How To Create A Pfx File For Digital Signature: Software

That was really helpful, thanks, however, when Im inserting the signature, my issue is that the users dont have an existing digital signature. Laboratory Catalog. Software Service Balances UVVIS Spectroscopy Titration Density Meters Refractometers pH Meters Electrodes Thermal Values Materials. C How to fix Invalid algorithm specified when signing with SHA2. Hint. DeskA digital signature or digital signature scheme is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, and that it was not altered in transit. Digital signatures are commonly used for software distribution, financial transactions, and in other cases where it is important to detect forgery or tampering From Wikipedia. If you are now working in information security fields, you should be familiar with this concept. Since version. Net Framework 3. SP1, Microsoft has supported for signing and verifing digital signature with SHA2. However maybe youll get an error Invalid algorithm specified if trying to sign data with SHA2. To reproduce the error, I would like to make a demo of code for signing with SHA2. Mainstring args. X5. Store store. My. Current. User new X5. StoreStore. Name. My, Store. Location. Current. User. store. My. Current. User. OpenOpen. Flags. Max. Allowed. X5. Certificate. RCA new X5. 09. Certificate. C Open. SSL Win. 64binRCA. My. Current. User. Certificates. Containscert. RCA. store. My. Current. User. Addcert. RCA. RSACrypto. Service. Provider provider null. RCA. Has. Private. Key. provider RSACrypto. Service. Providercert. RCA. Private. Key. Bytes provider. Sign. Datadata, SHA2. My. Current. User. Close. Console. Write. LineFinished. Exception ex. Console. Write. Lineex. Message. Console. Read. Line. The Invalid algorithm specified can occur at line. Bytes provider. Sign. Datadata, SHA2. The reason is that RSACrypto. Service. Provider relies on the underlying Crypto. API to do its work. This feature will only be enabled on versions of Windows which support SHA2. Cryto. API. That mean it depends on the CSP Cryptographic Service Provider that we use to perform the cryptographic operations. When we call Sign. Data with SHA2. 56, because the Microsoft CSPs are implemented on Rsaenh. Crypt. Create. Hash will be called behind the scenes with ALGID of CALGSHA2. This crypto API doesnt perform crypto operations by itself. It redirects the parameters which it gets from application to the desired CSP, and the CSP performs the operations on its behalf. So the error we are getting is actually coming from the CSP. Therefore to check if we can use SHA2. Your certificate must be generated with support for SHA2. Your CSP which you use to generate your certificate must support SHA2. If you want to understand more about certificate and PKI system, there is an expensive book which covers a lof of security problems on Windows Server Windows Server 2. PKI and Certificate Security PRO Other1. How to check if my certificate was generated with SHA2. Icbc Logo. For applying a certificate which is valid over internet, we should create a Certificate Request and then send this request to a root CA Certificate Authority like Verisign to generate a valid certificate for us. On the root CA, hell create himself a pair key cert to validate all other certificates like this. CVNSTSGLSai. GonOSuper. VerisignOURoot. CACNSuper. Verisign. Root. CA nodes x. Root. CA. key out Root. CA. cert. On our sides, to apply for a new certificate, we create a pair key request and then send certificate request file. CA. openssl req newkey rsa 1. CDESTBYLMunichORongchauaOUHomeCNRongchaua. Home nodes sha. RCA. RCA. When a root CA receives our Certificate Request, hell generate a cert with a validity of one year or many years and many other options according to our request which you can see at the documentation of Open. SSL. openssl x. 50. CAcreateserial in RCA. CA Root. CA. cert CAkey Root. CA. key out RCA. In the command of Open. SSL above you can see that our cert was generated with sha. If root CA does not support this option, we cannot use SHA2. To check if your certificate supports SHA2. RCA. cert text noout. The content of cert file looks something like this. Its important that Signature Algorithm sha. With. RSAEncryption. Version 1 0x. 0. Serial Number. Signature Algorithm sha. With. RSAEncryption. Issuer CVN, STSG, LSai. Gon, OSuper. Verisign, OURoot. CA, CNSuper. Verisign. Root. CA. Validity. Not Before Jul 2. GMT. Not After Jul 2. GMT. Subject CDE, STBY, LMunich, ORongchaua, OUHome, CNRongchaua. Home. Subject Public Key Info. Public Key Algorithm rsa. Encryption. Public Key 1. Modulus. 0. 0 dd 9. Exponent 6. 55. 37 0x. Signature Algorithm sha. With. RSAEncryption. How do I know that CSP of my certificate supports SHA2. After you receive the cert file from root CA, maybe you would like to integrate your private key into your cert to signverify data. If you are using 3rd party CSP to signverify your data, I recommend you to contact the provider directly and ask if they support SHA2. For the other who uses Microsoft CSP, to check if your Windows computer supports Microsoft CSP with SHA2. Command Prompt, enter napclcfg. NAP Client Configuration. Browse on the left Tree. View to Health Registration Settings Request Policy, then click on Cryptographic Service Provider to list all supported Microsoft Cryptographic Service Providers. These entries are stored in registry under HKLMSoftwareMicrosoftCryptographyDefaultsProvider as image below There is another registry key at the same level of this key is Provider Types. Click on all these types youll see the name of the provider and his supported Protocol. For example, Type 0. Microsoft Strong Cryptographic Provider RSA Full Signature and Key Exchange. Because we want to use SHA2. Type 0. 24 Microsoft Enhanced RSA and AES Cryptographic Provider RSA Full and AES. Now we can integrate our private keys with our certificate and indicate explicitly that we would like to use Microsoft Enhanced RSA and AES Cryptographic Provider as our CSP. RCA. cert inkey RCA. CSP Microsoft Enhanced RSA and AES Cryptographic Provider out RCA. To check if the CSP is correct, we can take a look at the. RCA. p. 12. local. Key. ID 2. C 9. 5 1. EB B4 9. 6 1. 4 8. E CC FE EE 3. D 5. F 4. A 0. 7 4. 2 2. BA 2. C. subjectCDESTBYLMunichORongchauaOUHomeCNRongchaua. Home. issuerCVNSTSGLSai. GonOSuper. VerisignOURoot. CACNSuper. Verisign. Root. CA. BEGIN CERTIFICATE. MIICTz. CCAbg. CCQDU1u. CCc. OQy. 6DANBgkqhki. G9w. 0BAQs. FADBy. MQsw. CQYDVQQGEw. JW. Tj. ELMAk. GA1. UECAw. CU0cx. 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