PEM and DER keys import test vectors

### Problem

Currently the SDKs are not compatible with ECDSA keys generated by OpenSSL. This can be confusing for users that reuse their keys on different chains and have used OpenSSL to generate their keys.

### Solution

We need to support importing both the current and the OpenSSL versions keys. We provide test vectors for checking if the implementation is correct:
# Test vector for ED25519 private key

## PEM import

### Test unencrypted PEM private key

PEM:

```markdown
-----BEGIN PRIVATE KEY-----
MC4CAQAwBQYDK2VwBCIEIOgbjaHgEqF7PY0t2dUf2VU0u1MRoKii/fywDlze4lvl
-----END PRIVATE KEY-----
```

Private key: `e81b8da1e012a17b3d8d2dd9d51fd95534bb5311a0a8a2fdfcb00e5cdee25be5`

Public key: `f7b9aa4a8e4eee94e4277dfe757d8d7cde027e7cd5349b7d8e6ee21c9b9395be`

### Test encrypted PEM private key

Encrypted PEM:

```markdown
-----BEGIN ENCRYPTED PRIVATE KEY-----
MIGbMFcGCSqGSIb3DQEFDTBKMCkGCSqGSIb3DQEFDDAcBAiho4GvPxvL6wICCAAw
DAYIKoZIhvcNAgkFADAdBglghkgBZQMEAQIEEIdsubXR0QvxXGSprqDuDXwEQJZl
OBtwm2p2P7WrWE0OnjGxUe24fWwdrvJUuguFtH3FVWc8C5Jbxgbyxsuzbf+utNL6
0ey+WdbGL06Bw0HGqs8=
-----END ENCRYPTED PRIVATE KEY-----
```

Passphrase: `asdasd123`

Private key: `fa0857e963946d5f5e035684c40354d3cd3dcc80c0fb77beac2ef7c4b5271599`

Public key: `202af61e141465d4bf2c356d37d18bd026c246bde4eb73258722ad11f790be4e`

## DER import

### Test OpenSSL DER private key

Private key DER:

```markdown
302e020100300506032b657004220420feb858a4a69600a5eef2d9c76f7fb84fc0b6627f29e0ab17e160f640c267d404
```

Private key: `feb858a4a69600a5eef2d9c76f7fb84fc0b6627f29e0ab17e160f640c267d404`

Public key: `8ccd31b53d1835b467aac795dab19b274dd3b37e3daf12fcec6bc02bac87b53d`

### Test OpenSSL DER public key

Public key DER:

```markdown
302a300506032b65700321008ccd31b53d1835b467aac795dab19b274dd3b37e3daf12fcec6bc02bac87b53d
```

Public key: `8ccd31b53d1835b467aac795dab19b274dd3b37e3daf12fcec6bc02bac87b53d`

# Test vector for ECDSA private key

## PEM import

### Test unencrypted uncompressed PEM

PEM:

```markdown
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIG8I+jKi+iGVa7ttbfnlnML5AdvPugbgBWnseYjrle6qoAcGBSuBBAAK
oUQDQgAEqf5BmMeBzkU1Ra9UAbZJo3tytVOlb7erTc36LRLP20mOLU7+mFY+3Cfe
fAZgBtPXRAmDtRvYGODswAalW85GKA==
-----END EC PRIVATE KEY-----
```

Private key: `6f08fa32a2fa21956bbb6d6df9e59cc2f901dbcfba06e00569ec7988eb95eeaa`

Public key: `02a9fe4198c781ce453545af5401b649a37b72b553a56fb7ab4dcdfa2d12cfdb49`

### Test unencrypted compressed PEM

PEM:

```markdown
-----BEGIN EC PRIVATE KEY-----
MFQCAQEEIOHyhclwHbha3f281Kvd884rhBzltxGJxCZyaQCagH9joAcGBSuBBAAK
oSQDIgACREr6gFZa4K7hBP+bA25VdgQ+0ABFgM+g5RYw/W6T1Og=
-----END EC PRIVATE KEY-----
```

Private key: `e1f285c9701db85addfdbcd4abddf3ce2b841ce5b71189c4267269009a807f63`

Public key: `02444afa80565ae0aee104ff9b036e5576043ed0004580cfa0e51630fd6e93d4e8`

### Test encrypted uncompressed PEM

Encrypted PEM:

```markdown
-----BEGIN EC PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,0046A9EED8D16F0CAA66A197CE8BE8BD

9VU9gReUmrn4XywjMx0F0A3oGzpHIksEXma72TCSdcxI7zHy0mtzuGq4Wd25O38s
H9c6kvhTPS1N/c6iNhx154B0HUoND8jvAvfxbGR/R87vpZJsOoKCmRxGqrxG8HER
FIHQ1jy16DrAbU95kDyLsiF1dy2vUY/HoqFZwxl/IVc=
-----END EC PRIVATE KEY-----
```

Passphrase: `asdasd123`

Private key: `cf49eb5206c1b0468854d6ea7b370590619625514f71ff93608a18465e4012ad`

Public key: `025f0d14a7562d6319e5b8f91620d2ce9ad13d9abf21cfe9bd0a092c0f35bf1701`

### Test encrypted compressed PEM

Encrypted PEM:

```markdown
-----BEGIN EC PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,4A9B3B987EC2EFFA405818327D14FFF7

Wh756RkK5fn1Ke2denR1OYfqE9Kr4BXhgrEMTU/6o0SNhMULUhWGHrCWvmNeEQwp
ZVZYUxgYoTlJBeREzKAZithcvxIcTbQfLABo1NZbjA6YKqAqlGpM6owwL/f9e2ST
-----END EC PRIVATE KEY-----
```

Passphrase: `asdasd123`

Private key: `c0d3e16ba5a1abbeac4cd327a3c3c1cc10438431d0bac019054e573e67768bb5`

Public key: `02065f736378134c53c7a2ee46f199fb93b9b32337be4e95660677046476995544`

## DER import

### Test legacy DER private key

Private key DER:

```markdown
3030020100300706052b8104000a042204208c2cdc9575fe67493443967d74958fd7808a3787fd3337e99cfeebbc7566b586
```

Private key: `8c2cdc9575fe67493443967d74958fd7808a3787fd3337e99cfeebbc7566b586`

Public key: `028173079d2e996ef6b2d064fc82d5fc7094367211e28422bec50a2f75c365f5fd`

### Test legacy DER public key

Public key DER:

```markdown
302d300706052b8104000a032200028173079d2e996ef6b2d064fc82d5fc7094367211e28422bec50a2f75c365f5fd
```

Public key: `028173079d2e996ef6b2d064fc82d5fc7094367211e28422bec50a2f75c365f5fd`

### Test OpenSSL compatible compressed DER private key

Private key DER:

```markdown
30540201010420ac318ea8ff8d991ab2f16172b4738e74dc35a56681199cfb1c0cb2e7cb560ffda00706052b8104000aa124032200036843f5cb338bbb4cdb21b0da4ea739d910951d6e8a5f703d313efe31afe788f4
```

Private key: `ac318ea8ff8d991ab2f16172b4738e74dc35a56681199cfb1c0cb2e7cb560ffd`

Public key: `036843f5cb338bbb4cdb21b0da4ea739d910951d6e8a5f703d313efe31afe788f4`

### Test OpenSSL compatible compressed DER public key

Public key DER:

```markdown
3036301006072a8648ce3d020106052b8104000a032200036843f5cb338bbb4cdb21b0da4ea739d910951d6e8a5f703d313efe31afe788f4
```

Public key: `036843f5cb338bbb4cdb21b0da4ea739d910951d6e8a5f703d313efe31afe788f4`

### Test OpenSSL compatible uncompressed DER private key

Private key DER:

```markdown
307402010104208927647ad12b29646a1d051da8453462937bb2c813c6815cac6c0b720526ffc6a00706052b8104000aa14403420004aaac1c3ac1bea0245b8e00ce1e2018f9eab61b6331fbef7266f2287750a6597795f855ddcad2377e22259d1fcb4e0f1d35e8f2056300c15070bcbfce3759cc9d
```

Private key: `8927647ad12b29646a1d051da8453462937bb2c813c6815cac6c0b720526ffc6`

Public key: `03aaac1c3ac1bea0245b8e00ce1e2018f9eab61b6331fbef7266f2287750a65977`

### Test OpenSSL compatible uncompressed DER public key

Public key DER:

```markdown
3056301006072a8648ce3d020106052b8104000a03420004aaac1c3ac1bea0245b8e00ce1e2018f9eab61b6331fbef7266f2287750a6597795f855ddcad2377e22259d1fcb4e0f1d35e8f2056300c15070bcbfce3759cc9d
```

Public key: `03aaac1c3ac1bea0245b8e00ce1e2018f9eab61b6331fbef7266f2287750a65977`

### Test OpenSSL compatible DER private key without public key

Private key DER:

```markdown
302e0201010420a6170a6aa6389a5bd3a3a8f9375f57bd91aa7f7d8b8b46ce0b702e000a21a5fea00706052b8104000a
```

Private key: `a6170a6aa6389a5bd3a3a8f9375f57bd91aa7f7d8b8b46ce0b702e000a21a5fe`

Public key: `03b69a75a5ddb1c0747e995d47555019e5d8a28003ab5202bd92f534361fb4ec8a`

### Alternatives

_No response_