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layout	page_title	sidebar_current	description
api	Transit Secret Backend - HTTP API	docs-http-secret-transit	This is the API documentation for the Vault Transit secret backend.

Transit Secret Backend HTTP API

This is the API documentation for the Vault Transit secret backend. For general information about the usage and operation of the Transit backend, please see the Vault Transit backend documentation.

This documentation assumes the Transit backend is mounted at the /transit path in Vault. Since it is possible to mount secret backends at any location, please update your API calls accordingly.

Create Key

This endpoint creates a new named encryption key of the specified type. The values set here cannot be changed after key creation.

Method	Path	Produces
`POST`	`/transit/keys/:name`	`204 (empty body)`

Parameters

name (string: <required>) – Specifies the name of the encryption key to create. This is specified as part of the URL.
convergent_encryption (bool: false) – If enabled, the key will support convergent encryption, where the same plaintext creates the same ciphertext. This requires derived to be set to true. When enabled, each encryption(/decryption/rewrap/datakey) operation will derive a nonce value rather than randomly generate it. Note that while this is useful for particular situations, all nonce values used with a given context value must be unique or it will compromise the security of your key, and the key space for nonces is 96 bit -- not as large as the AES key itself.
derived (bool: false) – Specifies if key derivation is to be used. If enabled, all encrypt/decrypt requests to this named key must provide a context which is used for key derivation.
exportable (bool: false) – Specifies if the raw key is exportable.
type (string: "aes256-gcm96") – Specifies the type of key to create. The currently-supported types are:
- aes256-gcm96 – AES-256 wrapped with GCM using a 12-byte nonce size (symmetric, supports derivation)
- ecdsa-p256 – ECDSA using the P-256 elliptic curve (asymmetric)
- ed25519 – ED25519 (asymmetric, supports derivation)

Sample Payload

{
  "type": "ecdsa-p256",
  "derived": true
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/keys/my-key

Read Key

This endpoint returns information about a named encryption key. The keys object shows the creation time of each key version; the values are not the keys themselves. Depending on the type of key, different information may be returned, e.g. an asymmetric key will return its public key in a standard format for the type.

Method	Path	Produces
`GET`	`/transit/keys/:name`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key to read. This is specified as part of the URL.

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    https://vault.rocks/v1/transit/keys/my-key

Sample Response

{
  "data": {
    "type": "aes256-gcm96",
    "deletion_allowed": false,
    "derived": false,
    "exportable": false,
    "keys": {
      "1": 1442851412
    },
    "min_decryption_version": 1,
    "min_encryption_version": 0,
    "name": "foo",
    "supports_encryption": true,
    "supports_decryption": true,
    "supports_derivation": true,
    "supports_signing": false
  }
}

List Keys

This endpoint returns a list of keys. Only the key names are returned (not the actual keys themselves).

Method	Path	Produces
`LIST`	`/transit/keys`	`200 application/json`
`GET`	`/transit/keys?list=true`	`200 application/json`

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request LIST \
    https://vault.rocks/v1/transit/keys

Sample Response

{
  "data": {
    "keys": ["foo", "bar"]
  },
  "lease_duration": 0,
  "lease_id": "",
  "renewable": false
}

Delete Key

This endpoint deletes a named encryption key. It will no longer be possible to decrypt any data encrypted with the named key. Because this is a potentially catastrophic operation, the deletion_allowed tunable must be set in the key's /config endpoint.

Method	Path	Produces
`DELETE`	`/transit/keys/:name`	`204 (empty body)`

Parameters

name (string: <required>) – Specifies the name of the encryption key to delete. This is specified as part of the URL.

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request DELETE \
    https://vault.rocks/v1/transit/keys/my-key

Update Key Configuration

This endpoint allows tuning configuration values for a given key. (These values are returned during a read operation on the named key.)

Method	Path	Produces
`POST`	`/transit/keys/:name/config`	`204 (empty body)`

Parameters

min_decryption_version (int: 0) – Specifies the minimum version of ciphertext allowed to be decrypted. Adjusting this as part of a key rotation policy can prevent old copies of ciphertext from being decrypted, should they fall into the wrong hands. For signatures, this value controls the minimum version of signature that can be verified against. For HMACs, this controls the minimum version of a key allowed to be used as the key for verification.
min_encryption_version (int: 0) – Specifies the minimum version of the key that can be used to encrypt plaintext, sign payloads, or generate HMACs. Must be 0 (which will use the latest version) or a value greater or equal to min_decryption_version.
deletion_allowed (bool: false)- Specifies if the key is allowed to be deleted.

Sample Payload

{
  "deletion_allowed": true
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/keys/my-key/config

Rotate Key

This endpoint rotates the version of the named key. After rotation, new plaintext requests will be encrypted with the new version of the key. To upgrade ciphertext to be encrypted with the latest version of the key, use the rewrap endpoint. This is only supported with keys that support encryption and decryption operations.

Method	Path	Produces
`POST`	`/transit/keys/:name/rotate`	`204 (empty body)`

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    https://vault.rocks/v1/transit/keys/my-key/rotate

Export Key

This endpoint returns the named key. The keys object shows the value of the key for each version. If version is specified, the specific version will be returned. If latest is provided as the version, the current key will be provided. Depending on the type of key, different information may be returned. The key must be exportable to support this operation and the version must still be valid.

Method	Path	Produces
`GET`	`/transit/export/:key_type/:name(/:version)`	`200 application/json`

Parameters

key_type (string: <required>) – Specifies the type of the key to export. This is specified as part of the URL. Valid values are:
- encryption-key
- signing-key
- hmac-key
name (string: <required>) – Specifies the name of the key to read information about. This is specified as part of the URL.
version (string: "") – Specifies the version of the key to read. If omitted, all versions of the key will be returned. This is specified as part of the URL. If the version is set to latest, the current key will be returned.

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    https://vault.rocks/v1/transit/export/encryption-key/my-key/1

Sample Response

{
  "data": {
    "name": "foo",
    "keys": {
      "1": "eyXYGHbTmugUJn6EtYD/yVEoF6pCxm4R/cMEutUm3MY=",
      "2": "Euzymqx6iXjS3/NuGKDCiM2Ev6wdhnU+rBiKnJ7YpHE="
    }
  }
}

Encrypt Data

This endpoint encrypts the provided plaintext using the named key. Currently, this only supports symmetric keys. This path supports the create and update policy capabilities as follows: if the user has the create capability for this endpoint in their policies, and the key does not exist, it will be upserted with default values (whether the key requires derivation depends on whether the context parameter is empty or not). If the user only has update capability and the key does not exist, an error will be returned.

Method	Path	Produces
`POST`	`/transit/encrypt/:name`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key to encrypt against. This is specified as part of the URL.
plaintext (string: <required>) – Specifies base64 encoded plaintext to be encoded.
context (string: "") – Specifies the base64 encoded context for key derivation. This is required if key derivation is enabled for this key.
key_version (int: 0) – Specifies the version of the key to use for encryption. If not set, uses the latest version. Must be greater than or equal to the key's min_encryption_version, if set.
nonce (string: "") – Specifies the base64 encoded nonce value. This must be provided if convergent encryption is enabled for this key and the key was generated with Vault 0.6.1. Not required for keys created in 0.6.2+. The value must be exactly 96 bits (12 bytes) long and the user must ensure that for any given context (and thus, any given encryption key) this nonce value is never reused.

batch_input (array<object>: nil) – Specifies a list of items to be encrypted in a single batch. When this parameter is set, if the parameters 'plaintext', 'context' and 'nonce' are also set, they will be ignored. The format for the input is:

[
  {
    "context": "c2FtcGxlY29udGV4dA==",
    "plaintext": "dGhlIHF1aWNrIGJyb3duIGZveA=="
  },
  {
    "context": "YW5vdGhlcnNhbXBsZWNvbnRleHQ=",
    "plaintext": "dGhlIHF1aWNrIGJyb3duIGZveA=="
  },
]

type (string: "aes256-gcm96") –This parameter is required when encryption key is expected to be created. When performing an upsert operation, the type of key to create. Currently, "aes256-gcm96" (symmetric) is the only type supported.
convergent_encryption (string: "") – This parameter will only be used when a key is expected to be created. Whether to support convergent encryption. This is only supported when using a key with key derivation enabled and will require all requests to carry both a context and 96-bit (12-byte) nonce. The given nonce will be used in place of a randomly generated nonce. As a result, when the same context and nonce are supplied, the same ciphertext is generated. It is very important when using this mode that you ensure that all nonces are unique for a given context. Failing to do so will severely impact the ciphertext's security.

Sample Payload

{
  "plaintext": "dGhlIHF1aWNrIGJyb3duIGZveA=="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/encrypt/my-key

Sample Response

{
  "data": {
    "ciphertext": "vault:v1:abcdefgh"
  }
}

Decrypt Data

This endpoint decrypts the provided ciphertext using the named key. Currently, this only supports symmetric keys.

Method	Path	Produces
`POST`	`/transit/decrypt/:name`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key to decrypt against. This is specified as part of the URL.
ciphertext (string: <required>) – Specifies the ciphertext to decrypt.
context (string: "") – Specifies the base64 encoded context for key derivation. This is required if key derivation is enabled.
nonce (string: "") – Specifies a base64 encoded nonce value used during encryption. Must be provided if convergent encryption is enabled for this key and the key was generated with Vault 0.6.1. Not required for keys created in 0.6.2+.

batch_input (array<object>: nil) – Specifies a list of items to be decrypted in a single batch. When this parameter is set, if the parameters 'ciphertext', 'context' and 'nonce' are also set, they will be ignored. Format for the input goes like this:

[
  {
    "context": "c2FtcGxlY29udGV4dA==",
    "ciphertext": "vault:v1:/DupSiSbX/ATkGmKAmhqD0tvukByrx6gmps7dVI="
  },
  {
    "context": "YW5vdGhlcnNhbXBsZWNvbnRleHQ=",
    "ciphertext": "vault:v1:XjsPWPjqPrBi1N2Ms2s1QM798YyFWnO4TR4lsFA="
  },
]

Sample Payload

{
  "ciphertext": "vault:v1:XjsPWPjqPrBi1N2Ms2s1QM798YyFWnO4TR4lsFA="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/decrypt/my-key

Sample Response

{
  "data": {
    "plaintext": "dGhlIHF1aWNrIGJyb3duIGZveAo="
  }
}

Rewrap Data

This endpoint rewraps the provided ciphertext using the latest version of the named key. Because this never returns plaintext, it is possible to delegate this functionality to untrusted users or scripts.

Method	Path	Produces
`POST`	`/transit/rewrap/:name`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key to re-encrypt against. This is specified as part of the URL.
ciphertext (string: <required>) – Specifies the ciphertext to re-encrypt.
context (string: "") – Specifies the base64 encoded context for key derivation. This is required if key derivation is enabled.
key_version (int: 0) – Specifies the version of the key to use for the operation. If not set, uses the latest version. Must be greater than or equal to the key's min_encryption_version, if set.
nonce (string: "") – Specifies a base64 encoded nonce value used during encryption. Must be provided if convergent encryption is enabled for this key and the key was generated with Vault 0.6.1. Not required for keys created in 0.6.2+.

[
  {
    "context": "c2FtcGxlY29udGV4dA==",
    "ciphertext": "vault:v1:/DupSiSbX/ATkGmKAmhqD0tvukByrx6gmps7dVI="
  },
  {
    "context": "YW5vdGhlcnNhbXBsZWNvbnRleHQ=",
    "ciphertext": "vault:v1:XjsPWPjqPrBi1N2Ms2s1QM798YyFWnO4TR4lsFA="
  },
]

Sample Payload

{
  "ciphertext": "vault:v1:XjsPWPjqPrBi1N2Ms2s1QM798YyFWnO4TR4lsFA="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/rewrap/my-key

Sample Response

{
  "data": {
    "ciphertext": "vault:v2:abcdefgh"
  }
}

Generate Data Key

This endpoint generates a new high-entropy key and the value encrypted with the named key. Optionally return the plaintext of the key as well. Whether plaintext is returned depends on the path; as a result, you can use Vault ACL policies to control whether a user is allowed to retrieve the plaintext value of a key. This is useful if you want an untrusted user or operation to generate keys that are then made available to trusted users.

Method	Path	Produces
`POST`	`/transit/datakey/:type/:name`	`200 application/json`

Parameters

type (string: <required>) – Specifies the type of key to generate. If plaintext, the plaintext key will be returned along with the ciphertext. If wrapped, only the ciphertext value will be returned. This is specified as part of the URL.
name (string: <required>) – Specifies the name of the encryption key to use to encrypt the datakey. This is specified as part of the URL.
context (string: "") – Specifies the key derivation context, provided as a base64-encoded string. This must be provided if derivation is enabled.
nonce (string: "") – Specifies a nonce value, provided as base64 encoded. Must be provided if convergent encryption is enabled for this key and the key was generated with Vault 0.6.1. Not required for keys created in 0.6.2+. The value must be exactly 96 bits (12 bytes) long and the user must ensure that for any given context (and thus, any given encryption key) this nonce value is never reused.
bits (int: 256) – Specifies the number of bits in the desired key. Can be 128, 256, or 512.

Sample Payload

{
  "context": "Ab3=="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/datakey/plaintext/my-key

Sample Response

{
  "data": {
    "plaintext": "dGhlIHF1aWNrIGJyb3duIGZveAo=",
    "ciphertext": "vault:v1:abcdefgh"
  }
}

Generate Random Bytes

This endpoint returns high-quality random bytes of the specified length.

Method	Path	Produces
`POST`	`/transit/random(/:bytes)`	`200 application/json`

Parameters

bytes (int: 32) – Specifies the number of bytes to return. This value can be specified either in the request body, or as a part of the URL.
format (string: "base64") – Specifies the output encoding. Valid options are hex or base64.

Sample Payload

{
  "format": "hex"
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/random/164

Sample Response

{
  "data": {
    "random_bytes": "dGhlIHF1aWNrIGJyb3duIGZveAo="
  }
}

Hash Data

This endpoint returns the cryptographic hash of given data using the specified algorithm.

Method	Path	Produces
`POST`	`/transit/hash(/:algorithm)`	`200 application/json`

Parameters

algorithm (string: "sha2-256") – Specifies the hash algorithm to use. This can also be specified as part of the URL. Currently-supported algorithms are:
- sha2-224
- sha2-256
- sha2-384
- sha2-512
input (string: <required>) – Specifies the base64 encoded input data.
format (string: "hex") – Specifies the output encoding. This can be either hex or base64.

Sample Payload

{
  "input": "adba32=="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/hash/sha2-512

Sample Response

{
  "data": {
    "sum": "dGhlIHF1aWNrIGJyb3duIGZveAo="
  }
}

Generate HMAC

This endpoint returns the digest of given data using the specified hash algorithm and the named key. The key can be of any type supported by transit; the raw key will be marshaled into bytes to be used for the HMAC function. If the key is of a type that supports rotation, the latest (current) version will be used.

Method	Path	Produces
`POST`	`/transit/hmac/:name(/:algorithm)`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key to generate hmac against. This is specified as part of the URL.
key_version (int: 0) – Specifies the version of the key to use for the operation. If not set, uses the latest version. Must be greater than or equal to the key's min_encryption_version, if set.
algorithm (string: "sha2-256") – Specifies the hash algorithm to use. This can also be specified as part of the URL. Currently-supported algorithms are:
- sha2-224
- sha2-256
- sha2-384
- sha2-512
input (string: <required>) – Specifies the base64 encoded input data.

Sample Payload

{
  "input": "adba32=="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/hmac/my-key/sha2-512

Sample Response

{
  "data": {
    "hmac": "dGhlIHF1aWNrIGJyb3duIGZveAo="
  }
}

Sign Data

This endpoint returns the cryptographic signature of the given data using the named key and the specified hash algorithm. The key must be of a type that supports signing.

Method	Path	Produces
`POST`	`/transit/sign/:name(/:algorithm)`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key to use for signing. This is specified as part of the URL.
key_version (int: 0) – Specifies the version of the key to use for signing. If not set, uses the latest version. Must be greater than or equal to the key's min_encryption_version, if set.
algorithm (string: "sha2-256") – Specifies the hash algorithm to use for supporting key types (notably, not including ed25519 which specifies its own hash algorithm). This can also be specified as part of the URL. Currently-supported algorithms are:
- none
- sha2-224
- sha2-256
- sha2-384
- sha2-512
input (string: <required>) – Specifies the base64 encoded input data.

Sample Payload

{
  "input": "adba32=="
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/sign/my-key/sha2-512

Sample Response

{
  "data": {
    "signature": "vault:v1:MEUCIQCyb869d7KWuA0hBM9b5NJrmWzMW3/pT+0XYCM9VmGR+QIgWWF6ufi4OS2xo1eS2V5IeJQfsi59qeMWtgX0LipxEHI="
  }
}

Verify Signed Data

This endpoint returns whether the provided signature is valid for the given data.

Method	Path	Produces
`POST`	`/transit/verify/:name(/:algorithm)`	`200 application/json`

Parameters

name (string: <required>) – Specifies the name of the encryption key that was used to generate the signature or HMAC.
algorithm (string: "sha2-256") – Specifies the hash algorithm to use. This can also be specified as part of the URL. Currently-supported algorithms are:
- none
- sha2-224
- sha2-256
- sha2-384
- sha2-512
input (string: <required>) – Specifies the base64 encoded input data.
signature (string: "") – Specifies the signature output from the /transit/sign function. Either this must be supplied or hmac must be supplied.
hmac (string: "") – Specifies the signature output from the /transit/hmac function. Either this must be supplied or signature must be supplied.

Sample Payload

{
  "input": "abcd13==",
  "signature": "vault:v1:MEUCIQCyb869d7KWuA..."
}

Sample Request

$ curl \
    --header "X-Vault-Token: ..." \
    --request POST \
    --data @payload.json \
    https://vault.rocks/v1/transit/verify/my-key/sha2-512

Sample Response

{
  "data": {
    "valid": true
  }
}

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Transit Secret Backend HTTP API

Create Key

Parameters

Sample Payload

Sample Request

Read Key

Parameters

Sample Request

Sample Response

List Keys

Sample Request

Sample Response

Delete Key

Parameters

Sample Request

Update Key Configuration

Parameters

Sample Payload

Sample Request

Rotate Key

Sample Request

Export Key

Parameters

Sample Request

Sample Response

Encrypt Data

Parameters

Sample Payload

Sample Request

Sample Response

Decrypt Data

Parameters

Sample Payload

Sample Request

Sample Response

Rewrap Data

Parameters

Sample Payload

Sample Request

Sample Response

Generate Data Key

Parameters

Sample Payload

Sample Request

Sample Response

Generate Random Bytes

Parameters

Sample Payload

Sample Request

Sample Response

Hash Data

Parameters

Sample Payload

Sample Request

Sample Response

Generate HMAC

Parameters

Sample Payload

Sample Request

Sample Response

Sign Data

Parameters

Sample Payload

Sample Request

Sample Response

Verify Signed Data

Parameters

Sample Payload

Sample Request

Sample Response

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