> ## Documentation Index
> Fetch the complete documentation index at: https://support.fortanix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Batch sign with one or more private keys.

> The order of batch items in the response matches that of the request.
An individual status code is returned for each batch item.

## OpenAPI

````json POST /crypto/v1/keys/batch/sign
{
  "openapi": "3.0.0",
  "info": {
    "title": "Fortanix DSM REST API",
    "description": "This is a set of REST APIs for accessing the Fortanix Data Security Manager. This includes APIs for managing accounts, and for performing cryptographic and key management operations. \n\n **Note:** \n- All binary input should be base64-encoded. These fields are marked with `format: byte`. \n- For forward compatibility, any API client is expected to ignore any fields in the response not explicitly mentioned in the documentation. We reserve the right to add new fields at any time to provide new functionality without affecting existing API clients.",
    "termsOfService": "https://www.fortanix.com/legal/terms/",
    "contact": {
      "name": "Fortanix Support",
      "url": "https://support.fortanix.com/",
      "email": "support@fortanix.com"
    },
    "license": {
      "name": "Apache 2.0",
      "url": "http://www.apache.org/licenses/LICENSE-2.0.html"
    },
    "version": "0.1.0-20260526"
  },
  "servers": [
    {
      "url": "https://amer.smartkey.io"
    }
  ],
  "paths": {
    "/crypto/v1/keys/batch/sign": {
      "post": {
        "operationId": "BatchSign",
        "tags": [
          "Crypto"
        ],
        "security": [
          {
            "bearerToken": []
          },
          {
            "apiKeyAuth": []
          }
        ],
        "summary": "Batch sign with one or more private keys.",
        "description": "The order of batch items in the response matches that of the request.\nAn individual status code is returned for each batch item.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "array",
                "items": {
                  "$ref": "#/components/schemas/SignRequest"
                }
              }
            }
          }
        },
        "responses": {
          "2XX": {
            "description": "Success result",
            "content": {
              "application/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "$ref": "#/components/schemas/BatchSignResponseItem"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "SignRequest": {
        "allOf": [
          {
            "type": "object",
            "description": "Request to sign data (or hashed data) using an asymmetric key.",
            "properties": {
              "key": {
                "$ref": "#/components/schemas/SobjectDescriptor"
              },
              "hash_alg": {
                "$ref": "#/components/schemas/DigestAlgorithm"
              },
              "hash": {
                "type": "string",
                "format": "byte",
                "description": "Hashed data to be signed. Either `hash` or `data` should be specified;\nit is an error to specify both or none.\nHash should be base64 encoded."
              },
              "data": {
                "type": "string",
                "format": "byte",
                "description": "Data to be signed. Either `hash` or `data` should be specified; it is\nan error to specify both or none.\nData should be base64 encoded."
              },
              "mode": {
                "$ref": "#/components/schemas/SignatureMode"
              },
              "deterministic_signature": {
                "type": "boolean",
                "nullable": true,
                "description": "Whether signatures should be deterministic. Defaults to false. If\nspecified, the value must be compatible with the key's settings."
              },
              "context": {
                "type": "string",
                "format": "byte",
                "description": "The context parameter to be provided to the sign algorithm.\n\nCurrently only ML-DSA keys accept a context parameter;\nthis parameter must not be specified for any other key types."
              }
            }
          }
        ]
      },
      "BatchSignResponseItem": {
        "oneOf": [
          {
            "title": "BatchSignResponseItemSuccess",
            "type": "object",
            "properties": {
              "status": {
                "type": "integer"
              },
              "body": {
                "$ref": "#/components/schemas/SignResponse"
              }
            }
          },
          {
            "title": "BatchSignResponseItemError",
            "type": "object",
            "properties": {
              "status": {
                "type": "integer"
              },
              "error": {
                "type": "string"
              }
            }
          }
        ]
      },
      "SobjectDescriptor": {
        "description": "Uniquely identifies a persisted or transient sobject.",
        "oneOf": [
          {
            "title": "SobjectDescriptorVariantKid",
            "type": "object",
            "properties": {
              "kid": {
                "type": "string",
                "format": "uuid"
              }
            },
            "required": [
              "kid"
            ]
          },
          {
            "title": "SobjectDescriptorVariantName",
            "type": "object",
            "properties": {
              "name": {
                "type": "string",
                "maxLength": 4096,
                "pattern": "^[^\\n]*[^\\s\\n][^\\n]*$"
              }
            },
            "required": [
              "name"
            ]
          },
          {
            "title": "SobjectDescriptorVariantTransientKey",
            "type": "object",
            "properties": {
              "transient_key": {
                "type": "string",
                "format": "byte"
              }
            },
            "required": [
              "transient_key"
            ]
          },
          {
            "title": "SobjectDescriptorVariantInline",
            "type": "object",
            "properties": {
              "inline": {
                "$ref": "#/components/schemas/SobjectDescriptorInline"
              }
            },
            "required": [
              "inline"
            ]
          }
        ]
      },
      "DigestAlgorithm": {
        "description": "A hash algorithm.",
        "type": "string",
        "enum": [
          "BLAKE2B256",
          "BLAKE2B384",
          "BLAKE2B512",
          "BLAKE2S256",
          "RIPEMD160",
          "SSL3",
          "SHA1",
          "SHA224",
          "SHA256",
          "SHA384",
          "SHA512",
          "STREEBOG256",
          "STREEBOG512",
          "SHA3_224",
          "SHA3_256",
          "SHA3_384",
          "SHA3_512"
        ]
      },
      "SignatureMode": {
        "description": "Signature mechanism",
        "oneOf": [
          {
            "$ref": "#/components/schemas/RsaSignaturePadding"
          },
          {
            "$ref": "#/components/schemas/MlDsaMode"
          }
        ]
      },
      "SignResponse": {
        "allOf": [
          {
            "type": "object",
            "description": "Response of a signing request.",
            "properties": {
              "kid": {
                "type": "string",
                "format": "uuid",
                "nullable": true,
                "description": "The ID of the key used for signing. Returned for non-transient keys"
              },
              "signature": {
                "type": "string",
                "format": "byte",
                "description": "Signed data"
              }
            },
            "required": [
              "signature"
            ]
          }
        ]
      },
      "SobjectDescriptorInline": {
        "allOf": [
          {
            "type": "object",
            "properties": {
              "value": {
                "type": "string",
                "format": "byte"
              },
              "obj_type": {
                "$ref": "#/components/schemas/ObjectType"
              }
            },
            "required": [
              "value",
              "obj_type"
            ]
          }
        ]
      },
      "RsaSignaturePadding": {
        "description": "Type of padding to use for RSA signatures. The padding specified must adhere to the key's\nsignature policy. If not specified, the default based on the key's policy will be used.",
        "oneOf": [
          {
            "title": "RsaSignaturePaddingVariantPss",
            "type": "object",
            "properties": {
              "PSS": {
                "$ref": "#/components/schemas/RsaSignaturePaddingPss"
              }
            },
            "required": [
              "PSS"
            ]
          },
          {
            "title": "RsaSignaturePaddingVariantPkcs1V15",
            "type": "object",
            "properties": {
              "PKCS1_V15": {
                "type": "object",
                "properties": {}
              }
            },
            "required": [
              "PKCS1_V15"
            ]
          }
        ]
      },
      "MlDsaMode": {
        "oneOf": [
          {
            "$ref": "#/components/schemas/MlDsaModeVariantPure"
          },
          {
            "$ref": "#/components/schemas/MlDsaModeVariantPreHash"
          },
          {
            "$ref": "#/components/schemas/MlDsaModeVariantExternalMu"
          }
        ],
        "discriminator": {
          "propertyName": "variant",
          "mapping": {
            "PURE": "MlDsaModeVariantPure",
            "PRE_HASH": "MlDsaModeVariantPreHash",
            "EXTERNAL_MU": "MlDsaModeVariantExternalMu"
          }
        }
      },
      "ObjectType": {
        "description": "Type of security object.",
        "type": "string",
        "enum": [
          "AES",
          "ARIA",
          "DES",
          "DES3",
          "SEED",
          "RSA",
          "DSA",
          "EC",
          "KCDSA",
          "ECKCDSA",
          "BIP32",
          "SLIP10",
          "BLS",
          "OPAQUE",
          "HMAC",
          "LEDABETA",
          "ROUND5BETA",
          "SECRET",
          "LMS",
          "XMSS",
          "MLDSA",
          "MLDSABETA",
          "MLKEM",
          "MLKEMBETA",
          "CERTIFICATE",
          "PBE"
        ]
      },
      "RsaSignaturePaddingPss": {
        "allOf": [
          {
            "type": "object",
            "description": "Probabilistic Signature Scheme (PKCS#1 v2.1).",
            "properties": {
              "mgf": {
                "$ref": "#/components/schemas/Mgf"
              }
            },
            "required": [
              "mgf"
            ]
          }
        ]
      },
      "MlDsaModeVariantPure": {
        "allOf": [
          {
            "type": "object",
            "properties": {
              "variant": {
                "type": "string",
                "enum": [
                  "PURE"
                ]
              }
            },
            "required": [
              "variant"
            ]
          },
          {
            "type": "object",
            "properties": {}
          }
        ]
      },
      "MlDsaModeVariantPreHash": {
        "allOf": [
          {
            "type": "object",
            "properties": {
              "variant": {
                "type": "string",
                "enum": [
                  "PRE_HASH"
                ]
              }
            },
            "required": [
              "variant"
            ]
          },
          {
            "type": "object",
            "properties": {}
          }
        ]
      },
      "MlDsaModeVariantExternalMu": {
        "allOf": [
          {
            "type": "object",
            "properties": {
              "variant": {
                "type": "string",
                "enum": [
                  "EXTERNAL_MU"
                ]
              }
            },
            "required": [
              "variant"
            ]
          },
          {
            "type": "object",
            "properties": {}
          }
        ]
      },
      "Mgf": {
        "description": "Specifies the Mask Generating Function (MGF) to use.",
        "oneOf": [
          {
            "title": "MgfVariantMgf1",
            "type": "object",
            "properties": {
              "mgf1": {
                "$ref": "#/components/schemas/MgfMgf1"
              }
            },
            "required": [
              "mgf1"
            ]
          }
        ]
      },
      "MgfMgf1": {
        "allOf": [
          {
            "type": "object",
            "description": "MGF1 algorithm",
            "properties": {
              "hash": {
                "$ref": "#/components/schemas/DigestAlgorithm"
              }
            },
            "required": [
              "hash"
            ]
          }
        ]
      }
    }
  }
}
````