The SubtleCrypto.decrypt() method returns a Promise of the cleartext corresponding to the ciphertext, algorithm and key given as parameters.


var result = crypto.decrypt(algo, key, ciphertext);


  • algo is a DOMString defining the decryption function to use. Supported values are: AES-CBC, AES-CTR, AES-GCM, and RSA-OAEP.
  • key is a CryptoKey containing the key to be used for decryption.
  • ciphertext is a ArrayBuffer or an ArrayBufferView containing the data to be decrypted, the ciphertext.

Return value


The promise is rejected when the following exception is encountered:

  • InvalidAccessError when the encryption key is not a key for the requested decryption algorithm or when trying to use an algorithm that is either unknown or isn't suitable for decryption.


Specification Status Comment
Web Cryptography API
The definition of 'SubtleCrypto.decrypt()' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 37 (Yes) 34 (34) No support ? No support
Feature Android Chrome for Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) 37 (Yes) 34.0 (34) No support ? No support

See also

Document Tags and Contributors

 Contributors to this page: abbycar, oughter, pstricker, ignisvulpis, teoli
 Last updated by: abbycar,