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doc: use secure key length for HMAC generateKey - #48052
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The examples for generateKey() and generateKeySync() generate 64-bit HMAC keys. That is inadequate for virtually any HMAC instance. As per common NIST recommendations, the minimum should be roughly 112 bits, or more commonly 128 bits. Due to the design of HMAC itself, it is not unreasonable to choose the underlying hash function's block size as the key length. For many popular hash functions (SHA-256, SHA-224, SHA-1, MD5, ...) this happens to be 64 bytes (bytes, not bits!). This is consistent with the HMAC implementation in .NET, for example, even though it provides virtually no benefit over a 256-bit key.
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tniessen added a commit
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May 22, 2023
Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: nodejs#48052 Refs: nodejs#37248
nodejs-github-bot pushed a commit
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Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: #48052 Refs: #37248 PR-URL: #48121 Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
targos pushed a commit
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May 30, 2023
The examples for generateKey() and generateKeySync() generate 64-bit HMAC keys. That is inadequate for virtually any HMAC instance. As per common NIST recommendations, the minimum should be roughly 112 bits, or more commonly 128 bits. Due to the design of HMAC itself, it is not unreasonable to choose the underlying hash function's block size as the key length. For many popular hash functions (SHA-256, SHA-224, SHA-1, MD5, ...) this happens to be 64 bytes (bytes, not bits!). This is consistent with the HMAC implementation in .NET, for example, even though it provides virtually no benefit over a 256-bit key. PR-URL: #48052 Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
targos pushed a commit
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May 30, 2023
Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: #48052 Refs: #37248 PR-URL: #48121 Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
danielleadams pushed a commit
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Jul 6, 2023
The examples for generateKey() and generateKeySync() generate 64-bit HMAC keys. That is inadequate for virtually any HMAC instance. As per common NIST recommendations, the minimum should be roughly 112 bits, or more commonly 128 bits. Due to the design of HMAC itself, it is not unreasonable to choose the underlying hash function's block size as the key length. For many popular hash functions (SHA-256, SHA-224, SHA-1, MD5, ...) this happens to be 64 bytes (bytes, not bits!). This is consistent with the HMAC implementation in .NET, for example, even though it provides virtually no benefit over a 256-bit key. PR-URL: #48052 Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
danielleadams pushed a commit
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Jul 6, 2023
Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: #48052 Refs: #37248 PR-URL: #48121 Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
MoLow pushed a commit
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Jul 6, 2023
The examples for generateKey() and generateKeySync() generate 64-bit HMAC keys. That is inadequate for virtually any HMAC instance. As per common NIST recommendations, the minimum should be roughly 112 bits, or more commonly 128 bits. Due to the design of HMAC itself, it is not unreasonable to choose the underlying hash function's block size as the key length. For many popular hash functions (SHA-256, SHA-224, SHA-1, MD5, ...) this happens to be 64 bytes (bytes, not bits!). This is consistent with the HMAC implementation in .NET, for example, even though it provides virtually no benefit over a 256-bit key. PR-URL: nodejs#48052 Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
MoLow pushed a commit
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Jul 6, 2023
Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: nodejs#48052 Refs: nodejs#37248 PR-URL: nodejs#48121 Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Ceres6 pushed a commit
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Aug 14, 2023
Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: nodejs#48052 Refs: nodejs#37248 PR-URL: nodejs#48121 Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Ceres6 pushed a commit
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Aug 14, 2023
Add a reference to potential problems with using strings as HMAC keys. Also advise against exceeding the underlying hash function's block size when generating HMAC keys from a cryptographically secure source of entropy. Refs: nodejs#48052 Refs: nodejs#37248 PR-URL: nodejs#48121 Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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The examples for
generateKey()andgenerateKeySync()generate 64-bit HMAC keys. That is inadequate for virtually any HMAC instance. As per common NIST recommendations, the minimum should be roughly 112 bits, or more commonly 128 bits.Due to the design of HMAC itself, it is not unreasonable to choose the underlying hash function's block size as the key length. For many popular hash functions (SHA-256, SHA-224, SHA-1, MD5, ...) this happens to be 64 bytes (bytes, not bits!). This is consistent with the HMAC implementation in .NET, for example, even though it provides virtually no benefit over a 256-bit key.