diff options
Diffstat (limited to 'src/main/model/asn1/ASN1Object.java')
| -rw-r--r-- | src/main/model/asn1/ASN1Object.java | 73 |
1 files changed, 40 insertions, 33 deletions
diff --git a/src/main/model/asn1/ASN1Object.java b/src/main/model/asn1/ASN1Object.java index 9b4a98c..434a6c5 100644 --- a/src/main/model/asn1/ASN1Object.java +++ b/src/main/model/asn1/ASN1Object.java @@ -2,14 +2,10 @@ package model.asn1; import model.asn1.exceptions.ParseException; import model.asn1.parsing.BytesReader; -import ui.Utils; -import java.nio.ByteBuffer; import java.util.ArrayList; import java.util.Arrays; import java.util.List; -import java.util.stream.Collectors; -import java.util.stream.Stream; /** * Represents an encode-able ASN.1 object. It can be a SEQUENCE, an INTEGER, an OID, or any other ASN.1 type. @@ -50,9 +46,9 @@ public class ASN1Object implements Encodable { * of the corresponding types. However, applications may use context-specific * or private tags for corresponding fields, either implicitly encoded or explicitly encoded. * REQUIRES: Three cases: - * 1. No context-specific tag: parentTag must be null. - * 2. Implicit encoding: parentTag must be null, and the tag must be CONTEXT_SPECIFIC. - * 3. Explicit encoding: parentTag must be constructive and CONTEXT_SPECIFIC. + * 1. No context-specific tag: parentTag must be null. + * 2. Implicit encoding: parentTag must be null, and the tag must be CONTEXT_SPECIFIC. + * 3. Explicit encoding: parentTag must be constructive and CONTEXT_SPECIFIC. */ public ASN1Object(Tag tag, Tag parentTag) { this.tag = tag; @@ -66,13 +62,13 @@ public class ASN1Object implements Encodable { * and value (length = 0 if no value in DER, but never null). It will fill the value and length but will not mark * the value as read (only the tag will be marked). Subtypes are responsible for deserializing the values. This * method is not appropriate for parsing an unknown input (use subtypes instead) since values will be left unread. - * Throws {@link ParseException} if input is invalid: - * The input data must have a valid - * parentTag (optional) - parentLength (optional) - tag - length - value (optional). - * The value must match the corresponding type (e.g., an INTEGER value cannot go to an OctetString type). - * The value must be supported by the corresponding type (e.g., a Printable must only contain valid chars). - * If parentTag presents, its class must be CONTEXT_SPECIFIC, and it must be constructive. - * If parentLength presents, it must not be 0. + * Throws {@link ParseException} if input is invalid: + * The input data must have a valid + * parentTag (optional) - parentLength (optional) - tag - length - value (optional). + * The value must match the corresponding type (e.g., an INTEGER value cannot go to an OctetString type). + * The value must be supported by the corresponding type (e.g., a Printable must only contain valid chars). + * If parentTag presents, its class must be CONTEXT_SPECIFIC, and it must be constructive. + * If parentLength presents, it must not be 0. * MODIFIES: this, encoded (bytes are read) * REQUIRES: If hasParentTag is true, parentTag and parentLength must present. Otherwise, they must be null. Assumes * that the length won't be lower than actual. Assumes parentLength = length(tag + length + value). @@ -108,23 +104,34 @@ public class ASN1Object implements Encodable { * if unrecognized or application-defined (SEQUENCE or SET). It will always mark anything to be read, including * unrecognized type values. This method is appropriate to decode an unknown input stream into known or unknown * types. All values will be read. - * Throws {@link ParseException} if the input is invalid. + * Throws {@link ParseException} if the input is invalid. * MODIFIES: encoded */ public static ASN1Object parse(BytesReader encoded, boolean hasParentTag) throws ParseException { final Tag t = encoded.getTag(hasParentTag); switch (t.getNumber()) { - case 0x1: return new Bool(encoded, hasParentTag); - case 0x2: return new Int(encoded, hasParentTag); - case 0x3: return new BitString(encoded, hasParentTag); - case 0x4: return new OctetString(encoded, hasParentTag); - case 0x5: return new Null(encoded, hasParentTag); - case 0x6: return new ObjectIdentifier(encoded, hasParentTag); - case 0xC: return new UTF8String(encoded, hasParentTag); - case 0x13: return new PrintableString(encoded, hasParentTag); - case 0x16: return new IA5String(encoded, hasParentTag); - case 0x17: return new UtcTime(encoded, hasParentTag); - case 0x18: return new GeneralizedTime(encoded, hasParentTag); + case 0x1: + return new Bool(encoded, hasParentTag); + case 0x2: + return new Int(encoded, hasParentTag); + case 0x3: + return new BitString(encoded, hasParentTag); + case 0x4: + return new OctetString(encoded, hasParentTag); + case 0x5: + return new Null(encoded, hasParentTag); + case 0x6: + return new ObjectIdentifier(encoded, hasParentTag); + case 0xC: + return new UTF8String(encoded, hasParentTag); + case 0x13: + return new PrintableString(encoded, hasParentTag); + case 0x16: + return new IA5String(encoded, hasParentTag); + case 0x17: + return new UtcTime(encoded, hasParentTag); + case 0x18: + return new GeneralizedTime(encoded, hasParentTag); default: { ASN1Object object = new ASN1Object(encoded, hasParentTag); // Mark as read unconditionally because there aren't any type handlers that read them. @@ -139,16 +146,16 @@ public class ASN1Object implements Encodable { * The encoding will result in: * (Parent Tag)(Tag)(Length)(Value) * Parent Tag - Only exists if the field has a context-specific parent tag number and use explicit tagging. In this - * case, the parent tag is the tag supplied in the constructor. If the field uses implicit tag - * encoding or does not have a context-specific tag number, this field does not exist. This field, - * as specified in the REQUIRES clause in the constructor, is always constructive. + * case, the parent tag is the tag supplied in the constructor. If the field uses implicit tag + * encoding or does not have a context-specific tag number, this field does not exist. This field, + * as specified in the REQUIRES clause in the constructor, is always constructive. * Parent Length - The length of the following (tag, length, and value). A detailed length description, see follows. * Tag - The tag value. * Length - The length of the value, in number of bytes. If the length is <= 127, it will contain only a single - * byte of length value, with the highest bit cleared. If the length is > 127, the first length byte - * will have its highest bit set, with the remaining bits representing how many bytes are needed to - * store the length integer. Followed are the integer, in multiple bytes, representing the length. The - * multibyte integer are encoded in big-endian. + * byte of length value, with the highest bit cleared. If the length is > 127, the first length byte + * will have its highest bit set, with the remaining bits representing how many bytes are needed to + * store the length integer. Followed are the integer, in multiple bytes, representing the length. The + * multibyte integer are encoded in big-endian. * Value - The value, with a total length (in bytes) corresponding to the Length field. * REQUIRES: encodeValueDER() != null */ |