x) & (z)) | ((y) & (~z)));
        }
        static private uint H(uint x, uint y, uint z)
        {
            return ((x) ^ (y) ^ (z));
        }
        static private uint I(uint x, uint y, uint z)
        {
            return ((y) ^ ((x) | (~z)));
        }
        #endregion

        #region rotates x left n bits.
        ///
        /// rotates x left n bits.
        ///
        ///
        ///
        ///
        static private uint ROTATE_LEFT(uint x, byte n)
        {
            return (((x) << (n)) | ((x) >> (32 - (n))));
        }
        #endregion

        #region FF, GG, HH, and II transformations
        /// FF, GG, HH, and II transformations
        /// for rounds 1, 2, 3, and 4.
        /// Rotation is separate from addition to prevent recomputation.
        static private void FF(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
        {
            (a) += F((b), (c), (d)) + (x) + (uint)(ac);
            (a) = ROTATE_LEFT((a), (s));
            (a) += (b);
        }
        static private void GG(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
        {
            (a) += G((b), (c), (d)) + (x) + (uint)(ac);
            (a) = ROTATE_LEFT((a), (s));
            (a) += (b);
        }
        static private void HH(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
        {
            (a) += H((b), (c), (d)) + (x) + (uint)(ac);
            (a) = ROTATE_LEFT((a), (s));
            (a) += (b);
        }
        static private void II(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
        {
            (a) += I((b), (c), (d)) + (x) + (uint)(ac);
            (a) = ROTATE_LEFT((a), (s));
            (a) += (b);
        }
        #endregion

        #region context info
        ///
        /// state (ABCD)
        ///
        uint[] state = new uint[4];

        ///
        /// number of bits, modulo 2^64 (lsb first)
        ///
        uint[] count = new uint[2];

        ///
        /// input buffer
        ///
        byte[] buffer = new byte[64];
        #endregion

        internal MD5()
        {
            Initialize();
        }

        ///
        /// MD5 initialization. Begins an MD5 operation, writing a new context.
        ///
        ///
        /// The RFC named it "MD5Init"
        ///
        public virtual void Initialize()
        {
            count[0] = count[1] = 0;

            // Load magic initialization constants.
            state[0] = 0x67452301;
            state[1] = 0xefcdab89;
            state[2] = 0x98badcfe;
            state[3] = 0x10325476;
        }

        ///
        /// MD5 block update operation. Continues an MD5 message-digest
        /// operation, processing another message block, and updating the
        /// context.
        ///
        ///
        ///
        ///
        /// The RFC Named it MD5Update
        protected virtual void HashCore(byte[] input, int offset, int count)
        {
            int i;
            int index;
            int partLen;

            // Compute number of bytes mod 64
            index = (int)((this.count[0] >> 3) & 0x3F);

            // Update number of bits
            if ((this.count[0] += (uint)((uint)count << 3)) < ((uint)count << 3))
                this.count[1]++;
            this.count[1] += ((uint)count >> 29);

            partLen = 64 - index;

            // Transform as many times as possible.
            if (count >= partLen)
            {
                Buffer.BlockCopy(input, offset, this.buffer, index, partLen);
                Transform(this.buffer, 0);

                for (i = partLen; i + 63 < count; i += 64)
                    Transform(input, offset + i);

                index = 0;
            }
            else
                i = 0;

            // Buffer remaining input
            Buffer.BlockCopy(input, offset + i, this.buffer, index, count - i);
        }

        ///
        /// MD5 finalization. Ends an MD5 message-digest operation, writing the
        /// the message digest and zeroizing the context.
        ///
        /// message digest
        /// The RFC named it MD5Final
        protected virtual byte[] HashFinal()
        {
            byte[] digest = new byte[16];
            byte[] bits = new byte[8];
            int index, padLen;

            // Save number of bits
            Encode(bits, 0, this.count, 0, 8);

            // Pad out to 56 mod 64.
            index = (int)((uint)(this.count[0] >> 3) & 0x3f);
            padLen = (index < 56) ? (56 - index) : (120 - index);
            HashCore(PADDING, 0, padLen);

            // Append length (before padding)
            HashCore(bits, 0, 8);

            // Store state in digest
            Encode(digest, 0, state, 0, 16);

            // Zeroize sensitive information.
            count[0] = count[1] = 0;
            state[0] = 0;
            state[1] = 0;
            state[2] = 0;
            state[3] = 0;

            // initialize again, to be ready to use
            Initialize();

            return digest;
        }

        ///
        /// MD5 basic transformation. Transforms state based on 64 bytes block.
        ///
        ///
        ///
        private void Transform(byte[] block, int offset)
        {
            uint a = state[0], b = state[1], c = state[2], d = state[3];
            uint[] x = new uint[16];
            Decode(x, 0, block, offset, 64);

            // Round 1
            FF(ref a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
            FF(ref d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
            FF(ref c, d, a, b, x[2], S13, 0x242070db); /* 3 */
            FF(ref b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
            FF(ref a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
            FF(ref d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
            FF(ref c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
            FF(ref b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
            FF(ref a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
            FF(ref d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
            FF(ref c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
            FF(ref b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
            FF(ref a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
            FF(ref d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
            FF(ref c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
            FF(ref b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

            // Round 2
            GG(ref a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
            GG(ref d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
            GG(ref c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
            GG(ref b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
            GG(ref a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
            GG(ref d, a, b, c, x[10], S22, 0x2441453); /* 22 */
            GG(ref c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
            GG(ref b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
            GG(ref a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
            GG(ref d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
            GG(ref c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
            GG(ref b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
            GG(ref a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
            GG(ref d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
            GG(ref c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
            GG(ref b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

            // Round 3
            HH(ref a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
            HH(ref d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
            HH(ref c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
            HH(ref b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
            HH(ref a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
            HH(ref d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
            HH(ref c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
            HH(ref b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
            HH(ref a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
            HH(ref d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
            HH(ref c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
            HH(ref b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
            HH(ref a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
            HH(ref d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
            HH(ref c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
            HH(ref b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */

            // Round 4
            II(ref a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
            II(ref d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
            II(ref c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
            II(ref b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
            II(ref a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
            II(ref d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
            II(ref c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
            II(ref b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
            II(ref a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
            II(ref d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
            II(ref c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
            II(ref b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
            II(ref a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
            II(ref d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
            II(ref c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
            II(ref b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */

            state[0] += a;
            state[1] += b;
            state[2] += c;
            state[3] += d;

            // Zeroize sensitive information.
            for (int i = 0; i < x.Length; i++)
                x[i] = 0;
        }

        ///
        /// Encodes input (uint) into output (byte). Assumes len is
        ///  multiple of 4.
        ///
        ///
        ///
        ///
        ///
        ///
        private static void Encode(byte[] output, int outputOffset, uint[] input, int inputOffset, int count)
        {
            int i, j;
            int end = outputOffset + count;
            for (i = inputOffset, j = outputOffset; j < end; i++, j += 4)
            {
                output[j] = (byte)(input[i] & 0xff);
                output[j + 1] = (byte)((input[i] >> 8) & 0xff);
                output[j + 2] = (byte)((input[i] >> 16) & 0xff);
                output[j + 3] = (byte)((input[i] >> 24) & 0xff);
            }
        }

        ///
        /// Decodes input (byte) into output (uint). Assumes len is
        /// a multiple of 4.
        ///
        ///
        ///
        ///
        ///
        ///
        static private void Decode(uint[] output, int outputOffset, byte[] input, int inputOffset, int count)
        {
            int i, j;
            int end = inputOffset + count;
            for (i = outputOffset, j = inputOffset; j < end; i++, j += 4)
                output[i] = ((uint)input[j]) | (((uint)input[j + 1]) << 8) | (((uint)input[j + 2]) << 16) | (((uint)input[j + 3]) << 24);
        }
        #endregion

        #region expose the same interface as the regular MD5 object

        protected byte[] HashValue;
        protected int State;
        public virtual bool CanReuseTransform
        {
            get
            {
                return true;
            }
        }

        public virtual bool CanTransformMultipleBlocks
        {
            get
            {
                return true;
            }
        }
        public virtual byte[] Hash
        {
            get
            {
                if (this.State != 0)
                    throw new InvalidOperationException();
                return (byte[])HashValue.Clone();
            }
        }
        public virtual int HashSize
        {
            get
            {
                return HashSizeValue;
            }
        }
        protected int HashSizeValue = 128;

        public virtual int InputBlockSize
        {
            get
            {
                return 1;
            }
        }
        public virtual int OutputBlockSize
        {
            get
            {
                return 1;
            }
        }

        public void Clear()
        {
            Dispose(true);
        }

        public byte[] ComputeHash(byte[] buffer)
        {
            return ComputeHash(buffer, 0, buffer.Length);
        }
        public byte[] ComputeHash(byte[] buffer, int offset, int count)
        {
            Initialize();
            HashCore(buffer, offset, count);
            HashValue = HashFinal();
            return (byte[])HashValue.Clone();
        }

        public byte[] ComputeHash(Stream inputStream)
        {
            Initialize();
            int count;
            byte[] buffer = new byte[4096];
            while (0 < (count = inputStream.Read(buffer, 0, 4096)))
            {
                HashCore(buffer, 0, count);
            }
            HashValue = HashFinal();
            return (byte[])HashValue.Clone();
        }

        public int TransformBlock(
            byte[] inputBuffer,
            int inputOffset,
            int inputCount,
            byte[] outputBuffer,
            int outputOffset
            )
        {
            if (inputBuffer == null)
            {
                throw new ArgumentNullException("inputBuffer");
            }
            if (inputOffset < 0)
            {
                throw new ArgumentOutOfRangeException("inputOffset");
            }
            if ((inputCount < 0) || (inputCount > inputBuffer.Length))
            {
                throw new ArgumentException("inputCount");
            }
            if ((inputBuffer.Length - inputCount) < inputOffset)
            {
                throw new ArgumentOutOfRangeException("inputOffset");
            }
            if (this.State == 0)
            {
                Initialize();
                this.State = 1;
            }

            HashCore(inputBuffer, inputOffset, inputCount);
            if ((inputBuffer != outputBuffer) || (inputOffset != outputOffset))
            {
                Buffer.BlockCopy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount);
            }
            return inputCount;
        }
        public byte[] TransformFinalBlock(
            byte[] inputBuffer,
            int inputOffset,
            int inputCount
            )
        {
            if (inputBuffer == null)
            {
                throw new ArgumentNullException("inputBuffer");
            }
            if (inputOffset < 0)
            {
                throw new ArgumentOutOfRangeException("inputOffset");
            }
            if ((inputCount < 0) || (inputCount > inputBuffer.Length))
            {
                throw new ArgumentException("inputCount");
            }
            if ((inputBuffer.Length - inputCount) < inputOffset)
            {
                throw new ArgumentOutOfRangeException("inputOffset");
            }
            if (this.State == 0)
            {
                Initialize();
            }
            HashCore(inputBuffer, inputOffset, inputCount);
            HashValue = HashFinal();
            byte[] buffer = new byte[inputCount];
            Buffer.BlockCopy(inputBuffer, inputOffset, buffer, 0, inputCount);
            this.State = 0;
            return buffer;
        }
        #endregion

        protected virtual void Dispose(bool disposing)
        {
            if (!disposing)
                Initialize();
        }
        public void Dispose()
        {
            Dispose(true);
        }
    }
}

A mes souhaits, n'est-ce pas?

Par la suite, pour l'utiliser au sein d'une page, vous procéderez ainsi:

string api_Sig = "Hello world! My name is WP_App and you have no idea of what I'm saying!");
String hash1 = MD5CryptoServiceProvider.GetMd5String(api_Sig);

Votre chaîne de caractères cryptée étant ainsi "hash1".
Le tour est joué ! Je suppose que cela fonctionne également pour WinRT (et pas seulement WinPRT), du moins je peux vous assurer que ce code est testé et éprouvé par mes soins sur la plateforme mobile de Microsoft.
Cette entrée a été publiée dans Windows Phone le 5 avril 2013 .
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