# OpenSSL

- Introduction
- Installing/Configuring
  - Requirements
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
  - Purpose checking flags
  - Padding flags for asymmetric encryption
  - Key types
  - PKCS7 Flags/Constants
  - Signature Algorithms
  - Ciphers
  - Version constants
  - Server Name Indication constants
  - Other Constants
- Key/Certificate parameters
- Certificate Verification
- OpenSSL Functions
  - openssl_cipher_iv_length — Gets the cipher iv length
  - openssl_csr_export_to_file — Exports a CSR to a file
  - openssl_csr_export — Exports a CSR as a string
  - openssl_csr_get_public_key — Returns the public key of a CSR
  - openssl_csr_get_subject — Returns the subject of a CSR
  - openssl_csr_new — Generates a CSR
  - openssl_csr_sign — Sign a CSR with another certificate (or itself) and generate a certificate
  - openssl_decrypt — Decrypts data
  - openssl_dh_compute_key — Computes shared secret for public value of remote DH public key and local DH key
  - openssl_digest — Computes a digest
  - openssl_encrypt — Encrypts data
  - openssl_error_string — Return openSSL error message
  - openssl_free_key — Free key resource
  - openssl_get_cert_locations — Retrieve the available certificate locations
  - openssl_get_cipher_methods — Gets available cipher methods
  - openssl_get_curve_names — Gets list of available curve names for ECC
  - openssl_get_md_methods — Gets available digest methods
  - openssl_get_privatekey — Alias of openssl_pkey_get_private
  - openssl_get_publickey — Alias of openssl_pkey_get_public
  - openssl_open — Open sealed data
  - openssl_pbkdf2 — Generates a PKCS5 v2 PBKDF2 string
  - openssl_pkcs12_export_to_file — Exports a PKCS#12 Compatible Certificate Store File
  - openssl_pkcs12_export — Exports a PKCS#12 Compatible Certificate Store File to variable
  - openssl_pkcs12_read — Parse a PKCS#12 Certificate Store into an array
  - openssl_pkcs7_decrypt — Decrypts an S/MIME encrypted message
  - openssl_pkcs7_encrypt — Encrypt an S/MIME message
  - openssl_pkcs7_read — Export the PKCS7 file to an array of PEM certificates
  - openssl_pkcs7_sign — Sign an S/MIME message
  - openssl_pkcs7_verify — Verifies the signature of an S/MIME signed message
  - openssl_pkey_export_to_file — Gets an exportable representation of a key into a file
  - openssl_pkey_export — Gets an exportable representation of a key into a string
  - openssl_pkey_free — Frees a private key
  - openssl_pkey_get_details — Returns an array with the key details
  - openssl_pkey_get_private — Get a private key
  - openssl_pkey_get_public — Extract public key from certificate and prepare it for use
  - openssl_pkey_new — Generates a new private key
  - openssl_private_decrypt — Decrypts data with private key
  - openssl_private_encrypt — Encrypts data with private key
  - openssl_public_decrypt — Decrypts data with public key
  - openssl_public_encrypt — Encrypts data with public key
  - openssl_random_pseudo_bytes — Generate a pseudo-random string of bytes
  - openssl_seal — Seal (encrypt) data
  - openssl_sign — Generate signature
  - openssl_spki_export_challenge — Exports the challenge associated with a signed public key and challenge
  - openssl_spki_export — Exports a valid PEM formatted public key signed public key and challenge
  - openssl_spki_new — Generate a new signed public key and challenge
  - openssl_spki_verify — Verifies a signed public key and challenge
  - openssl_verify — Verify signature
  - openssl_x509_check_private_key — Checks if a private key corresponds to a certificate
  - openssl_x509_checkpurpose — Verifies if a certificate can be used for a particular purpose
  - openssl_x509_export_to_file — Exports a certificate to file
  - openssl_x509_export — Exports a certificate as a string
  - openssl_x509_fingerprint — Calculates the fingerprint, or digest, of a given X.509 certificate
  - openssl_x509_free — Free certificate resource
  - openssl_x509_parse — Parse an X509 certificate and return the information as an array
  - openssl_x509_read — Parse an X.509 certificate and return a resource identifier for it
  - openssl_x509_verify — Verifies digital signature of x509 certificate against a public key