Package net.i2p.crypto
Class DSAEngine
- java.lang.Object
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- net.i2p.crypto.DSAEngine
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public final class DSAEngine extends Object
Sign and verify using DSA-SHA1 and other signature algorithms. Also contains methods to sign and verify using a SHA-256 Hash. The primary implementation is code from TheCryto. As of 0.8.7, also included is an alternate implementation using java.security libraries, which is slightly slower. This implementation could in the future be easily modified to use a new signing algorithm from java.security when we change the signing algorithm. Params and rv's changed from Hash to SHA1Hash for version 0.8.1 Hash variants of sign() and verifySignature() restored in 0.8.3, required by Syndie. As of 0.9.9, certain methods support RSA and ECDSA keys and signatures, i.e. all types specified in SigType. The type is specified by the getType() method in Signature, SigningPublicKey, and SigningPrivateKey. See Javadocs for individual methods for the supported types. Methods encountering an unsupported type will throw an IllegalArgumentException. EdDSA support added in 0.9.15
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Constructor Summary
Constructors Constructor Description DSAEngine(I2PAppContext context)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description static SHA1Hash
calculateHash(byte[] source, int offset, int len)
SHA1Hash
calculateHash(InputStream in)
Deprecated.unusedstatic DSAEngine
getInstance()
Signature
sign(byte[] data, int offset, int length, SigningPrivateKey signingKey)
Sign using any key type as of 0.9.12 (DSA-SHA1 only prior to that)Signature
sign(byte[] data, SigningPrivateKey signingKey)
Sign using any key type.Signature
sign(InputStream in, SigningPrivateKey signingKey)
Sign using DSA-SHA1 ONLY.Signature
sign(SHA1Hash hash, SigningPrivateKey signingKey)
Sign using DSA-SHA1 ONLY.Signature
sign(Hash hash, SigningPrivateKey signingKey)
Nonstandard.Signature
sign(SimpleDataStructure hash, PrivateKey privKey, SigType type)
Generic signature type.Signature
sign(SimpleDataStructure hash, SigningPrivateKey signingKey)
Generic signature type.boolean
verifySignature(Signature signature, byte[] signedData, int offset, int size, SigningPublicKey verifyingKey)
Verify using any sig type as of 0.9.12 (DSA only prior to that)boolean
verifySignature(Signature signature, byte[] signedData, SigningPublicKey verifyingKey)
Verify using any sig type.boolean
verifySignature(Signature signature, InputStream in, SigningPublicKey verifyingKey)
Verify using DSA-SHA1 ONLYboolean
verifySignature(Signature signature, SHA1Hash hash, SigningPublicKey verifyingKey)
Verify using DSA-SHA1 ONLYboolean
verifySignature(Signature signature, Hash hash, SigningPublicKey verifyingKey)
Nonstandard.boolean
verifySignature(Signature signature, SimpleDataStructure hash, PublicKey pubKey)
Generic signature type.boolean
verifySignature(Signature signature, SimpleDataStructure hash, SigningPublicKey verifyingKey)
Generic signature type.
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Constructor Detail
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DSAEngine
public DSAEngine(I2PAppContext context)
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Method Detail
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getInstance
public static DSAEngine getInstance()
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verifySignature
public boolean verifySignature(Signature signature, byte[] signedData, SigningPublicKey verifyingKey)
Verify using any sig type. Uses TheCrypto code for DSA-SHA1 unless configured to use the java.security libraries.
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verifySignature
public boolean verifySignature(Signature signature, byte[] signedData, int offset, int size, SigningPublicKey verifyingKey)
Verify using any sig type as of 0.9.12 (DSA only prior to that)
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verifySignature
public boolean verifySignature(Signature signature, InputStream in, SigningPublicKey verifyingKey)
Verify using DSA-SHA1 ONLY
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verifySignature
public boolean verifySignature(Signature signature, SHA1Hash hash, SigningPublicKey verifyingKey)
Verify using DSA-SHA1 ONLY- Parameters:
hash
- SHA-1 hash, NOT a SHA-256 hash
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verifySignature
public boolean verifySignature(Signature signature, Hash hash, SigningPublicKey verifyingKey)
Nonstandard. Used by Syndie.- Since:
- 0.8.3 (restored, was removed in 0.8.1 and 0.8.2)
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verifySignature
public boolean verifySignature(Signature signature, SimpleDataStructure hash, SigningPublicKey verifyingKey)
Generic signature type. Warning, nonstandard for EdDSA, double-hashes, not recommended.- Parameters:
hash
- SHA1Hash, Hash, Hash384, or Hash512- Since:
- 0.9.9
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verifySignature
public boolean verifySignature(Signature signature, SimpleDataStructure hash, PublicKey pubKey)
Generic signature type. If you have a Java pubkey, use this, so you don't lose the key parameters, which may be different than the ones defined in SigType. Warning, nonstandard for EdDSA, double-hashes, not recommended.- Parameters:
hash
- SHA1Hash, Hash, Hash384, or Hash512pubKey
- Java key- Since:
- 0.9.9
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sign
public Signature sign(byte[] data, SigningPrivateKey signingKey)
Sign using any key type. Uses TheCrypto code unless configured to use the java.security libraries.- Returns:
- null on error
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sign
public Signature sign(byte[] data, int offset, int length, SigningPrivateKey signingKey)
Sign using any key type as of 0.9.12 (DSA-SHA1 only prior to that)- Returns:
- null on error
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sign
public Signature sign(InputStream in, SigningPrivateKey signingKey)
Sign using DSA-SHA1 ONLY. Reads the stream until EOF. Does not close the stream.- Returns:
- null on error
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sign
public Signature sign(SHA1Hash hash, SigningPrivateKey signingKey)
Sign using DSA-SHA1 ONLY.- Parameters:
hash
- SHA-1 hash, NOT a SHA-256 hash- Returns:
- null on error
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sign
public Signature sign(Hash hash, SigningPrivateKey signingKey)
Nonstandard. Used by Syndie.- Returns:
- null on error
- Since:
- 0.8.3 (restored, was removed in 0.8.1 and 0.8.2)
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sign
public Signature sign(SimpleDataStructure hash, SigningPrivateKey signingKey)
Generic signature type. Warning, nonstandard for EdDSA, double-hashes, not recommended.- Parameters:
hash
- SHA1Hash, Hash, Hash384, or Hash512- Returns:
- null on error
- Since:
- 0.9.9
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sign
public Signature sign(SimpleDataStructure hash, PrivateKey privKey, SigType type)
Generic signature type. If you have a Java privkey, use this, so you don't lose the key parameters, which may be different than the ones defined in SigType. Warning, nonstandard for EdDSA, double-hashes, not recommended.- Parameters:
hash
- SHA1Hash, Hash, Hash384, or Hash512privKey
- Java keytype
- returns a Signature of this type- Returns:
- null on error
- Since:
- 0.9.9
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calculateHash
public SHA1Hash calculateHash(InputStream in)
Deprecated.unusedReads the stream until EOF. Does not close the stream.- Returns:
- hash SHA-1 hash, NOT a SHA-256 hash
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calculateHash
public static SHA1Hash calculateHash(byte[] source, int offset, int len)
- Returns:
- hash SHA-1 hash, NOT a SHA-256 hash
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