下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
SODIUM_LIBRARY_VERSION
(string)
SODIUM_LIBRARY_MAJOR_VERSION
(integer)
SODIUM_LIBRARY_MINOR_VERSION
(integer)
SODIUM_CRYPTO_AEAD_AES256GCM_KEYBYTES
(integer)
SODIUM_CRYPTO_AEAD_AES256GCM_NSECBYTES
(integer)
SODIUM_CRYPTO_AEAD_AES256GCM_NPUBBYTES
(integer)
SODIUM_CRYPTO_AEAD_AES256GCM_ABYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NSECBYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_ABYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_KEYBYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NSECBYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES
(integer)
SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES
(integer)
SODIUM_CRYPTO_AUTH_BYTES
(integer)
SODIUM_CRYPTO_AUTH_KEYBYTES
(integer)
SODIUM_CRYPTO_BOX_SEALBYTES
(integer)
SODIUM_CRYPTO_BOX_SECRETKEYBYTES
(integer)
SODIUM_CRYPTO_BOX_PUBLICKEYBYTES
(integer)
SODIUM_CRYPTO_BOX_KEYPAIRBYTES
(integer)
SODIUM_CRYPTO_BOX_MACBYTES
(integer)
SODIUM_CRYPTO_BOX_NONCEBYTES
(integer)
SODIUM_CRYPTO_BOX_SEEDBYTES
(integer)
SODIUM_CRYPTO_KDF_BYTES_MIN
(integer)
SODIUM_CRYPTO_KDF_BYTES_MAX
(integer)
SODIUM_CRYPTO_KDF_CONTEXTBYTES
(integer)
SODIUM_CRYPTO_KDF_KEYBYTES
(integer)
SODIUM_CRYPTO_KX_SEEDBYTES
(integer)
SODIUM_CRYPTO_KX_SESSIONKEYBYTES
(integer)
SODIUM_CRYPTO_KX_PUBLICKEYBYTES
(integer)
SODIUM_CRYPTO_KX_SECRETKEYBYTES
(integer)
SODIUM_CRYPTO_KX_KEYPAIRBYTES
(integer)
SODIUM_CRYPTO_GENERICHASH_BYTES
(integer)
SODIUM_CRYPTO_GENERICHASH_BYTES_MIN
(integer)
SODIUM_CRYPTO_GENERICHASH_BYTES_MAX
(integer)
SODIUM_CRYPTO_GENERICHASH_KEYBYTES
(integer)
SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MIN
(integer)
SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MAX
(integer)
SODIUM_CRYPTO_PWHASH_ALG_ARGON2I13
(integer)
SODIUM_CRYPTO_PWHASH_ALG_DEFAULT
(integer)
SODIUM_CRYPTO_PWHASH_SALTBYTES
(integer)
SODIUM_CRYPTO_PWHASH_STRPREFIX
(string)
SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE
(integer)
SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE
(integer)
SODIUM_CRYPTO_PWHASH_OPSLIMIT_MODERATE
(integer)
SODIUM_CRYPTO_PWHASH_MEMLIMIT_MODERATE
(integer)
SODIUM_CRYPTO_PWHASH_OPSLIMIT_SENSITIVE
(integer)
SODIUM_CRYPTO_PWHASH_MEMLIMIT_SENSITIVE
(integer)
SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES
(integer)
SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_STRPREFIX
(string)
SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_INTERACTIVE
(integer)
SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_INTERACTIVE
(integer)
SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_OPSLIMIT_SENSITIVE
(integer)
SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_MEMLIMIT_SENSITIVE
(integer)
SODIUM_CRYPTO_SCALARMULT_BYTES
(integer)
SODIUM_CRYPTO_SCALARMULT_SCALARBYTES
(integer)
SODIUM_CRYPTO_SHORTHASH_BYTES
(integer)
SODIUM_CRYPTO_SHORTHASH_KEYBYTES
(integer)
SODIUM_CRYPTO_SECRETBOX_KEYBYTES
(integer)
SODIUM_CRYPTO_SECRETBOX_MACBYTES
(integer)
SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
(integer)
SODIUM_CRYPTO_SIGN_BYTES
(integer)
SODIUM_CRYPTO_SIGN_SEEDBYTES
(integer)
SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES
(integer)
SODIUM_CRYPTO_SIGN_SECRETKEYBYTES
(integer)
SODIUM_CRYPTO_SIGN_KEYPAIRBYTES
(integer)
SODIUM_CRYPTO_STREAM_NONCEBYTES
(integer)
SODIUM_CRYPTO_STREAM_KEYBYTES
(integer)