Exceptions¶
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class
cryptography.exceptions.UnsupportedAlgorithm¶ Raised when the requested algorithm, or combination of algorithms is not supported.
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class
cryptography.exceptions.AlreadyFinalized¶ This is raised when a context is used after being finalized.
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class
cryptography.exceptions.InvalidSignature¶ This is raised when signature verification fails. This can occur with HMAC or asymmetric key signature validation.
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class
cryptography.exceptions.NotYetFinalized¶ This is raised when the AEAD tag property is accessed on a context before it is finalized.
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class
cryptography.exceptions.AlreadyUpdated¶ This is raised when additional data is added to a context after update has already been called.
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class
cryptography.exceptions.InvalidKey¶ This is raised when the verify method of a key derivation function’s computed key does not match the expected key.