Decrypts data by using an asymmetric key.

This operation is only supported for asymmetric keys with Usage set to ENCRYPT/DECRYPT. The following table lists the supported asymmetric decryption algorithms.






RSAES-OAEP using SHA-256 and MGF1 with SHA-256



RSAES-OAEP using SHA1 and MGF1 with SHA1

The ciphertext is generated either by calling the AsymmetricEncrypt operation or by using one of the two asymmetric decryption algorithms listed above.


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter Type Required Example Description
Action String Yes AsymmetricDecrypt

The operation that you want to perform. Set the value to AsymmetricDecrypt.

KeyId String Yes 5c438b18-05be-40ad-b6c2-3be6752c****

The globally unique ID of the CMK. This parameter can also be specified as an alias bound to the CMK. For more information, see Use aliases.

KeyVersionId String Yes 2ab1a983-7072-4bbc-a582-584b5bd8****

The globally unique ID of the CMK version.

Algorithm String Yes RSAES_OAEP_SHA_1

The asymmetric decryption algorithm to use.

CiphertextBlob String Yes BQKP+1zK6+ZEMxTP5qaVzcsgXtWplYBKm0NXdSnB5FzliFxE1bSiu4dnEIlca2JpeH7yz1/S6fed630H+hIH6DoM25fTLNcKj+mFB0Xnh9m2+HN59Mn4qyTfcUeadnfCXSWcGBouhXFwcdd2rJ3n337bzTf4jm659gZu3L0i6PLuxM9p7mqdwO0cKJPfGVfhnfMz+f4alMg79WB/NNyE2lyX7/qxvV49ObNrrJbKSFiz8Djocaf0IESNLMbfYI5bXjWkJlX92DQbKhibtQW8ZOJ//ZC6t0AWcUoKL6QDm/dg5koQalcleRinpB+QadFm894sLbVZ9+N4GVsv1Wbjwg==

The ciphertext to be decrypted, which must be Base64-encoded.

Response parameters

Parameter Type Example Description
Plaintext String SGVsbG8gd29ybGQ=

The Base64-encoded plaintext that was generated after decryption.

KeyId String 5c438b18-05be-40ad-b6c2-3be6752c****

The globally unique ID of the CMK.

Note If you set the KeyId parameter to the alias of the CMK, the ID of the CMK to which the alias is bound is returned.
RequestId String 475f1620-b9d3-4d35-b5c6-3fbdd941423d

The ID of the request.

KeyVersionId String 2ab1a983-7072-4bbc-a582-584b5bd8****

The CMK version used to encrypt the plaintext.


Sample requests

&<Common request parameters>

Sample success responses

XML format


JSON format

  "KeyId": "5c438b18-05be-40ad-b6c2-3be6752c****",
  "KeyVersionId": "2ab1a983-7072-4bbc-a582-584b5bd8****",
  "Plaintext": "SGVsbG8gd29ybGQ=",
  "RequestId": "475f1620-b9d3-4d35-b5c6-3fbdd941423d"

Error codes

For a list of error codes, visit the API Error Center.