- Session Php Servicegroupid
- Php Generate Random Session Key In Java
- Php Generate Random Session Key In Windows 10
Apr 13, 2016 Generating Sessions Ids. Umer Mansoor Follow Apr 13, 2016 6 mins read. Random session Ids. The server then uses the username, the IP address and secret key to re-generate the session Id and see if it matches with the session Id passed by the client. Apr 25, 2019 Create read function. This function will be called by PHP when we try to access a session for example when we use echo $SESSION'something'. Because there might be many calls to this function on a single page, we take advantage of prepared statements, not only for security but for performance also. Oct 04, 2018 The server generates a unique random number, which is called a session id. It also creates a new file on the server which is used to store the session-specific information. Next, a session id is passed back to the user, along with whatever resource was requested.
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CryptGenKey function generates a random cryptographic session key or a public/private key pair. A handle to the key or key pair is returned in phKey. This handle can then be used as needed with any CryptoAPI function that requires a key handle.The calling application must specify the algorithm when calling this function. Because this algorithm type is kept bundled with the key, the application does not need to specify the algorithm later when the actual cryptographic operations are performed.
Syntax
Parameters
hProv
A handle to a cryptographic service provider (CSP) created by a call toCryptAcquireContext.
Algid
AnALG_ID value that identifies the algorithm for which the key is to be generated. Values for this parameter vary depending on the CSP used.
For ALG_ID values to use with the Microsoft Base Cryptographic Provider, seeBase Provider Algorithms.
For ALG_ID values to use with the Microsoft Strong Cryptographic Provider or the Microsoft Enhanced Cryptographic Provider, seeEnhanced Provider Algorithms.
For a Diffie-Hellman CSP, use one of the following values.
| Value | Meaning |
|---|---|
| Specifies an 'Ephemeral' Diffie-Hellman key. |
| Specifies a 'Store and Forward' Diffie-Hellman key. |
In addition to generating session keys for symmetric algorithms, this function can also generate public/private key pairs. Each CryptoAPI client generally possesses two public/private key pairs. To generate one of these key pairs, set the Algid parameter to one of the following values.
| Value | Meaning |
|---|---|
| Key exchange |
| Digital signature |
dwFlags
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Specifies the type of key generated. The sizes of a session key, RSA signature key, and RSA key exchange keys can be set when the key is generated. The key size, representing the length of the key modulus in bits, is set with the upper 16 bits of this parameter. Thus, if a 2,048-bit RSA signature key is to be generated, the value 0x08000000 is combined with any other dwFlags predefined value with a bitwise-OR operation. The upper 16 bits of 0x08000000 is 0x0800, or decimal 2,048. The RSA1024BIT_KEY value can be used to specify a 1024-bit RSA key.
Due to changing export control restrictions, the default CSP and default key length may change between operating system versions. It is important that both the encryption and decryption use the same CSP and that the key length be explicitly set using the dwFlags parameter to ensure interoperability on different operating system platforms.
In particular, the default RSA Full Cryptographic Service Provider is the Microsoft RSA Strong Cryptographic Provider. The default DSS Signature Diffie-Hellman Cryptographic Service Provider is the Microsoft Enhanced DSS Diffie-Hellman Cryptographic Provider. Each of these CSPs has a default 128-bit symmetric key length for RC2 and RC4 and a 1,024-bit default key length for public key algorithms.
If the upper 16 bits is zero, the default key size is generated. If a key larger than the maximum or smaller than the minimum is specified, the call fails with the ERROR_INVALID_PARAMETER code.
The following table lists minimum, default, and maximum signature and exchange key lengths beginning with Windows XP.
| Key type and provider | Minimum length | Default length | Maximum length |
|---|---|---|---|
| RSA Base Provider Signature and ExchangeKeys | 384 | 512 | 16,384 |
| RSA Strong and Enhanced Providers Signature and Exchange Keys | 384 | 1,024 | 16,384 |
| DSS Base Providers Signature Keys | 512 | 1,024 | 1,024 |
| DSS Base Providers Exchange Keys | Not applicable | Not applicable | Not applicable |
| DSS/DH Base Providers Signature Keys | 512 | 1,024 | 1,024 |
| DSS/DH Base Providers Exchange Keys | 512 | 512 | 1,024 |
| DSS/DH Enhanced Providers Signature Keys | 512 | 1,024 | 1,024 |
| DSS/DH Enhanced Providers Exchange Keys | 512 | 1,024 | 4,096 |
For session key lengths, see CryptDeriveKey.
For more information about keys generated using Microsoft providers, seeMicrosoft Cryptographic Service Providers.
The lower 16-bits of this parameter can be zero or a combination of one or more of the following values.
| Value | Meaning |
|---|---|
| If this flag is set, the key can be exported until its handle is closed by a call to CryptDestroyKey. This allows newly generated keys to be exported upon creation for archiving or key recovery. After the handle is closed, the key is no longer exportable. |
| This flag is not used. |
| If this flag is set, then the key is assigned a random salt value automatically. You can retrieve this salt value by using the CryptGetKeyParam function with the dwParam parameter set to KP_SALT. If this flag is not set, then the key is given a salt value of zero. When keys with nonzero salt values are exported (throughCryptExportKey), then the salt value must also be obtained and kept with the key BLOB. |
| This flag is not used. |
| If this flag is set, then the key can be transferred out of the CSP into a key BLOB by using the CryptExportKey function. Because session keys generally must be exportable, this flag should usually be set when they are created. If this flag is not set, then the key is not exportable. For a session key, this means that the key is available only within the current session and only the application that created it will be able to use it. For a public/private key pair, this means that the private key cannot be transported or backed up. It is an open standard that is free to use for any public, private, commercial, or non-commercial use. AES is a symmetric key encryption cipher, and it is generally regarded as the “gold standard” for encrypting data.AES is NIST-certified and is used by the US government for protecting “secure” data, which has led to a more general adoption of AES as the standard symmetric key cipher of choice by just about everyone. Generate 256 aes key android. This flag applies only to session key and private key BLOBs. It does not apply to public keys, which are always exportable. |
| This flag specifies strong key protection. When this flag is set, the user is prompted to enter a password for the key when the key is created. The user will be prompted to enter the password whenever this key is used. This flag is only used by the CSPs that are provided by Microsoft. Third party CSPs will define their own behavior for strong key protection. Specifying this flag causes the same result as calling this function with the CRYPT_USER_PROTECTED flag when strong key protection is specified in the system registry. If this flag is specified and the provider handle in the hProv parameter was created by using the CRYPT_VERIFYCONTEXT or CRYPT_SILENT flag, this function will set the last error to NTE_SILENT_CONTEXT and return zero. Windows Server 2003 and Windows XP: This flag is not supported. |
| This flag is not used. |
| This flag is not used. |
| This flag specifies that a no salt value gets allocated for a forty-bit symmetric key. For more information, see Salt Value Functionality. |
| This flag is not used. |
| This flag specifies an initial Diffie-Hellman or DSS key generation. This flag is useful only with Diffie-Hellman and DSS CSPs. When used, a default key length will be used unless a key length is specified in the upper 16 bits of the dwFlags parameter. If parameters that involve key lengths are set on a PREGEN Diffie-Hellman or DSS key using CryptSetKeyParam, the key lengths must be compatible with the key length set here. |
| This flag is not used. |
| This flag is not used. |
| This flag is not used. |
| If this flag is set, the user is notified through a dialog box or another method when certain actions are attempting to use this key. The precise behavior is specified by the CSP being used. If the provider context was opened with the CRYPT_SILENT flag set, using this flag causes a failure and the last error is set to NTE_SILENT_CONTEXT. |
| This flag is not used. |
phKey
Address to which the function copies the handle of the newly generated key. When you have finished using the key, delete the handle to the key by calling the CryptDestroyKey function.
Return value
Returns nonzero if successful or zero otherwise.
For extended error information, callGetLastError.
The error codes prefaced by 'NTE' are generated by the particular CSP being used. Some possible error codes are listed in the following table.
| Return code | Description |
|---|---|
| One of the parameters specifies a handle that is not valid. |
| One of the parameters contains a value that is not valid. This is most often a pointer that is not valid. |
| The Algid parameter specifies an algorithm that this CSP does not support. |
| The dwFlags parameter contains a value that is not valid. |
| The hProv parameter does not contain a valid context handle. |
| The function failed in some unexpected way. |
| The provider could not perform the action because the context was acquired as silent. |
Session Php Servicegroupid
Remarks
Php Generate Random Session Key In Java
If keys are generated for symmetricblock ciphers, the key, by default, is set up in cipher block chaining (CBC) mode with an initialization vector of zero. This cipher mode provides a good default method for bulk encrypting data. To change these parameters, use theCryptSetKeyParam function.
To choose an appropriate key length, the following methods are recommended:
- Enumerate the algorithms that the CSP supports and get maximum and minimum key lengths for each algorithm. To do this, call CryptGetProvParam with PP_ENUMALGS_EX.
- Use the minimum and maximum lengths to choose an appropriate key length. It is not always advisable to choose the maximum length because this can lead to performance issues.
- After the desired key length has been chosen, use the upper 16 bits of the dwFlags parameter to specify the key length.
Examples
The following example shows the creation of a random session key. For an example that includes the complete context for this example, see Example C Program: Encrypting a File. For another example that uses this function, see Example C Program: Decrypting a File.
Requirements
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | wincrypt.h |
| Library | Advapi32.lib |
| DLL | Advapi32.dll |
See also
Php Generate Random Session Key In Windows 10
A session key is a single-use symmetric key used for encrypting all messages in one communication session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or multicast key which refers to any key used for encrypting messages, contrary to other uses like encrypting other keys (key encryption key (KEK) or key wrapping key).
Asp.net mvc machine key generator download. Hope that helps. If you like, please post back here if you figure out the issue, I'm sure others have had the same problem, too. I realize this would be a last resort, though.That's all I can think of for now. It might only take a few hours (or less) if the app isn't super complicated. Scott Guthrie has some good links on his blog on migrating a 1.1 app to 2.0.
Session keys can introduce complications into a system, yet they solve some real problems. There are two primary reasons to use session keys:
- Several cryptanalytic attacks become easier the more material encrypted with a specific key is available. By limiting the amount of data processed using a particular key, those attacks are rendered harder to perform.
- asymmetric encryption is too slow for many purposes, and all secret key algorithms require that the key is securely distributed. By using an asymmetric algorithm to encrypt the secret key for another, faster, symmetric algorithm, it's possible to improve overall performance considerably. This is the process used by PGP and GPG.[1]
Like all cryptographic keys, session keys must be chosen so that they cannot be predicted by an attacker, usually requiring them to be chosen randomly. Failure to choose session keys (or any key) properly is a major (and too common in actual practice) design flaw in any crypto system.[citation needed]
See also[edit]
References[edit]
- ^OpenPGP Message Format http://tools.ietf.org/html/rfc4880