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TECHNICAL SPECIFICATION
Electronic Signatures and Infrastructures (ESI);
CAdES digital signatures;
Part 1: Building blocks and CAdES baseline signatures
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2 ETSI TS 119 122-1 V1.0.1 (2015-07)
Reference
RTS/ESI-0019122-1-TS
Keywords
ASN.1, CAdES, electronic signature, profile,
security
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3 ETSI TS 119 122-1 V1.0.1 (2015-07)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 9
4 General syntax . 9
4.1 General requirements . 9
4.2 The data content type. 9
4.3 The signed-data content type . 9
4.4 The SignedData type . 9
4.5 The EncapsulatedContentInfo type . 10
4.6 The SignerInfo type . 10
4.7 ASN.1 Encoding . 10
4.7.1 DER . 10
4.7.2 BER . 10
4.8 Other standard data structures . 10
4.8.1 Time-stamp token format . 10
4.8.2 Additional types . 10
4.9 Attributes . 11
5 Attribute semantics and syntax . 11
5.1 CMS defined basic signed attributes . 11
5.1.1 The content-type attribute . 11
5.1.2 The message-digest attribute . 11
5.2 Basic attributes for CAdES signatures . 12
5.2.1 The signing-time attribute . 12
5.2.2 Signing certificate reference attributes . 12
5.2.2.1 General requirements . 12
5.2.2.2 ESS signing-certificate attribute . 12
5.2.2.3 ESS signing-certificate-v2 attribute . 13
5.2.3 The commitment-type-indication attribute . 13
5.2.4 Attributes for identifying the signed data type . 14
5.2.4.1 The content-hints attribute . 14
5.2.4.2 The mime-type attribute . 14
5.2.5 The signer-location attribute . 15
5.2.6 Incorporating attributes of the signer . 15
5.2.6.1 The signer-attributes-v2 attribute . 15
5.2.6.2 claimed-SAML-assertion . 17
5.2.7 The countersignature attribute . 17
5.2.8 The content-time-stamp attribute . 18
5.2.9 The signature-policy-identifier attribute and the SigPolicyQualifierInfo type . 18
5.2.9.1 The signature-policy-identifier attribute . 18
5.2.9.2 The SigPolicyQualifierInfo type . 19
5.2.10 The signature-policy-store attribute . 21
5.2.11 The content-reference attribute . 21
5.2.12 The content-identifier attribute . 22
5.3 The signature-time-stamp attribute . 22
ETSI
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4 ETSI TS 119 122-1 V1.0.1 (2015-07)
5.4 Attributes for validation data values . 23
5.4.1 Introduction. 23
5.4.2 OCSP responses . 23
5.4.2.1 OCSP response types . 23
5.4.2.2 OCSP responses within RevocationInfoChoices . 23
5.4.3 CRLs . 23
5.5 Archive validation data . 23
5.5.1 Introduction. 23
5.5.2 The ats-hash-index-v2 attribute . 23
5.5.3 The archive-time-stamp-v3 attribute . 25
6 CAdES baseline signatures . 27
6.1 Signature levels . 27
6.2 General requirements . 28
6.2.1 Algorithm requirements . 28
6.2.2 Notation for requirements . 28
6.3 Requirements on components and services . 30
6.4 Legacy CAdES baseline signatures . 33
Annex A (normative): Additional Attributes Specification . 34
A.1 Attributes for validation data . 34
A.1.1 Certificates validation data . 34
A.1.1.1 The complete-certificate-references attribute . 34
A.1.1.2 The certificate-values attribute . 35
A.1.2 Revocation validation data . 35
A.1.2.1 The complete-revocation-references attribute. 35
A.1.2.2 The revocation-values attribute . 37
A.1.3 The attribute-certificate-references attribute . 38
A.1.4 The attribute-revocation-references attribute . 39
A.1.5 Time-stamps on references to validation data . 40
A.1.5.1 The time-stamped-certs-crls-references attribute . 40
A.1.5.2 The CAdES-C-timestamp attribute . 40
A.2 Deprecated attributes . 41
A.2.1 Usage of deprecated attributes . 41
A.2.2 The other-signing-certificate attribute . 41
A.2.3 The signer-attributes attribute . 41
A.2.4 The archive-time-stamp attribute . 41
A.2.5 The long-term-validation attribute . 41
A.2.6 The ats-hash-index attribute . 42
Annex B (informative): Signature Format Definitions Using X.208 ASN.1 Syntax . 43
Annex C (normative): Signature Format Definitions Using X.680 ASN.1 Syntax . 49
Annex D (informative): Example Structured Contents and MIME . 56
D.1 Use of MIME to Encode Data . 56
D.1.1 MIME Structure . 56
D.1.2 Header Information . 56
D.1.3 Content Encoding . 57
D.1.4 Multi-Part Content . 57
D.2 S/MIME . 58
D.2.1 Using S/MIME . 58
D.2.2 Using application/pkcs7-mime . 58
D.2.3 Using multipart/signed and application/pkcs7-signature . 59
D.3 Use of MIME in the signature . 59
Annex E (informative): Change history . 61
History . 62
ETSI
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5 ETSI TS 119 122-1 V1.0.1 (2015-07)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI).
The present document is part 1 of a multi-part deliverable covering CAdES digital signatures as identified below:
Part 1: "Building blocks and CAdES baseline signatures";
Part 2: "Extended CAdES signatures".
The present document partly contains an evolved specification of the ETSI TS 101 733 [1] and ETSI TS 103 173 [i.1].
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
(Verbal forms for the expression of
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
Electronic commerce has emerged as a frequent way of doing business between companies across local, wide area and
global networks. Trust in this way of doing business is essential for the success and continued development of
electronic commerce. It is therefore important that companies using this electronic means of doing business have
suitable security controls and mechanisms in place to protect their transactions and to ensure trust and confidence with
their business partners. In this respect digital signatures are an important security component that can be used to protect
information and provide trust in electronic business.
The present document is intended to cover digital signatures supported by PKI and public key certificates, and aims to
meet the general requirements of the international community to provide trust and confidence in electronic transactions,
including, amongst other, applicable requirements from Regulation (EU) No 910/2014 [i.13].
The present document can be used for any transaction between an individual and a company, between two companies,
between an individual and a governmental body, etc. The present document is independent of any environment. It can
be applied to any environment e.g. smart cards, GSM SIM cards, special programs for electronic signatures, etc.
The present document is part of a rationalized framework of standards (see ETSI TR 119 000 [i.2]). See
ETSI TR 119 100 [i.4] for getting guidance on how to use the present document within the aforementioned framework.
ETSI
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6 ETSI TS 119 122-1 V1.0.1 (2015-07)
1 Scope
The present document specifies CAdES digital signatures. CAdES signatures are built on CMS signatures [7], by
incorporation of signed and unsigned attributes, which fulfil certain common requirements (such as the long term
validity of digital signatures, for instance) in a number of use cases.
The present document specifies the ASN.1 definitions for the aforementioned attributes as well as their usage when
incorporating them to CAdES signatures.
The present document specifies formats for CAdES baseline signatures, which provide the basic features necessary for a
wide range of business and governmental use cases for electronic procedures and communications to be applicable to a
wide range of communities when there is a clear need for interoperability of digital signatures used in electronic
documents.
The present document defines four levels of CAdES baseline signatures addressing incremental requirements to
maintain the validity of the signatures over the long term, in a way that a certain level always addresses all the
requirements addressed at levels that are below it. Each level requires the presence of certain CAdES attributes, suitably
profiled for reducing the optionality as much as possible.
Procedures for creation and validation of CAdES digital signatures are out of scope and specified in
ETSI TS 119 102-1 [i.5].
The present document aims at supporting digital signatures in different regulatory frameworks.
NOTE: Specifically, but not exclusively, CAdES digital signatures specified in the present document aim at
supporting electronic signatures, advanced electronic signatures, qualified electronic signatures,
electronic seals, advanced electronic seals, and qualified electronic seals as per Regulation (EU)
No 910/2014 [i.13].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 101 733 (V2.2.1): "Electronic Signatures and Infrastructures (ESI); CMS Advanced
Electronic Signatures (CAdES)".
[2] IETF RFC 2045 (1996): "Multipurpose Internet Mail Extensions (MIME) Part One: Format of
Internet Message Bodies".
[3] IETF RFC 2634 (1999): "Enhanced Security Services for S/MIME".
[4] IETF RFC 3161 (2001): "Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)".
[5] IETF RFC 5035 (2007): "Enhanced Security Services (ESS) Update: Adding CertID Algorithm
Agility".
[6] IETF RFC 5280 (2008): "Internet X.509 Public Key Infrastructure Certificate and Certificate
Revocation List (CRL) Profile".
NOTE: Obsoletes IETF RFC 3280.
ETSI
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7 ETSI TS 119 122-1 V1.0.1 (2015-07)
[7] IETF RFC 5652 (2009): "Cryptographic Message Syntax (CMS)".
NOTE: Obsoletes RFC 3852.
[8] IETF RFC 5755 (2010): "An Internet Attribute Certificate Profile for Authorization".
NOTE: Obsoletes IETF RFC 3281.
[9] IETF RFC 5816 (2010): "ESSCertIDv2 Update for RFC 3161".
[10] IETF RFC 5911 (2010): "New ASN.1 Modules for Cryptographic Message Syntax (CMS) and
S/MIME".
[11] IETF RFC 5912 (2010): "New ASN.1 Modules for the Public Key Infrastructure Using X.509
(PKIX)".
NOTE: Updated by IETF RFC 6268.
[12] IETF RFC 6268 (2011): "Additional New ASN.1 Modules for the Cryptographic Message Syntax
(CMS) and the Public Key Infrastructure Using X.509 (PKIX)".
[13] IETF RFC 5940 (2010): "Additional Cryptographic Message Syntax (CMS) Revocation
Information Choices".
[14] IETF RFC 6960 (2013): "X.509 Internet Public Key Infrastructure Online Certificate Status
Protocol - OCSP".
NOTE: Obsoletes IETF RFC 2560.
[15] Recommendation ITU-T X.520 (11/2008)/ISO/IEC 9594-6:2008): "Information technology -
Open Systems Interconnection - The Directory: Selected attribute types".
[16] Recommendation ITU-T X.680 (2008): "Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation".
[17] Recommendation ITU-T X.690 (2008): "Information technology - ASN.1 encoding rules:
Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and
Distinguished Encoding Rules (DER)".
[18] OASIS Standard "Security Assertion Markup Language (SAML) V2.0".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TS 103 173: "Electronic Signatures and Infrastructures (ESI); CAdES Baseline Profile".
[i.2] ETSI TR 119 000: "Electronic Signatures and Infrastructures (ESI); Rationalized structure for
Electronic Signature Standardization".
[i.3] ETSI TR 119 001: "Electronic Signatures and Infrastructures (ESI); Definitions and
abbreviations".
[i.4] ETSI TR 119 100: "Electronic Signatures and Infrastructures (ESI); Business Driven Guidance for
Signature Creation and Validation".
[i.5] ETSI TS 119 102-1: "Electronic Signatures and Infrastructures (ESI); Procedures for Signature
Creation and Validation".
ETSI
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8 ETSI TS 119 122-1 V1.0.1 (2015-07)
[i.6] ETSI TS 119 122-2: "Electronic Signatures and Infrastructures (ESI); CAdES digital signatures;
Part 2: Extended CAdES signatures".
[i.7] ETSI TS 119 172-1: "Electronic Signatures and Infrastructures (ESI); Signature policies;
Part 1: Building blocks and table of contents for human readable signature policy documents ".
[i.8] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[i.9] ETSI TS 119 422: "Electronic Signatures and Infrastructures (ESI); Time-stamping protocol and
time-stamp profiles".
[i.10] ETSI TS 101 533-1: "Electronic Signatures and Infrastructures (ESI); Data Preservation Systems
Security; Part 1: Requirements for Implementation and Management".
[i.11] ETSI TS 119 612: "Electronic Signatures and Infrastructures (ESI); Trusted Lists".
[i.12] Commission Decision 2009/767/EC of 16 October 2009 amended by CD 2010/425/EU of 28 July
2010, setting out measures facilitating the use of procedures by electronic means through the
"points of single contact" under Directive 2006/123/EC of the European Parliament and of the
Council on services in the internal market.
[i.13] Regulation (EU) No 910/2014 of the European Parliament and of the Council of 23 July 2014 on
electronic identification and trust services for electronic transactions in the internal market and
repealing Directive 1999/93/EC. OJ L 257, 28.8.2014, p. 73-114.
[i.14] IETF RFC 3851 (2004): "Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1
Message Specification".
[i.15] IETF RFC 4998 (2007): "Evidence Record Syntax (ERS)".
[i.16] Recommendation ITU-T X.208 (1988): "Specification of Abstract Syntax Notation One (ASN.1)".
[i.17] Recommendation ITU-T X.501 (2008)/ISO/IEC 9594-1 (2008): "I
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