- Dh Public Key Generation C Code List
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- Dh Public Key Generation C Code List
- Dh Public Key Generation C Codes
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183. @paramin context Pointer to the Diffie-Hellman context 184. @paramout output Buffer where to store the shared secret 185. @paramin outputSize Size of the buffer in bytes. A DH public key is bigger to encode than a RSA public key, if the DH key includes the DH parameters; it is smaller otherwise. In the case of SSL, using DHERSA instead of RSA means exchanging one or two extra kilobytes of data - there again, only once per client (because of SSL session reuse), so. Nov 04, 2014 Get YouTube without the ads. 1 month free. Find out why Close. The RSA Encryption Algorithm (2 of 2: Generating the Keys). Understanding ECC through the Diffie-Hellman.
Source repository
If you want to dive directly into the source, look below or go to our mbed TLS GitHub
Browsing the library source
Each cipher and hashing algorithm in mbed TLS (AES, MD5, SHA-1, etc.) is self-contained and can be easily reused as a standalone module.
Block and stream ciphers
- AES-GCM source code ( gcm.hgcm.c )
- ARC4 source code ( arc4.harc4.c )
- XTEA source code ( xtea.hxtea.c )
Public-key cryptography
- MPI (Bignum) source code ( bignum.hbignum.c )
- Diffie-Hellman source code ( dhm.hdhm.c )
- Elliptic Curve code ( ecp.hecp.c )
- Elliptic Curve Diffie-Hellman ( ecdh.hecdh.c )
- Elliptic Curve DSA (ECDSA) ( ecdsa.hecdsa.c )
- Public Key Parsing source code ( pk.hpkparse.c )
![Dh public key generation c code list Dh public key generation c code list](/uploads/1/2/6/0/126011842/813914473.png)
Random number generators
- HAVEGE source code ( havege.hentropy.c )
Abstraction layers
- Cipher layer source code ( cipher.hcipher.c )
- Message Digest layer source code ( md.hmd.c )
- Public Key layer source code ( pk.hpk.c )
- Threading layer source code ( threading.hthreading.c )
- Memory layer source code ( memory.hmemory.c )
Hash functions
- MD2 source code ( md2.hmd2.c )
- MD4 source code ( md4.hmd4.c )
Cryptographic protocols
- X.509 CRL parsing source code ( x509_crl.hx509_crl.c )
- X.509 Certificate parsing code ( x509_crt.hx509_crt.c )
- X.509 Certificate Request parsing ( x509_csr.hx509_csr.c )
- SSL/TLS common source code ( ssl.hssl_tls.c )
- SSL/TLS client source code ( ssl.hssl_cli.c )
- SSL/TLS server source code ( ssl.hssl_srv.c )
- SSL Session Cache source ( ssl_cache.hssl_cache.c )
Miscellaneous
- ASN.1 parsing source code ( asn1.hasn1parse.c )
- Debugging functions ( debug.hdebug.c )
- Error message source code ( error.herror.c )
- Networking functions ( net.hnet.c )
- OID database source code ( oid.hoid.c )
- PadLock source code ( padlock.hpadlock.c )
- Timing source code ( timing.htiming.c )
CA Functionality
- ASN.1 writing source code ( asn1write.hasn1write.c )
- Public Key writing source code ( pk.hpkwrite.c )
- X.509 Certificate writing code ( x509_crt.hx509_crt.c )
- X.509 Certificate Request writing ( x509_csr.hx509_csr.c )
Browsing the example source
mbed TLS also comes with a set of example programs to show basic ways to use the library and perform standard operations and functionalities. These examples may help you get started with using mbed TLS:
Block and stream ciphers
- AES-256 file encryption ( aescrypt2.c )
- Generic cipher layer example ( crypt_and_hash.c )
Public-key cryptography
- Key generation application ( gen_key.c )
- RSA key reader / viewer ( key_app.c )
- RSA key value printing ( key_app_writer.c )
- Decrypt via PK layer demonstration ( pk_decrypt.c )
- Encrypt via PK layer demonstration ( pk_encrypt.c )
- Sign via PK layer demonstration ( pk_sign.c )
- Verify via PK layer demonstration ( pk_verify.c )
- MPI demonstration ( mpi_demo.c )
- RSA key generation ( rsa_genkey.c )
- RSA signature creation ( rsa_sign.c )
- RSA signature verification ( rsa_verify.c )
- RSASSA-PSS signature creation ( rsa_sign_pss.c )
- RSASSA-PSS signature verify ( rsa_verify_pss.c )
- RSA simple data encryption ( rsa_encrypt.c )
- RSA simple data decryption ( rsa_decrypt.c )
- Diffie-Hellman prime generation ( dh_genprime.c )
- RSA/Diffie-Hellman client ( dh_client.c )
- RSA/Diffie-Hellman server ( dh_server.c )
Random generation
- Generate entropy file ( gen_entropy.c )
- Generate with CTR_DRBG ( gen_random_ctr_drbg.c )
- Generate with HAVEGE ( gen_random_havege.c )
Utility
- Errorcode to string conversion ( strerror.c )
- PEM to DER conversion utility ( pem2der.c )
Hash functions
- Generic digest layer example ( generic_sum.c )
- MD5 of 'Hello, world' ( hello.c )
Cryptographic protocols
- Simple SSL/TLS client ( ssl_client1.c )
- Advanced SSL/TLS client ( ssl_client2.c )
- SSL/TLS forked server program ( ssl_fork_server.c )
- SMTP client (STARTTLS and TLS) ( ssl_mail_client.c )
- SSL/TLS server program ( ssl_server.c )
- Advanced SSL/TLS server program ( ssl_server2.c )
X.509
Dh Public Key Generation C Code List
- X.509 Certificate printing (file/server) ( cert_app.c )
- X.509 CRL printing (file) ( crl_app.c )
- X.509 Certificate Request (CSR) printing (file) ( req_app.c )
- X.509 Certificate Request writing ( cert_req.c )
- X.509 Certificate creation / writing ( cert_write.c )
Miscellaneous
- Crypto benchmark ( benchmark.c )
- Self-test program ( selftest.c )
Definition
Provides a Cryptography Next Generation (CNG) implementation of the Elliptic Curve Diffie-Hellman (ECDH) algorithm. This class is used to perform cryptographic operations.
Free Key Generation Software
ECDiffieHellmanCng
Examples
The following example shows how to use the ECDiffieHellmanCng class to establish a key exchange and how to use that key to encrypt a message that can be sent over a public channel and decrypted by the receiver.
Remarks
The ECDiffieHellmanCng class enables two parties to exchange private key material even if they are communicating through a public channel. Both parties can calculate the same secret value, which is referred to as the secret agreement in the managed Diffie-Hellman classes. The secret agreement can then be used for a variety of purposes, including as a symmetric key. However, instead of exposing the secret agreement directly, the ECDiffieHellmanCng class does some post-processing on the agreement before providing the value. This post processing is referred to as the key derivation function (KDF); you can select which KDF you want to use and set its parameters through a set of properties on the instance of the Diffie-Hellman object.
Key Generator
Key derivation function | Properties |
---|---|
Hash | HashAlgorithm - The hash algorithm that is used to process the secret agreement. SecretPrepend - An optional byte array to prepend to the secret agreement before hashing it. SecretAppend - An optional byte array to append to the secret agreement before hashing it. |
Hmac | HashAlgorithm - The hash algorithm that is used to process the secret agreement. SecretPrepend- An optional byte array to prepend to the secret agreement before hashing it. SecretAppend - An optional byte array to append to the secret agreement before hashing it. |
Tls | Label - The label for key derivation. Seed - The seed for key derivation. |
Dh Public Key Generation C Code List
The result of passing the secret agreement through the key derivation function is a byte array that may be used as key material for your application. The number of bytes of key material generated is dependent on the key derivation function; for example, SHA-256 will generate 256 bits of key material, whereas SHA-512 will generate 512 bits of key material.The basic flow of an ECDH key exchange is as follows:
Dh Public Key Generation C Codes
- Alice and Bob create a key pair to use for the Diffie-Hellman key exchange operation
- Alice and Bob configure the KDF using parameters the agree on.
- Alice sends Bob her public key.
- Bob sends Alice his public key.
- Alice and Bob use each other's public keys to generate the secret agreement, and apply the KDF to the secret agreement to generate key material.
Constructors
ECDiffieHellmanCng() | Initializes a new instance of the ECDiffieHellmanCng class with a random key pair. |
ECDiffieHellmanCng(CngKey) | Initializes a new instance of the ECDiffieHellmanCng class by using the specified CngKey object. |
ECDiffieHellmanCng(ECCurve) | Creates a new instance of the ECDiffieHellmanCng class whose public/private key pair is generated over the specified curve. |
ECDiffieHellmanCng(Int32) | Initializes a new instance of the ECDiffieHellmanCng class with a random key pair, using the specified key size. |
Fields
Dh Public Key Generation C Code Download
KeySizeValue | Represents the size, in bits, of the key modulus used by the asymmetric algorithm. (Inherited from AsymmetricAlgorithm) |
LegalKeySizesValue | Specifies the key sizes that are supported by the asymmetric algorithm. (Inherited from AsymmetricAlgorithm) |
Properties
HashAlgorithm | Gets or sets the hash algorithm to use when generating key material. |
HmacKey | Gets or sets the Hash-based Message Authentication Code (HMAC) key to use when deriving key material. |
Key | Specifies the CngKey that is used by the current object for cryptographic operations. |
KeyDerivationFunction | Gets or sets the key derivation function for the ECDiffieHellmanCng class. |
KeyExchangeAlgorithm | Gets the name of the key exchange algorithm. (Inherited from ECDiffieHellman) |
KeySize | Gets or sets the size, in bits, of the key modulus used by the asymmetric algorithm. |
Label | Gets or sets the label value that is used for key derivation. |
LegalKeySizes | Gets the key sizes that are supported by the asymmetric algorithm. (Inherited from AsymmetricAlgorithm) |
PublicKey | Gets the public key that can be used by another ECDiffieHellmanCng object to generate a shared secret agreement. |
SecretAppend | Gets or sets a value that will be appended to the secret agreement when generating key material. |
SecretPrepend | Gets or sets a value that will be added to the beginning of the secret agreement when deriving key material. |
Seed | Gets or sets the seed value that will be used when deriving key material. |
SignatureAlgorithm | Gets the name of the signature algorithm. (Inherited from ECDiffieHellman) |
UseSecretAgreementAsHmacKey | Gets a value that indicates whether the secret agreement is used as a Hash-based Message Authentication Code (HMAC) key to derive key material. |
Methods
Clear() | Releases all resources used by the AsymmetricAlgorithm class. (Inherited from AsymmetricAlgorithm) |
DeriveKeyFromHash(ECDiffieHellmanPublicKey, HashAlgorithmName) | Performs key derivation using a specified hash algorithm. (Inherited from ECDiffieHellman) |
DeriveKeyFromHash(ECDiffieHellmanPublicKey, HashAlgorithmName, Byte[], Byte[]) | Performs key derivation using a specified hash algorithm with optional prepended or appended data. |
DeriveKeyFromHmac(ECDiffieHellmanPublicKey, HashAlgorithmName, Byte[]) | Performs key derivation using a specified HMAC (Hash-based Message Authentication Code) algorithm. (Inherited from ECDiffieHellman) |
DeriveKeyFromHmac(ECDiffieHellmanPublicKey, HashAlgorithmName, Byte[], Byte[], Byte[]) | Performs key derivation using a specified HMAC (Hash-based Message Authentication Code) algorithm with optional prepended or appended data. |
DeriveKeyMaterial(CngKey) | Derives the key material that is generated from the secret agreement between two parties, given a CngKey object that contains the second party's public key. |
DeriveKeyMaterial(ECDiffieHellmanPublicKey) | Derives the key material that is generated from the secret agreement between two parties, given an ECDiffieHellmanPublicKey object that contains the second party's public key. |
DeriveKeyTls(ECDiffieHellmanPublicKey, Byte[], Byte[]) | Performs key derivation using the TLS (Transport Layer Security) 1.1 PRF (Pseudo-Random Function). |
DeriveSecretAgreementHandle(CngKey) | Gets a handle to the secret agreement generated between two parties, given a CngKey object that contains the second party's public key. |
DeriveSecretAgreementHandle(ECDiffieHellmanPublicKey) | Gets a handle to the secret agreement generated between two parties, given an ECDiffieHellmanPublicKey object that contains the second party's public key. |
Dispose() | Releases all resources used by the current instance of the AsymmetricAlgorithm class. (Inherited from AsymmetricAlgorithm) |
Dispose(Boolean) | Releases the unmanaged resources used by the AsymmetricAlgorithm class and optionally releases the managed resources. (Inherited from AsymmetricAlgorithm) |
Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object) |
ExportECPrivateKey() | Exports the current key in the ECPrivateKey format. (Inherited from ECDiffieHellman) |
ExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Byte>, PbeParameters) | Exports the current key in the PKCS#8 EncryptedPrivateKeyInfo format with a byte-based password. (Inherited from AsymmetricAlgorithm) |
ExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Char>, PbeParameters) | Exports the current key in the PKCS#8 EncryptedPrivateKeyInfo format with a char-based password. (Inherited from AsymmetricAlgorithm) |
ExportExplicitParameters(Boolean) | Exports the key and explicit curve parameters used by the ECCurve object into an ECParameters object. |
ExportParameters(Boolean) | Exports the key used by the ECCurve object into an ECParameters object. |
ExportPkcs8PrivateKey() | Exports the current key in the PKCS#8 PrivateKeyInfo format. (Inherited from AsymmetricAlgorithm) |
ExportSubjectPublicKeyInfo() | Exports the public-key portion of the current key in the X.509 SubjectPublicKeyInfo format. (Inherited from AsymmetricAlgorithm) |
FromXmlString(String) | This method is not implemented. |
FromXmlString(String, ECKeyXmlFormat) | Deserializes the key information from an XML string by using the specified format. |
GenerateKey(ECCurve) | Generates a new ephemeral public/private key pair for the specified curve. |
GetHashCode() | Serves as the default hash function. (Inherited from Object) |
GetType() | Gets the Type of the current instance. (Inherited from Object) |
ImportECPrivateKey(ReadOnlySpan<Byte>, Int32) | Imports the public/private keypair from an ECPrivateKey structure, replacing the keys for this object. (Inherited from ECDiffieHellman) |
ImportEncryptedPkcs8PrivateKey(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Int32) | Imports the public/private keypair from a PKCS#8 EncryptedPrivateKeyInfo structure after decrypting with a byte-based password, replacing the keys for this object. (Inherited from ECDiffieHellman) |
ImportEncryptedPkcs8PrivateKey(ReadOnlySpan<Char>, ReadOnlySpan<Byte>, Int32) | Imports the public/private keypair from a PKCS#8 EncryptedPrivateKeyInfo structure after decrypting with a char-based password, replacing the keys for this object. (Inherited from ECDiffieHellman) |
ImportParameters(ECParameters) | Imports the specified parameters for an ECCurve object as a key into the current instance. |
ImportPkcs8PrivateKey(ReadOnlySpan<Byte>, Int32) | Imports the public/private keypair from a PKCS#8 PrivateKeyInfo structure after decryption, replacing the keys for this object. (Inherited from ECDiffieHellman) |
ImportSubjectPublicKeyInfo(ReadOnlySpan<Byte>, Int32) | Imports the public key from an X.509 SubjectPublicKeyInfo structure after decryption, replacing the keys for this object. (Inherited from ECDiffieHellman) |
MemberwiseClone() | Creates a shallow copy of the current Object. (Inherited from Object) |
ToString() | Returns a string that represents the current object. (Inherited from Object) |
ToXmlString(Boolean) | This method is not implemented. |
ToXmlString(ECKeyXmlFormat) | Serializes the key information to an XML string by using the specified format. |
TryExportECPrivateKey(Span<Byte>, Int32) | Attempts to export the current key in the ECPrivateKey format into a provided buffer. (Inherited from ECDiffieHellman) |
TryExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Byte>, PbeParameters, Span<Byte>, Int32) | Attempts to export the current key in the PKCS#8 EncryptedPrivateKeyInfo format into a provided buffer, using a byte-based password. (Inherited from ECDiffieHellman) |
TryExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Char>, PbeParameters, Span<Byte>, Int32) | Attempts to export the current key in the PKCS#8 EncryptedPrivateKeyInfo format into a provided buffer, using a char-based password. (Inherited from ECDiffieHellman) |
TryExportPkcs8PrivateKey(Span<Byte>, Int32) | Attempts to export the current key in the PKCS#8 PrivateKeyInfo format into a provided buffer. (Inherited from ECDiffieHellman) |
TryExportSubjectPublicKeyInfo(Span<Byte>, Int32) | Attempts to export the current key in the X.509 SubjectPublicKeyInfo format into a provided buffer. (Inherited from ECDiffieHellman) |
Explicit Interface Implementations
IDisposable.Dispose() | For a description of this member, see Dispose(). (Inherited from AsymmetricAlgorithm) |