Type a page name and press Enter. You'll jump to the page if it exists, or you can create it if it doesn't.
To create a page in a module other than advapi32, prefix the name with the module name and a period.
CryptGenKey (advapi32)
.
Summary
Generates a random cryptographic key and returns a handle to that key by the reference parameter phKey.
C# Signature:
[DllImport(@"Advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool CryptGenKey(
[In] IntPtr hProv,
[In] uint Algid,
[In] uint dwFlags,
[Out] out IntPtr phKey
);
VB Signature:
<DLLImport("advapi32.dll", CharSet := CharSet.Auto, SetLastError := True)>
Public Shared Function CryptGenKey(ByVal hProv As IntPtr, ByVal Algid As UInteger, ByVal dwFlags As UInteger, ByRef phKey As IntPtr) As Boolean
End Function
User-Defined Types:
None.
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
be carfeul with the third parameter (dwFlags). It has different meanings depending on the object your are generating. Have a look at the MSDN.
Tips & Tricks:
Those C# enums can be used in conjonction with the function. They are defined in the header WinCrypt.h .
Note that the second parameter of the function (Algid) expects a CryptAlg value.
/// <summary>
/// Source: WinCrypt.h
/// </summary>
public enum CryptAlgClass : uint
{
ALG_CLASS_ANY = (0),
ALG_CLASS_SIGNATURE = (1 << 13),
ALG_CLASS_MSG_ENCRYPT = (2 << 13),
ALG_CLASS_DATA_ENCRYPT = (3 << 13),
ALG_CLASS_HASH = (4 << 13),
ALG_CLASS_KEY_EXCHANGE = (5 << 13),
ALG_CLASS_ALL = (7 << 13)
}
/// <summary>
/// Source: WinCrypt.h
/// </summary>
public enum CryptAlgType : uint
{
ALG_TYPE_ANY = (0),
ALG_TYPE_DSS = (1 << 9),
ALG_TYPE_RSA = (2 << 9),
ALG_TYPE_BLOCK = (3 << 9),
ALG_TYPE_STREAM = (4 << 9),
ALG_TYPE_DH = (5 << 9),
ALG_TYPE_SECURECHANNEL = (6 << 9)
}
/// <summary>
/// Source: WinCrypt.h
/// </summary>
public enum CryptAlgSID : uint
{
ALG_SID_ANY = (0),
ALG_SID_RSA_ANY = 0,
ALG_SID_RSA_PKCS = 1,
ALG_SID_RSA_MSATWORK = 2,
ALG_SID_RSA_ENTRUST = 3,
ALG_SID_RSA_PGP = 4,
ALG_SID_DSS_ANY = 0,
ALG_SID_DSS_PKCS = 1,
ALG_SID_DSS_DMS = 2,
ALG_SID_ECDSA = 3,
ALG_SID_DES = 1,
ALG_SID_3DES = 3,
ALG_SID_DESX = 4,
ALG_SID_IDEA = 5,
ALG_SID_CAST = 6,
ALG_SID_SAFERSK64 = 7,
ALG_SID_SAFERSK128 = 8,
ALG_SID_3DES_112 = 9,
ALG_SID_CYLINK_MEK = 12,
ALG_SID_RC5 = 13,
ALG_SID_AES_128 = 14,
ALG_SID_AES_192 = 15,
ALG_SID_AES_256 = 16,
ALG_SID_AES = 17,
ALG_SID_SKIPJACK = 10,
ALG_SID_TEK = 11,
ALG_SID_RC2 = 2,
ALG_SID_RC4 = 1,
ALG_SID_SEAL = 2,
ALG_SID_DH_SANDF = 1,
ALG_SID_DH_EPHEM = 2,
ALG_SID_AGREED_KEY_ANY = 3,
ALG_SID_KEA = 4,
ALG_SID_ECDH = 5,
ALG_SID_MD2 = 1,
ALG_SID_MD4 = 2,
ALG_SID_MD5 = 3,
ALG_SID_SHA = 4,
ALG_SID_SHA1 = 4,
ALG_SID_MAC = 5,
ALG_SID_RIPEMD = 6,
ALG_SID_RIPEMD160 = 7,
ALG_SID_SSL3SHAMD5 = 8,
ALG_SID_HMAC = 9,
ALG_SID_TLS1PRF = 10,
ALG_SID_HASH_REPLACE_OWF = 11,
ALG_SID_SHA_256 = 12,
ALG_SID_SHA_384 = 13,
ALG_SID_SHA_512 = 14,
ALG_SID_SSL3_MASTER = 1,
ALG_SID_SCHANNEL_MASTER_HASH = 2,
ALG_SID_SCHANNEL_MAC_KEY = 3,
ALG_SID_PCT1_MASTER = 4,
ALG_SID_SSL2_MASTER = 5,
ALG_SID_TLS1_MASTER = 6,
ALG_SID_SCHANNEL_ENC_KEY = 7,
ALG_SID_ECMQV = 1
}
/// <summary>
/// Source: WinCrypt.h
/// </summary>
public enum CryptAlg : uint
{
CALG_MD2 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_MD2),
CALG_MD4 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_MD4),
CALG_MD5 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_MD5),
CALG_SHA = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_SHA),
CALG_SHA1 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_SHA1),
CALG_MAC = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_MAC),
CALG_RSA_SIGN = (CryptAlgClass.ALG_CLASS_SIGNATURE | CryptAlgType.ALG_TYPE_RSA | CryptAlgSID.ALG_SID_RSA_ANY),
CALG_DSS_SIGN = (CryptAlgClass.ALG_CLASS_SIGNATURE | CryptAlgType.ALG_TYPE_DSS | CryptAlgSID.ALG_SID_DSS_ANY),
CALG_NO_SIGN = (CryptAlgClass.ALG_CLASS_SIGNATURE | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_ANY),
CALG_RSA_KEYX = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_RSA | CryptAlgSID.ALG_SID_RSA_ANY),
CALG_DES = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_DES),
CALG_3DES_112 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_3DES_112),
CALG_3DES = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_3DES),
CALG_DESX = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_DESX),
CALG_RC2 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_RC2),
CALG_RC4 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_STREAM | CryptAlgSID.ALG_SID_RC4),
CALG_SEAL = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_STREAM | CryptAlgSID.ALG_SID_SEAL),
CALG_DH_SF = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_DH | CryptAlgSID.ALG_SID_DH_SANDF),
CALG_DH_EPHEM = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_DH | CryptAlgSID.ALG_SID_DH_EPHEM),
CALG_AGREEDKEY_ANY = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_DH | CryptAlgSID.ALG_SID_AGREED_KEY_ANY),
CALG_KEA_KEYX = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_DH | CryptAlgSID.ALG_SID_KEA),
CALG_HUGHES_MD5 = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_MD5),
CALG_SKIPJACK = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_SKIPJACK),
CALG_TEK = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_TEK),
CALG_CYLINK_MEK = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_CYLINK_MEK),
CALG_SSL3_SHAMD5 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_SSL3SHAMD5),
CALG_SSL3_MASTER = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_SSL3_MASTER),
CALG_SCHANNEL_MASTER_HASH = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_SCHANNEL_MASTER_HASH),
CALG_SCHANNEL_MAC_KEY = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_SCHANNEL_MAC_KEY),
CALG_SCHANNEL_ENC_KEY = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_SCHANNEL_ENC_KEY),
CALG_PCT1_MASTER = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_PCT1_MASTER),
CALG_SSL2_MASTER = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_SSL2_MASTER),
CALG_TLS1_MASTER = (CryptAlgClass.ALG_CLASS_MSG_ENCRYPT | CryptAlgType.ALG_TYPE_SECURECHANNEL | CryptAlgSID.ALG_SID_TLS1_MASTER),
CALG_RC5 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_RC5),
CALG_HMAC = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_HMAC),
CALG_TLS1PRF = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_TLS1PRF),
CALG_HASH_REPLACE_OWF = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_HASH_REPLACE_OWF),
CALG_AES_128 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_AES_128),
CALG_AES_192 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_AES_192),
CALG_AES_256 = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_AES_256),
CALG_AES = (CryptAlgClass.ALG_CLASS_DATA_ENCRYPT | CryptAlgType.ALG_TYPE_BLOCK | CryptAlgSID.ALG_SID_AES),
CALG_SHA_256 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_SHA_256),
CALG_SHA_384 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_SHA_384),
CALG_SHA_512 = (CryptAlgClass.ALG_CLASS_HASH | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_SHA_512),
CALG_ECDH = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_DH | CryptAlgSID.ALG_SID_ECDH),
CALG_ECMQV = (CryptAlgClass.ALG_CLASS_KEY_EXCHANGE | CryptAlgType.ALG_TYPE_ANY | CryptAlgSID.ALG_SID_ECMQV),
CALG_ECDSA = (CryptAlgClass.ALG_CLASS_SIGNATURE | CryptAlgType.ALG_TYPE_DSS | CryptAlgSID.ALG_SID_ECDSA)
}
Sample Code:
Create a 2048 bits RSA Signing key pair:
/// NOTE: hProv is a valid context handle see: CryptAquireContext
uint keySize = 2048;
IntPtr hKey = IntPtr.Zero;
/// Put the key size in the upper 16 bits
uint dwFlags = keySize << 16;
/// NOTE: Some additional flags can be set in dwFlags. Just OR them :
/// dwFlags |= someFlag;
CryptGenKey(hProv, (uint)CryptAlg.CALG_RSA_SIGN, dwFlags, out hKey);
Documentation
Please edit this page!
Do you have...
helpful tips or sample code to share for using this API in managed code?
corrections to the existing content?
variations of the signature you want to share?
additional languages you want to include?
Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).