Fork the pieces of the Go standard library's crypto/x509
package which are relevant to parsing, handling, and
signing CRLs.
In our fork, fix an upstream parsing bug, hoist the reasonCode
out of the crlEntryExtensions for easier usability, and enforce
that CRL Numbers are never longer than 20 octets.
Part of #6199
Fixes#3836.
```
$ ./test.sh
ok github.com/cloudflare/cfssl/api 1.023s coverage: 81.1% of statements
ok github.com/cloudflare/cfssl/api/bundle 1.464s coverage: 87.2% of statements
ok github.com/cloudflare/cfssl/api/certadd 16.766s coverage: 86.8% of statements
ok github.com/cloudflare/cfssl/api/client 1.062s coverage: 51.9% of statements
ok github.com/cloudflare/cfssl/api/crl 1.075s coverage: 75.0% of statements
ok github.com/cloudflare/cfssl/api/gencrl 1.038s coverage: 72.5% of statements
ok github.com/cloudflare/cfssl/api/generator 1.478s coverage: 33.3% of statements
ok github.com/cloudflare/cfssl/api/info 1.085s coverage: 84.1% of statements
ok github.com/cloudflare/cfssl/api/initca 1.050s coverage: 90.5% of statements
ok github.com/cloudflare/cfssl/api/ocsp 1.114s coverage: 93.8% of statements
ok github.com/cloudflare/cfssl/api/revoke 3.063s coverage: 75.0% of statements
ok github.com/cloudflare/cfssl/api/scan 2.988s coverage: 62.1% of statements
ok github.com/cloudflare/cfssl/api/sign 2.680s coverage: 83.3% of statements
ok github.com/cloudflare/cfssl/api/signhandler 1.114s coverage: 26.3% of statements
ok github.com/cloudflare/cfssl/auth 1.010s coverage: 68.2% of statements
ok github.com/cloudflare/cfssl/bundler 22.078s coverage: 84.5% of statements
ok github.com/cloudflare/cfssl/certdb/dbconf 1.013s coverage: 84.2% of statements
ok github.com/cloudflare/cfssl/certdb/ocspstapling 1.302s coverage: 69.2% of statements
ok github.com/cloudflare/cfssl/certdb/sql 1.223s coverage: 70.5% of statements
ok github.com/cloudflare/cfssl/cli 1.014s coverage: 62.5% of statements
ok github.com/cloudflare/cfssl/cli/bundle 1.011s coverage: 0.0% of statements [no tests to run]
ok github.com/cloudflare/cfssl/cli/crl 1.086s coverage: 57.8% of statements
ok github.com/cloudflare/cfssl/cli/gencert 7.927s coverage: 83.6% of statements
ok github.com/cloudflare/cfssl/cli/gencrl 1.064s coverage: 73.3% of statements
ok github.com/cloudflare/cfssl/cli/gencsr 1.058s coverage: 70.3% of statements
ok github.com/cloudflare/cfssl/cli/genkey 2.718s coverage: 70.0% of statements
ok github.com/cloudflare/cfssl/cli/ocsprefresh 1.077s coverage: 64.3% of statements
ok github.com/cloudflare/cfssl/cli/revoke 1.033s coverage: 88.2% of statements
ok github.com/cloudflare/cfssl/cli/scan 1.014s coverage: 36.0% of statements
ok github.com/cloudflare/cfssl/cli/selfsign 2.342s coverage: 73.2% of statements
ok github.com/cloudflare/cfssl/cli/serve 1.076s coverage: 38.2% of statements
ok github.com/cloudflare/cfssl/cli/sign 1.070s coverage: 54.8% of statements
ok github.com/cloudflare/cfssl/cli/version 1.011s coverage: 100.0% of statements
ok github.com/cloudflare/cfssl/cmd/cfssl 1.028s coverage: 0.0% of statements [no tests to run]
ok github.com/cloudflare/cfssl/cmd/cfssljson 1.012s coverage: 3.4% of statements
ok github.com/cloudflare/cfssl/cmd/mkbundle 1.011s coverage: 0.0% of statements [no tests to run]
ok github.com/cloudflare/cfssl/config 1.023s coverage: 67.7% of statements
ok github.com/cloudflare/cfssl/crl 1.054s coverage: 68.3% of statements
ok github.com/cloudflare/cfssl/csr 8.473s coverage: 89.6% of statements
ok github.com/cloudflare/cfssl/errors 1.014s coverage: 79.6% of statements
ok github.com/cloudflare/cfssl/helpers 1.216s coverage: 80.6% of statements
ok github.com/cloudflare/cfssl/helpers/derhelpers 1.017s coverage: 48.0% of statements
ok github.com/cloudflare/cfssl/helpers/testsuite 7.826s coverage: 65.8% of statements
ok github.com/cloudflare/cfssl/initca 151.314s coverage: 73.2% of statements
ok github.com/cloudflare/cfssl/log 1.013s coverage: 59.3% of statements
ok github.com/cloudflare/cfssl/multiroot/config 1.258s coverage: 77.4% of statements
ok github.com/cloudflare/cfssl/ocsp 1.353s coverage: 75.1% of statements
ok github.com/cloudflare/cfssl/revoke 1.149s coverage: 75.0% of statements
ok github.com/cloudflare/cfssl/scan 1.023s coverage: 1.1% of statements
skipped github.com/cloudflare/cfssl/scan/crypto/md5
skipped github.com/cloudflare/cfssl/scan/crypto/rsa
skipped github.com/cloudflare/cfssl/scan/crypto/sha1
skipped github.com/cloudflare/cfssl/scan/crypto/sha256
skipped github.com/cloudflare/cfssl/scan/crypto/sha512
skipped github.com/cloudflare/cfssl/scan/crypto/tls
ok github.com/cloudflare/cfssl/selfsign 1.098s coverage: 70.0% of statements
ok github.com/cloudflare/cfssl/signer 1.020s coverage: 19.4% of statements
ok github.com/cloudflare/cfssl/signer/local 4.886s coverage: 77.9% of statements
ok github.com/cloudflare/cfssl/signer/remote 2.500s coverage: 70.0% of statements
ok github.com/cloudflare/cfssl/signer/universal 2.228s coverage: 67.7% of statements
ok github.com/cloudflare/cfssl/transport 1.012s
ok github.com/cloudflare/cfssl/transport/ca/localca 1.046s coverage: 94.9% of statements
ok github.com/cloudflare/cfssl/transport/kp 1.050s coverage: 37.1% of statements
ok github.com/cloudflare/cfssl/ubiquity 1.037s coverage: 88.3% of statements
ok github.com/cloudflare/cfssl/whitelist 3.519s coverage: 100.0% of statements
...
$ go test ./... (master✱)
ok golang.org/x/crypto/acme 2.782s
ok golang.org/x/crypto/acme/autocert 2.963s
? golang.org/x/crypto/acme/autocert/internal/acmetest [no test files]
ok golang.org/x/crypto/argon2 0.047s
ok golang.org/x/crypto/bcrypt 4.694s
ok golang.org/x/crypto/blake2b 0.056s
ok golang.org/x/crypto/blake2s 0.050s
ok golang.org/x/crypto/blowfish 0.015s
ok golang.org/x/crypto/bn256 0.460s
ok golang.org/x/crypto/cast5 4.204s
ok golang.org/x/crypto/chacha20poly1305 0.560s
ok golang.org/x/crypto/cryptobyte 0.014s
? golang.org/x/crypto/cryptobyte/asn1 [no test files]
ok golang.org/x/crypto/curve25519 0.025s
ok golang.org/x/crypto/ed25519 0.073s
? golang.org/x/crypto/ed25519/internal/edwards25519 [no test files]
ok golang.org/x/crypto/hkdf 0.012s
ok golang.org/x/crypto/internal/chacha20 0.047s
ok golang.org/x/crypto/internal/subtle 0.011s
ok golang.org/x/crypto/md4 0.013s
ok golang.org/x/crypto/nacl/auth 9.226s
ok golang.org/x/crypto/nacl/box 0.016s
ok golang.org/x/crypto/nacl/secretbox 0.012s
ok golang.org/x/crypto/nacl/sign 0.012s
ok golang.org/x/crypto/ocsp 0.047s
ok golang.org/x/crypto/openpgp 8.872s
ok golang.org/x/crypto/openpgp/armor 0.012s
ok golang.org/x/crypto/openpgp/clearsign 16.984s
ok golang.org/x/crypto/openpgp/elgamal 0.013s
? golang.org/x/crypto/openpgp/errors [no test files]
ok golang.org/x/crypto/openpgp/packet 0.159s
ok golang.org/x/crypto/openpgp/s2k 7.597s
ok golang.org/x/crypto/otr 0.612s
ok golang.org/x/crypto/pbkdf2 0.045s
ok golang.org/x/crypto/pkcs12 0.073s
ok golang.org/x/crypto/pkcs12/internal/rc2 0.013s
ok golang.org/x/crypto/poly1305 0.016s
ok golang.org/x/crypto/ripemd160 0.034s
ok golang.org/x/crypto/salsa20 0.013s
ok golang.org/x/crypto/salsa20/salsa 0.013s
ok golang.org/x/crypto/scrypt 0.942s
ok golang.org/x/crypto/sha3 0.140s
ok golang.org/x/crypto/ssh 0.939s
ok golang.org/x/crypto/ssh/agent 0.529s
ok golang.org/x/crypto/ssh/knownhosts 0.027s
ok golang.org/x/crypto/ssh/terminal 0.016s
ok golang.org/x/crypto/tea 0.010s
ok golang.org/x/crypto/twofish 0.019s
ok golang.org/x/crypto/xtea 0.012s
ok golang.org/x/crypto/xts 0.016s
```
* Re-vendor certificate-transparency-go to latest.
$ go test github.com/google/certificate-transparency-go{,/asn1,/client,/client/configpb,/jsonclient,/tls,/x509/pkix} golang.org/x/crypto/cryptobyte{,/asn1}
ok github.com/google/certificate-transparency-go 0.722s
ok github.com/google/certificate-transparency-go/asn1 0.011s
ok github.com/google/certificate-transparency-go/client 22.995s
? github.com/google/certificate-transparency-go/client/configpb [no test files]
ok github.com/google/certificate-transparency-go/jsonclient 0.020s
ok github.com/google/certificate-transparency-go/tls 0.096s
? github.com/google/certificate-transparency-go/x509/pkix [no test files]
ok golang.org/x/crypto/cryptobyte 0.013s
? golang.org/x/crypto/cryptobyte/asn1 [no test files]
* Bring in latest ct-go master.
dependabot[bot]
Aaron Gable
Samantha
Jacob Hoffman-Andrews
Roland Bracewell Shoemaker