## Public_Key 1.11.2

### Fixed Bugs and Malfunctions

public_key:pkix_sign/2 now honors the salt length from the provided input parameters. Earlier this could result in incorrect signatures if not using recommended defaults.

Own Id: OTP-17534 Aux Id: GH-5054, PR-5057

### Improvements and New Features

When decoding an 'ECPrivateKey' unwrap the private key. For more precise information see RFC 8410, section 7.

Own Id: OTP-17609 Aux Id: GH-5157, GH-5156

## Public_Key 1.11.1

### Fixed Bugs and Malfunctions

Handle cross-signed root certificates when old root expired as reported in GH-4877.

Own Id: OTP-17475 Aux Id: GH-4877

## Public_Key 1.11

### Improvements and New Features

TLS connections now support EdDSA certificates.

Own Id: OTP-17142 Aux Id: PR-4756, GH-4637, GH-4650

The functions public_key:ssh_encode/2, public_key:ssh_decode/2, public_key:ssh_hostkey_fingerprint/1 and public_key:ssh_hostkey_fingerprint/2 are deprecated.

Replacement functions are available in SSH, see the Deprecations chapter in the Erlang/OTP documentation.

Own Id: OTP-17352

Enhance documentation and logging of certificate handling.

Own Id: OTP-17384 Aux Id: GH-4800

## Public_Key 1.10.0.1

### Fixed Bugs and Malfunctions

Handle cross-signed root certificates when old root expired as reported in GH-4877.

Own Id: OTP-17475 Aux Id: GH-4877

## Public_Key 1.10

### Fixed Bugs and Malfunctions

Fixed case insensitive hostname check.

Own Id: OTP-17242 Aux Id: GH-4500

### Improvements and New Features

Add sanity check of trusted anchor certificate expiration to pkix_path_validation/3. Although the anchor is considered a trusted input this sanity check does provide extra security for the users of the public_key application as this property needs to be checked at time of usage and fits very well with the other checks performed here.

Own Id: OTP-16907

Adjust generation of test certificates to conform to RFC 5280 rules for formatting of the certificates validity

Own Id: OTP-17111

## Public_Key 1.9.2

### Improvements and New Features

Corrected dialyzer spec for pkix_path_validation/3

Own Id: OTP-17069

## Public_Key 1.9.1

### Fixed Bugs and Malfunctions

Fix the issue that pem_decode will crash with an invalid input.

Own Id: OTP-16902 Aux Id: ERIERL-534

## Public_Key 1.9

### Fixed Bugs and Malfunctions

Fixed an insignificant whitespace issue when decoding PEM file.

Own Id: OTP-16801 Aux Id: ERL-1309

### Improvements and New Features

Experimental OCSP client support.

Own Id: OTP-16448

Use user returned path validation error for selfsigned cert. It allows users of the ssl application to customize the generated TLS alert, within the range of defined alerts.

Own Id: OTP-16592

add API function to retrieve the subject-ID of an X509 certificate

Own Id: OTP-16705

## Public_Key 1.8

### Improvements and New Features

Added support for RSA-PSS signature schemes

Own Id: OTP-15247

Calls of deprecated functions in the Old Crypto API are replaced by calls of their substitutions.

Own Id: OTP-16346

## Public_Key 1.7.2

### Improvements and New Features

Add support for key exchange with Edward curves and PSS-RSA padding in signature verification.

Own Id: OTP-16528

## Public_Key 1.7.1

### Fixed Bugs and Malfunctions

Corrected CRL handling which could cause CRL verification to fail. This could happen when the CRL distribution point explicitly specifies the CRL issuer, that is not using the fallback.

Own Id: OTP-16156 Aux Id: ERL-1030

## Public_Key 1.7

### Fixed Bugs and Malfunctions

Support Password based encryption with AES

Own Id: OTP-15870 Aux Id: ERL-952

### Improvements and New Features

Change dialyzer spec to avoid confusion

Own Id: OTP-15843 Aux Id: ERL-915

## Public_Key 1.6.7

### Fixed Bugs and Malfunctions

RSA options passed to crypto for encrypt and decrypt with public or private key.

Own Id: OTP-15754 Aux Id: ERL-878

Fix dialyzer warnings caused by a faulty type specification for digest_type().

This change updates digest_type() and the functions operating with this argument type to accept both 'sha1' and 'sha' as digest_type().

Own Id: OTP-15776

### Improvements and New Features

Add possibility to read PEM files encrypted with old PEM encryption using AES-256

Own Id: OTP-13726

Relax decoding of certificates to so that "harmless" third party encoding errors may be accepted but not created by the public_key application. This adds acceptance of using an incorrect three character country code, the PKIX standard use two character country codes. It is also accepted that the country code is utf8 encoded but the specification says it should be ASCII.

Own Id: OTP-15687 Aux Id: PR-2162

## Public_Key 1.6.6.1

### Fixed Bugs and Malfunctions

Support Pasword based encryption with AES

Own Id: OTP-15870 Aux Id: ERL-952

## Public_Key 1.6.6

### Improvements and New Features

Back port of bug fix ERL-893 from OTP-22 and document enhancements that will solve dialyzer warnings for users of the ssl application.

This change also affects public_key, eldap (and inet doc).

Own Id: OTP-15785 Aux Id: ERL-929, ERL-893, PR-2215

## Public_Key 1.6.5

### Improvements and New Features

Add export of dialyzer type

Own Id: OTP-15624

## Public_Key 1.6.4

### Improvements and New Features

Added ed25519 and ed448 sign/verify.

Requires OpenSSL 1.1.1 or higher as cryptolib under the OTP application crypto.

Own Id: OTP-15419 Aux Id: OTP-15094

## Public_Key 1.6.3

### Fixed Bugs and Malfunctions

Add DSA SHA2 oids in public_keys ASN1-spec and public_key:pkix_sign_types/1

Own Id: OTP-15367

## Public_Key 1.6.2

### Fixed Bugs and Malfunctions

Removed #DSAPrivateKey{} as acceptable input to public_key:verify/5.

Own Id: OTP-15284

### Improvements and New Features

The typing in the CRYPTO and PUBLIC_KEY applications are reworked and a few mistakes are corrected.

The documentation is now generated from the typing and some clarifications are made.

A new chapter on Algorithm Details such as key sizes and availability is added to the CRYPTO User's Guide.

Own Id: OTP-15134

## Public_Key 1.6.1

### Fixed Bugs and Malfunctions

Some of the keylengths in the newly generated moduli file in public_key are not universally supported. This could cause the SSH key exchange diffie-hellman-group-exchange-sha* to fail.

Those keylengths are now removed.

Own Id: OTP-15151 Aux Id: OTP-15113

## Public_Key 1.6

### Fixed Bugs and Malfunctions

Update calls to the base64 module to conform to that module's type specifications.

Own Id: OTP-14788 Aux Id: OTP-14624

### Improvements and New Features

Use uri_string module instead of http_uri.

Own Id: OTP-14902

A new function - public_key:pkix_verify_hostname_match_fun/1 - returns a fun to be given as option match_fun to public_key:pkix_verify_hostname/3 or via ssl.

The fun makes the verify hostname matching according to the specific rules for the protocol in the argument. Presently only https is supported.

Own Id: OTP-14962 Aux Id: ERL-542, OTP-15102

Compleate PKCS-8 encoding support and enhance the decoding of 'PrivateKeyInfo' to conform to the rest of Erlang public_key API.

Own Id: OTP-15093

A new moduli file is generated. This file is used for the recommended diffie-hellman-group-exchange-sha256 key exchange algorithm in SSH.

Own Id: OTP-15113

## Public_Key 1.5.2

### Fixed Bugs and Malfunctions

Fixed a bug in public_key:ssh_encode/2 that made it possible to erroneously encode e.g. an RSA key with another type e.g. ECDSA in the resulting binary.

Own Id: OTP-14570 Aux Id: ERIERL-52, OTP-14676

Corrected handling of parameterized EC keys in public_key:generate_key/1 so that it will work as expected instead of causing a runtime error in crypto.

Own Id: OTP-14620

## Public_Key 1.5.1

### Improvements and New Features

Hostname verification: Add handling of the general name iPAddress in certificate's subject alternative name extension (subjAltName).

Own Id: OTP-14653

Correct key handling in pkix_test_data/1 and use a generic example mail address instead of an existing one.

Own Id: OTP-14766

## Public_Key 1.5

### Fixed Bugs and Malfunctions

public_key now handles elliptic curve parameters in a consistent way so that decoded ECDSA keys can be correctly re-encoded.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-14621 Aux Id: ERL-480, ERL-481

### Improvements and New Features

Extend crypto:sign, crypto:verify, public_key:sign and public_key:verify with:

* support for RSASSA-PS padding for signatures and for saltlength setting
* X9.31 RSA padding.
* sha, sha224, sha256, sha384, and sha512 for dss signatures as mentioned in NIST SP 800-57 Part 1.
* ripemd160 to be used for rsa signatures.

This is a manual merge of half of the pull request 838 by potatosalad from Sept 2015.

Own Id: OTP-13704 Aux Id: PR838

Add API function pkix_test_data/1 for facilitating automated testing. This is useful for applications that preform X509-certifcate path validation of so called certificate chains, such as TLS.

Own Id: OTP-14181

Improved error propagation and reports

Own Id: OTP-14236

RSAPrivateKey version is set to 'two-prime' instead of using the underlying enumeration value directly.

Own Id: OTP-14534

Deprecated function crypto:rand_uniform/2 is replaced by rand:uniform/1.

Own Id: OTP-14608

## Public_Key 1.4.1

### Fixed Bugs and Malfunctions

Bug for public_key:generate_key({namedCurve,OID}) fixed.

Own Id: OTP-14258

### Improvements and New Features

Modernized internal representation used for crl validation by use of maps.

Own Id: OTP-14111

Support EC key in pkix_sign/2

Own Id: OTP-14294

## Public_Key 1.4

### Improvements and New Features

New function pkix_verify_hostname/2,3 Implements certificate hostname checking. See the manual and RFC 6125.

Own Id: OTP-13009

The ssh host key fingerprint generation now also takes a list of algorithms and returns a list of corresponding fingerprints. See public_key:ssh_hostkey_fingerprint/2 and the option silently_accept_hosts in ssh:connect.

Own Id: OTP-14223

## Public_Key 1.3

### Improvements and New Features

New function public_key:ssh_hostkey_fingerprint/1,2 to calculate the SSH host key fingerprint string.

Own Id: OTP-13888 Aux Id: OTP-13887

## Public_Key 1.2

### Fixed Bugs and Malfunctions

The ASN-1 type GeneralName can have more values, then the most common directory name, the code now handles this.

Own Id: OTP-13554

### Improvements and New Features

Handle PEM encoded EC public keys

Own Id: OTP-13408

## Public_Key 1.1.1

### Fixed Bugs and Malfunctions

An encapsulated PEM header shall be followed by a blank line

Own Id: OTP-13381 Aux Id: seq13070

## Public_Key 1.1

### Improvements and New Features

The 'ecdsa-sha2-nistp256', 'ecdsa-sha2-nistp384' and 'ecdsa-sha2-nistp521' signature algorithms for ssh are implemented. See RFC 5656.

Own Id: OTP-12936

There is now a file (public_key/priv/moduli) which lists size-generator-modulus triples. The purpose is to give servers the possibility to select the crypto primes randomly among a list of pregenerated triples. This reduces the risk for some attacks on diffie-hellman negotiation.

See the reference manual for public_key:dh_gex_group/4 where the handling of this is described.

The ssh server (ssh:daemon) uses this.

Own Id: OTP-13054 Aux Id: OTP-13052

Add different upper bounds for diffrent string types as suggested by comment in PKIX1Explicit88.

Own Id: OTP-13132

## Public_Key 1.0.1

### Improvements and New Features

Document enhancements

Own Id: OTP-12986

## Public_Key 1.0

### Improvements and New Features

public_key: Remove legacy switch compact_bit_string

E.i bitstrings will not be decode as {Unused, Binary}, they are now Erlang bitstrings.

Also the compact_bit_string implies the legacy_erlang_types switch So removing the switch will also make OCTET STRING values be represented as binaries.

Undecoded open type will now be wrapped in a asn1_OPENTYPE tuple.

This will change some values in records returned by the public_key API making this change a potentiall incompatibility.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-12110

## Public_Key 0.23

### Improvements and New Features

Improve/extend support for CRL handling.

Own Id: OTP-12547 Aux Id: OTP-10362

## Public_Key 0.22.1

### Fixed Bugs and Malfunctions

Added missing encoding support for PBES2, and also completed support for PBES1 that was incomplete.

Own Id: OTP-11915

## Public_Key 0.22

### Fixed Bugs and Malfunctions

Fix incorrect dialyzer spec and types, also enhance documentation.

Thanks to Ayaz Tuncer.

Own Id: OTP-11627

Application upgrade (appup) files are corrected for the following applications:

asn1, common_test, compiler, crypto, debugger, dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe, inets, observer, odbc, os_mon, otp_mibs, parsetools, percept, public_key, reltool, runtime_tools, ssh, syntax_tools, test_server, tools, typer, webtool, wx, xmerl

A new test utility for testing appup files is added to test_server. This is now used by most applications in OTP.

(Thanks to Tobias Schlager)

Own Id: OTP-11744

### Improvements and New Features

Moved elliptic curve definition from the crypto NIF/OpenSSL into Erlang code, adds the RFC-5639 brainpool curves and makes TLS use them (RFC-7027).

Thanks to Andreas Schultz

Own Id: OTP-11578

Handle v1 CRLs, with no extensions and fixes issues with IDP (Issuing Distribution Point) comparison during CRL validation.

Thanks to Andrew Thompson

Own Id: OTP-11761

## Public_Key 0.21

### Improvements and New Features

Fixed a little typo in public_key documentation. Thanks to Tomas Morstein.

Own Id: OTP-11380

public_key: Workaround for incorrectly encoded utf8 emailAddress. Thanks to Andrew Bennett.

Own Id: OTP-11470

## Public_Key 0.20

### Improvements and New Features

Extend PKCS-7 to support SCEP (Simple Certificate Enrollment Protocol).

Own Id: OTP-10874

public_key:pem_entry_decode/2 now handles AES-128-CBC ciphered keys. Thanks to Simon Cornish.

Own Id: OTP-11281

## Public_Key 0.19

### Improvements and New Features

Add support for ISO oids 1.3.14.3.2.29 and 1.3.14.3.2.27 that are somtimes used instead of the PKCS defined oids 1.2.840.113549.1.1.5 and 1.2.840.10040.4.3. Add function pkix_sign_types:/1 that translates oids to to algorithm atoms ex:

> public_key:pkix_sign_types({1,3,14,3,2,29}). {sha,rsa}

Own Id: OTP-10873

Integrate elliptic curve contribution from Andreas Schultz

In order to be able to support elliptic curve cipher suites in SSL/TLS, additions to handle elliptic curve infrastructure has been added to public_key and crypto.

This also has resulted in a rewrite of the crypto API to gain consistency and remove unnecessary overhead. All OTP applications using crypto has been updated to use the new API.

Impact: Elliptic curve cryptography (ECC) offers equivalent security with smaller key sizes than other public key algorithms. Smaller key sizes result in savings for power, memory, bandwidth, and computational cost that make ECC especially attractive for constrained environments.

Own Id: OTP-11009

## Public_Key 0.18

### Fixed Bugs and Malfunctions

Fix subjectPublicKeyInfo type comment in public_key. Thanks to Ryosuke Nakai.

Own Id: OTP-10670

### Improvements and New Features

public_key now supports CRL validation and documents the function public_key:pkix_path_validation/3

Own Id: OTP-7045

Some examples overflowing the width of PDF pages have been corrected.

Own Id: OTP-10665

Fixed typo's in public_key spec.

Own Id: OTP-10723

Corrected PKCS-10 documentation and added some PKCS-9 support that is fairly commonly used by PKCS-10. Full support for PKCS-9 will be added later.

Own Id: OTP-10767

## Public_Key 0.17

### Fixed Bugs and Malfunctions

ssh_decode now handles comments, at the end of the line, containing withe spaces correctly

Own Id: OTP-9361

Add missing references to sha224 and sha384

Own Id: OTP-9362 Aux Id: seq12116

### Improvements and New Features

public_key now supports PKCS-10 and includes exprimental support for PKCS-7

Own Id: OTP-10509 Aux Id: kunagi-291 [202]

## Public_Key 0.16

### Improvements and New Features

Add crypto and public_key support for the hash functions SHA224, SHA256, SHA384 and SHA512 and also hmac and rsa_sign/verify support using these hash functions. Thanks to Andreas Schultz for making a prototype.

Own Id: OTP-9908

Optimize RSA private key handling in crypto and public_key.

Own Id: OTP-10065

## Public_Key 0.15

### Improvements and New Features

Changed ssh implementation to use the public_key application for all public key handling. This is also a first step for enabling a callback API for supplying public keys and handling keys protected with password phrases.

Additionally the test suites where improved so that they do not copy the users keys to test server directories as this is a security liability. Also ipv6 and file access issues found in the process has been fixed.

This change also solves OTP-7677 and OTP-7235

This changes also involves some updates to public_keys ssh-functions.

Own Id: OTP-9911

## Public_Key 0.14

### Improvements and New Features

public_key, ssl and crypto now supports PKCS-8

Own Id: OTP-9312

The asn1 decoder/encoder now uses a runtime nif from the asn1 application if it is available.

Own Id: OTP-9414

## Public_Key 0.13

### Fixed Bugs and Malfunctions

replace "a ssl" with "an ssl" reindent pkix_path_validation/3 Trivial documentation fixes (Thanks to Christian von Roques )

Own Id: OTP-9464

## Public_Key 0.12

### Improvements and New Features

The public_key application now supports encode/decode of ssh public-key files.

Own Id: OTP-9144

## Public_Key 0.11

### Improvements and New Features

Allows the public_key module to decode and encode RSA and DSA keys encoded using the SubjectPublicKeyInfo format. When pem_entry_encode is called on an RSA or DSA public key type, the key is wrapped in the SubjectPublicKeyInfo format.

Own Id: OTP-9061

## Public_Key 0.10

### Improvements and New Features

Improved dialyzer specs.

Own Id: OTP-8964

## Public_Key 0.9

### Improvements and New Features

Updated ssl to ignore CA certs that violate the asn1-spec for a certificate, and updated public key asn1 spec to handle inherited DSS-params.

Own Id: OTP-7884

Changed ssl implementation to retain backwards compatibility for old option {verify, 0} that shall be equivalent to {verify, verify_none}, also separate the cases unknown ca and selfsigned peer cert, and restored return value of deprecated function public_key:pem_to_der/1.

Own Id: OTP-8858

Better handling of v1 and v2 certificates. V1 and v2 certificates does not have any extensions so then validate_extensions should just accept that there are none and not end up in missing_basic_constraints clause.

Own Id: OTP-8867

Changed the verify fun so that it differentiate between the peer certificate and CA certificates by using valid_peer or valid as the second argument to the verify fun. It may not always be trivial or even possible to know when the peer certificate is reached otherwise.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-8873

## Public_Key 0.8

### Fixed Bugs and Malfunctions

Handling of unknown CA certificates was changed in ssl and public_key to work as intended.

Own Id: OTP-8788

### Improvements and New Features

Revise the public_key API - Cleaned up and documented the public_key API to make it useful for general use, also changed ssl to use the new API.

Own Id: OTP-8722

Added the functionality so that the verification fun will be called when a certificate is considered valid by the path validation to allow access to each certificate in the path to the user application. Also try to verify subject-AltName, if unable to verify it let the application verify it.

Own Id: OTP-8825

## Public_Key 0.7

### Fixed Bugs and Malfunctions

Certificates without any extensions could not be handled by public_key.

Own Id: OTP-8626

### Improvements and New Features

Code cleanup and minor bugfixes.

Own Id: OTP-8649

## Public_Key 0.6

### Improvements and New Features

Support for Diffie-Hellman. ssl-3.11 requires public_key-0.6.

Own Id: OTP-7046

Moved extended key usage test for ssl values to ssl.

Own Id: OTP-8553 Aux Id: seq11541, OTP-8554

## Public_Key 0.5

### Improvements and New Features

Added public_key:pkix_transform/2 to enable ssl to send CA list during Certificate Request.

NOTE: SSL (new_ssl) requires public_key-0.5. ssl usage.

Own Id: OTP-8372

## Public_Key 0.4

### Improvements and New Features

The documentation is now built with open source tools (xsltproc and fop) that exists on most platforms. One visible change is that the frames are removed.

Own Id: OTP-8250

## Public_Key 0.3

### Fixed Bugs and Malfunctions

Unknown attributes in certificates are left encoded instead of crashing. Patch by Will "wglozer" thanks.

Own Id: OTP-8100

### Improvements and New Features

Allow public_key:pem_to_der/[1,2] to take a binary as argument in addition to a filename. Patch by Geoff Cant, thanks.

Own Id: OTP-8142

## Public_Key 0.2

### Improvements and New Features

X509 certificate handling has been extended and improved as a result of more extensive testing of both the ssl and public_key application. Even more extensions of the certificate handling is yet to be implemented.

Own Id: OTP-7860

## Public_Key 0.1

### Improvements and New Features

First version.

Own Id: OTP-7637