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| 1 | +'use strict'; |
| 2 | +const common = require('../common'); |
| 3 | +if (!common.hasCrypto) |
| 4 | + common.skip('missing crypto'); |
| 5 | + |
| 6 | +// Tests the `mgf1Hash` option of crypto.publicEncrypt() and |
| 7 | +// crypto.privateDecrypt(), which allows the MGF1 digest of RSA-OAEP padding to |
| 8 | +// differ from the OAEP message digest (`oaepHash`). This is required for |
| 9 | +// interoperability with profiles such as XML Encryption's `rsa-oaep-mgf1p`, |
| 10 | +// where the OAEP digest may be changed but MGF1 is fixed to SHA-1. |
| 11 | + |
| 12 | +const assert = require('assert'); |
| 13 | +const crypto = require('crypto'); |
| 14 | +const fixtures = require('../common/fixtures'); |
| 15 | +const { hasFIPS } = require('../common/crypto'); |
| 16 | + |
| 17 | +const constants = crypto.constants; |
| 18 | + |
| 19 | +const publicKey = fixtures.readKey('rsa_public.pem', 'ascii'); |
| 20 | +const privateKey = fixtures.readKey('rsa_private.pem', 'ascii'); |
| 21 | + |
| 22 | +const input = Buffer.from('the quick brown fox jumps over the lazy dog'); |
| 23 | + |
| 24 | +// A round-trip with mismatched OAEP and MGF1 digests must succeed when both |
| 25 | +// sides agree on the digests. |
| 26 | +{ |
| 27 | + const encrypted = crypto.publicEncrypt({ |
| 28 | + key: publicKey, |
| 29 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 30 | + oaepHash: 'sha256', |
| 31 | + mgf1Hash: 'sha1', |
| 32 | + }, input); |
| 33 | + |
| 34 | + const decrypted = crypto.privateDecrypt({ |
| 35 | + key: privateKey, |
| 36 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 37 | + oaepHash: 'sha256', |
| 38 | + mgf1Hash: 'sha1', |
| 39 | + }, encrypted); |
| 40 | + |
| 41 | + assert.deepStrictEqual(decrypted, input); |
| 42 | +} |
| 43 | + |
| 44 | +// mgf1Hash actually affects the padding: a ciphertext produced with |
| 45 | +// oaepHash=sha256 and mgf1Hash=sha1 must NOT decrypt when MGF1 defaults to the |
| 46 | +// OAEP digest (sha256), which is the pre-existing behavior. |
| 47 | +{ |
| 48 | + const encrypted = crypto.publicEncrypt({ |
| 49 | + key: publicKey, |
| 50 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 51 | + oaepHash: 'sha256', |
| 52 | + mgf1Hash: 'sha1', |
| 53 | + }, input); |
| 54 | + |
| 55 | + assert.throws(() => { |
| 56 | + crypto.privateDecrypt({ |
| 57 | + key: privateKey, |
| 58 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 59 | + oaepHash: 'sha256', |
| 60 | + // No mgf1Hash: MGF1 follows oaepHash (sha256) and must fail to unpad. |
| 61 | + }, encrypted); |
| 62 | + }, { |
| 63 | + code: hasFIPS(3, 5) ? 'ERR_OSSL_EVP_PROVIDER_ASYM_CIPHER_FAILURE' : |
| 64 | + 'ERR_OSSL_RSA_OAEP_DECODING_ERROR' |
| 65 | + }); |
| 66 | +} |
| 67 | + |
| 68 | +// Backward compatibility: omitting mgf1Hash on both sides keeps MGF1 == oaepHash |
| 69 | +// (the historical behavior), so this round-trips, and setting mgf1Hash equal to |
| 70 | +// oaepHash is equivalent to omitting it. |
| 71 | +{ |
| 72 | + const encrypted = crypto.publicEncrypt({ |
| 73 | + key: publicKey, |
| 74 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 75 | + oaepHash: 'sha256', |
| 76 | + }, input); |
| 77 | + |
| 78 | + const decrypted = crypto.privateDecrypt({ |
| 79 | + key: privateKey, |
| 80 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 81 | + oaepHash: 'sha256', |
| 82 | + mgf1Hash: 'sha256', |
| 83 | + }, encrypted); |
| 84 | + |
| 85 | + assert.deepStrictEqual(decrypted, input); |
| 86 | +} |
| 87 | + |
| 88 | +// The default oaepHash is sha1, so mgf1Hash defaults to sha1 as well. A |
| 89 | +// ciphertext encrypted with all defaults must decrypt with an explicit |
| 90 | +// mgf1Hash: 'sha1'. |
| 91 | +{ |
| 92 | + const encrypted = crypto.publicEncrypt({ |
| 93 | + key: publicKey, |
| 94 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 95 | + }, input); |
| 96 | + |
| 97 | + const decrypted = crypto.privateDecrypt({ |
| 98 | + key: privateKey, |
| 99 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 100 | + mgf1Hash: 'sha1', |
| 101 | + }, encrypted); |
| 102 | + |
| 103 | + assert.deepStrictEqual(decrypted, input); |
| 104 | +} |
| 105 | + |
| 106 | +// A few other digest combinations round-trip. |
| 107 | +for (const [oaepHash, mgf1Hash] of [ |
| 108 | + ['sha512', 'sha1'], |
| 109 | + ['sha384', 'sha256'], |
| 110 | + ['sha1', 'sha256'], |
| 111 | +]) { |
| 112 | + const encrypted = crypto.publicEncrypt({ |
| 113 | + key: publicKey, |
| 114 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 115 | + oaepHash, |
| 116 | + mgf1Hash, |
| 117 | + }, input); |
| 118 | + |
| 119 | + const decrypted = crypto.privateDecrypt({ |
| 120 | + key: privateKey, |
| 121 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 122 | + oaepHash, |
| 123 | + mgf1Hash, |
| 124 | + }, encrypted); |
| 125 | + |
| 126 | + assert.deepStrictEqual(decrypted, input); |
| 127 | +} |
| 128 | + |
| 129 | +// mgf1Hash must be a string. |
| 130 | +for (const mgf1Hash of [1, true, {}, [], null]) { |
| 131 | + assert.throws(() => { |
| 132 | + crypto.publicEncrypt({ |
| 133 | + key: publicKey, |
| 134 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 135 | + oaepHash: 'sha256', |
| 136 | + mgf1Hash, |
| 137 | + }, input); |
| 138 | + }, { code: 'ERR_INVALID_ARG_TYPE' }); |
| 139 | +} |
| 140 | + |
| 141 | +// An unknown mgf1Hash digest name is rejected. |
| 142 | +assert.throws(() => { |
| 143 | + crypto.publicEncrypt({ |
| 144 | + key: publicKey, |
| 145 | + padding: constants.RSA_PKCS1_OAEP_PADDING, |
| 146 | + oaepHash: 'sha256', |
| 147 | + mgf1Hash: 'not-a-real-digest', |
| 148 | + }, input); |
| 149 | +}, { code: 'ERR_OSSL_EVP_INVALID_DIGEST' }); |
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