90 lines
2.9 KiB
Go
90 lines
2.9 KiB
Go
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package crypt
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import (
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"crypto/subtle"
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"encoding/base64"
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"fmt"
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"strings"
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core "github.com/host-uk/core/pkg/framework/core"
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"golang.org/x/crypto/argon2"
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"golang.org/x/crypto/bcrypt"
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)
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// HashPassword hashes a password using Argon2id with default parameters.
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// Returns a string in the format: $argon2id$v=19$m=65536,t=3,p=4$<base64salt>$<base64hash>
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func HashPassword(password string) (string, error) {
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salt, err := generateSalt(argon2SaltLen)
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if err != nil {
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return "", core.E("crypt.HashPassword", "failed to generate salt", err)
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}
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hash := argon2.IDKey([]byte(password), salt, argon2Time, argon2Memory, argon2Parallelism, argon2KeyLen)
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b64Salt := base64.RawStdEncoding.EncodeToString(salt)
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b64Hash := base64.RawStdEncoding.EncodeToString(hash)
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encoded := fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version, argon2Memory, argon2Time, argon2Parallelism,
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b64Salt, b64Hash)
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return encoded, nil
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}
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// VerifyPassword verifies a password against an Argon2id hash string.
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// The hash must be in the format produced by HashPassword.
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func VerifyPassword(password, hash string) (bool, error) {
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parts := strings.Split(hash, "$")
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if len(parts) != 6 {
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return false, core.E("crypt.VerifyPassword", "invalid hash format", nil)
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}
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var version int
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if _, err := fmt.Sscanf(parts[2], "v=%d", &version); err != nil {
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return false, core.E("crypt.VerifyPassword", "failed to parse version", err)
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}
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var memory uint32
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var time uint32
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var parallelism uint8
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if _, err := fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &time, ¶llelism); err != nil {
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return false, core.E("crypt.VerifyPassword", "failed to parse parameters", err)
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}
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salt, err := base64.RawStdEncoding.DecodeString(parts[4])
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if err != nil {
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return false, core.E("crypt.VerifyPassword", "failed to decode salt", err)
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}
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expectedHash, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false, core.E("crypt.VerifyPassword", "failed to decode hash", err)
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}
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computedHash := argon2.IDKey([]byte(password), salt, time, memory, parallelism, uint32(len(expectedHash)))
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return subtle.ConstantTimeCompare(computedHash, expectedHash) == 1, nil
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}
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// HashBcrypt hashes a password using bcrypt with the given cost.
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// Cost must be between bcrypt.MinCost and bcrypt.MaxCost.
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func HashBcrypt(password string, cost int) (string, error) {
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hash, err := bcrypt.GenerateFromPassword([]byte(password), cost)
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if err != nil {
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return "", core.E("crypt.HashBcrypt", "failed to hash password", err)
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}
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return string(hash), nil
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}
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// VerifyBcrypt verifies a password against a bcrypt hash.
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func VerifyBcrypt(password, hash string) (bool, error) {
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err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
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if err == bcrypt.ErrMismatchedHashAndPassword {
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return false, nil
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}
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if err != nil {
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return false, core.E("crypt.VerifyBcrypt", "failed to verify password", err)
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}
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return true, nil
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}
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