diff --git a/claims.go b/claims.go
new file mode 100644
index 0000000..a9bc533
--- /dev/null
+++ b/claims.go
@@ -0,0 +1,193 @@
+package jwt
+
+import "crypto/subtle"
+
+// For a type to be a Claims object, it must just have a Valid method that determines
+// if the token is invalid for any supported reason
+type Claims interface {
+	Valid() error
+}
+
+// Structured version of Claims Section, as referenced at
+// https://tools.ietf.org/html/rfc7519#section-4.1
+type StandardClaims struct {
+	Audience  string `json:"aud,omitempty"`
+	ExpiresAt int64  `json:"exp,omitempty"`
+	Id        string `json:"jti,omitempty"`
+	IssuedAt  int64  `json:"iat,omitempty"`
+	Issuer    string `json:"iss,omitempty"`
+	NotBefore int64  `json:"nbf,omitempty"`
+	Subject   string `json:"sub,omitempty"`
+}
+
+// Validates time based claims "exp, iat, nbf".
+// There is no accounting for clock skew.
+// As well, if any of the above claims are not in the token, it will still
+// be considered a valid claim.
+func (c StandardClaims) Valid() error {
+	vErr := new(ValidationError)
+	now := TimeFunc().Unix()
+
+	// The claims below are optional, by default, so if they are set to the
+	// default value in Go, let's not fail the verification for them.
+	if c.VerifyExpiresAt(now, false) == false {
+		vErr.err = "Token is expired"
+		vErr.Errors |= ValidationErrorExpired
+	}
+
+	if c.VerifyIssuedAt(now, false) == false {
+		vErr.err = "Token used before issued, clock skew issue?"
+		vErr.Errors |= ValidationErrorIssuedAt
+	}
+
+	if c.VerifyNotBefore(now, false) == false {
+		vErr.err = "Token is not valid yet"
+		vErr.Errors |= ValidationErrorNotValidYet
+	}
+
+	if vErr.valid() {
+		return nil
+	}
+
+	return vErr
+}
+
+// Compares the aud claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
+	return verifyAud(c.Audience, cmp, req)
+}
+
+// Compares the exp claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool) bool {
+	return verifyExp(c.ExpiresAt, cmp, req)
+}
+
+// Compares the iat claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (c *StandardClaims) VerifyIssuedAt(cmp int64, req bool) bool {
+	return verifyIat(c.IssuedAt, cmp, req)
+}
+
+// Compares the iss claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (c *StandardClaims) VerifyIssuer(cmp string, req bool) bool {
+	return verifyIss(c.Issuer, cmp, req)
+}
+
+// Compares the nbf claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool) bool {
+	return verifyNbf(c.NotBefore, cmp, req)
+}
+
+type MapClaim map[string]interface{}
+
+// Compares the aud claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (m MapClaim) VerifyAudience(cmp string, req bool) bool {
+	aud, _ := m["aud"].(string)
+	return verifyAud(aud, cmp, req)
+}
+
+// Compares the exp claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (m MapClaim) VerifyExpiresAt(cmp int64, req bool) bool {
+	exp, _ := m["exp"].(float64)
+	return verifyExp(int64(exp), cmp, req)
+}
+
+// Compares the iat claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (m MapClaim) VerifyIssuedAt(cmp int64, req bool) bool {
+	iat, _ := m["iat"].(float64)
+	return verifyIat(int64(iat), cmp, req)
+}
+
+// Compares the iss claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (m MapClaim) VerifyIssuer(cmp string, req bool) bool {
+	iss, _ := m["iss"].(string)
+	return verifyIss(iss, cmp, req)
+}
+
+// Compares the nbf claim against cmp.
+// If required is false, this method will return true if the value matches or is unset
+func (m MapClaim) VerifyNotBefore(cmp int64, req bool) bool {
+	nbf, _ := m["nbf"].(float64)
+	return verifyNbf(int64(nbf), cmp, req)
+}
+
+// Validates time based claims "exp, iat, nbf".
+// There is no accounting for clock skew.
+// As well, if any of the above claims are not in the token, it will still
+// be considered a valid claim.
+func (m MapClaim) Valid() error {
+	vErr := new(ValidationError)
+	now := TimeFunc().Unix()
+
+	if m.VerifyExpiresAt(now, false) == false {
+		vErr.err = "Token is expired"
+		vErr.Errors |= ValidationErrorExpired
+	}
+
+	if m.VerifyIssuedAt(now, false) == false {
+		vErr.err = "Token used before issued, clock skew issue?"
+		vErr.Errors |= ValidationErrorIssuedAt
+	}
+
+	if m.VerifyNotBefore(now, false) == false {
+		vErr.err = "Token is not valid yet"
+		vErr.Errors |= ValidationErrorNotValidYet
+	}
+
+	if vErr.valid() {
+		return nil
+	}
+
+	return vErr
+}
+
+func verifyAud(aud string, cmp string, required bool) bool {
+	if aud == "" {
+		return !required
+	}
+	if subtle.ConstantTimeCompare([]byte(aud), []byte(cmp)) != 0 {
+		return true
+	} else {
+		return false
+	}
+}
+
+func verifyExp(exp int64, now int64, required bool) bool {
+	if exp == 0 {
+		return !required
+	}
+	return now <= exp
+}
+
+func verifyIat(iat int64, now int64, required bool) bool {
+	if iat == 0 {
+		return !required
+	}
+	return now >= iat
+}
+
+func verifyIss(iss string, cmp string, required bool) bool {
+	if iss == "" {
+		return !required
+	}
+	if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
+		return true
+	} else {
+		return false
+	}
+}
+
+func verifyNbf(nbf int64, now int64, required bool) bool {
+	if nbf == 0 {
+		return !required
+	}
+	return now >= nbf
+}
diff --git a/jwt.go b/jwt.go
index 53972c3..cfe2d6b 100644
--- a/jwt.go
+++ b/jwt.go
@@ -1,7 +1,6 @@
 package jwt
 
 import (
-	"crypto/subtle"
 	"encoding/base64"
 	"encoding/json"
 	"net/http"
@@ -20,196 +19,6 @@ var TimeFunc = time.Now
 // Header of the token (such as `kid`) to identify which key to use.
 type Keyfunc func(*Token) (interface{}, error)
 
-// For a type to be a Claims object, it must just have a Valid method that determines
-// if the token is invalid for any supported reason
-type Claims interface {
-	Valid() error
-}
-
-// Structured version of Claims Section, as referenced at
-// https://tools.ietf.org/html/rfc7519#section-4.1
-type StandardClaims struct {
-	Audience  string `json:"aud,omitempty"`
-	ExpiresAt int64  `json:"exp,omitempty"`
-	Id        string `json:"jti,omitempty"`
-	IssuedAt  int64  `json:"iat,omitempty"`
-	Issuer    string `json:"iss,omitempty"`
-	NotBefore int64  `json:"nbf,omitempty"`
-	Subject   string `json:"sub,omitempty"`
-}
-
-// Validates time based claims "exp, iat, nbf".
-// There is no accounting for clock skew.
-// As well, if any of the above claims are not in the token, it will still
-// be considered a valid claim.
-func (c StandardClaims) Valid() error {
-	vErr := new(ValidationError)
-	now := TimeFunc().Unix()
-
-	// The claims below are optional, by default, so if they are set to the
-	// default value in Go, let's not fail the verification for them.
-	if c.VerifyExpiresAt(now, false) == false {
-		vErr.err = "Token is expired"
-		vErr.Errors |= ValidationErrorExpired
-	}
-
-	if c.VerifyIssuedAt(now, false) == false {
-		vErr.err = "Token used before issued, clock skew issue?"
-		vErr.Errors |= ValidationErrorIssuedAt
-	}
-
-	if c.VerifyNotBefore(now, false) == false {
-		vErr.err = "Token is not valid yet"
-		vErr.Errors |= ValidationErrorNotValidYet
-	}
-
-	if vErr.valid() {
-		return nil
-	}
-
-	return vErr
-}
-
-// Compares the aud claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
-	return verifyAud(c.Audience, cmp, req)
-}
-
-// Compares the exp claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool) bool {
-	return verifyExp(c.ExpiresAt, cmp, req)
-}
-
-// Compares the iat claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (c *StandardClaims) VerifyIssuedAt(cmp int64, req bool) bool {
-	return verifyIat(c.IssuedAt, cmp, req)
-}
-
-// Compares the iss claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (c *StandardClaims) VerifyIssuer(cmp string, req bool) bool {
-	return verifyIss(c.Issuer, cmp, req)
-}
-
-// Compares the nbf claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool) bool {
-	return verifyNbf(c.NotBefore, cmp, req)
-}
-
-type MapClaim map[string]interface{}
-
-// Compares the aud claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (m MapClaim) VerifyAudience(cmp string, req bool) bool {
-	aud, _ := m["aud"].(string)
-	return verifyAud(aud, cmp, req)
-}
-
-// Compares the exp claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (m MapClaim) VerifyExpiresAt(cmp int64, req bool) bool {
-	exp, _ := m["exp"].(float64)
-	return verifyExp(int64(exp), cmp, req)
-}
-
-// Compares the iat claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (m MapClaim) VerifyIssuedAt(cmp int64, req bool) bool {
-	iat, _ := m["iat"].(float64)
-	return verifyIat(int64(iat), cmp, req)
-}
-
-// Compares the iss claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (m MapClaim) VerifyIssuer(cmp string, req bool) bool {
-	iss, _ := m["iss"].(string)
-	return verifyIss(iss, cmp, req)
-}
-
-// Compares the nbf claim against cmp.
-// If required is false, this method will return true if the value matches or is unset
-func (m MapClaim) VerifyNotBefore(cmp int64, req bool) bool {
-	nbf, _ := m["nbf"].(float64)
-	return verifyNbf(int64(nbf), cmp, req)
-}
-
-// Validates time based claims "exp, iat, nbf".
-// There is no accounting for clock skew.
-// As well, if any of the above claims are not in the token, it will still
-// be considered a valid claim.
-func (m MapClaim) Valid() error {
-	vErr := new(ValidationError)
-	now := TimeFunc().Unix()
-
-	if m.VerifyExpiresAt(now, false) == false {
-		vErr.err = "Token is expired"
-		vErr.Errors |= ValidationErrorExpired
-	}
-
-	if m.VerifyIssuedAt(now, false) == false {
-		vErr.err = "Token used before issued, clock skew issue?"
-		vErr.Errors |= ValidationErrorIssuedAt
-	}
-
-	if m.VerifyNotBefore(now, false) == false {
-		vErr.err = "Token is not valid yet"
-		vErr.Errors |= ValidationErrorNotValidYet
-	}
-
-	if vErr.valid() {
-		return nil
-	}
-
-	return vErr
-}
-
-func verifyAud(aud string, cmp string, required bool) bool {
-	if aud == "" {
-		return !required
-	}
-	if subtle.ConstantTimeCompare([]byte(aud), []byte(cmp)) != 0 {
-		return true
-	} else {
-		return false
-	}
-}
-
-func verifyExp(exp int64, now int64, required bool) bool {
-	if exp == 0 {
-		return !required
-	}
-	return now <= exp
-}
-
-func verifyIat(iat int64, now int64, required bool) bool {
-	if iat == 0 {
-		return !required
-	}
-	return now >= iat
-}
-
-func verifyIss(iss string, cmp string, required bool) bool {
-	if iss == "" {
-		return !required
-	}
-	if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
-		return true
-	} else {
-		return false
-	}
-}
-
-func verifyNbf(nbf int64, now int64, required bool) bool {
-	if nbf == 0 {
-		return !required
-	}
-	return now >= nbf
-}
-
 // A JWT Token.  Different fields will be used depending on whether you're
 // creating or parsing/verifying a token.
 type Token struct {