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Support for HMAC Precomputed Key (only for non-FIPS builds)
This commit adds support for HMAC Precomputed Keys in ACCP. See aws/aws-lc#1574
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Fabrice Benhamouda
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Aug 28, 2024
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Submodule aws-lc
updated
from 057477 to 2f1879
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37 changes: 37 additions & 0 deletions
37
examples/gradle-kt-dsl/lib/src/test/kotlin/com/amazon/corretto/crypto/examples/Hmac.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| package com.amazon.corretto.crypto.examples | ||
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| import com.amazon.corretto.crypto.provider.AmazonCorrettoCryptoProvider | ||
| import java.util.* | ||
| import javax.crypto.Mac | ||
| import javax.crypto.spec.SecretKeySpec | ||
| import kotlin.test.Test | ||
| import kotlin.test.assertContentEquals | ||
| import kotlin.test.assertEquals | ||
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| class Hmac { | ||
| @Test | ||
| fun hmacTest() { | ||
| val accpProviderName = "AmazonCorrettoCryptoProvider" | ||
| AmazonCorrettoCryptoProvider.install() | ||
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| val mac = Mac.getInstance("HmacSHA384") | ||
| assertEquals(accpProviderName, mac.provider.name) | ||
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| // An arbitrary 32-bytes key in base64 for the example | ||
| val keyBase64 = "62lKZjLXnX4yGvNyd3/M3q+T6yfREHgbIoJidXCEzGw=" | ||
| val key = Base64.getDecoder().decode(keyBase64) | ||
| val keySpec = SecretKeySpec(key, "Generic") | ||
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| val message = "Hello, this is just an example." | ||
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| // Compute the MAC | ||
| mac.init(keySpec); | ||
| val macResult = mac.doFinal(message.toByteArray()) | ||
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| // Verify the result matches what we expect | ||
| val expectedResultBase64 = | ||
| "w72DBgWvjTDqlv+EzOc1/R+K9Qq1jrNCHCQewXXhaOQ8Joi2jPPQdAT+HDc65KMM" | ||
| val expectedResult = Base64.getDecoder().decode(expectedResultBase64) | ||
| assertContentEquals(expectedResult, macResult) | ||
| } | ||
| } |
53 changes: 53 additions & 0 deletions
53
...-kt-dsl/lib/src/test/kotlin/com/amazon/corretto/crypto/examples/HmacWithPrecomputedKey.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package com.amazon.corretto.crypto.examples | ||
|
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| import com.amazon.corretto.crypto.provider.AmazonCorrettoCryptoProvider | ||
| import java.security.SecureRandom | ||
| import java.util.* | ||
| import javax.crypto.Cipher | ||
| import javax.crypto.Mac | ||
| import javax.crypto.SecretKeyFactory | ||
| import javax.crypto.spec.GCMParameterSpec | ||
| import javax.crypto.spec.SecretKeySpec | ||
| import kotlin.test.Test | ||
| import kotlin.test.assertContentEquals | ||
| import kotlin.test.assertEquals | ||
|
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| class HmacWithPrecomputedKey { | ||
| @Test | ||
| fun hmacWithPrecomputedKeyTest() { | ||
| // EXPERT-ONLY use | ||
| // This example is most likely NOT what you want to use. | ||
| // If you need to use Hmac, see the Hmac.kt example. | ||
| // This example shows how to use precomputed keys, which is not standard in JCA/JCE. | ||
| // See ACCP README.md for details. | ||
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| val accpProviderName = "AmazonCorrettoCryptoProvider" | ||
| AmazonCorrettoCryptoProvider.install() | ||
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| val mac = Mac.getInstance("HmacSHA384WithPrecomputedKey") | ||
| assertEquals(accpProviderName, mac.provider.name) | ||
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| val skf = SecretKeyFactory.getInstance("HmacSHA384WithPrecomputedKey") | ||
| assertEquals(accpProviderName, skf.provider.name) | ||
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| // An arbitrary 32-bytes key in base64 for the example | ||
| val keyBase64 = "62lKZjLXnX4yGvNyd3/M3q+T6yfREHgbIoJidXCEzGw="; | ||
| val key = Base64.getDecoder().decode(keyBase64); | ||
| val keySpec = SecretKeySpec(key, "Generic"); | ||
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| val message = "Hello, this is just an example." | ||
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| // Compute the HMAC precomputed key | ||
| val precomputedKey = skf.generateSecret(keySpec) | ||
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| // Compute the HMAC using the precomputed key | ||
| mac.init(precomputedKey); | ||
| val macResult = mac.doFinal(message.toByteArray()) | ||
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| // Verify the result matches what we expect | ||
| val expectedResultBase64 = | ||
| "w72DBgWvjTDqlv+EzOc1/R+K9Qq1jrNCHCQewXXhaOQ8Joi2jPPQdAT+HDc65KMM" | ||
| val expectedResult = Base64.getDecoder().decode(expectedResultBase64) | ||
| assertContentEquals(expectedResult, macResult) | ||
| } | ||
| } |
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