contract-go

IBM Confidential Computing Contract Go Library - API Documentation

Introduction

The contract-go library provides a comprehensive API for working with IBM Confidential Computing services (formerly known as IBM Hyper Protect services). This documentation covers all available functions, their parameters, return values, and usage examples.

What is a Contract?

A contract is a definition file in YAML format that is used to configure and deploy IBM Confidential Computing workloads. The contract specifies workload details, environment configuration, and attestation settings. When a virtual server instance boots, the bootloader decrypts and validates the contract, then brings up the workload.

Contract Sections

A contract has four valid high-level sections:

Section Required Description
workload Yes Defines the container workload, registry authentication, images, and volumes
env Yes Specifies the deployment environment, logging, and signing key
attestationPublicKey No RSA public key for encrypting attestation records
envWorkloadSignature No Signature of the workload and env sections for integrity verification

Encryption Format

Encrypted sections use the format: hyper-protect-basic.<encrypted-password>.<encrypted-data>

The encryption process:

  1. Generate a random 32-byte AES password
  2. Encrypt the password with the IBM encryption certificate (RSA)
  3. Encrypt the section data with the AES password (AES-256-CBC)
  4. Combine as hyper-protect-basic.<base64-encrypted-password>.<base64-encrypted-data>

Supported Platforms

Platform Identifier Official Name
ccrt IBM Confidential Computing Container Runtime (CCRT)
ccrv IBM Confidential Computing Container Runtime for Red Hat Virtualization Solutions (CCRV)
ccco IBM Confidential Computing Containers for Red Hat OpenShift Container Platform (CCCO)

Table of Contents

Configuration

Prerequisites

Environment Variables

OPENSSL_BIN (Optional)

Configure the path to the OpenSSL binary. This is useful on systems where OpenSSL is not in the system PATH (e.g., Windows).

Linux/macOS:

export OPENSSL_BIN=/usr/bin/openssl

Windows (PowerShell):

$env:OPENSSL_BIN="C:\Program Files\OpenSSL-Win64\bin\openssl.exe"

Windows (Command Prompt):

set OPENSSL_BIN=C:\Program Files\OpenSSL-Win64\bin\openssl.exe

Password-Protected Private Keys

The following functions support an optional password parameter for encrypted private keys:

Usage:

// Unencrypted private key - pass empty string
result, err := contract.HpcrContractSignedEncrypted(contractYAML, "ccrt", "", privateKey, "")

// Encrypted private key - provide password
result, err := contract.HpcrContractSignedEncrypted(contractYAML, "ccrt", "", encryptedKey, "your-password")

Create encrypted private key:

openssl genrsa -aes256 -out private_encrypted.pem 4096

Error: If encrypted key is provided without password:

private key is encrypted but no password provided - use the password parameter to unlock the key

Attestation Functions

HpcrGetAttestationRecords

Decrypts encrypted attestation records generated by Hyper Protect Services.

Package: github.com/ibm-hyper-protect/contract-go/v2/attestation

Signature:

func HpcrGetAttestationRecords(data, privateKey, password string) (string, error)

Parameters:

Parameter Type Required/Optional Description
data string Required Encrypted attestation data in the format hyper-protect-basic.<password>.<data>
privateKey string Required RSA private key (PEM format) used to decrypt the password
password string Optional Password for encrypted private key (empty string if private key is not encrypted)

Returns:

Return Type Description
Attestation Records string Decrypted attestation records
Error error Error if decryption fails or parameters are invalid

Example (Unencrypted Private Key):

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/attestation"
)

func main() {
    // Encrypted attestation data received from HPVS
    encryptedData := "hyper-protect-basic.aBcD123..."

    // Your RSA private key
    privateKey := `-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----`

    // Decrypt attestation records (no password for unencrypted key)
    records, err := attestation.HpcrGetAttestationRecords(encryptedData, privateKey, "")
    if err != nil {
        log.Fatalf("Failed to decrypt attestation: %v", err)
    }

    fmt.Println("Attestation Records:", records)
}

Example (Password-Protected Private Key):

// Encrypted private key
encryptedPrivateKey := `-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-256-CBC,1234567890ABCDEF

MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----`

password := "your-secure-password"

// Decrypt attestation records with password-protected key
records, err := attestation.HpcrGetAttestationRecords(encryptedData, encryptedPrivateKey, password)
if err != nil {
    log.Fatalf("Failed to decrypt attestation: %v", err)
}

fmt.Println("Attestation Records:", records)

Common Errors:

HpcrVerifySignatureAttestationRecords

Verifies the signature of decrypted attestation records against an IBM attestation certificate to ensure authenticity and integrity.

Package: github.com/ibm-hyper-protect/contract-go/v2/attestation

Signature:

func HpcrVerifySignatureAttestationRecords(attestationRecords, signature, attestationCert string) error

Parameters:

Parameter Type Required/Optional Description
attestationRecords string Required Decrypted attestation records content (se-checksums.txt)
signature string Required Binary signature data (se-signature.bin content)
attestationCert string Required IBM attestation certificate in PEM format

Returns:

Return Type Description
Error error nil if signature verification succeeds, error if verification fails

Example:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/attestation"
)

func main() {
    // First, decrypt attestation records
    encryptedData := "hyper-protect-basic.aBcD123..." // From HPVS
    privateKey := `-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----`

    records, err := attestation.HpcrGetAttestationRecords(encryptedData, privateKey)
    if err != nil {
        log.Fatalf("failed to decrypt attestation records - %v", err)
    }

    // Read signature file (se-signature.bin)
    signatureData, err := os.ReadFile("se-signature.bin")
    if err != nil {
        log.Fatalf("failed to read signature file - %v", err)
    }

    // Read IBM attestation certificate
    certData, err := os.ReadFile("ibm-attestation-cert.pem")
    if err != nil {
        log.Fatalf("failed to read attestation certificate - %v", err)
    }

    // Verify signature
    err = attestation.HpcrVerifySignatureAttestationRecords(
        records,
        signatureData,
        certData,
    )
    if err != nil {
        log.Fatalf("signature verification failed - %v", err)
    }
}

Use Cases:

Common Errors:

Certificate Functions

HpcrDownloadEncryptionCertificates

Downloads encryption certificates for specified HPVS versions from IBM Cloud.

Package: github.com/ibm-hyper-protect/contract-go/v2/certificate

Signature:

func HpcrDownloadEncryptionCertificates(versionList []string, formatType, certDownloadUrlTemplate string) (string, error)

Parameters:

Parameter Type Required/Optional Description
versionList []string Required List of HPCR versions to download (e.g., ["1.1.14", "1.1.15"])
formatType string Optional Output format: "json" or "yaml" (defaults to "json" if empty)
certDownloadUrlTemplate string Optional Custom URL template (uses IBM Cloud default if empty)

Default URL Template:

https://hpvsvpcubuntu.s3.us.cloud-object-storage.appdomain.cloud/s390x-{{.Patch}}/ibm-hyper-protect-container-runtime-{{.Major}}-{{.Minor}}-s390x-{{.Patch}}-encrypt.crt

Returns:

Return Type Description
Certificates string JSON or YAML formatted map of versions to certificates
Error error Error if download fails or version not found

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
)

func main() {
    // Download certificates for multiple versions
    versions := []string{"1.1.14", "1.1.15", "1.1.16"}

    // Get as JSON (default)
    certsJSON, err := certificate.HpcrDownloadEncryptionCertificates(versions, "json", "")
    if err != nil {
        log.Fatalf("Failed to download certificates: %v", err)
    }

    fmt.Printf("Downloaded certificates:\n%s\n", certsJSON)

    // Or get as YAML
    certsYAML, err := certificate.HpcrDownloadEncryptionCertificates(versions, "yaml", "")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("YAML format:\n%s\n", certsYAML)
}

Common Errors:

HpcrGetEncryptionCertificateFromJson

Extracts a specific version’s encryption certificate from the output of HpcrDownloadEncryptionCertificates.

Package: github.com/ibm-hyper-protect/contract-go/v2/certificate

Signature:

func HpcrGetEncryptionCertificateFromJson(encryptionCertificateJson, version string) (string, string, string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
encryptionCertificateJson string Required JSON/YAML output from HpcrDownloadEncryptionCertificates
version string Required Specific version to extract (e.g., "1.1.15")

Returns:

Return Type Description
Version string The requested version number
Certificate string PEM-formatted encryption certificate
Expiry date string Expiry date of encryption certificate
Expiry Days string Expiry days of encryption certificate
Status string Status of encryption certificate
Error error Error if version not found or JSON invalid

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
)

func main() {
    // First, download certificates
    versions := []string{"1.1.14", "1.1.15"}
    certsJSON, err := certificate.HpcrDownloadEncryptionCertificates(versions, "json", "")
    if err != nil {
        log.Fatal(err)
    }

    // Extract specific version
    version, cert, expiry_date, expiry_days, status, err := certificate.HpcrGetEncryptionCertificateFromJson(certsJSON, "1.1.15")
    if err != nil {
        log.Fatalf("Failed to get certificate: %v", err)
    }

    fmt.Printf("Version: %s\n", version)
    fmt.Printf("Certificate:\n%s\n", cert)
    fmt.Printf("Expiry date: %s\n", expiry_date)
    fmt.Printf("Expiry days: %s\n", expiry_days)
    fmt.Printf("Status: %s\n", status)
}

Common Errors:

HpcrValidateEncryptionCertificate

Validates and returns expiry details of an encryption certificate.

Package: github.com/ibm-hyper-protect/contract-go/v2/certificate

Signature:

func HpcrValidateEncryptionCertificate(encryptionCert string) (string, error)

Parameters:

Parameter Type Required/Optional Description
encryptionCert string Required PEM-formatted encryption certificate

Returns:

Return Type Description
Expiry Details string Certificate expiration information
Error error Error if certificate is invalid or expired

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
)

func main() {
    cert := `-----BEGIN CERTIFICATE-----
MIIDXTCCAkWgAwIBAgIJAKL...
-----END CERTIFICATE-----`

    expiryInfo, err := certificate.HpcrValidateEncryptionCertificate(cert)
    if err != nil {
        log.Fatalf("Certificate validation failed: %v", err)
    }

    fmt.Printf("Certificate expiry: %s\n", expiryInfo)
}

Use Cases:

Common Errors:

HpcrVerifyEncryptionCertificateDocument

Validates an encryption certificate document by checking issuer chain, document signature, and validity dates.

Package: github.com/ibm-hyper-protect/contract-go/v2/certificate

Signature:

func HpcrVerifyEncryptionCertificateDocument(encryptionCert string, ibmIntermediateCert string, digicertIntermediateCert string, digicertRootCert string) (bool, string, error)

Parameters:

Parameter Type Required/Optional Description
encryptionCert string Required Encryption certificate document content
ibmIntermediateCert string Required IBM intermediate certificate content
digicertIntermediateCert string Required DigiCert intermediate certificate content
digicertRootCert string Required DigiCert root certificate content

Returns:

Return Type Description
Valid bool true if validation succeeds, false otherwise
Message string Validation result details
Error error Error with stage-specific reason on failure

Example:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
)

func mustRead(path string) string {
    b, err := os.ReadFile(path)
    if err != nil {
        log.Fatal(err)
    }
    return string(b)
}

func main() {
    valid, msg, err := certificate.HpcrVerifyEncryptionCertificateDocument(
        mustRead("ibm-hyper-protect-container-runtime-*-encrypt.crt"),
        mustRead("ibm-hyper-protect-container-runtime-*-intermediate.crt"),
        mustRead("DigiCertTrustedG4CodeSigningRSA4096SHA3842021CA1.crt.pem"),
        mustRead("DigiCertTrustedRootG4.crt.pem"),
    )
    if err != nil || !valid {
        log.Fatalf("Encryption certificate document validation failed: %v", err)
    }

    fmt.Println(msg)
}

Common Errors:

HpcrVerifyAttestationCertificateDocument

Validates an attestation certificate document by checking issuer chain, document signature, and validity dates.

Package: github.com/ibm-hyper-protect/contract-go/v2/certificate

Signature:

func HpcrVerifyAttestationCertificateDocument(attestationCert string, ibmIntermediateCert string, digicertIntermediateCert string, digicertRootCert string) (bool, string, error)

Parameters:

Parameter Type Required/Optional Description
attestationCert string Required Attestation certificate document content
ibmIntermediateCert string Required IBM intermediate certificate content
digicertIntermediateCert string Required DigiCert intermediate certificate content
digicertRootCert string Required DigiCert root certificate content

Returns:

Return Type Description
Valid bool true if validation succeeds, false otherwise
Message string Validation result details
Error error Error with stage-specific reason on failure

Example:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
)

func mustRead(path string) string {
    b, err := os.ReadFile(path)
    if err != nil {
        log.Fatal(err)
    }
    return string(b)
}

func main() {
    valid, msg, err := certificate.HpcrVerifyAttestationCertificateDocument(
        mustRead("ibm-hyper-protect-container-runtime-*-attestation.crt"),
        mustRead("ibm-hyper-protect-container-runtime-*-intermediate.crt"),
        mustRead("DigiCertTrustedG4CodeSigningRSA4096SHA3842021CA1.crt.pem"),
        mustRead("DigiCertTrustedRootG4.crt.pem"),
    )
    if err != nil || !valid {
        log.Fatalf("Attestation certificate document validation failed: %v", err)
    }

    fmt.Println(msg)
}

Common Errors:

HpcrValidateCertificateRevocationList

Validates the CRL (metadata + signature) and ensures the provided certificate serial is not revoked.

Package: github.com/ibm-hyper-protect/contract-go/v2/certificate

Signature:

func HpcrValidateCertificateRevocationList(certificateDocument string, ibmIntermediateCert string) (bool, string, error)

Parameters:

Parameter Type Required/Optional Description
certificateDocument string Required Certificate document content (encryption or attestation)
ibmIntermediateCert string Required IBM intermediate certificate content used for CRL signature verification

Returns:

Return Type Description
Valid bool true if CRL validation succeeds and the certificate is not revoked
Message string CRL validation and revocation result details
Error error Error with stage-specific reason on failure

Example:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
)

func mustRead(path string) string {
    b, err := os.ReadFile(path)
    if err != nil {
        log.Fatal(err)
    }
    return string(b)
}

func main() {
    encryptionCert := mustRead("ibm-hyper-protect-container-runtime-*-encrypt.crt")
    intermediateCert := mustRead("ibm-hyper-protect-container-runtime-*-intermediate.crt")

    valid, msg, err := certificate.HpcrValidateCertificateRevocationList(
        encryptionCert,
        intermediateCert,
    )
    if err != nil || !valid {
        log.Fatalf("CRL validation failed: %v", err)
    }

    fmt.Println(msg)
}

Common Errors:

Image Functions

HpcrSelectImage

Selects the latest HPCR image from IBM Cloud images based on version constraints and semantic versioning.

Package: github.com/ibm-hyper-protect/contract-go/v2/image

Signature:

func HpcrSelectImage(imageJsonData, versionSpec string) (string, string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
imageJsonData string Required JSON array of IBM Cloud images
versionSpec string Optional Version constraint (e.g., ">=1.1.0", "~1.1.14") - selects latest if empty

Supported Image Sources:

  1. Terraform - Output from data.ibm_is_images.hyper_protect_images.images
  2. IBM Cloud API: 
    curl -X GET "https://<region>.cloud.ibm.com/v1/images?version=2022-09-13&generation=2" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" | jq .images
  3. IBM Cloud CLI: 
    ibmcloud is images --json

Returns:

Return Type Description
Image ID string IBM Cloud image ID
Image Name string Full image name
Checksum string SHA256 checksum of the image
Version string Semantic version (e.g., "1.1.15")
Error error Error if no matching image found

Example:

package main

import (
    "fmt"
    "log"
    "os/exec"

    "github.com/ibm-hyper-protect/contract-go/v2/image"
)

func main() {
    // Get images from IBM Cloud CLI
    cmd := exec.Command("ibmcloud", "is", "images", "--json")
    output, err := cmd.Output()
    if err != nil {
        log.Fatalf("Failed to get images: %v", err)
    }

    // Select latest image version >= 1.1.0
    imageID, imageName, checksum, version, err := image.HpcrSelectImage(
        string(output),
        ">=1.1.0",
    )
    if err != nil {
        log.Fatalf("Failed to select image: %v", err)
    }

    fmt.Printf("Selected HPCR Image:\n")
    fmt.Printf("  ID:       %s\n", imageID)
    fmt.Printf("  Name:     %s\n", imageName)
    fmt.Printf("  Version:  %s\n", version)
    fmt.Printf("  Checksum: %s\n", checksum)

    // Use with specific version constraint
    imageID, _, _, version, err = image.HpcrSelectImage(string(output), "~1.1.14")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Selected version ~1.1.14: %s\n", version)
}

Version Constraint Examples:

Common Errors:

Image Selection Criteria: The function filters images based on:

Contract Functions

HpcrText

Generates Base64-encoded representation of plain text data with integrity checksums.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrText(plainText string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
plainText string Required Text data to encode

Returns:

Return Type Description
Base64 Data string Base64-encoded text
Input Checksum string SHA256 hash of original text
Output Checksum string SHA256 hash of Base64-encoded data
Error error Error if text is empty

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    text := "Hello, Hyper Protect World!"

    encoded, inputHash, outputHash, err := contract.HpcrText(text)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Original text: %s\n", text)
    fmt.Printf("Base64 encoded: %s\n", encoded)
    fmt.Printf("Input SHA256: %s\n", inputHash)
    fmt.Printf("Output SHA256: %s\n", outputHash)
}

Use Cases:

Common Errors:

HpcrTextEncrypted

Encrypts plain text using the Hyper Protect encryption format.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrTextEncrypted(plainText, confidentialComputingOs, encryptionCertificate string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
plainText string Required Text to encrypt
confidentialComputingOs string Optional Platform: "ccrt", "ccrv", or "ccco" (defaults to "ccrt" if empty)
encryptionCertificate string Optional PEM certificate (uses latest CCRT as default if empty)

Returns:

Return Type Description
Encrypted Data string Format: hyper-protect-basic.<password>.<data>
Input Checksum string SHA256 of original text
Output Checksum string SHA256 of encrypted output
Error error Error if encryption fails

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    text := "sensitive data"

    // Use default certificate
    encrypted, inputHash, outputHash, err := contract.HpcrTextEncrypted(text, "ccrt", "")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Encrypted: %s\n", encrypted)
    fmt.Printf("Input checksum: %s\n", inputHash)
    fmt.Printf("Output checksum: %s\n", outputHash)
}

Common Errors:

HpcrContractSign

Generates Signed contract from the input contract

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrContractSign(contract, privateKey, password string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
contract string Required Contract to sign
privateKey string Required RSA private key (PEM format) for signing
password string Optional Password for encrypted private key (empty string if private key is not encrypted)

Returns:

Return Type Description
Signed Contract string YAML with workload, env, and envWorkloadSignature
Input Checksum string SHA256 of original contract
Output Checksum string SHA256 of final contract
Error error Error if text is empty

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `
env: hyper-protect-basic.fdsiufhaogdhup.idsvoijsndojvpnsv
workload: hyper-protect-basic.jriewcbdpoiew.diewuphfwhfep
`
    privateKey := `-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----`

    // Generates signed contract (no password for unencrypted key)
    signedContract, inputHash, outputHash, err := contract.HpcrContractSign(contractYAML, privateKey, "")
    if err != nil {
        log.Fatalf("Contract Signature creation failed: %v", err)
    }

    fmt.Printf("Signed Contract: %s\n", signedContract)
    fmt.Printf("Input checksum: %s\n", inputHash)
    fmt.Printf("Output checksum: %s\n", outputHash)
}

Validated Fields:

Common Errors:

HpcrContractTemplate

Returns built-in contract template content for workload, env, or both as a combined YAML scaffold.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrContractTemplate(templateType string) (string, error)

Parameters:

Parameter Type Required/Optional Description
templateType string Optional Template selector: "workload", "env", or "" (returns combined output)

Returns:

Return Type Description
Template Content string YAML template content from contract/template/workload.yaml, contract/template/env.yaml, or both
Error error Error if template type is invalid or template files cannot be read

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    workloadTemplate, err := contract.HpcrContractTemplate("workload")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Workload template:\n%s\n", workloadTemplate)

    envTemplate, err := contract.HpcrContractTemplate("env")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Env template:\n%s\n", envTemplate)

    combinedTemplate, err := contract.HpcrContractTemplate("")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Combined template:\n%s\n", combinedTemplate)
}

Combined Output Format (templateType == ""):

workload: |
  ...content of workload.yaml...
env: |
  ...content of env.yaml...

Common Errors:

HpcrJson

Generates Base64-encoded representation of JSON data with integrity checksums.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrJson(plainJson string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
plainJson string Required Valid JSON string

Returns:

Return Type Description
Base64 Data string Base64-encoded JSON
Input Checksum string SHA256 of original JSON
Output Checksum string SHA256 of Base64 data
Error error Error if not valid JSON

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    jsonData := `{"name": "app", "version": "1.0"}`

    encoded, inputHash, outputHash, err := contract.HpcrJson(jsonData)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Base64 JSON: %s\n", encoded)
    fmt.Printf("Input SHA256: %s\n", inputHash)
    fmt.Printf("Output SHA256: %s\n", outputHash)
}

Common Errors:

HpcrTextDecrypted

Decrypts the data encrypted using Hyper Protect encrypted format

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrTextDecrypted(encryptedText, privateKey, password string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
encryptedText string Required Text to decrypt
privateKey string Required Private key to decrypt the text
password string Optional Password for encrypted private key (empty string if private key is not encrypted)

Returns:

Return Type Description
decrypted Data string Decrypt text in format hyper-protect-basic.<password>.<data>
Input Checksum string SHA256 of encrypted text
Output Checksum string SHA256 of decrypted output
Error error Error if decryption fails

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    text := "sensitive data"
    cert := "....your certificate..."
    privateKey := "...your private key..."

    // Use default certificate
    encrypted, _, _, err := contract.HpcrTextEncrypted(text, "", cert)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Encrypted: %s\n", encrypted)

    // Decrypt with unencrypted private key
    decrypted, inputHash, outputHash, err := contract.HpcrTextDecrypted(encrypted, privateKey, "")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Decrypted: %s\n", decrypted)
    fmt.Printf("Input checksum: %s\n", inputHash)
    fmt.Printf("Output checksum: %s\n", outputHash)
}

Common Errors:

HpcrJsonEncrypted

Encrypts JSON data using the Hyper Protect encryption format.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrJsonEncrypted(plainJson, confidentialComputingOs, encryptionCertificate string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
plainJson string Required Valid JSON string to encrypt
confidentialComputingOs string Optional Platform: "ccrt", "ccrv", or "ccco" (defaults to "ccrt" if empty)
encryptionCertificate string Optional PEM certificate (uses latest CCRT as default if empty)

Returns:

Return Type Description
Encrypted JSON string Format: hyper-protect-basic.<password>.<data>
Input Checksum string SHA256 of original JSON
Output Checksum string SHA256 of encrypted output
Error error Error if not valid JSON or encryption fails

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    config := `{
        "database": {
            "host": "localhost",
            "password": "secret123"
        }
    }`

    encrypted, _, _, err := contract.HpcrJsonEncrypted(config, "ccrt", "")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Encrypted config: %s\n", encrypted)
}

Common Errors:

HpcrTgz

Creates a Base64-encoded TGZ archive from a directory containing docker-compose.yaml or pods.yaml.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrTgz(folderPath string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
folderPath string Required Path to folder containing compose/pods files

Returns:

Return Type Description
TGZ Base64 string Base64-encoded tar.gz archive
Input Checksum string SHA256 of folder path
Output Checksum string SHA256 of Base64 TGZ
Error error Error if folder doesn’t exist or archive creation fails

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    // Folder containing docker-compose.yaml
    folderPath := "./compose"

    tgzBase64, inputHash, outputHash, err := contract.HpcrTgz(folderPath)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("TGZ Base64 (first 100 chars): %s...\n", tgzBase64[:100])
    fmt.Printf("Input SHA256: %s\n", inputHash)
    fmt.Printf("Output SHA256: %s\n", outputHash)
}

Supported Files:

Common Errors:

HpcrTgzEncrypted

Creates an encrypted Base64 TGZ archive from a directory.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrTgzEncrypted(folderPath, confidentialComputingOs, encryptionCertificate string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
folderPath string Required Path to folder with compose/pods files
confidentialComputingOs string Optional Platform: "ccrt", "ccrv", or "ccco" (defaults to "ccrt" if empty)
encryptionCertificate string Optional PEM certificate (uses latest CCRT as default if empty)

Returns:

Return Type Description
Encrypted TGZ string Format: hyper-protect-basic.<password>.<data>
Input Checksum string SHA256 of folder path
Output Checksum string SHA256 of encrypted output
Error error Error if folder invalid or encryption fails

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    encrypted, _, _, err := contract.HpcrTgzEncrypted("./compose", "ccrt", "")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Encrypted TGZ: %s\n", encrypted)
}

Common Errors:

HpcrVerifyContract

Validates a contract against the JSON schema for the specified Hyper Protect platform.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrVerifyContract(contract, version string) error

Parameters:

Parameter Type Required/Optional Description
contract string Required YAML contract to validate
version string Optional Platform: "ccrt", "ccrv", or "ccco" (defaults to "ccrt" if empty)

Returns:

Return Type Description
Error error nil if valid, error with validation details if invalid

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `
env: |
  type: env
  logging:
    logRouter:
      hostname: 5c2d6b69-c7f0-41bd-b69b-240695369d6e.ingress.us-south.logs.cloud.ibm.com
      iamApiKey: ab00e3c09p1d4ff7fff9f04c12183413
workload: |
  type: workload
  compose:
    archive: ZGF0YQ==
`

    // Validate for CCRT
    err := contract.HpcrVerifyContract(contractYAML, "ccrt")
    if err != nil {
        log.Fatalf("Contract validation failed: %v", err)
    }

    fmt.Println("Contract is valid!")
}

Validated Fields:

Common Errors:

HpcrContractSignedEncrypted

Generates a signed and encrypted contract ready for deployment to Hyper Protect services.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrContractSignedEncrypted(contract, confidentialComputingOs, encryptionCertificate, privateKey, password string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
contract string Required YAML contract with env and workload sections
confidentialComputingOs string Optional Platform: "ccrt", "ccrv", or "ccco" (defaults to "ccrt" if empty)
encryptionCertificate string Optional PEM certificate (uses latest CCRT as default if empty)
privateKey string Required RSA private key (PEM format) for signing
password string Optional Password for encrypted private key (empty string if private key is not encrypted)

Returns:

Return Type Description
Signed Contract string YAML with encrypted workload, env, and envWorkloadSignature
Input Checksum string SHA256 of original contract
Output Checksum string SHA256 of final contract
Error error Error if validation or signing fails

Example:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `
env: |
  type: env
  logging:
    logRouter:
      hostname: 5c2d6b69-c7f0-41bd-b69b-240695369d6e.ingress.us-south.logs.cloud.ibm.com
      iamApiKey: ab00e3c09p1d4ff7fff9f04c12183413
workload: |
  type: workload
  compose:
    archive: ZGF0YQ==
`

    privateKey := `-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----`

    signedContract, inputHash, outputHash, err := contract.HpcrContractSignedEncrypted(
        contractYAML,
        "ccrt",
        "",         // Use default certificate
        privateKey,
        "",         // No password for unencrypted key
    )
    if err != nil {
        log.Fatalf("Failed to generate contract: %v", err)
    }

    fmt.Printf("Signed Contract:\n%s\n", signedContract)
    fmt.Printf("Input SHA256: %s\n", inputHash)
    fmt.Printf("Output SHA256: %s\n", outputHash)
}

Example - with attestation public key

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `
env: |
  type: env
  logging:
    logRouter:
      hostname: 5c2d6b69-c7f0-41bd-b69b-240695369d6e.ingress.us-south.logs.cloud.ibm.com
      iamApiKey: ab00e3c09p1d4ff7fff9f04c12183413
workload: |
  type: workload
  compose:
    archive: ZGF0YQ==
attestationPublicKey: 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
`

    privateKey := `-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA...
-----END RSA PRIVATE KEY-----`

    signedContract, inputHash, outputHash, err := contract.HpcrContractSignedEncrypted(
        contractYAML,
        "ccrt",
        "",         // Use default certificate
        privateKey,
    )
    if err != nil {
        log.Fatalf("Failed to generate contract: %v", err)
    }

    fmt.Printf("Signed Contract:\n%s\n", signedContract)
    fmt.Printf("Input SHA256: %s\n", inputHash)
    fmt.Printf("Output SHA256: %s\n", outputHash)
}

Process Flow:

  1. Validates contract schema
  2. Generates public key from private key
  3. Encrypts workload section
  4. Injects signing key into env section
  5. Encrypts env section
  6. Signs encrypted sections with private key
  7. Returns YAML with workload, env, and envWorkloadSignature

Common Errors:

HpcrContractSignedEncryptedContractExpiry

Generates a signed and encrypted contract with time-based expiration using certificate authorities.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpcrContractSignedEncryptedContractExpiry(contract, confidentialComputingOs, encryptionCertificate, privateKey, password, cacert, caKey, csrDataStr, csrPemData string, expiryDays int) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
contract string Required YAML contract
confidentialComputingOs string Optional Platform: "ccrt", "ccrv", or "ccco" (defaults to "ccrt" if empty)
encryptionCertificate string Optional PEM certificate (uses latest CCRT as default if empty)
privateKey string Required RSA private key for signing
password string Optional Password for encrypted private key (empty string if private key is not encrypted)
cacert string Required CA certificate (PEM format)
caKey string Required CA private key (PEM format)
csrDataStr string Conditionally Required* CSR parameters as JSON (use if not providing PEM)
csrPemData string Conditionally Required* CSR in PEM format (use if not providing JSON)
expiryDays int Required Number of days until contract expires

Note: Either csrDataStr OR csrPemData must be provided, not both.

CSR Parameters JSON Format:

{
  "country": "US",
  "state": "California",
  "location": "San Francisco",
  "org": "MyOrganization",
  "unit": "Engineering",
  "domain": "example.com",
  "mail": "admin@example.com"
}

Returns:

Return Type Description
Signed Contract string Contract with time-limited signature
Input Checksum string SHA256 of original contract
Output Checksum string SHA256 of final contract
Error error Error if validation or signing fails

Example - Using CSR Parameters:

package main

import (
    "encoding/json"
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `...your contract...`
    privateKey := `...your RSA private key...`
    caCert := `...your CA certificate...`
    caKey := `...your CA private key...`

    // Define CSR parameters
    csrParams := map[string]interface{}{
        "country":  "US",
        "state":    "California",
        "location": "San Francisco",
        "org":      "MyOrg",
        "unit":     "DevOps",
        "domain":   "myapp.example.com",
        "mail":     "admin@example.com",
    }

    csrJSON, err := json.Marshal(csrParams)
    if err != nil {
        log.Fatal(err)
    }

    // Generate contract that expires in 90 days
    signedContract, _, _, err := contract.HpcrContractSignedEncryptedContractExpiry(
        contractYAML,
        "ccrt",
        "",                // Default encryption cert
        privateKey,
        "",                // No password for unencrypted key
        caCert,
        caKey,
        string(csrJSON),   // CSR parameters
        "",                // No CSR PEM file
        90,                // Expires in 90 days
    )
    if err != nil {
        log.Fatalf("Contract generation failed: %v", err)
    }

    fmt.Printf("Contract with 90-day expiry generated!\n")
    fmt.Printf("%s\n", signedContract)
}

Example - Using CSR PEM:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    // Read CSR PEM file
    csrPEM, err := os.ReadFile("request.csr")
    if err != nil {
        log.Fatal(err)
    }

    contractYAML := `...your contract...`
    privateKey := `...your private key...`
    caCert := `...your CA cert...`
    caKey := `...your CA key...`

    signedContract, _, _, err := contract.HpcrContractSignedEncryptedContractExpiry(
        contractYAML,
        "ccrt",
        "",
        privateKey,
        caCert,
        caKey,
        "",                 // No CSR parameters
        string(csrPEM),     // CSR PEM file
        365,                // 1 year expiry
    )
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Contract generated with 1-year expiry!\n")
}

Use Cases:

Security Considerations:

Common Errors:

HpccInitdata

Generates gzipped and encoded initdata string.

Package: github.com/ibm-hyper-protect/contract-go/v2/contract

Signature:

func HpccInitdata(contract string) (string, string, string, error)

Parameters:

Parameter Type Required/Optional Description
contract string Required Yaml contract

Returns:

Return Type Description
Gzipped & Encoded String string Initdata String gzipped and encoded
Input Checksum string SHA256 of original contract
Output Checksum string SHA256 of gzipped & encoded initdata string
Error error Error if validation, zipping or encoding fails

Example:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `...your contract...`

    encodedString, _, _, err := contract.HpccInitdata(
       contractYAML
    )
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Gzipped & Encoded initdata string is generated!\n")
}

Supported Platforms:

Common Errors:

HpcrVerifyNetworkConfig

Validates network configuration schema for on-premise deployments of HPVS and HPCR RHVS.

Package: github.com/ibm-hyper-protect/contract-go/v2/network

Signature:

func HpcrVerifyNetworkConfig(networkConfig string) error

Parameters:

Parameter Type Required/Optional Description
networkConfig string Required Network configuration in YAML format

Returns:

Return Type Description
Error error nil if valid, error with details if invalid

Example:

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/ibm-hyper-protect/contract-go/v2/network"
)

func main() {
    // Read network config file
    configData, err := os.ReadFile("network-config.yaml")
    if err != nil {
        log.Fatal(err)
    }

    // Validate schema
    err = network.HpcrVerifyNetworkConfig(string(configData))
    if err != nil {
        log.Fatalf("Invalid network config: %v", err)
    }

    fmt.Println("Network configuration is valid!")
}

Supported Platforms:

Common Errors:

Common Patterns

Pattern 1: Complete Contract Workflow

Generate and deploy a signed, encrypted contract for HPVS:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/certificate"
    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    // 1. Download encryption certificates
    versions := []string{"1.1.14", "1.1.15"}
    certsJSON, err := certificate.HpcrDownloadEncryptionCertificates(versions, "json", "")
    if err != nil {
        log.Fatal(err)
    }

    // 2. Get specific version certificate
    version, cert, _, _, _, err := certificate.HpcrGetEncryptionCertificateFromJson(certsJSON, "1.1.15")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Using certificate version: %s\n", version)

    // 3. Define your contract
    contractYAML := `
env: |
  type: env
  logging:
    logRouter:
      hostname: 5c2d6b69-c7f0-41bd-b69b-240695369d6e.ingress.us-south.logs.cloud.ibm.com
      iamApiKey: ab00e3c09p1d4ff7fff9f04c12183413
workload: |
  type: workload
  compose:
    archive: your-archive
`

    // 4. Validate contract
    err = contract.HpcrVerifyContract(contractYAML, "ccrt")
    if err != nil {
        log.Fatalf("Contract validation failed: %v", err)
    }

    // 5. Generate signed and encrypted contract
    privateKey := `-----BEGIN RSA PRIVATE KEY-----
...your private key...
-----END RSA PRIVATE KEY-----`

    signedContract, inputHash, outputHash, err := contract.HpcrContractSignedEncrypted(
        contractYAML,
        "ccrt",
        cert,
        privateKey,
    )
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Contract generated successfully!\n")
    fmt.Printf("Input SHA256: %s\n", inputHash)
    fmt.Printf("Output SHA256: %s\n", outputHash)
    fmt.Printf("Signed Contract: %s\n", signedContract)
}

Pattern 2: Image Selection with Version Constraints

Select the latest compatible HPCR image:

package main

import (
    "encoding/json"
    "fmt"
    "log"
    "os/exec"

    "github.com/ibm-hyper-protect/contract-go/v2/image"
)

func main() {
    // Get images from IBM Cloud CLI
    cmd := exec.Command("ibmcloud", "is", "images", "--json")
    output, err := cmd.Output()
    if err != nil {
        log.Fatal(err)
    }

    // Select latest image with version >= 1.1.0
    imageID, imageName, checksum, version, err := image.HpcrSelectImage(
        string(output),
        ">=1.1.0",
    )
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Selected Image:\n")
    fmt.Printf("  ID: %s\n", imageID)
    fmt.Printf("  Name: %s\n", imageName)
    fmt.Printf("  Version: %s\n", version)
    fmt.Printf("  Checksum: %s\n", checksum)
}

Pattern 3: Working with Contract Expiry

Generate a contract with expiration:

package main

import (
    "encoding/json"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    contractYAML := `...your contract...`
    privateKey := `...your private key...`
    caCert := `...your CA certificate...`
    caKey := `...your CA key...`

    // CSR parameters
    csrParams := map[string]interface{}{
        "country":  "US",
        "state":    "California",
        "location": "San Francisco",
        "org":      "MyOrg",
        "unit":     "Engineering",
        "domain":   "example.com",
        "mail":     "admin@example.com",
    }

    csrJSON, _ := json.Marshal(csrParams)

    // Generate contract with 90-day expiry
    signedContract, inputHash, outputHash, err := contract.HpcrContractSignedEncryptedContractExpiry(
        contractYAML,
        "ccrt",
        "",           // Use default encryption cert
        privateKey,
        caCert,
        caKey,
        string(csrJSON),
        "",           // Not using CSR PEM file
        90,           // Expire in 90 days
    )
    if err != nil {
        log.Fatal(err)
    }

    // Use the contract...
}

Pattern 4: Encrypting Workload Data

Encrypt different types of data for contracts:

package main

import (
    "fmt"
    "log"

    "github.com/ibm-hyper-protect/contract-go/v2/contract"
)

func main() {
    // Encrypt plain text
    text := "Hello, Hyper Protect!"
    encText, _, _, err := contract.HpcrTextEncrypted(text, "ccrt", "")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Encrypted text: %s\n", encText)

    // Encrypt JSON
    jsonData := `{"key": "value", "number": 42}`
    encJSON, _, _, err := contract.HpcrJsonEncrypted(jsonData, "ccrt", "")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Encrypted JSON: %s\n", encJSON)

    // Encrypt TGZ archive
    encTGZ, _, _, err := contract.HpcrTgzEncrypted("/path/to/compose/folder", "ccrt", "")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Encrypted TGZ: %s\n", encTGZ)
}

Error Handling

Common Error Messages

Error Message Cause Solution
"required parameter is empty" Missing required parameter Ensure all required parameters are provided
"required parameter is missing" Missing required parameter Ensure all required parameters are provided
"not a JSON data" Invalid JSON format Verify JSON syntax
"contract is not a JSON data" Contract is not valid JSON Check contract format
"openssl not found" OpenSSL not installed or not in PATH Install OpenSSL or set OPENSSL_BIN
"schema verification failed" Contract doesn’t match schema Review contract structure against schema
"failed to decrypt password" Invalid private key or corrupted data Verify private key matches public key
"failed to encrypt key" Encryption operation failed Check certificate validity
"folder doesn't exists" Path not found Verify folder path exists
"no Hyper Protect image matching version found" No images match version constraint Adjust version constraint or check available images

Best Practices for Error Handling

  1. Always Check Errors: 
    result, err := contract.HpcrText("data")
if err != nil {
 log.Fatalf("Operation failed: %v", err)
}
  2. Wrap Errors with Context: 
    signedContract, _, _, err := contract.HpcrContractSignedEncrypted(...)
if err != nil {
 return fmt.Errorf("failed to generate signed contract: %w", err)
}
  3. Validate Input Before Processing: ```go // Validate contract schema before encryption err := contract.HpcrVerifyContract(contractYAML, “ccrt”) if err != nil { return fmt.Errorf(“invalid contract: %w”, err) }

// Now proceed with encryption signedContract, _, _, err := contract.HpcrContractSignedEncrypted(…)


4. **Use Checksums for Verification:**
```go
encrypted, inputHash, outputHash, err := contract.HpcrTextEncrypted(data, "ccrt", "")
if err != nil {
    return err
}

// Store checksums for later verification
fmt.Printf("Input checksum: %s\n", inputHash)
fmt.Printf("Output checksum: %s\n", outputHash)

Platform-Specific Constants

The library supports three IBM Confidential Computing platforms:

const (
    ConfidentialComputingOsCcrt     = "ccrt"         // IBM Confidential Computing Container Runtime (CCRT)
    ConfidentialComputingOsCcrv = "ccrv"    // IBM Confidential Computing Container Runtime for Red Hat Virtualization Solutions (CCRV)
    ConfidentialComputingConfidentialContainerCcco = "ccco" // IBM Confidential Computing Containers for Red Hat OpenShift Container Platform (CCCO)
)

Use these constants when calling functions that require a platform specification:

import "github.com/ibm-hyper-protect/contract-go/v2/common/general"

// Example usage
contract.HpcrContractSignedEncrypted(
    contractYAML,
    general.ConfidentialComputingOsCcrt,  // or "ccrt"
    cert,
    privateKey,
)

Additional Resources

IBM Confidential Computing Documentation

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