diff --git a/Package.swift b/Package.swift
index 3a76cf2ed16..1e5dd4360a3 100644
--- a/Package.swift
+++ b/Package.swift
@@ -75,7 +75,7 @@ let package = Package(
         ),
         .target(
             name: "AWSSDKHTTPAuth",
-            dependencies: [.crt, .clientRuntime, .smithyChecksumsAPI, "AWSSDKIdentity"],
+            dependencies: [.crt, .clientRuntime, "AWSSDKIdentity"],
             path: "./Sources/Core/AWSSDKHTTPAuth"
         ),
         .target(
diff --git a/Sources/Core/AWSSDKHTTPAuth/AWSSigV4Signer.swift b/Sources/Core/AWSSDKHTTPAuth/AWSSigV4Signer.swift
index 3bd85651ef2..be5f5ad16f5 100644
--- a/Sources/Core/AWSSDKHTTPAuth/AWSSigV4Signer.swift
+++ b/Sources/Core/AWSSDKHTTPAuth/AWSSigV4Signer.swift
@@ -9,7 +9,6 @@ import Smithy
 import SmithyIdentityAPI
 import SmithyHTTPAPI
 import SmithyHTTPAuthAPI
-import SmithyChecksumsAPI
 import AwsCommonRuntimeKit
 import ClientRuntime
 import Foundation
@@ -68,7 +67,7 @@ public class AWSSigV4Signer: SmithyHTTPAuthAPI.Signer {
                 signingConfig: crtSigningConfig,
                 signature: requestSignature,
                 trailingHeaders: unsignedRequest.trailingHeaders,
-                checksumAlgorithm: signingProperties.get(key: SigningPropertyKeys.checksum)
+                checksumString: signingProperties.get(key: SigningPropertyKeys.checksum)
             )
         }
 
@@ -105,11 +104,11 @@ public class AWSSigV4Signer: SmithyHTTPAuthAPI.Signer {
         let signedBodyHeader: AWSSignedBodyHeader = signingProperties.get(key: SigningPropertyKeys.signedBodyHeader) ?? .none
 
         // Determine signed body value
-        let checksum = signingProperties.get(key: SigningPropertyKeys.checksum)
+        let checksumIsPresent = signingProperties.get(key: SigningPropertyKeys.checksum) != nil
         let isChunkedEligibleStream = signingProperties.get(key: SigningPropertyKeys.isChunkedEligibleStream) ?? false
 
         let signedBodyValue: AWSSignedBodyValue = determineSignedBodyValue(
-            checksum: checksum,
+            checksumIsPresent: checksumIsPresent,
             isChunkedEligbleStream: isChunkedEligibleStream,
             isUnsignedBody: unsignedBody
         )
@@ -218,7 +217,7 @@ public class AWSSigV4Signer: SmithyHTTPAuthAPI.Signer {
     }
 
     private func determineSignedBodyValue(
-        checksum: ChecksumAlgorithm?,
+        checksumIsPresent: Bool,
         isChunkedEligbleStream: Bool,
         isUnsignedBody: Bool
     ) -> AWSSignedBodyValue {
@@ -228,7 +227,7 @@ public class AWSSigV4Signer: SmithyHTTPAuthAPI.Signer {
         }
 
         // streaming + eligible for chunked transfer
-        if checksum == nil {
+        if !checksumIsPresent {
             return isUnsignedBody ? .unsignedPayload : .streamingSha256Payload
         } else {
             // checksum is present
diff --git a/Sources/Core/AWSSDKHTTPAuth/SigV4AuthScheme.swift b/Sources/Core/AWSSDKHTTPAuth/SigV4AuthScheme.swift
index c0cd83f046d..d7c1396f0b7 100644
--- a/Sources/Core/AWSSDKHTTPAuth/SigV4AuthScheme.swift
+++ b/Sources/Core/AWSSDKHTTPAuth/SigV4AuthScheme.swift
@@ -58,7 +58,7 @@ public struct SigV4AuthScheme: AuthScheme {
         updatedSigningProperties.set(key: SigningPropertyKeys.omitSessionToken, value: false)
 
         // Copy checksum from middleware context to signing properties
-        updatedSigningProperties.set(key: SigningPropertyKeys.checksum, value: context.checksum)
+        updatedSigningProperties.set(key: SigningPropertyKeys.checksum, value: context.checksumString)
 
         // Copy chunked streaming eligiblity from middleware context to signing properties
         updatedSigningProperties.set(
diff --git a/Sources/Core/AWSSDKHTTPAuth/SigningPropertyKeys.swift b/Sources/Core/AWSSDKHTTPAuth/SigningPropertyKeys.swift
index bace32b6317..ee3a21295c9 100644
--- a/Sources/Core/AWSSDKHTTPAuth/SigningPropertyKeys.swift
+++ b/Sources/Core/AWSSDKHTTPAuth/SigningPropertyKeys.swift
@@ -7,7 +7,6 @@
 
 import Smithy
 import SmithyHTTPAuthAPI
-import SmithyChecksumsAPI
 import struct Foundation.TimeInterval
 
 public extension SigningPropertyKeys {
@@ -21,6 +20,6 @@ public extension SigningPropertyKeys {
     static let signatureType = AttributeKey<AWSSignatureType>(name: "SignatureType")
     static let bidirectionalStreaming = AttributeKey<Bool>(name: "BidirectionalStreaming")
     static let expiration = AttributeKey<TimeInterval>(name: "Expiration")
-    static let checksum = AttributeKey<ChecksumAlgorithm>(name: "checksum")
+    static let checksum = AttributeKey<String>(name: "checksum")
     static let isChunkedEligibleStream = AttributeKey<Bool>(name: "isChunkedEligibleStream")
 }