102 lines
3.3 KiB
Markdown
102 lines
3.3 KiB
Markdown
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# CryptDecode
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Performs the inverse transformation of the data from array, tranformed by [CryptEncode()](/en/docs/common/cryptencode).
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```
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int CryptEncode(
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ENUM_CRYPT_METHOD method, // method
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const uchar& data[], // source array
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const uchar& key[], // key
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uchar& result[] // destination array
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);
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```
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Parameters
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method
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[in] Data transformation method. Can be one of the values of [ENUM_CRYPT_METHOD](/en/docs/constants/namedconstants/otherconstants#enum_crypt_method) enumeration.
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data[]
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[in] Source array.
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key[]
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[in] Key array.
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result[]
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[out] Destination array.
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Return Value
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Amount of bytes in the destination array or 0 in case of error. To obtain information about the [error](/en/docs/constants/errorswarnings/errorcodes) call the [GetLastError()](/en/docs/check/getlasterror) function.
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Example:
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```
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input string InpKey = "ABCDEFG"; // Encryption key
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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string text="The quick brown fox jumps over the lazy dog";
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uchar src[],dst[],key[];
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//--- prepare the encryption key
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StringToCharArray(InpKey,key);
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//--- prepare the src[] source array
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StringToCharArray(text,src);
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//--- display source data
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PrintFormat("Initial data: size=%d, string='%s'",ArraySize(src),CharArrayToString(src));
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//--- encrypt the src[] array using the DES method with the key[] 56-bit key
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int res=CryptEncode(CRYPT_DES,src,key,dst);
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//--- check the encryption result
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if(res>0)
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{
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//--- display encrypted data
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PrintFormat("Encoded data: size=%d %s",res,ArrayToHex(dst));
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//--- decrypt the dst[] array data using the DES method with the key[] 56-bit key
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res=CryptDecode(CRYPT_DES,dst,key,src);
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//--- check the result
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if(res>0)
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{
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//--- display decrypted data
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PrintFormat("Decoded data: size=%d, string='%s'",ArraySize(src),CharArrayToString(src));
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}
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else
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Print("CryptDecode failed. Error: ",GetLastError());
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}
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else
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Print("CryptEncode failed. Error: ",GetLastError());
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}
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//+------------------------------------------------------------------+
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//| ArrayToHex |
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//+------------------------------------------------------------------+
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string ArrayToHex(uchar &arr[],int count=-1)
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{
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string res="";
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//--- check the size
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if(count<0 || count>ArraySize(arr))
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count=ArraySize(arr);
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//--- convert to hexadecimal string
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for(int i=0; i<count; i++)
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res+=StringFormat("%.2X",arr[i]);
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return(res);
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}
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```
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See also
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[Array Functions](/en/docs/array),[ ](/en/docs/common/cryptdecode)[CryptEncode()](/en/docs/common/cryptencode)
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