diff options
author | Roberto Tyley <roberto.tyley@gmail.com> | 2014-07-15 01:38:01 +0400 |
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committer | Roberto Tyley <roberto.tyley@gmail.com> | 2014-07-26 11:23:17 +0400 |
commit | 7cb752aaf746dc0b473afeb9e892b7fbc12666c5 (patch) | |
tree | cc4f91ddc18332b5adbe82e3fcb040d976c90105 /core/src/main/java/org/spongycastle/asn1/cms/GCMParameters.java | |
parent | 551830f8ea5177042af2c7dd1fc90888bc67387d (diff) |
Execute become-spongy.sh
https://github.com/rtyley/spongycastle/blob/3040af/become-spongy.sh
Diffstat (limited to 'core/src/main/java/org/spongycastle/asn1/cms/GCMParameters.java')
-rw-r--r-- | core/src/main/java/org/spongycastle/asn1/cms/GCMParameters.java | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/asn1/cms/GCMParameters.java b/core/src/main/java/org/spongycastle/asn1/cms/GCMParameters.java new file mode 100644 index 00000000..131b1899 --- /dev/null +++ b/core/src/main/java/org/spongycastle/asn1/cms/GCMParameters.java @@ -0,0 +1,102 @@ +package org.spongycastle.asn1.cms; + +import org.spongycastle.asn1.ASN1EncodableVector; +import org.spongycastle.asn1.ASN1Integer; +import org.spongycastle.asn1.ASN1Object; +import org.spongycastle.asn1.ASN1OctetString; +import org.spongycastle.asn1.ASN1Primitive; +import org.spongycastle.asn1.ASN1Sequence; +import org.spongycastle.asn1.DEROctetString; +import org.spongycastle.asn1.DERSequence; +import org.spongycastle.util.Arrays; + +/** + * <a href="http://tools.ietf.org/html/rfc5084">RFC 5084</a>: GCMParameters object. + * <p> + * <pre> + GCMParameters ::= SEQUENCE { + aes-nonce OCTET STRING, -- recommended size is 12 octets + aes-ICVlen AES-GCM-ICVlen DEFAULT 12 } + * </pre> + */ +public class GCMParameters + extends ASN1Object +{ + private byte[] nonce; + private int icvLen; + + /** + * Return an GCMParameters object from the given object. + * <p> + * Accepted inputs: + * <ul> + * <li> null → null + * <li> {@link org.spongycastle.asn1.cms.GCMParameters} object + * <li> {@link org.spongycastle.asn1.ASN1Sequence#getInstance(Object) ASN1Sequence} input formats with GCMParameters structure inside + * </ul> + * + * @param obj the object we want converted. + * @exception IllegalArgumentException if the object cannot be converted. + */ + public static GCMParameters getInstance( + Object obj) + { + if (obj instanceof GCMParameters) + { + return (GCMParameters)obj; + } + else if (obj != null) + { + return new GCMParameters(ASN1Sequence.getInstance(obj)); + } + + return null; + } + + private GCMParameters( + ASN1Sequence seq) + { + this.nonce = ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets(); + + if (seq.size() == 2) + { + this.icvLen = ASN1Integer.getInstance(seq.getObjectAt(1)).getValue().intValue(); + } + else + { + this.icvLen = 12; + } + } + + public GCMParameters( + byte[] nonce, + int icvLen) + { + this.nonce = Arrays.clone(nonce); + this.icvLen = icvLen; + } + + public byte[] getNonce() + { + return Arrays.clone(nonce); + } + + public int getIcvLen() + { + return icvLen; + } + + public ASN1Primitive toASN1Primitive() + { + ASN1EncodableVector v = new ASN1EncodableVector(); + + v.add(new DEROctetString(nonce)); + + if (icvLen != 12) + { + v.add(new ASN1Integer(icvLen)); + } + + return new DERSequence(v); + } +} |